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I just installed a comp cams .230/.236 duration, .562 valve lift. Springs= Eddlebrock 5767 which are recommended for stock heads. I had the heads rebuilt (D3VE), then I ported the exhaust. Timing chain is a 9 position. At the zero mark my number was 108 for intake lobe centerline, 106 is specified. Setting timing 2 deg advanced my centerline is 105 deg. Regardless, my piston to valve clearance is .022 intake and the exhaust hits before full lift. Pistons are SRP .015 below deck with eyelashes. I painted the eyelashes with a sharpie, put on a head, gently rotated the valves to make a light impression, seems like they are positioned correctly. I quadrupled all my procedures including checking intake valve timing @ .006 before and after TDC. Both are reasonably close. Does anyone have any insight into the Piston to valve issues?
A handfull of years ago I ran an eddlebrock RPM cam (234/244), stock valve train and the above springs and was able to wind to 6,000 with no problem although this was with a different set of stock heads. Why these issues with a smaller cam?
A handfull of years ago I ran an eddlebrock RPM cam (234/244), stock valve train and the above springs and was able to wind to 6,000 with no problem although this was with a different set of stock heads. Why these issues with a smaller cam?