Alloy heads

Apologies guys, yes you do need to know more. Was a quick post late last night.

Car, AP6, is '65 Valiant. Engine is SBM 318 with 0.40 over KB167 pistons, Comp XE268 cam. Still working on exhaust because car has a custom rack and pinion setup and T5 5 speed box. All that in a right hand drive car makes exhaust plumbing difficult! Currently running 600 Sq bore Holley on Eddy dual plane manifold, but intend to run EFI in the future.

I'm not looking for massive power, 300hp at the wheels would be nice. As I said, heads are already nice and have bigger valves but I don't know valve sizes. Heads were built by ex Chrysler mechanic for torque and good mid range.

So my only real logic in head change is for weight reduction. Car weight is 1400 kilos (under 3100 lb). I would love to reduce weight over the front to improve front to rear balance and cornering.

Cheers,

Robert