Granfort Buying Comparison Guide

Granfort 370 GTX vs Sea Ray Sundancer 370 OB

What buyers need to know.

The Sea Ray Sundancer 370 Outboard is a flagship-class cruiser: 39 ft 9 in long, 21,008 lb, standard integrated hardtop, triple 300 HP Verado, 7.5kW generator, dual 12 in Simrad, and a technology package that rivals a small yacht — at approximately $950K to $1.03M. The Granfort 370 GTX answers with 7,508 lb less weight with engines, $500K+ less to buy, the same 50 mph top speed on 800 HP, ABYC and USCG certification, and a 10-year structural warranty.

~$500K

Granfort savings vs Sea Ray 370 OB entry

7,508lb

Granfort lighter with engines · same 50 mph

50mph

Granfort published · 800 HP on 13,500 lb

10yr

Structural warranty · hull + deck

ABYC

+ U.S. Coast Guard certified · Granfort

Reader framing

Before choosing between these two boats, understand the real decision.

Sea Ray gives buyers a larger luxury-cruiser platform, advanced amenities, integrated technology, and the confidence of an established national brand.

Granfort gives buyers a dramatically lighter, more open sport-cruiser experience with a much lower entry price and a stronger value-focused ownership proposition.

The Sea Ray Sundancer 370 Outboard is a substantially larger luxury cruiser: 39 ft 9 in overall, with a 12 ft beam, 250 gallons of fuel capacity, triple 300 HP Mercury Verado outboards, and accommodation for four overnight guests. It is designed around multiple social areas, upscale amenities and next-generation technology, making it a refined choice for buyers who prioritize comfort, luxury and a premium cruising experience.

The Granfort 370 GTX represents a different value equation. It delivers a 37-foot sport-cruiser platform with a more open-air personality and significantly less weight. The buyer is not simply choosing between two similarly priced boats—the decision is whether the Sea Ray’s additional size, luxury equipment and premium brand experience justify its substantially higher investment.

Before comparing features one by one, it is important to understand the real decision. These boats serve overlapping missions, but they approach ownership from very different directions. The Sea Ray Sundancer 370 Outboard is the larger, heavier and more comprehensively equipped luxury cruiser, while the Granfort 370 GTX emphasizes a lighter platform, open-air sport-cruising and a lower entry point.

For buyers considering the Sea Ray Sundancer 370 Outboard, the key question is simple: how much additional value do the Sea Ray’s larger dimensions, luxury amenities and technology provide for your particular boating lifestyle? If those features are central to your ownership experience, the Sea Ray makes a compelling case. If open-air boating, lower weight and overall value matter more, the Granfort 370 GTX becomes a serious alternative.

Click here : Real test data. Two boats. One slider. See how they compare at every RPM — from idle to wide open throttle.

Buyer education first

These are two different boats in two different price categories. Understanding why they are being compared is the starting point.

Buyers comparing the Granfort 370 GTX and the Sea Ray Sundancer 370 Outboard are asking: is the Sea Ray premium justified — or can a $440K–$550K outboard cruiser deliver the same mission for half the money?

The Sea Ray Sundancer 370 OB is a flagship-class cruiser. At 39 ft 9 in LOA, 21,008 lb, standard integrated hardtop, dual 12 in Simrad, 7.5kW generator standard, and a Brunswick technology package — it is genuinely in a different size and price category.

The Granfort 370 GTX delivers the 37-foot outboard cruising mission at roughly half the price — 7,508 lb lighter with engines, ABYC and U.S. Coast Guard certified, backed by a 10-year structural warranty, and starting from $439,900. BoatTEST confirmed both boats reach 50+ mph — but Granfort gets there on 800 HP versus Sea Ray’s 900 HP, and burns ~13.2 GPH at cruise versus the Sea Ray’s 42.8 GPH.

Simple buying question: if your budget reaches the Sea Ray 370 OB and you want the larger flagship platform — it is the right choice. If your budget is $440K–$550K and you want the strongest performance and value at that price — the Granfort wins the comparison decisively on data.

Photo Comparison

370 GTX

Sundancer

Where Granfort wins

7,508 lb lighter with engines. Over $500K less. The same top speed.

BoatTEST recorded the Sea Ray 370 OB at 21,008 lb and 50.8 mph WOT on triple 300 HP Verados (900 HP). The Granfort 370 GTX publishes 50 mph on twin 400 HP V10s (800 HP) from 13,500 lb with engines. Same destination speed — 100 fewer horsepower, 7,508 fewer pounds.

The fuel efficiency gap is even more significant: Granfort burns approximately 13.2 GPH at cruise. BoatTEST recorded the Sea Ray 370 OB at 42.8 GPH at its best cruise speed — 3.2× more fuel per hour. Over a full season of regular weekend use, that difference compounds into thousands of dollars in fuel cost alone.

The real advantage is how it feels on the water: The social cockpit invites guests to stay. The stern feels like a large balcony over the water. The grill table, bar-style stools, and convertible lounge make the aft deck a genuine social destination. And the dry shower layout means a weekend aboard is actually comfortable — not a compromise.

$439,900vs ~$950K Sea Ray 370 OB entry

~13.2 GPHGranfort cruise vs 42.8 GPH Sea Ray

Same speed50 mph on 100 HP less

What Sea Ray 370 OB does well

Flagship luxury, 39 ft 9 in LOA, and a technology package that rivals a small yacht.

Power & Motoryacht called the Sea Ray 370 OB the most well-thought-out boat they had seen. BoatTEST recorded 50.8 mph on triple 300 HP Verados. Standard equipment includes an integrated hardtop, dual 12 in Simrad chartplotters, a 7.5kW generator, U-shaped cockpit for eight, 32 in cockpit TV, wet bar with grill, and optional Seakeeper gyrostabilizer.

At 39 ft 9 in LOA and 12 ft beam, it is genuinely in a different size category. For buyers whose budget comfortably reaches $950K–$1M and whose mission demands that level of luxury — the Sea Ray earns every dollar.

39 ft 9 inLOA — 2 ft 9 in longer than Granfort

7.5kWGenerator standard · with TV and wet bar

50.8 mphBoatTEST confirmed · triple 300 HP

Published performance test data

Head-to-head published test data — the numbers that prove the Granfort efficiency advantage.

BoatTEST.com conducted a full sea trial of the Sea Ray 370 OB in 2021. The Granfort sea trial was published on granfortboats.us in April 2025. The two tests side by side tell the complete performance story.

Granfort 370 GTX

Granfort 370 GTX · published sea trial

Weight with engines	13,500 lb
Engines	2×400 HP Mercury V10
Top speed	50 mph
0 to plane	7.5 seconds
Cruise fuel burn	~13.2 GPH
Fuel efficiency	~2.2 MPG est.
HP to weight	16.9 lb per HP

Source: granfortboats.us/granfort-370-gtx-sea-trial/ · April 2025

Sea Ray Sundancer 370 OB

Published weight (BoatTEST)	21,008 lb
Test weight (70% fuel+3 crew)	22,947 lb
Engines tested	3×300 HP Mercury Verado
Top speed @ 5,900 RPM	50.8 mph
0 to plane	5.7 seconds
Best cruise @ 4,500 RPM	38.2 mph
Cruise fuel burn	42.8 GPH
Cruise efficiency	0.9 MPG / 201 mi range
HP to weight	23.3 lb per HP

Source: BoatTEST.com full sea trial 2021 · test weight 22,947 lb · triple 300 HP Mercury Verado

What the data tells you: Both boats reach 50+ mph. The Sea Ray achieves 50.8 mph on 900 HP from 21,008 lb. The Granfort achieves 50 mph on 800 HP from 13,500 lb with engines. The Sea Ray burns 42.8 GPH at 38.2 mph cruise. The Granfort burns approximately 13.2 GPH — a 3.2× fuel efficiency advantage. Over a full season that gap represents thousands of dollars in operating cost savings.

Granfort 370 GTX

Granfort — rising as the next luxury icon in the U.S.

Those ahead of the curve choose it.

01 Crafted with precision, backed by a 10-year structural warranty.

Porsche Consulting-advised production processes. ABYC and U.S. Coast Guard certified. Hull and deck covered from day one — every claim is in writing.

02 U.S.-certified, reliable, and built for discerning owners.

Fibrafort. 35 years. 18,000+ boats. 44 countries. The builder behind Granfort is not a startup — it is South America’s largest boat manufacturer by units produced.

03 Book your personal test and experience Granfort firsthand.

Private showings and sea trials available in Florida. One run on the water and the conversation changes.

The builder behind Granfort

Fibrafort — South America's largest boat manufacturer. 35 years. 18,000+ boats. 44 countries.

Granfort is the U.S. export brand of Fibrafort — the largest boat manufacturer in South America by units produced. Understanding the factory behind the name is part of understanding what gives the Granfort its ownership confidence story.

Fibrafort was founded in Brazil in 1990 and has built over 18,000 boats across more than three decades, exporting to customers in 44 countries. It is not a boutique builder. It is a high-volume, internationally certified manufacturer with a decades-long track record. The Granfort 370 GTX is built in that factory — to ABYC and U.S. Coast Guard standards, with Porsche Consulting-advised production processes embedded throughout.

35+

Granfort savings vs Sea Ray 370 OB entry

18,000+

Boats delivered globally

44

Countries worldwide

#1

Largest in South America by units

Manufacturing pedigree

Porsche Consulting-advised production processes. Measurable results. No other builder in this class can say this.

Fibrafort engaged Porsche Consulting not to style a boat or attach a luxury name to the product, but to improve how its boats are developed, planned, produced, and delivered. The work focused on operational excellence: development processes, production flow, logistics, material and cost planning, purchasing, storage, and lean manufacturing practices.

The results were published and measurable: material costs reduced by 10%, extra daily parts orders cut by 90%, reject rate reduced from 28 items to 19, and overtime reduced by 48%. For Granfort buyers, this means the brand is backed by a manufacturing culture shaped by lean thinking, process discipline, quality improvement, and continuous operational refinement.

Fibrafort + Porsche Consulting · Operational excellence

Porsche Consulting-advised production processes — measurable results

Material costs reduced 10% · parts orders cut 90% · reject rate reduced · overtime down 48%. Better process control supports more consistent production, fewer delays, stronger quality discipline, and a more reliable ownership experience.

ABYC + U.S. Coast Guard Certified · 10-Year Structural Warranty · Fibrafort / 35+ Years / 18,000+ Boats

Lifestyle decision

Sea Ray's flagship luxury ecosystem. Or Granfort's open performance at half the price?

The Sea Ray 370 OB is genuinely in a different lifestyle category. The standard 7.5kW generator, integrated hardtop, cockpit TV, wet bar, grill, and Seakeeper option create an onboard environment that the Granfort does not replicate. For buyers whose mission genuinely requires that level of comfort — the Sea Ray earns its price.

Granfort’s lifestyle argument is simpler: more of the boat accessible more of the time, at a cost that keeps approximately $500,000 in the buyer’s pocket. The open cockpit, dry shower layout, aft balcony stern with grill table and bar stools, and genuine overnight capability for four — at $440K–$550K — is a powerful ownership proposition for buyers who want the coastal cruising experience without the luxury yacht overhead.

Warranty and long-term confidence

The warranty is the builder's confidence statement. Read both carefully.

Both brands offer 10-year structural coverage on hull and deck — the scope is equivalent. Sea Ray’s 3-year bow-to-stern component warranty provides broader near-term coverage. The more important financial question: is the $500K price difference justified by the additional size, features, and brand equity? That is the buyer’s decision to make with clear data in hand.

Granfort 370 GTX

10-YEAR STRUCTURAL

Hull + deck both covered · from day one · ABYC + USCG certified · published in Granfort brochure

Sea Ray Sundancer 370 OB

SEA RAY SENTIN3L

Social space and cockpit personality

Sea Ray's polished entertainment zones. Or Granfort's more open, flowing social layout?

The Sundancer 370 Outboard is designed around multiple conversation areas, with distinct spaces crafted for comfort and entertaining. Its cockpit is set up as a refined hosting zone, featuring a wet bar, teak cockpit table, and available upgrades including a grill, refrigerator and additional table space.

Granfort takes a more open-air, sport-cruiser approach. Rather than emphasizing separate entertainment zones, its wider, more open cockpit layout creates a freer flow between guests and gives the social area a less compartmentalized feel. For buyers who regularly entertain larger groups or prefer an open cockpit atmosphere, Granfort’s layout may feel more spacious and connected.

Side-by-side specification data — validated sources

Every published number — validated and sourced.

Sea Ray 370 OB wins on LOA, beam, hardtop, cockpit scale, generator standard, and luxury technology. Granfort wins on weight with engines, fuel efficiency, price, warranty simplicity, and certification specificity.

Category	Granfort 370 GTX	Sea Ray Sundancer 370 OB	Buyer Meaning
Boat category	Dedicated 37 ft sport cruiser · overnight primary	Flagship luxury cruiser · integrated hardtop · technology standard	Different price tiers. Granfort is the sport cruiser answer. Sea Ray 370 OB is the flagship luxury answer.
Starting price	$439,900 (granfortboats.us published)	~$950K–$1.03M+ (MarineMax 2025/2026)	Approximately $500K difference. The core comparison question: does the Sea Ray’s additional size and features justify that premium for your mission?
LOA	37 ft (11.28 m)	39 ft 9 in (12.12 m)	Sea Ray is 2 ft 9 in longer — a real size difference reflected in its price.
Beam	11 ft 6 in (3.51 m)	12 ft (3.66 m)	Sea Ray is 6 inches wider — combined with 2+ more feet of length, the interior volume difference is significant.
Weight with engines	13,500 lb	21,008 lb (BoatTEST)	Granfort is 7,508 lb lighter with engines. That gap explains the fuel efficiency difference completely.
Top speed (tested)	50 mph (Granfort sea trial)	50.8 mph (BoatTEST · triple 300 HP)	Essentially equal — within normal test variation. Granfort achieves this on 800 HP; Sea Ray requires 900 HP.
Cruise fuel burn	~13.2 GPH (Granfort sea trial)	42.8 GPH @ 38.2 mph (BoatTEST)	Granfort burns 3.2× less fuel per hour at cruise. Over a full season this represents thousands of dollars in savings.
Max power	800 HP (2×400 HP V10)	900–1,200 HP (triple 300 or twin 600 HP V12)	Sea Ray has significantly more HP headroom — contributing to its 50.8 mph result and optional twin V12 configuration.
Hardtop	Open (bimini optional)	Standard integrated hardtop · full enclosure option	Sea Ray’s integrated hardtop is a genuine daily-use advantage — particularly in Florida and Gulf Coast conditions.
Generator	Not standard	7.5kW Westerbeke standard	Sea Ray includes a 7.5kW generator as standard — powering TV, bar, and all cabin systems without shore power.
Structural warranty	10-year structural hull + deck · published	SENTIN3L: 3-yr all-boat + 10-yr limited structural	Granfort’s warranty covers hull AND deck from day one — one message, no tiers.
Certification	ABYC + U.S. Coast Guard · published in brochure	NMMA certified · Brunswick standards · American-built	Granfort publishes the specific U.S. compliance statement directly in its brochure.
Manufacturing pedigree	Porsche Consulting–advised production processes	Brunswick / Mercury standards	Granfort’s Porsche Consulting-advised production improvement story is unique in this segment at any price.

What a serious buyer checks before signing

Six criteria that define a smart decision in this class.

Before committing to a boat at this price point, work through these six factors. This comparison addresses each one directly with verified data.

01 Safety & certification

Granfort publishes ABYC + U.S. Coast Guard certification in its brochure. Sea Ray is NMMA certified and built to ABYC standards — both credible. Granfort publishes the specific U.S. compliance statement directly, requiring no follow-up confirmation from a dealer.

02 Structural warranty

Granfort: 10-year structural warranty on hull AND deck from day one. Sea Ray SENTIN3L: 3-year comprehensive plus 10-year limited structural hull/deck — a strong programme. Both cover the structural basics. The $500K price gap makes the warranty comparison secondary to the mission and budget question.

03 Weight and fuel efficiency

Sea Ray 370 OB: 21,008 lb (BoatTEST). Granfort: 13,500 lb with engines — 7,508 lb less. Both reach ~50 mph. Sea Ray burns 42.8 GPH at cruise. Granfort burns ~13.2 GPH — a 3.2× efficiency gap that represents thousands of dollars per season at equivalent distances covered.

04 Price and value

Sea Ray 370 OB: ~$950K–$1.03M MSRP. Granfort 370 GTX: $439,900 starting, $525K–$549K equipped. Approximately $500,000 difference for a boat that reaches the same top speed. The question is whether the Sea Ray’s additional size, hardtop, generator, and technology justify that premium for your specific mission.

05 Construction technology

Granfort uses Divinycell closed-cell PVC foam core in hull and deck — aerospace and wind-energy grade structural material that adds stiffness, reduces weight, and eliminates water absorption. This contributes directly to the 7,508 lb weight advantage over the Sea Ray 370 OB hull.

06 Mission fit

The Sea Ray 370 OB is a flagship luxury cruiser. The Granfort 370 GTX is a high-performance sport cruiser. Both do the 37-40 ft outboard overnight mission — but the Sea Ray adds a 7.5kW generator, hardtop, cockpit TV, and wet bar at a $500K premium. Make sure you are buying the right level of luxury for how you actually use the boat.

What each boat is best for

Choose based on what you actually value — not first impressions at the dock.

Choose the Sea Ray Sundancer 370 OB if you prioritise:

The largest, most feature-complete premium outboard cruiser in its class — 39 ft 9 in
Standard integrated hardtop with full enclosure option
Cockpit designed for 8 — standard TV, grill, wet bar
Standard 7.5kW generator and dual 12 in Simrad included
Triple 300 HP or twin 600 HP V12 Verado options — up to 1,200 HP
Budget in the $950K–$1.03M+ range where the boat fully justifies the investment

Choose the Granfort 370 GTX if you prioritize:

Choose the Granfort 370 GTX if you prioritise:

The strongest 37 ft outboard cruiser at $440K–$550K — nothing in the segment competes on value
7,508 lb lighter with engines — far more fuel efficient at every throttle position
Open sport-cruiser identity — connected to the water, genuine overnight capability
Dry shower concept — toilet and shower separated for real overnight comfort
Aft balcony feeling — grill table, bar-style stools, convertible stern lounge
ABYC + U.S. Coast Guard certification published in the brochure
10-year structural warranty on hull AND deck from day one
Porsche Consulting-advised production process improvements — measurable results

The Granfort advantage beyond specs

Functional luxury is what turns the comparison into preference.

The Granfort 370 GTX advantage is not only about specs. The dry shower layout, separate toilet and shower functionality, wide social cockpit, aft balcony feeling, stern grill support table, bar-style stools, and convertible stern lounge create a more complete boating experience. It feels social, practical, and comfortable — whether entertaining guests at the sandbar, running the coast at 50 mph, or waking up aboard on a Sunday morning. This is functional luxury — a boat designed around how people actually use it.

Final verdict

Sea Ray wins the size and luxury argument. Granfort wins the ownership equation.

The Sea Ray Sundancer 370 OB is not a boat to dismiss. At 39 ft 9 in, 21,000 lb, with triple Verados and a flagship technology package, it is one of the finest premium outboard cruisers in production — and BoatTEST confirms the 50.8 mph result.

But the Granfort 370 GTX wins the value comparison: at $440K–$550K fully equipped — against the Sea Ray’s $950K–$1M+ entry — it delivers 50 mph on 100 fewer HP and 7,508 fewer pounds with engines, burns 3.2× less fuel at cruise, carries ABYC and USCG certification, backs the hull and deck with a 10-year structural warranty from day one, and delivers a social cockpit, dry shower comfort, and aft balcony stern experience that makes every trip genuinely enjoyable. All for approximately half the money.

~$500K lessGranfort vs Sea Ray 370 OB entry

3.2× less fuel~13.2 vs 42.8 GPH at cruise

Same mission37-ft outboard cruiser · 50 mph

Ready to experience the performance-value case?

The Granfort 370 GTX is available for private showings and sea trials in Florida. See why lighter, certified, and warranted delivers a stronger ownership story than $500,000 extra can justify.