This is topic 331 stroker and gt-40 aluminums? in forum Tech Talk at Northern California Ford Owners  .


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Posted by svfreerider87 (Member # 5748) on :
 
what's the ford community's opinion on running a 331 stroker with gt-40 aluminum heads with gt-40 upper and lower plentums? is this a pretty good set up? any estimation on power to the wheels with a mild porting of the heads? (btw have all basic bolt ons to go with it ie injectors bigger fuel pump, full exhaust, (all the basic bolt ons). any and all input greatly appreciated.
 
Posted by iceman302 (Member # 7180) on :
 
What cam?

Depending on a lot of variables, including the dyno... somewhere between 325-350 rwhp with all of the right supporting parts.
 
Posted by 2stangs69-91 (Member # 1951) on :
 
I run this setup with a blower and it works OK. If I ever build a 331 N/A I would go with a better head than a GT40 aluminum. A nice AFR or even Vic Jr. head would work great.
 
Posted by svfreerider87 (Member # 5748) on :
 
is this combination nitrous friendly? [Big Grin]
 
Posted by iceman302 (Member # 7180) on :
 
quote:
Originally posted by svfreerider87:
is this combination nitrous friendly? [Big Grin]
Nitrous is never friendly LOL.
 
Posted by SmokinLX (Member # 1684) on :
 
GT 40's are better on 302's. Spend the extra money on the head's.
 
Posted by 98slowhoe 'FIFTYLX' (Member # 895) on :
 
I run Vic Jr's on my 331 and I wouldn't go with anything smaller or lesser unless it was stock block and I was pushing 10+lbs of boost. N/A get something better. Atlest some performer RPM's TW's ported or 165's at the very least. But depends on your supporting hardware.
 
Posted by svfreerider87 (Member # 5748) on :
 
so gt 40s are best for going with a stock bore?would i be better keeping the gt40s and going stock bore and eventually going supercharged?
 
Posted by 92stangLX (Member # 3252) on :
 
quote:
Originally posted by svfreerider87:
so gt 40s are best for going with a stock bore?would i be better keeping the gt40s and going stock bore and eventually going supercharged?
This combo will work fine on a 331. However, you will get more power with a better set of heads. If you can afford it I would go with a set of TFS heads instead. If not then run the 331 with the GT40's. You will get more torque then the 302. Also, consider porting the lower intake.

If you are going to add a blower later make sure you build the motor with boost in mind. Keep the comperession at 9:1 and make sure you have a strong forged bottom end with good head gaskets.
 
Posted by svfreerider87 (Member # 5748) on :
 
I can port the upper and lower intake plentums right? how about the throttle body and egr spacer?
 
Posted by jmoney347 (Member # 4702) on :
 
i had to get rid of my gt-40s for some edelbrock performers with a port job because i could flow enough cfm to feed my 347 it would have choked it out at higher rpm. i would definetly go with a different head. cam selection is also important
 
Posted by 92stangLX (Member # 3252) on :
 
quote:
Originally posted by svfreerider87:
I can port the upper and lower intake plentums right? how about the throttle body and egr spacer?
You can port the lower but not the upper on a GT40. They only thing you can do is enlarge the throttle body opening (probably a good idea).
 
Posted by svfreerider87 (Member # 5748) on :
 
what can I do as far as cleaning the intakes, they're all gummed up with some sort of blackish petroleum substance, can i have them hottanked or something similar?
 
Posted by 92stangLX (Member # 3252) on :
 
You can have them hot tanked or just buy a shitload of carb cleaner and go to town.
 




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