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Old 08-11-2002, 04:33 PM
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Question 400cid Engine recommendations.

Hey all... as you can see i'm new to this board. Just had a question i'd like to put there. I recently purchased a 1971 GTO. Got it home and began an intensley thorough inspection of the engine. basically i pulled it out and began to disasemble it. The block is a 400cid and has bored to .030 over. I'm trying to get about 425hp out this without having to goto anything to radical such as NOS or a big blower. I was wondering if anyone could offer some suggestions. Any and all help is appreciated.


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Old 08-11-2002, 07:03 PM
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It really depends on the heads you have, here should be a letter and some numbers right smack dab in the middle.
Once you have the numbers try a search on Google for info. There are some great Heads out there, If you got a set your 3/4 of he way Home.
Poncho's are all abou torque, It gets real pricey when you try to push those ponies numbers up there.
I have a 400, in my 75 firebird. 30 over with stock flat top pistons and 6X heads. I use a Comp 280 cam, roller rockers and performer with a 700 dpp and 2600 stall (350th). At 3600 lbs she does 12.80's 106mph with 3;73 gears and 28.5 slicks. (needs more gear). This is a streetable motor.
If you have more gear and stall, there are some EXTreme Energy cams that will boost it even higher
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Old 08-13-2002, 08:02 AM
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A set of 6x-4 heads milled to about 85cc, a RA IV cam, and an edelbrock Performer RPM intake should get you close with either a big quadrajet or 800+cfm edelbrock or Holley.
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Old 08-13-2002, 08:31 AM
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chickenhead, oops, i mean, mr. chickenhead, do you know if that will work on a 326 if i get the heads worked? and 2, have you heard of dave bisschop's SD performance in Abbotsford BC?
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