33417369 Heads? Any good?
03-23-2003, 07:20 PM
#1
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Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
33417369 Heads? Any good?
I found a truck at the junkyard with a good set of heads on it, casting number 33417369. They have 'Hecho en Mexico' cast into the rocker valley. The only info that I can find is that they are 90-up GM Goodwrench crate heads, 76cc chambers, 1.94/1.6 valves. I also found that they are 'heavy castings'. Does anyone know much about these heads? Could they be ported and flow well on a 400?
03-23-2003, 08:32 PM
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
CHP did a "Budget 350" series of articles that they started with that motor and those heads.
After milling 3 cc's off, using the Fel-Pro embossed steel shim .015" gasket, pocket porting, cutting the exh. valves with a 30* back cut, using the Comp Cams Xtreme Energy 268H cam, and running hooker 1 5/8" headers they were able to get 336 HP out of them.
IMHO, that's a lot of work for 336 HP.
http://www.chevyhiperformance.com/te...26/index4.html
After milling 3 cc's off, using the Fel-Pro embossed steel shim .015" gasket, pocket porting, cutting the exh. valves with a 30* back cut, using the Comp Cams Xtreme Energy 268H cam, and running hooker 1 5/8" headers they were able to get 336 HP out of them.
IMHO, that's a lot of work for 336 HP.
http://www.chevyhiperformance.com/te...26/index4.html
03-24-2003, 02:44 AM
#4
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These are low performance heads.
Don't expect great things out of them.
A 400 deserves a better head. Look into a entry level
Pro action cast iron head or a Dart iron eagle.
Better to save your money and invest in a better head.
Don't expect great things out of them.
A 400 deserves a better head. Look into a entry level
Pro action cast iron head or a Dart iron eagle.
Better to save your money and invest in a better head.
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