Sixpack on a 318 engine ?
okay i stumpled aver this Six Pack and the price was right. I know a 340s would be cool but the only thing i have is a 318 which i plan to rebuild the cheap way. Hone it, , new rings and so on, a basic re reing job.
What you guys think, is it a bad idea to use the sixpack in this ? And if the answer is yes , what cam should i use?
Car will be a 66 Barracuda with a 904 automatic not sure about the rear end ratio. Converter stock.
As for camming it,
this will depend a lot on the rest of the combo, and specifically on the compression ratio/ cylinder pressure, but includes things like the convertor, tites, and, rear gears
.
If you are running an 8/1 engine, with an 039 gasket, yur already down under 8/1.
With the factory cam, that has an Ica around 48degrees, and at 900ft elevation, your cylinder pressure is already likely to be down around 130 psi, which is darn low.. ANY cam you install, with a later-closing intake, will only make this situation worse; the factory-stall convertor might/would have to go, as would any gears less than about 3.73/ maybe 3.55s in the early A; with bigger cams requiring more stall and ever higher gears.
But
If you are running a 9/1 engine with an 028 gasket, and the small closed chamber heads; well then, your pressure jumps up close to ~160, at the same 48* Ica. Now you have a lil room for a bigger cam. Two sizes bigger, going to an Ica of 55*, will get you down to ~150psi, about as low as I'd dare go.
Yes, at this pressure, you can run the stock convertor with probably any gear; but since the engine is out, I'd put a 2800TC in the 904, and run at least 3.23s. As for me, I'd leave the factory cam in there, and install some closed chamber 1.92 valve heads.
OPINIONS
>Notta chance would I install a cam with a later-closing intake, in an 8/1 318, and
>if you install 360 heads on that 8/1, with 340 cam, Well, the bottom-end is gonna feel like a slanty; Couple that with a factory convertor that is now down to stalling at 1700 rpm, and with 2.76 gears; pos
Been there done that, NEVER gonna do it again, I was such a DA.
>As for the 6-pac, sure, run it, after you get it tuned, it will be fine.
> if you make changes, always pay attention to the Quench.
> I'd put headers on any cam with more than ~30 degrees of overlap, unless the pressure is in the basement......