(quoted from post at 18:24:09 11/26/19) It has a stock cam and no head work.I did start it numerous times with a 320 CCA battery,I would like to know what I did wrong I am working on the engine now and would like to fix it.
Troubleshooting over the internet is a guess, but here are some steps that apply to any engine.
Check engine ignition timing, must be an accurate check. What do the plugs look like, light gray? Shouldn't be totally black or real oily and wet. Goes without saying, shouldn't be white with the tips starting to melt.
If provided information is accurate, static compression ratio is right at 12:1. As mentioned in a previous post, if the numbers are incorrect, comp ratio is unknown.
So, guessing it is correct, the 1st step would be to perform a compression check. Warm the engine up to operating temp, shut down, pull all the plugs, then with a good stout battery, crank the engine over rapidly and read the compression gage at its highest pressure for each cylinder. For a fresh engine all cylinders should be within 5% or less of each other. For a 12:1 motor, guessing cylinder pressure will be in the 225-260 psi range.
If pressures are very low or inconsistent, a leakdown test on all or the suspect cylinders can be performed. I use 100 psi, not the 30-40 recommended, it's much easier to listen for escaping air in the intake manifold, exhaust, or oil pan. Also look in the radiator for bubbling water. If not familiar with this test, find someone with a set of gages and how to use them. It's not complicated, need to back off all the rocker arms, pressurize each cylinder, comparison of input pressure to pressure a cylinder can maintain, should not be more than 10% loss, preferably not more than 3%. Will be able to hear escaping air thru either valves, going by rings, or seeing bubbles in radiator. Have seen a brand new engine where the valve seats weren't true and the valves wouldn't seal, valve job corrected the problem.
If those things check out, check camshaft health. Put a long travel dial indicator on the valve spring retainer, hand crank the motor thru a full two revolutions (do not crank with starter), write down max valve lift for each intake and exhaust. Compare to each other and the engine specifications. If they vary more than a couple %, there's camshaft problems.
If the cam checks OK, need to check what intake centerline deg it is installed. Should be somewhere between 99-104 unless engine specification says otherwise.
Eventually the problem will surface.