[BG383]

Question: I have a crate 383 stroker (360hp/410lbs) on Sealed Hyperutectic Pistons(yields 9.5:1 CP, flat top, 2valve relief); GM Cast Iron heads (Valves: 1.94int/1.5exh)(72cc/170 runners)...Compressed Head Gasket of .041..Standard deck height..Comp Cams Hydraulic Flat tappet .477/.480 lift; 110 lsa; 224/230 dur. @0.50" Advertised Dur. 268/280. I want to run Aluminum Heads (preferable trick flow's, AFR, Dart) with 190 or 195 intake runners & 2.02/1.6 valves. What size Combustion Chamber should I use to keep a CP ratio of nothing greater 10.5. (Street Driven/ Maybe some Track car).....Thanks

[DaSouthWon]

If you want to keep the compression ratio the same, use heads with the same size combustion chamber. Smaller combustion chambers will raise your compression.

If your unsure what size combustion chambers the heads you have on the car now have, remove the valve cover and look find the casting number. It should be a 6-8 digit raised number. Go to www.mortec.com and match the casting number with the ones listed there. This should give you a good idea on what you have and what to replace them with.