This is topic 331 ????? in forum Tech Talk at Northern California Ford Owners  .


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Posted by project_stangs88 (Member # 4599) on :
 
i just picked up a 331 short block, also some performer rpm heads, my ? is that would i have to get the heads worked on to get me good power or are the heads good right out the box.. any advise would help, trying to maybe do high 10's on motor?? best cam for setup? lmk thanks
 
Posted by turbo50 (Member # 6700) on :
 
If you wanna go 10s on motor that thing better hook, better be light.

As far as the combo I would hope that 331 has some good compression. I think with the right cam/compression and cylinder head you can go 10s on motor with your 331 but that thing will be screaming.

You would have to have nearly 550hp at the flywheel for about 3000 pounds to run high 10s and that is in a perfect world.

I would suggest starting over with a 408 and some appropriate heads or adding nitrous/boost if that is your goal.

With nitrous or boost those performer rpms and the 331 will see 10s.
 
Posted by threethirty1 (Member # 7814) on :
 
quote:
Originally posted by project_stangs88:
i just picked up a 331 short block, also some performer rpm heads, my ? is that would i have to get the heads worked on to get me good power or are the heads good right out the box.. any advise would help, trying to maybe do high 10's on motor?? best cam for setup? lmk thanks
Lol, Your gonna need to spin 7k with 4:30s and under 3000#s. It can be done. Some guy on the corral made 418rwhp with his 331. 11:1, hi ports, monster cam etc..
 
Posted by primed351 (Member # 8613) on :
 
is it a factory 302?
 
Posted by project_stangs88 (Member # 4599) on :
 
its a stock 302 from 88 fox 5.0... the 331 is going in a 65 mustang, 4:10' fuel cell, drag suspension ect... 10:1 comp... forged everythang, just wana see if i have to do any work to the heads to get more power or leave them the way they are, or get new heads?
 
Posted by 92stangLX (Member # 3252) on :
 
quote:
Originally posted by project_stangs88:
its a stock 302 from 88 fox 5.0... the 331 is going in a 65 mustang, 4:10' fuel cell, drag suspension ect... 10:1 comp... forged everythang, just wana see if i have to do any work to the heads to get more power or leave them the way they are, or get new heads?
Not really a drag racer but.. prolly gonna have to slap some NOS on that bitch to run that fast.
 
Posted by 2stangs69-91 (Member # 1951) on :
 
the heads will limit you. It can be done with a 331. It has been many times. Alot will depend on how well your car works. I would step up to a Vic JR head if you want to stay a little cheaper. Sell your RPMs to offset the cost, or you could just go run the car how it is and see how it does. It wont be a heavy car

[ January 08, 2010, 07:30 PM: Message edited by: 2stangs69-91 ]
 
Posted by BCINGUU (Member # 2397) on :
 
quote:
Originally posted by 92stangLX:
Not really a drag racer but.. prolly gonna have to slap some NOS on that bitch to run that fast.
Or a Vortech... Even then, good luck getting into the 11s... You will need good fuel delivery.
 
Posted by 707vibrantcobra93 (Member # 4702) on :
 
I ran the same heads on a 347 n/ a with a tfs stage 2 cam and 10.25 to 1 comp ratio and only made 365 hp and 380 tq to the wheels. Now I run the same bottom end with some good machine work a custom cam and afr 185 heads and a Vic 5.0 intake and I run 125 mph trap speeds but the car was 3300 pounds and I wasn't 60 footing where I should be and couldn't get under 11.5. Now I'm going carb and major weight savings to try for that 10.99. Also my performers had a serious port job and bowl work and the afr heads out of the box make so much more power.
 
Posted by phildog (Member # 1214) on :
 
I wouldn't pour a bunch of money into stock-type heads. If it were me, I would pick up a set of TFS FAC 190 heads, High Ports or some racy TEA modded heads. Lots of power is made in the heads, and trying to get stock replacement heads to knock your socks off is not going to come cheap.

Stock type heads are great for a street guy who just wants a quick car, maybe into the 11s.
 
Posted by project_stangs88 (Member # 4599) on :
 
IM TORN BETWEEN DA 331 I ALREADY HAVE OR BUILD A 408??
 
Posted by 707vibrantcobra93 (Member # 4702) on :
 
Go with the 408. I didn't even have my 347 all the way done and I bought a 351 block to stroke out. Bigger is always better IMO.
 
Posted by phildog (Member # 1214) on :
 
Well of course a 408 would be great. Hell, cut the towers and lay in a 14-1 comp 532" and add a fogger and a plate and...you can go on and on. The point I am trying to make is that a 331 can go 10's on the motor. It will need a well matched combo and a good tune. An off the shelf cam and a set of stock replacement heads is going to disappoint.

Remember that it is the entire combination.
 
Posted by fasthatch (Member # 7277) on :
 
you guy know there someone run 9.70s with a 306 an baby turbo an stock cam an out the box trick flow twisted wedge heads an his seats a little over 3000 lbs
 




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