Hi, I have a 68 s motor that has been completely rebuilt. The engine has not loosened off after being started a few times, and idles ok. However when the engine is turned off it spots instantly. Is this common in newly built engines? I am expecting not. The engine has a reduced weight flywheel but I suspect this is not a material factor.
There is good oil pressure, and both banks are wet under the rocker covers ( near side is dryer than the far side)
Currently looking to pull engine back out again
Grateful for opinions, other shared experiences