Making power out of the 318

carmart1975 said

so really if i was to get a 5.9 mag put a good cam in it and did some head work i would be in the 400 range thats from what i have red

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Here's a dyno of mopars 380hp crate engine which is a stock long block with cam is 288 intake, 292 exhaust duration, and .501/.513 lift on 108 something like 230/235 @ 0.050" and M1 single plane. 750 and headers. Makes 409 hp @ 5400 rpm / 440 tq @ 4100 rpm.

https://www.motortrend.com/how-to/mopp-0303-360-crate-engine-buildup/

Mopar Performance 360 cid 380 hp rated