KartRacer89
Member
I bought a used but good engine from a guy in person a while back, I'm finally getting around to building it into my own. The engine came with a stock rod and 98-3 cam, so I'm guessing this was a plate motor. Anyway I bought some new valves and billet 1.6 lifters, I'm using a 043-073 cam which calls for 0.003" clearance on both valves. I got the intake valve set where it needs to, but every new exhaust valve I put in and check clearance on ends up being 0.012" or more. The cam isn't worn out and the lifters go up and down smooth, they both sit on the cam lobes. The valve seats aren't very worn either. I checked the lengths of my new valves and the new ones measure 3.85" and I measured my lifters, which are dead nuts 1.6 inch. Whether I have the cam and crank timing marks aligned, or the piston at TDC, the lifter sticks into the valve spring box an 1/8" or little more, unsure if that's what I should see sticking out? I've been following Jimmy Glenn's "Building a Flathead" thread to help guide me and it has been very self explanatory and helpful, except I've got too much valve clearance and unsure how to correct it. This engine is going to be run in sanctioned stock class racing so would very much like to keep within tech rules.
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Thanks and God bless,