Same as any other build. I believe the S&S motors come with 40 HG's. You can run a 30 there and mill the heads. I've not had a set of these worked heads in my hands yet so I can't say of sinking the valves is required or not. I believe in stock from the heads run at 91cc chambers and with the higher lift cams used with these heads, some geometry correction/valve stem protrusion may need to be addressed as well. Again, on these particular heads especially, I'd call John Sachs. He knows these heads well and for the guy running the boost, I would not go crazy with the CCP or compression since you are running the boost. I would confirm with Sachs but I'm sure he's going to tell you to at least go with a 2.02 intake, possibly larger and maybe larger intake valve or if you don't mind spending the money, a set if worked B2's may be the hot setup for you. If Sachs isn't who you'd like to use, Dorfman at HD Street Performance or the Lazanno brothers would probably be on my short list as well. If the compression you want can't be achieved with the HG and shaved heads, next option is pistons or possibly oversize bore and pistons. I know S&S has recently released some new kits that contain CP pistons. I use both Wiseco and CP just depending on the build. I just finished up a 106 build that started life as a SE 103 with the hemi chambers. Sachs did the heads and suggested the Wiseco's so that's what I used. When wise men speak (Sachs in this case) men who hope to eventually be wise, listen. I actually like some of the main features of the CP's better (ie skirts, rings, and ring lands) but Sachs suggested Wiseco's on this one and that's what we used. Tuning with my 4 gas analyzer, I can see how efficient heads burn and although I have not had time or a chance to share my readings with Sachs from the tuning, the heads burned exceptionally clean and there was no oxygen (0.2%) and very low HydroCarbons (Raw fuel) that made it through the engine unburned. That oxygen reading and no pinging is nothing to take lightly. It is not very common to be able to burn up that my ch of the oxygen we introduce into the engine without the knock sensor start pulling timing and start audibly hearing ping. That said, of course the other components are players also (ie throttle body, pipe and cams) but the heads were beyond the shadow of any doubt were very well done.
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Topic: 124 s&s engine 585-640 question (Read 33727 times)