Are these the correct heads for my 68 350, what are the valve sizes and compression ratio for the stock engine?
Thanks,
Doug

 

#5 heads were factory installed on ALL 1968-69 350s, including W-31s. All had the same 64-ish cc chambers (actual chamber volume varies with manufacturing tolerances). CR was changed with piston dish size - large dish pistons provided 9:1 CR, small dish 10.25:1, flattops (on W-31s only) were 10.5:1. Valves were 1.875/1.562 on all except W-31s, which got 2.000/1.625 valves.

 

Joe,
Thanks for the info!
Doug