[94' Cobra 351]

Couldn't find any previous posts about this. I am on the fence about either stroking my 351w to a 408, or supercharging it. I was concerned with stroking it because I heard the driveability of the car goes down. I also wasn't sure what sort power gains I would see from stroking it. I am really trying to find someone who has a 408 stroker. Any advice at all would be great.

[03 R Code]

Do both.

[Justincredible]

Originally Posted by 94' Cobra 351 Couldn't find any previous posts about this. I am on the fence about either stroking my 351w to a 408, or supercharging it. I was concerned with stroking it because I heard the driveability of the car goes down. I also wasn't sure what sort power gains I would see from stroking it. I am really trying to find someone who has a 408 stroker. Any advice at all would be great.

Driveability will not suffer with the 408 if you dont get greedy on the cam selection and have it tuned by a good tuner. (provided you keep the EFI).
With that said...the cost of the supporting hardware will add up quickly to acompany the 408 at a power level comprable to a blown 351.

A supercharger and your existing 351 will yeild more hp for the money spent untill you get into the 600+ hp range.

[94' Cobra 351]

what do you mean by supporting software for a 408?

[Darrell]

Driveability does't suffer from cubic inches. A 408 will drive just fine.

[94' Cobra 351]

well i had heard the the extended stroke of the piston causes more friction and wears the block faster, and that it also doesn't rev as high with a longer stroke. any idea what kind of power gain i should see from a 408 stroker?

[sleepinggt]

351 produces more than enough for everyday fun...if it's for racing the best thing is to get a properly tuned wet kit...weigh's alot less than a s/c or turbo set up

[94' Cobra 351]

its not a daily driver, it is going to be my weekend summer car, and i don't want any imports around town showing me up. and i don't want to go the nitrous route, not a big fan.

[Justincredible]

[quote="94' Cobra 351"]what do you mean by supporting software for a 408?[/quote

I didnt say software...I said hardware. By hardware I refering to the bigger heads, cam, and intake etc. that would be needed to acompany the 408 to let it make the same power as your current 351 with just a blower bolted onto it.

Dont get me wrong...Im all about bigger cubes...but to answer your question...the blower will offer you the best hp per dollar ratio on a pump gas engine.

[94' Cobra 351]

i have GT40 heads, and a 292-292 512 max cam, you don't think they will support the 408? and i know if i go with a blower i have to lower the compression, what are different ways to go about doing that?

[Darrell]

Originally Posted by 94' Cobra 351 well i had heard the the extended stroke of the piston causes more friction and wears the block faster, and that it also doesn't rev as high with a longer stroke. any idea what kind of power gain i should see from a 408 stroker?

No the block doesn't wear faster and the stroke has nothing to do with the engine reving. As long as the heads can keep up and has the proper cam, the engine will have no problem making power at high rpm. I have a 4.100 stroke and spin over 8000 rpm.