500, 472, 425, 368 Discussion, Gave my 472 a quick physical today in Cadillac Engine Technical Discussion; Did have a chance (finally) to do some general tests on the engine. I found the engine serial number and ...
Did have a chance (finally) to do some general tests on the engine. I found the engine serial number and fortunately it matches the VIN number on the car! Vacuum level is good, about 22 inches, but the needle is not completely steady. It bounces pretty good but only within about a half inch of vacuum. Did a compression test, one cylinder is 137, one is 145, three are 150, two are 155 and one is 160. Oil pressure is 30 to 35 warmed up and at idle. I also found the primary throttle shaft on the factory quadrajet has a bunch of slop it.
So it appears the bottom end is good (or as good as can be expected for a 43 year old engine), but either the lifter(s) or the rocker arms are clattering quite a bit. Before I bought it, it only had 10 miles put on it in 12 years (or so the repair documentation says). I'll do further investigation on the clattering as time permits. I'll also check the cam timing gear too. Maybe, it just needs a set of ported MTS heads, ported factory intake, a carb rebuild, an MTS #10 cam, new lifters, a street roller timing set and shaft rocker assemblies. I think after all that, I'll be good to go!
Yes, it probably had the nylon coated timing gear set, and I'm sure the bottom of the oil pan is full of those nylon chunks! With a new timing set and a rebuilt carb and basic tune up, it'll be good for a long while!