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The cam choice dictates the compression. The chamber volume is dictated by the compression, relative to the displacement. There are variations of trading dome or dish volume for chamber volume but in the end, it has to be set to a net cc's to achieve the desired compression.
I agree with Larry, for a reasonable street motor, a flat top piston is hard to beat with a small-ish chamber. The problem is, with the 76cc chamber and the Wood TW6, your compression would be over 11:1 and the ccp is 217 psi. Why not use your stock heads and have them modified to work? Roughly 85-86cc is what you need for that cam.
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'05 FLSTCI - Cobalt Blue w/ Candy Flames [custom paint by VonRaknid]
Chubby WO515 Bars - 18" Fat Daddy 50's w/ ME880's - GMA Brakes - Baker DD6 - 95" w/ SE Cast Flat Tops - Street Ported Heads 9.9:1 CR - [Engines by Otto] - Andrews 37G - 1.675:1 Rockers - Dakota Kid Delphi TB/Intake - SERT tuned by Otto - RB Racing LSR 2:1 - 96hp/106tq
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