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Old 07-06-2009, 01:19 PM
Chevy21 Chevy21 is offline
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Well, I'm definetely going to have to do some more investigating because I know something is wrong. The motor is in an 86 chevy 1/2 ton 4x4. I know it is heavy but it wont even think about breaking the tires loose. It has a th350 with a 3.42 rear end and stock converter. The vortec's are 906 casting #. This particular cam is spose to run in the 1300-5600 rpm range. I can't get it to climb over 4500 rpm. We did verify true TDC and marked the balancer according to that, but yes it is an aftermarket timing pointer. However, we played with the timing quite a bit with no real change in power. When hooked up to a vacuum gauge it was pulling 14 hg. The valve springs I used are spose to be good to .550 lift. Could these springs be too heavy for the cam I am using?
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