5.7L Hemi, 1968 Barracuda.. Opinions.

I dont want to hijack the thread suffice to say you'd probably find some chassis dyno time very "revealing".......not so much as far as making huge hp increase from timing adjustments....but the AF mixtures might yield some interesting results.

BTW ..that MSD "base tune" is a little suspect I reckon.

They have the MAP chart pulling timing off the mechanical total timing when MAP reaches 11 psia.

I understand the principle of the MAP adding timing at low pressure and reducing as MAP increases under Wot.....like a vacuum advance........but I dont get why the MAP chart goes into "retard" at 11psia.

In my mind it should just "zero" ....at high MAP.....not start yanking timing out of full mechanical advance.

Check it out on you PC ...you'll see what I mean....