Cam swap without pulling motor
Check out the flow curve below. Test 646 is before surfacing. Test 655 is after surfacing. No other changes. I am beyond shocked. I keep looking for some testing error that I have made like leaving the spark plug out. Can't find anything. Short side shrouding is gone and I suppose some shrouding on the cyl wall side. But 30 cfm?
You might be correct. Here's my thinking. The nail head valves are much flatter on the chamber side. I hope to measure tomorrow but it looks like 3-4 cc will be removed from the chamber with the new valves. I'm hoping to get around 9:1 or slightly higher. This is turning into a mild performance build as well. RPM Air Gap manifold and headers going back on. Now shooting for 230-240 with additional porting.
Check out the flow curve below. Test 646 is before surfacing. Test 655 is after surfacing. No other changes. I am beyond shocked. I keep looking for some testing error that I have made like leaving the spark plug out. Can't find anything. Short side shrouding is gone and I suppose some shrouding on the cyl wall side. But 30 cfm?