318 Build

Hey rosco what's this going in, the charger?

When I was looking at the IMM RHS heads the flow figures quoted were 257cfm @500 and 261@600 from what I recall.

The gears and converter will have an impact on what cam you will be able to run especially if you want to run the std 904 converter.

Are you planning to keep it stock stroke 318 or 390 stroker? There are a few pistons you can use in a stock stroke, the kb167 hyper or there is a wiseco forged, both seem to give roughly 9.5:1 compression with a 63cc chamber head. There are a few more higher comp options in the stroker pistons.

What type if cam do you want to run in it, solid or hydraulic?

If you want to keep the standard converter and gears and run it as a std stroke 318 I think a nice hydraulic roller with smaller duration and higher lift than an equivalent duration flat tappet would work well with these heads. This will add to the cost of the build though over a flat tappet.