this is all moot until the true Scr has been determined with the 302 heads
I think I mighta mentioned that right at the beginning of the post.
And I'm not talking thru my hat;
I ran my stock-cammed low-compression 318 (135psi) for six winters, several of them with the A833od that has very similar wide ratios of
3.09-1.67-1.00, and of course the .73overdrive. Splits of .54-.60-(.73od)
Every winter I ran it with a different rear gear, because I had them.
It ran pretty good with 4.30s.(3.14 in od)
It ran pretty good with an A904, a 2800, and 3.55s.
Did I exaggerate?
I don't think so; 2800 is already pushing 65% of the factory power curve.
But if I did, I'd rather be wrong in the right direction; cuz nobody likes a know-it-all that says everything will be peachy-keen, and then it isn't.
That cam will have to be buzzed up to get out of reversion, probably, and guessing around 2200. And until that stops, it will be pissing pressure back up into the intake. That's just the way it is.
Stock pressure at ~500ft and with a true 8/1 Scr is about 137psi.
What's it gonna be with the Whiplash. Nobody knows cuz Hughes won't publish the numbers.
But I can guess based on some of their obsolete cams numbers.
At an Ica of 55* we're looking at 130psi At 8/1Scr.
By 7.5/1 the pressure has slumped to 119psi
If the Ica is 60* and the Scr is 8.2 say with the 302 heads, then maybe 129psi.
It doesn't really matter cuz the numbers are all very low.
But suppose you get her up to the max suggested by Hughes, 8.6 and are willing to run best pump gas at 484ft elevation. And say the Ica is only 58*, then you're back up to 140psi, and you know how that runs, cuz that is pretty much stock.
Now, the power will pick up after 2000/2200; slowly marching to the peak that comes around 4600 or perhaps a lil later. With a shift-rpm perhaps as high as 4800...... which with 3.23s and 26s comes at; 37mph in First/68 in Second/115 in Third.
When you shift at 4800; the Rs will fall to;
2650@37mph into Second; and to
2820 into Third at 68mph;
So that doesn't look too bad....
But OP has stated that he's not interested in making power ............ so why is he shifting at 4800? He won't be.
I choose a more realistic shift point of 4000 for this exact reason; because it's more representative of how the OP is gonna drive it, and so then more representative of what the OP can expect.
I guess we'll see.
