70 318 with 340 internals/Cyl Head

mario03srt said
So the answer would be.............323 cubes..........

Yes

mario03srt said
possible very low compression,

Yes

mario03srt said
better crank (good for 5-7 psi?),

Good for 5-7 psi? On what? Changing the crank material is for strength. This adds no LSI anywhere on anything!

mario03srt said
could possible bored to have a 340 piston,

I call BS on anyone saying a 318 can go to a 330 bore size.
That’s 3.91 to a 4.04!!! That’s .130 over. I do t think so!

mario03srt said
if not would require decking and/or some upgraded pistions to run well.

Depends on the target of the build. You can have a fine running engine @ 7.5-1 ratio.

mario03srt said
Better flowing head than a 318 stock piece with 2.02/1.65 valves.

Let’s do some math here. 3.94 bore size, 2.05 + 1.60 = 3.65 which leaves .029 to have clearance for the valves to operate.
Ummmmmmm, not a great idea.
Besides, in all honesty, I HIGHLY doubt you’ll need a 2.05 valve in a .030-318.

mario03srt said
Is this recommended other than the comp concerns?

What is your concern specifically?

mario03srt said
Not asking for hp estimates, usage projections, convertor sizing, DCR, etc, etc, etc.

Roger that Sir!

mario03srt said
It is what it is. It in the car. Here is a photo. Basic SBM. Some may be able to id the head, not me. That will happen Wed's and I'll have a comp gage in hand.

The engine below looks good. Headers looks like standard 1-5/8. I still can’t tell what intake that is though.

mario03srt said
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