Here is my situation. A buddy of mine sold me a new set of Speed Pro forged pistons, minus one piston for only $80.00. Like many here, I was seduced by the idea of paying so little for a brand new set of pistons. Any way, the part number listed in Jegs is L2252AF. According to what is listed, these are 60 over 350 pistons with a 11:88:1 compression ratio with a 64cc head. In my conversations with friends, we are speculating that with a 76cc head, the compression ratio figures to be more in the range of 10:1.

Now for my questions.....#1) Is it reasonable to think that I can get the compression ratio down enough so that I am able to use pump gas. #2) With these pistons, what recommendations can you offer as it relates to building as stout a street motor as possible. In other words, what cam/head combinations would you recommend that would afford me the most power potential. I dont need anything too radical....just your basic 400hp thumper for the streets. #3)Is there anyone out there that wants to make a complete build recommendation.....perhaps sharing your engine specs as a guide for me to suggest to my builder. I do believe that there is plenty of value in following the path of others....so please, feel free to share what you would put into this motor if it were you. This time around, I want to stay below the 5 grand mark and perhaps get a budget build for around 2-3 grand.

Thanks a lot..............

If the 11.88:1 number is correct for 64cc heads, it should put you at about 10.25:1 with 76cc. You should be able to do what you want. I would ask Harold for a CAM rec. The Voodoo Lunati CAMS are nice for the street and heave a great sound. Something in the neighborhood of 235º to 240º @ 50 should be OK. Use Pat Kelley's DCR Calculator to zero in on a CAM that will work. Your goal of 400HP should be an easy mark to achieve with those pistons.

Troy.

Can the domes be fly cut to reduce the dome volume?

J,
The Speed Pro book says 10.25 with a 76cc head & .035" deck hgt. The biggest problem you may have is finding a matching piston if the set you bought is very old. The newer Speed Pro pistons are a lot lighter than the old ones.