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Basic 318 upgrade.
better cam, small 4bbl carb, good exhaust.
Anything more is ridiculous on a 318.
You want more cubes, don't fool with stroking a 318, you are just turd polishing. Might as well stroke a 360, about the same cost, more cubes, better bore sizing, better choice all around and a virtual bolt in for a 318, a couple of minor issues to deal with.
Well... turdly 318's are avialable usually for free..... a 360 block gives you 408 cubes which is 18 more than the 318 stroked to 390. For any given combo assuming you make 1 hp per cube or a little more you are looking at about 20-25HP less. Does that make it a turd? Is a chevy 383 stroker a turd??? SBC 350's stroked to 383 are probably about the most common stroker combo on the planet and Chevy guys love them. Yet the Mopar crowd seems to turn up their nose at a 390? I just don't get it.
A 390 can be built very cheap. 4" cranks can be had for $325.00 Cheap Eagle SIR rods for $250.00 KB forged pistons for $395.00...... So the reciprocating assembly can be had for less than $1,000 and a 318 stroker with the Eagle rods will not need to have the expense of having the block clearanced. All this can be internally balanced by drilling the counterweights with no expensive mallory metal like the 360 based combo's.
Yes the 3.940 bore is somewhat smaller but there is no problems running even a 2.02 intake valve at all. My 390 uses EQ magnum style iron heads with 2.02 intake valves and it pulls like a big block. TBF
71 Challenger 528 Hemi project
09 Gr Cherokee 5.7 hemi in da house!!
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