k56 in my 383

[73-charger-383]

Hi, I've got a 68 383 that was originally a two barrel.  I replaced it with a factory four barrel intake with a edelbrock 650 cfm carb.   I've also got a set of 906 heads that i've ported via the mopar performance template, and am running an electric distributor with an accel super coil.  I've also got 1 3/4 headers on it.  -My first question is....from what i understand the two barrel 68 383 was lower compresion that the four barrel --how much will i have to shave the heads to bump the compression up to 10.5-1.  (forgot to mention is the original pistons still).  Also, the rear is 2.7.1's which i know will suck the big one as far as quarter mile action.  -what would the engle k56 act like with this set up??  If i need to replace the rear gears, can anyone suggest a good ratio for a street daily driver??  Thanks alot guys.

[dodge freak]

Gears 3.23 -3.55 depending on how tall your tires are and how long and fast you like to drive on the freeway. If you drive 75-80 mph everyday for more than 10-15 mins get the 3.23 if you not on the freeway to often or drive 65 mph get the 3.55. The more gear the quicker it  be on the 1/4 mile so it matters. I have 3.91's but am on the freeway for only 10 mins 1 or 2 times a week, I love them, yes the engine sometimes revs alot but so what, I have  great valve springs and spark box and it keeps going and going and well until I need more gas. Wasn't too bad till these last 2 years but I think I am still doing better than the guy who paid $30,000 for his car that gets 30 miles to the gallon and I am the one out in front too.

[Chryco Psycho]

you cannot shave the heads enough to get near 10:1 compression , your best bet would have been to use closed chamber 516/915 heads , too late though
use the steel shim gaskets & the K56 Engle , the short overlap on the Engle will build compression over most cams & you will have lots of power , if you are using the stock iron manifolds get the cam ground on 112 CL , go 110 with headers

[73-charger-383]

quick question......willl 342 heads work on a 68 block??  how about the old golden lion heads?

[Duey]

quick question......willl 342 heads work on a 68 block??  how about the old golden lion heads?

73, do you mean either 346 or 452 heads?  They all have the same bolt patter...516, 906, 346, 452.  Just plenum config and the closed-head vs. open head config (well, the factory hardened seats of the 452's).

Cheers,
Duey

[694spdRT]

how about the old golden lion heads?

I think the early golden lion heads had a different rocker setup that the later heads. I doubt they offer much performance wise and wouldn't use them if they did work.