Great build thread! I recently purchased a 68 swb with a 300 and three on the tree, engine had a bad headgasket so I pulled it yesterday, hopefully I can finish disassembly tomarrow and send it to the machine shop. This will be my first build and your post have offered great info! Maybe mine will turn out as good as yours. Is their anything in perticullar I should be aware of as far as replacement parts or recommendations on upgrades? It's just gonna be for joy-rides and make ppl remember how trucks ust to be made
Glad you found this helpful! I honestly learned a lot about these engines during this build. I can tell you that for starters Offenhauser claims over 100hp gain from stock figures by installing a 4 barrel carb, manifold, cam change, and header. I went with the split efi manifolds from the FI engine just because they flow great, fit nice, and I hate headers. There is a lot you can do to help it breath (bigger valves, clearancing around the exhaust valve, light porting, etc). You just have to figure out what your end goal for your engine is and do what you feel necessary to get you there. I wanted big low end torque, so I left the valves alone but opted to de-shroud the exhaust valve and did a lot of smoothing in the ports. I also used pistons to bring me up to 9.0:1 cr and got my quench down to ~.038 (using a .021 copper head gasket) to help fight spark knock. Last I advanced the cam timing, which boosts low end. If you want yours to rev past 4500 rpm, you'll want to do things a bit different. I just want to be able to pull the heft of my 5500# truck plus an occaisional load, so big torque was my focus.