Gofish
Well Known Member
I’ve got a rebuilt, never-fired 348 with some interesting parts. The basics are the 3755011 block, 9.5:1 pistons, but the valves are giving me a big question. The heads are 379 and 256, but they both have 2.06 intake and 1.66 exhaust valves (as I measured them while installed). Everything I’ve read says the valves should be 1.94 and 1.66 from the factory. I’m guessing someone had the larger intake valves added somewhere along the way, but if so, why not the exhaust valves too? Any thoughts or corrections?