BriancWS6

iTrader: (18)

I know on the older vehicles a larger duration cam makes the brakes not as responsive, I haven't heard anyone with a LS1 complain about low vaccum and poor brake performance after a cam swap, but I thought someone could enlighten me. Cam going in is TSP 225 225 .589 .589 on 112 if it matters any. Thanks

felton316

No, you should have no problems with your brakes at all with that cam.

bad2000ss

iTrader: (6)

I don't think you should have any problems. When it comes to older motors, in my experience its not so much the camshaft that causes a problem, but where you are actually drawing the vacuum from. The cam in my truck is in the 232 duration range with .500ish lift. When I was running a Demon 750cfm in my truck, stomping the breaks would kill the motor. When I switched to the manifold port for the vacuum I had no issues at all. The vacuum port on the Demon carb was on the front side of the carb between the primaries making the problem worse. After switching back to the edelbrock with the vacuum port in the back of the carb (secondaries) I could use that vacuum port without problems.

I think since the LS1 draws vacuum for the brake booster from the back of the intake manifold you won't have any trouble. If you were to pull vacuum from the throttle body, you make have a bit of trouble. I have never read on this board anyone having problems with the breaks or motor related problems because of the breaks.

JoeyGC5

iTrader: (24)

I've got a simular cam (224/.581/112) and see about 14" of vacuum at idle. If I was you I'd start looking for vacuum leak/ broken fittings or boots/ and loose hoses.

BriancWS6

iTrader: (18)

I don't have any brake problems. I was just wondering when I install my cam if I would then. The reason for this post is a buddy of mine has a 92 chevy with a 70's model 406 in it. He has a 750 holley and a Bullet cam with a duration of 240ish in 250ish ex and he said the brakes aren't as good at slower rpm. He said they get hard to push when easin around and it takes some gettin use to. He ask me about vaccum loss and brake performance after a cam swap in an LS1. So there's how this post got started. Thanks for the replys.

Jason99T/A

iTrader: (21)

I haven't noticed any loss in braking, even after the TReX. You will be just fine with the cam.

cyphur

iTrader: (10)

while the source of the vacuum was a great idea for the LS1/LS6....its still a pain in the *** when u switch intake manifolds