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[email protected] x 3.375, dimensionally, is just a big bore 318(3.91 x 3.315); but carrying a bit of extra weight.
You can make your 318 into a 390 pretty easy and cheeply, and only you will know it. The extra torque at low rpm will be well worth it. Put some alloy heads on it and crank up the pressure, and you'll forget all about the 383.
Or leave the 318 at stock stroke, but install an A500/518 with overdrive and LU, and some 3.91s to 4.30s in the back...... which is what I would do......
Even if the 318 is a lo-compression oil-burning pig, those 4.30s are gonna level the playing field.
I can't believe all the 318haters coming out of the woodwork today.
lol.
