71 340 Compression Test

1badfish67 said

Some things look god on paper but just don't hold up in the real world. I am going to change out th cam and go with something like a 280H/.480"-.480". I think that is about two steps up from the factory cam at about 268H?

Thanks for the info on the forged crank and balancing. What is the damper that you are referring to? Is it the weight on the front of the crankshaft?

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Yes, the damper is the crankshaft vibration damper behind the crank pulley. The forged one is inherently balanced, and the 340 cast crank one is purposely imbalanced; that imbalance is essentially a balance weight for the crankshaft that is external to the crankcase.

I am wholly with AJ on the cam, going wider duration with low lift is about 4 decades old cam design and more suited for strip than street. Going with smaller duration and as high a lift as you can get will keep the cruise manners better. All wider RPM, good-cruise-manners cams have been this way for a long time.

I personally would go with a mild turbo or stroker over nitrous.... just my preference. The engine will be more broadly usable with either IMHO.