Lucky Me, Now What
I am the proud owner of a 70' slant six Dart Swinger w/48,000 original dry Montana miles. Car is almost showroom. I have moved back to dryer New Mexico and have come across aan old machine shop from the 60's that's still is in business. These guys are over-run by unmolested 383, 400, and 440 blocks nobody wanted. I mean literally, I have at least 30 potential builds staring me in the face. I'm pulling the 6 and opting for a stock sleeper 383 stroker of a most budget minded build, as I may buy him out on everything and go into business with him on some motors for stock looking sleepers, along with a few 400 based stroker racing motors. Anyhow, I'm dropping one of the many 440 cranks into a fresh .060 over 383 and porting and gasket matching a stock set of 452 hardened seat heads to the limits of about 300cfms or as close as possible. Everything I've read and understood from the research available says that the 383 likes being cammed at an advertised duration of 230deg @.050in with a centerline of 110-114 (112 to be sure). I'm sure this is going to get me a very streetable and conservative 500hp motor, but was wondering if this cam is helping the breathing capability of the heads and planned exhaust as well as it should. Does this combo sound under-cammed? Am I missing something? Seems like that if opening the heads, running the correct planned intake and header combo, that more duration and lift would be needed to optimize this package. Transmission and gearing changes aside, seems to me that maybe a stock 383 would be using the stock Mopar cam at this duration. Can you guys help me to think through this to form a more confident mindset about this? Thanks.