Bummed Out ! Valve to Piston to Close !
I'm near the end of a 454 build and (project 454) and was really surprised and disappointed to discover that I only have .015 to .020 clearance between the piston top and intake valve at aprox. 10 degrees ATDC. I am going to put the degree wheel back on and double check my cam timing, but I installed it straght up and it checked out almost exactly to specs. Heres my combo if any one has any suggestions. Stock BLock -.025 on the decks, Stock Crank, Stock Rods, TRW 2465F Pistons I think they had a 25cc dome, .041 Gasket, 049 Heads -.015 with 2.19 Intakes. Pistons are .005 below the deck. Unless I've overlooked somthing, my theory is the combination of the larger valves sitting up higher in the chamber and the milling of the heads and the deck has created the problem. The cam is a Crane with 226/236 degrees duartion @.050, 112 degrees lobe seperation and .534/.553 lift. I never guessed I would have a problem and the worst part is Ive installed and tourqed the heads with new Felpro MLS gaskets ($85.00 each). I think I will have to pull the heads and sink the intake valves. Any other suggestions or help would be appreciated.