Re: 396 how much hp?
Without any more info if the timing/carb were dialed in correctly i would est a realisitc poss somewhat conservative 390-400hp+/430-440 lbs trq with the cam /headers/carb/intake/etc your running,could even be a few more hp then that.
The 331 geard 12 bolt will be much nicer then the 308 geard 10 bolt your currently running,it should feel much considerably stonger with 331 gear. I went from 307 to 331 gear with my 12 bolt & with my slightly milder camed 396 with approx 360-370hp/420-430lbs trq it felt considerably stronger in the old BUTTOMETER with the 331s then with the 307 gear with the m20 i'm running.
Even though it was a farily small step up in gear from 307 to 331 it was a nice surprise because it felt like the motor got an additional 25-30+hp from somewhere when it really didnt and with your hotter motor/setup esp with more cam & headers you should feel a real nice perf inc when you get the new rear with 331's installed.
Get back to us after you get the 331s in the car to let us know how you like the perf inc the 331 has over the 308 your replacing,before and after time slips too if you race it at the strip.
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2006 YAMAHA 1700 ROADSTAR SILVERADO (1 owner ,GOT in 2009,4,700 miles/WK end fun)
1977 KAWASAKI KZ1000 (AM ORIGINAL OWNER ,GOT IN 1977,NOW has 29k miles/WK end fun)
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
Last edited by SWHEATON; Aug 19th, 08 at 1:33 PM.