I am thinking about building a 30 over 340 "big" motor to have as a backup to this 318, and perhaps at some point replace it

I have access to a nice standard bore 340 with its unturned steel crank, bunch of stuff I wouldn't use,( stock rods and pistons)several stock 340 pans, timing covers, etc for real cheap.

I just wondered if say cnc procomp heads, moderate roller cam, zero deck flat top pistons could make 550 horsepower or better? Or any other heads, that are cheap and available
If not it wouldn't be a significant enough upgrade to be worth doing.


In my old age I am actually back into thinking Dusters/ Darts/ Demons with 340's in them are cool.