just tuned in my new upgrades, 4000 s/p, new sp1, and points to electronic modual, also got the carb adjusted so the secondary open right away when i nail it!!! my vacumm is at about 11-12 inches of vac at idle, 900rpm,im running the 113a cam, WITH 232 INTAKE DURATION, IS THIS GOOD AND WHAT DO YOU THINK IT MIGHT DROP TO IF I GO TO A LITTLE MORE CAM, SAY A 238 INTAKE DURATION AND 112 LOBE CENTER? OK THE 290-08H. ALSO WHAT IS THE LOSEST YOU CAN GET AWAY WITH ON THE STREET?
11" Hg would be low for a stock cam, but as you say, this ain't a stock cam and you can't expect it to act like one. The more agressive the cam, the more you can expect to lose vacuum. The only thing that might be a problem is vacuum assisted safety issues, like power brakes. Unless I am mistaken, 7 or 8" Hg should suffice.
Kelly, If it's the Poston 113A cam, they describe it as being designed for those who want to run the most cam possible with A/C and 3.42 gears. If you want to run power brakes, I'd leave it the way it is.
My breaks?do you mean my brakes?if so they are borderline its probably the last cam to be able to run power brakes. Thanks
i think ill go to the 286-08-hl, just has 334 intake duration, and has the lift ill need with my 1.54 rockers,imgoing to stay away from that 338#
Sound about right to me. I get 10 to 12 inches with a p113 cam. Going to a TA413 but going to run Rhodes lifters to make it more streetable.
I used a 255* 265* cam with power disc brakes,o No: no problems at the track slowing down from 110+, or on the street. I kinda expected problems too, but never had any. I wasn't making very much vacuum either.o No: :gt:
I wasn't trying to recommend THAT cam, just saying that it worked OK for me. I don't have ANY problem with low end torque either with 3800 stall and 4.10's:Brow: Fuel economy now, that's a different story!ou: :laugh:
Most of the bendix boosters become completely ineffective at 6" of vacuum, 8"-9" on the street is about as low as you can go (safely) without intermitently loosing the power assist.
