Pontiac 400 build Ideas
#1
Senior Member
MASTER BUILDER
Thread Starter
Join Date: Oct 2006
Location: West by God Virginia
Posts: 158
Pontiac 400 build Ideas
I am getting ready to do a 400 build for my 65 GTO. This is my first Pontiac and do not know what combos work. I am starting with a 75 TA engine with 6x heads. This is not a race car just a good street car. Would like to get around 400 hp. Any help would be really appreciated. Dont mind buying some parts but would like to stay on a decent budget. :?
#2
Senior Member
RACING JUNKIE
Join Date: May 2006
Posts: 2,044
Ok, you need compression!!!
First off I'd get the heads milled, with OEM pistons them big chambered 6x heads will have your compression pretty low > 7.6 to 1 , W/ .050 milling it would bring the number closer to 8.2 -1
My lawn mower has more than that. :shock:
Assuming your doing a complete rebuild, have the block bored/sqaured, and opt for flat tops pistons over OEM replacement slugs.
A competiton valve job (3 angle)
Comp Cams XE274H or XE262H would be good cam choices
Edlebrock performer rpm/ or performer RPM air gap intake
750 CFM holley Dp or equivelant carb
Headers > W/free flowing muffs & exhaust
373's gear in the rear & 2500 converter
Goodluck, Cp
First off I'd get the heads milled, with OEM pistons them big chambered 6x heads will have your compression pretty low > 7.6 to 1 , W/ .050 milling it would bring the number closer to 8.2 -1
My lawn mower has more than that. :shock:
Assuming your doing a complete rebuild, have the block bored/sqaured, and opt for flat tops pistons over OEM replacement slugs.
A competiton valve job (3 angle)
Comp Cams XE274H or XE262H would be good cam choices
Edlebrock performer rpm/ or performer RPM air gap intake
750 CFM holley Dp or equivelant carb
Headers > W/free flowing muffs & exhaust
373's gear in the rear & 2500 converter
Goodluck, Cp
#4
Senior Member
MASTER BUILDER
Thread Starter
Join Date: Oct 2006
Location: West by God Virginia
Posts: 158
Originally Posted by cepx111
Ok, you need compression!!!
First off I'd get the heads milled, with OEM pistons them big chambered 6x heads will have your compression pretty low > 7.6 to 1 , W/ .050 milling it would bring the number closer to 8.2 -1
My lawn mower has more than that. :shock:
Assuming your doing a complete rebuild, have the block bored/sqaured, and opt for flat tops pistons over OEM replacement slugs.
A competiton valve job (3 angle)
Comp Cams XE274H or XE262H would be good cam choices
Edlebrock performer rpm/ or performer RPM air gap intake
750 CFM holley Dp or equivelant carb
Headers > W/free flowing muffs & exhaust
373's gear in the rear & 2500 converter
Goodluck, Cp
First off I'd get the heads milled, with OEM pistons them big chambered 6x heads will have your compression pretty low > 7.6 to 1 , W/ .050 milling it would bring the number closer to 8.2 -1
My lawn mower has more than that. :shock:
Assuming your doing a complete rebuild, have the block bored/sqaured, and opt for flat tops pistons over OEM replacement slugs.
A competiton valve job (3 angle)
Comp Cams XE274H or XE262H would be good cam choices
Edlebrock performer rpm/ or performer RPM air gap intake
750 CFM holley Dp or equivelant carb
Headers > W/free flowing muffs & exhaust
373's gear in the rear & 2500 converter
Goodluck, Cp
#7
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RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
Ironically the guy that owns Wallace Cacl. is a Pontiac nut and has a whole section on pontiac builds and people who run them, might be worth checking them out.
Zip.
http://www.wallaceracing.com/index.html
Zip.
http://www.wallaceracing.com/index.html
#8
Junior Member
APPRENTICE
Join Date: Mar 2003
Location: Atwater, CA
Posts: 22
My two cents and personal experience-
I would not run the 6X heads. I believe they are smog heads they have a 2.11 int. with a 1.66 ex. and larger CC.
Find a set of RAIII or the RA II series - #48, 16, 12 or like heads. They feature 2.11 int. valve and 1.77 ex valve. and 72 cc’s. Don't do anything to the combustion chambers. These heads are still plentiful on the internet/ wrecking yards or just laying around in Pontiac guy’s garage. Port match/ clean up the ports. Go to Wallace Racing website and look at the head codes. All head specifications are listed…..do your homework before you buy/ build.
Run a good flat top forged piston with any of these heads.
Cam- Crower solid #60311 or the hyd #60211 (I personally ran the #60311).
Edelbrock torker or victor jr. intake. Run a 750 -800cfm dp sq bore Holley
Hooker 1 ¾” primary tube w/ 3” collector with 3” full exhaust.
3.73 gear with a “good set of street tires”.
If you have a 4 spd, your 65’ will run/ should run bottom 12’s or crack high 11’s on a good set of street tires……. I know, I ran the combination years ago in my 64 GTO and the car was VERY streetable and ran the numbers.
I would not run the 6X heads. I believe they are smog heads they have a 2.11 int. with a 1.66 ex. and larger CC.
Find a set of RAIII or the RA II series - #48, 16, 12 or like heads. They feature 2.11 int. valve and 1.77 ex valve. and 72 cc’s. Don't do anything to the combustion chambers. These heads are still plentiful on the internet/ wrecking yards or just laying around in Pontiac guy’s garage. Port match/ clean up the ports. Go to Wallace Racing website and look at the head codes. All head specifications are listed…..do your homework before you buy/ build.
Run a good flat top forged piston with any of these heads.
Cam- Crower solid #60311 or the hyd #60211 (I personally ran the #60311).
Edelbrock torker or victor jr. intake. Run a 750 -800cfm dp sq bore Holley
Hooker 1 ¾” primary tube w/ 3” collector with 3” full exhaust.
3.73 gear with a “good set of street tires”.
If you have a 4 spd, your 65’ will run/ should run bottom 12’s or crack high 11’s on a good set of street tires……. I know, I ran the combination years ago in my 64 GTO and the car was VERY streetable and ran the numbers.
#9
Junior Member
JOURNEYMAN
Join Date: Apr 2004
Posts: 29
Heres my 2 cents, find a 455 run the 6x get a good valve job! Port match a Torker intake not a Torker II run an 800 Quadrajet that has been built by someone who stakes there rep on them. run a good solid (roller if the $$ are there) 520-550 lift range, H-beam rods (they are around $300.00 a set) forged flat tops, make sure your crank is true, block squared etc. You should be around the 8:5 comp. range , pump gas. This combo will last and have gobs of torque, good luck getting it too hook up!!!!
#10
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RACING JUNKIE
Join Date: Mar 2009
Location: kingsport tn
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