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Just some old info...Used 44 x 36 valves (SS) Chambers at 48cc , 0 deck, Elring gasket, ARP head studs.
Car doesn't idle well, and diesels on shutdown...I asked Dema Elgin about your chart, and here is his response:
Hello, The int closing point is about 70 degrees at the valve!!! You seem to have some sort of a tuning problem. 274 total duration with 108 lobe centers = 58 degrees of overlap at the CAM and timing of 29-65 at the cam. When the cam goes through the rocker arm the valve timing is increased!!! Make sure that you do not have the valve lash set too loose for that will affect the seat to seat timing. We have a lot of the 68.508-16 cams running on the street with NO problems. The 7-1 effective comp is with a int system that has no restrictions like what is on many high perf engines.For some reason people DO NOT understand that DYNAMIC comp is when the engine is producing max TQ not just calculated compression on the engine stand with the int valve closing. The tightest lash hot can be in the range of .012"-.014" and if you were to check to see when the int valve closed it would be past 70 degrees. Dema Elgin
HAVE YET TO READJUST VALVE LASH, INITIAL SETTING WAS .015 COLD
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