Thread: 72elk

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Have you called Comp and asked them yet?

Been talking with comp Cam and found out that the springs were supplied with the wrong retainers for my application so I've ordered their recommended retainers and locks. I also asked there tech group what Cam they would recommend their response was Cam kit k12-423-8 502/510 lift, 224/230 duration @ .050 on a 110 lsa. I would really like some comments on this Cam from you guys that understand this stuff better than me. I will be running 4.10 greats.

Just checked out the Cam kit....don't need all the parts ant too many $$$$. What about the specs?

Originally Posted by States

What about the specs?

That cam will want a static compression ratio of about 10.00:1. Current thinking is that an iron-headed street motor should be capped at about 9.5:1 because of the propensity of pump gas to detonate with iron heads. My thinking is that if you carefully de-burred everything in the combustion chamber, on the piston crown and the spark plug electrodes and threads and used a fuel/air ratio sensor in each collector of the headers to set the proper fuel mixture, you could probably get by with the 10.00:1 static compression ratio on pump gas with no detonation. You would also need a tight squish/quench of 0.035" to 0.040" to create turbulence in the chamber just as the spark plug fires.

The cam is one of Comp's Extreme Energy grinds. I personally do not care for this technology, but some fellows are OK with the noise generated by the extreme ramps. With the 110 degree Lobe Separation Angle, it will be difficult to create much intake manifold vacuum for power brake operation, if you have power brakes. Power begins at 1900 rpm's, so you will need a minimum of 2,500 stall in the torque converter.

My best guess is that you told them you wanted a lumpy idle and this is what it costs to have a lumpy idle. Everything else has to take a back seat.

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