Lifter problems????

That's what I meant... Sorry I wasnt as clear as I should have been. Smith Bros and Manton can custom make them. I've been able to find the lengths I've needed using Comp Cams in the "Hi Tech" line. If the rocker shafts were not right, or the cam bearings are not lined up properly in the cam bearing bores, the top end oil supply could be reduced or cut off totally. The priming shaftwitht he rockers in place will tell you, but like he said, it only feeds one bank of rockers at a time during engine rotation, so you have to pull the spark plugs, and have a buddy turn the engine over while you are priming with a drill. If you dont see much oil, pull the rocker shaft assemblies off, and try again. (careful, very great risk for a huge mess if the oil pressure and volume are good...lol) if you still get little or nothing, I'd pull the cam and check the bearing alignment. It can be off on the holes leading to the cylinder heads, or off on the holes leading from the mains up to the cam. I've had several small blocks where the oil holes were not perfect, and I had to buy a second set, modify them, and install them properly.