Im rebuilding my motor on my 350 convertible Malibu and I just got a nice stack of $ from Santa. The heads I have are GM cast aluminum heads 58cc 1.94/1.50. How much difference will it be if I buy some aftermarket 2.02 aluminum heads?
The cam I am putting in the motor is a Comp cam with a 218/224 @.050 and 460/470 lift. Its a 10:1 compression motor with headers and Flowmasters. It also has MSD with an HEI and an Edelbrock performer manifold.The motor is .030 over.
You could always go the route of having your heads machined to accept 2.02/1.60, have the right springs for the cam installed and maybe some port+pollish work if the cash hasen't run out yet.. Those aren't "Fast-Burn" heads are they? 'Cause if they are I'd just have them machined and you'll get outstanding results.
Muncie M20 (in conversion)
'62 Vette Posi 3.70 rear (in conversion also )
Are the "gm aluminum heads" the old L98 corvette heads? From the small chamber and valves, it sounds like it.
I would not spend a lot of money on them (port work). I have heard that they don't have a very efficient design.
depending on how much money you want to spend, you might consider world products sportsman II heads, or if you want aluminum heads you might look into some trickflow 23° heads. Both of these heads are supposed to be good for around 400HP on a streetable 350.
If you dont want to spend as money and aren't planning on making over 350HP, GM vortecs are popular.
Charles Perrell [email protected]
65 malibu SS Convertible
283 2v powerglide
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