Add hotter cam or Add hotter head ?

318willrun said

Per sake of the discussion, let's say the car is a '72 Duster, 318 with and addition of 600 eddy carb on a performer intake and 2.25" duals ran out the back from the stock manifolds. The car has a 904, and 3.23 gears. All in good working condition.
*WHAT MOVES THE CAR QUICKER IN THE QUARTER MILE?
- A hotter cam, any cam and lifter kit you can buy or have custom ground.
- A hotter head, any head is the option including trick flows.
- no other changes to the car can be had.

Click to expand...

Look at the flow increases .100-.400 on ported 318 heads, low 130's cc intake port small fast exh, then ponder milling them from 'open 68 .022 to 64cc' or 'closed style 66cc milled .024 down to 62cc'...
I think when people read my initial answers they don't figure in that you have the ability to have a smaller combustion chamber and that means more compression and yes that means a few more horsepower as well.
The 318 heads I've tested near .400 lift are only around 160 something CFM... ported with the same valve they're at 195-200 CFM with gains also below. It's obvious if you factor everything...you're looking at an available airflow increase to make 70 more horsepower. 'At the heads' ...and all inside the stock cam lift range. Ps, no one said you can't run a geometry kit .lol