302 to a 331 ?

One91Fox · Jan 6, 2009

What is the easiest and best way to turn a factory 5.0 302 into a 331?

One91Fox · Jan 6, 2009

From 302 to 331

What is the easiest/ best way to take a factory 302 that has a few modifications and turn it into a 331?

Didn't mean to post twice, computer messed up.

irish · Jan 6, 2009

Buy a 331 stroker kit, take both to a good machine shop, done.

Sell the 302 and buy a shortblock from Fordstrokers.com, done.

Matt

Brian@PAR · Jan 6, 2009

Don't do it at all. Turn that 302 into a 347 using the same procedure as above.

tiptop · Jan 6, 2009

yep, give woody a call at ford strokers

One91Fox · Jan 6, 2009

Are all these recomendations coming from experience with these blocks?

QUICK91LX · Jan 7, 2009

This sort of thing has been done countless times with stock blocks...you can either go the route of purchasing the stroker kit and taking your motor along with the kit you buy to a machine shop who will do all machine and assembly work for you....or buy the motor in short block or even crate engine form from any of the various sources available...the Mustang aftermarket is huge. Do some research on heads, intakes, cams and all other various supporting mods for your project.

bynummustang · Jan 7, 2009

Make sure you know why you have chosen 331 over other strokers. Research and plan your motor from oil pan to throttle body.

FastDriver · Jan 7, 2009

If done for the right reasons, going with a 331 can be preferable to going with a 347. However, the majority of gear-heads will be better off going with a 347. They have 16 more cubes and therefore will make more power, all else equal.

As mentioned do your homework, plan out the entire build, pick a block and internals that meet your requirements, and then find a good machine shop that you have faith in. Determine how much you expect everything to cost, then set aside twice that and you'll be ready for the project.

Chris

One91Fox · Jan 7, 2009

So which would be better for a daily driven car that would see both road courses and drag strips? Possibly going to add a supercharger to the combo as well.

ShortThrow50 · Jan 7, 2009

its easier and sometimes cheaper just to buy an already built stroker bottom end. i got my 347 shortblock built by woody at fordstrokers.com. if yor gonna do a blown 331 or 347, you should prolly buy a block that can handle the power and thats gonna run you almost 2k extra. IMO if you wanna go the blower or turbo route, you should just stay with a 302. If yor gonna go with the regular stock block n/a stroker route or any route for that matter i hope you have something other than stock h/c/i

Grn92LX · Jan 7, 2009

Brian@PAR said:
Don't do it at all. Turn that 302 into a 347 using the same procedure as above.

One91Fox · Jan 7, 2009

What would be a better h/c/i combo for the 347 stroker than what I currently run on my 302?
Current h/c/i is ported stock heads, b303 cam, and gt-40 intake. I know that there are many other parts that are much better, but what are some individual opinions on what combo to run?

Bullitt347 · Jan 7, 2009

One91Fox said:
What would be a better h/c/i combo for the 347 stroker than what I currently run on my 302?
Current h/c/i is ported stock heads, b303 cam, and gt-40 intake. I know that there are many other parts that are much better, but what are some individual opinions on what combo to run?

AFR 185 heads, custom cam, Edelbrock Performer RPM 2 or Victor EFI (depends on LOTS of things) or even a TFS Intake. Do not forget bigger fuel injectors, Throttle Body, MAF...........ect............

ShortThrow50 · Jan 7, 2009

Bullitt347 said:
AFR 185 heads, custom cam, Edelbrock Performer RPM 2 or Victor EFI (depends on LOTS of things) or even a TFS Intake. Do not forget bigger fuel injectors, Throttle Body, MAF...........ect............

i agree or at least spend 2400 on a tfs top end kit. you can substitude the stage 1 cam out for a stage 2 if you call summit. i run a stage 2. that kit is complete and flows close to afr 185 heads

One91Fox · Jan 7, 2009

ShortThrow50 said:
i agree or at least spend 2400 on a tfs top end kit. you can substitude the stage 1 cam out for a stage 2 if you call summit. i run a stage 2. that kit is complete and flows close to afr 185 heads

If you don't mind me asking, how much power does your setup put out?

Brian@PAR · Jan 7, 2009

Here is a suggestion

Rebuild the 302 using some light hyper pistons and put a set of RHS 200 heads, custom cam and a track heat intake on it. You'll make 425 at the flywheel N/A. The motor will idle smooth, not load up, and pull to 7K. Save your dough for an early, Mexican, or aftermarket block (BOSS 302 would work just fine) then do the 347 with the same parts but a new cam and make 550 N/A.

You could do the 347 in a roller block but you are pushing your luck at 550 and the tune is critical at that power level in a roller block.

Oh and IMO the only reason to do a 331 is if you are an inexperianced builder as there are some things that are "special" about a 347. Opinions vary on this subject but there are two things that are NOT a concern. Built right a 347 will not use oil and the rod stroke ratio is not an issue.

FastDriver · Jan 7, 2009

Brian@PAR said:
Oh and IMO the only reason to do a 331 is if you are an inexperianced builder as there are some things that are "special" about a 347. Opinions vary on this subject but there are two things that are NOT a concern. Built right a 347 will not use oil and the rod stroke ratio is not an issue.

Because it's not worth starting argument/long-winded-discussion #1423 on this subject, I'll just say that I completely concur with the bolded portion of this quote, and in the OPs case, there is no reason to build a 331.

Chris

reddog · Jan 8, 2009

If you want a stoker that will last.... go with the 331.. but don't go the cheap way out buy good stuff man!!! If its a pinks show, just buy something thats cheap or on sale!!!!

ShortThrow50 · Jan 8, 2009

One91Fox said:
If you don't mind me asking, how much power does your setup put out?

havent fired it up yet bro. its still on the stand. i will let you know when it goes to the dyno. the picture below was when i test fitted to see if the engine would go in with the lt headers attached. needless to say it di

302 to a 331 ?

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