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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.

I apologize for not reading closer.

Let me say this about what you wrote: not sure on the pro comp heads. Didn't like the BB heads I have done but they are ok. If you spend the time on the intake manifold (most guys skip over this but it is a big deal) and get it correct, and your headers are good 550 is not out of the question. 500 is 1.47 HP/CI so it needs to be properly spec'd. 550 is 1.6 HP/CI. You will have to have you crap wired tight to get there but it is doable.


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

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