what solid cam is equivalent to a hyd 268 ?
I have done a compression reading Cold on the 273 with 160# on all cylinders . I have the thin .028 head gaskets also.
Wow, you've got 160 cold, with that 284? That's pretty awesome. But it's also gonna be a bit of a problem to downcam.How is that 160 even possible? Did you machine the decks or the heads,or back way off on the lash?
With 8/1 Scr and an ICA of 70*, your pressure should be like 115 or less and yes, that would make a pitiful bottom end, and with 3.55s, that's a serious mismatch.
So in my head something does not compute about the 160psi number.
But if 160 is correct, then your Scr has to be up around 10.6 according to my calcs. And if that's true, then you might be in a pickle.
If the 160 is true and the 10.6 is true, then going to the .039 gasket this will drop your Scr to 10.0, and that allows down to a 62* ICA, for a pressure of 162ish.And this will up your low-rpm performance by about 54%.
>But if you lashed her loose, and that 70* ICA was more like 65,then you could get 160psi with a 10.1Scr,and it still does not compute to 8.0 Scr, so IDK...
>But if the 160 is out to lunch, and 115 is more accurate, then you have a ton of room for improvement.Too many tons.The E-4 is a 260-260-108Solid,and in at 108,might boost the pressure to 126(at zero lash) and increase your low-rpm performance 25%
> But lashed to drop 4*, the ICA would be 54*, and now the pressure would be 130@ 8/1,for
a 30% Boost,EDIT; or 154 @9.0Scr for a 54% boost
So I don't know chit about 273s, so I guess this is better than a poke in the eye with a sharp stick; but I do know that 126/130psi is pretty poor.
So I guess if it was me, I'd find a second compression tester, warm it up,lash the valves, and retest the pressure at WOT, as many cycles as it takes to get two consecutive same pressure readings.
