I have an 84 Chevy K20 LWB with a 4' lift and 35' tires. I want a little bit of both worlds with HP and Torque. Got the truck with the engine freshly rebuilt already and just wanted some advice and ideas to get it going a little better. Specs on engine are:
1970 Chevy 4 bolt main 400 cubic inch 509 Casting
Bored .030 over (makes it a 406 cubic inch)
Flat Top pistons 9.5 to 1 compression ratio
Comp Cams Magnum camshaft (270 H)
Weiand Stealth aluminum dual plane intake manifold
Edelbrock 600cfm carburetor
Milodon oil pan
GM performance parts valve covers
Carter high volume fuel pump
Hedman Ceramic coated headers
I use the truck for daily driver and mudding as well. I like to have some speed of the line if possible just for fun. Just looking for any ideas to improve the engine.
Only thing i see bad on that combo is the carb, 406 will need a 700-750 if you rap it up at all over 4500 rpm. If you have an auto tranny you may want to get a higher stall converter. Re-gearing the truck may provide an increase in performance. 4.56s with 35 inch tires will result in a final drive comparable to around 3.73-4.11s on a stock 29-30 inch tire. About the only thing I can see other than that is to replace the heads with good ones if you don't already have some. Chevy's vortec heads are about as good as you can get in iron, but a good set of aluminum heads would be the next step. (since you didn't list the heads i'm assuming you have some 80 heads, which are the poorest heads other than the early 90s tbi heads)
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