CVO Technical > Twin Cam

103 screaming Eagle heads piston options

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johnsachs:
What compression did you end up with ? ;)

HD Street Performance:
I have milled the heads further which forms a perimeter squish band which required intake flange faces to be cut on the heads. These engines had about 8.3:1 compression with a flat top piston from the factory. On other builds I have used Arias pistons that can be purchased from CP that fit the chamber and even regular domes for the bathtub and they work as long as checked for clearance to gain compression. On a few occasions I have even welded the chamber sides and made kidney shaped chamber similar to the water cooled heads on the 2015 models. Respect to John Sachs, he is a good builder and knows these engines well also.

69shovelsled:
How much could I take off the head to get around 10:1 compression? Thanks I was going to just run the pistons but he acted like they wouldn’t work. Honestly I’m over this build it’s been plagued from the start. I’m probably going to just bolt it together I really don’t give a chit anymore.


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69shovelsled:
I think I’m going to take .060 off the head like John said because the cam I’m running needs compression. Needs 10-10.5 somewhere in there. I have .030 head gaskets and the piston isn’t quite flush with the cylinder.


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HD Street Performance:
Have patience and act logically. These engines actually have good potential. Sometimes a little help from a shop is smart to help these projects win.

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