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454-496 stroker help!

Old 01-05-2019, 10:06 PM
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Default 454-496 stroker help!

Hey guys new to the Forum! I have an 87 Formula 242ls that I recently picked up a 454 MAG MPI (380hp I believe) and a bravo1 drive for a great deal. I did a lot of reading on power upgrades for this engine and it seams like Iím pretty limited, I am leaning towards removing the fuel injection, bore and stroking to a 496, using the stock heads, valvetrain, exhaust and then buying an intake. My friend has an 850cc carb that heís willing to give me. My marina currently has 93 octane fuel so Iím not limited there. My question is what recommendations and problems could I run into? Has anyone done a similar build that could give their input? What type of power do you think I would see? The original motor was a 454 (330hp) and it was fun but looking to get allitle more out of it ecspecialy with the engine already out and on a stand. Thanks in advance!
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Old 01-05-2019, 10:19 PM
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To get any real benefit, you need to do cam/valve train and exhaust. Without those its a waste of time and money to stroke it.
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Old 01-05-2019, 11:37 PM
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Any recommendations for a cam? Iím definitely open to changing it out but Iíve been reading allot about reversion. I want to avoid goin with too big of a stick and finding out after the motors back in the boat. Marine motors are new to me and Iíve looked into diffrent exhausts but they seam to come with a heavy price tag. Any input on a good exhaust that wonít break the bank?
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Old 01-06-2019, 12:25 AM
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search button, there are 435489175 threads on 454 builds. how much are you trying to get out of it??? how much do you want to spend?
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Old 01-06-2019, 07:58 AM
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What Griff said is spot on. Boats are not as rewarding as cars on upgrades. Takes a lot more power increase in a boat to see performance increase as opposed to a car. You can go mild upgrades to make it sound good, but don't expect huge speed increase. You sure you want to ditch the fuel injection? I agree the sound of a carbureted engine with a high lift cam is great, but turn key drivability of fuel injection is nice when you are loading and docking. Yes marine exhaust is expensive but you got to have it if you want increase in power,
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Old 01-06-2019, 08:51 AM
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I would use a RPM air gap dual plane intake, call comp cams tell them your combo, let them grind a cam that will give you max power @5500-5700. The 850 might be a tad large but will work, a 750 would be better, that package will work fine.
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Old 01-06-2019, 11:57 AM
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and dont buy a cheap cast crank stroker kit...
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