High Compression 390

The problem with most camgrinders is that they do not understand MOPAR or long rod motors
it's not just the lifter diameter
a 4" stroke SBC spends more time around BDC so when the intake closes or exhaust opens is not quite as important as it is to a MOPAR- you have more leeway with a SBC and you need it because the lifter is smaller
On the top of the stroke you have longer with the long rod engine- you do not have to open the intake as early and you can close the exhaust earlier- you want less overlap and shorter duration (and with the smaller lifter you have to have longer durations and more overlap to get the valve moving to match the cylinder demand
does that make sense?
so look at your camgrinders catalog
If they recommend the same grinds and timing, LCA etc for a 1.5 rocker SBC and MOPAR they are obviously not doing the MOPAR any favor
and since many do not know what they are doing then you, the mopar professional, have to spec
or use a program like the Controlled Induction software
very few shelf cams for Mopars- sorry
I've posted up a couple of MOPAR cam lists from my database
one is for Factory and Direct Connection/ Mopar Performance cams - in duration order
Direct Connection Cams
the second I called B/RB cams but it basically a lobe list so the lobes are available for SBM also
There are sections that compare with CRANE and the BIg Detroit grinders that use the SAE- .004 advertised notation
and another that compares with the popular .006 method (Comp, Lunati, Howards etc
The DC page uses .008 which approximates the factory method
B/RB Standard Cams

The drill is to pick your rpm range - which gives you a target duration and target dynamic compression then pick an intake close and mechanical compression ratio
If you already have pistons and a fixed mechanical compression ratio you can use the list to maximize your torque