Quote:
Originally Posted by MescaBug
The Melling SPC-8 is not the best 'clone' out there... Its quite different actually. I have a Lunati 10703, its much closer to the real thing:
041: 308/320 - .470/.470
SPC8: 304/315 - .469/.469
Lunati 10703: 308/320 - .470/470
They all have 231/240 @ 050. The ICL is 112 for both the 041 and SPC8. The Lunati is 109...
The LSA for the original 041 is suppose to be 113.5. But I've seen it listed @ 114-115... The Melling SPC8 is far from that @ 112. The Lunati is 113.
Next thing would be to compare the valve events.
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The SPC-8 cam is the real deal according to Jim Hand.Your advertised duration numbers listed for the SPC-8 are 304/315 which is correct, but these numbers are taken at SAE Spec@(0.06/Rocker Arm Ratio)Cam lift.If the numbers were taken at .004 tappet lift the duration might be 308/320.That is why it is hard to compare advertised durations, different cam companies use different lift values for advertised duration.Lunati does not state what lift value they use to get there advertised duration numbers.That is why most people concentrate on duration at .050 inch of tappet lift for comparison.The Melling SPC-8 LSA is 113.5(int c/l 112+exh c/l 115=227 227/2=113.5) not 112.