Did a Bit of Tuning Tonight.....

Burntorange70 said
I live at around 4000ft and some times my Dart acts up on me above 3000 rpm. I put a carb spacer on it and it has not done it sence. It has allways run good down the hill though. One time I was down the hill running at 5500 doing 120 mph. But up here in the hills it acts up some times. Sorry I have not found out why yet. But for some reason the 1/2 inch open Penolic carb spacer has been helping so far. I need to reajust the carb because I now have a stumble off of idle now. Back to tinkering. LOL

I had a LD4B manifold on it previuosly with a 1" alum open spacer. Great manifold but the carb would boil over on "bumps". Same problem though....layover @ 4800 rpm and snap, crackle, pop over 5K.

BTW, a phenolic spacer is in the works to solve the splash/boil 4x4 problem I was having. :)

camd64 said
hmmm. I am by no means an expert but i would think your open spring pressure should be closer to 350 or 360 @.500? last chebby we did was .510 and I seem to remember them being somewhere around there. with the 1.6 rockers that puts you a little over .500 lift so maybe you do need the stiffer springs. I have the same cam in my 318 but with 1.5's and it will pull up to about 6,000 r's till its out of breath. are your springs number 69308-1?

I'm sure I could dig out the receipt, but it was a Crane single spring with a damper for a Crane 218/228 cam. The Lunati recomended true dual spring is much closer to 350 lb. :) And yes, you are correct, the lift of the lunati is .506 on the exhast side and .484 on the intake with a 1.6 rocker..... By no means a radical cam and I'm thrilled by it's performance and torque in a street driven full time 4x4. :)