![]() I'm running about 12 degrees of initial timing and have played with it, adjusting it anywhere from about five to fifteen degrees of initial timing. I've also checked to confirm the throttle body it bolted tightly to the intake and that the intake bolts themselves are tight. I've gone back and checked to make sure all the vacuum ports on the throttle body are sealed up and removed the vacuum lines one by one, plugging them to see if I picked up any vacuum due to a downstream leak. I know it has 110 degrees of lobe separation, but still it seems to me I should have better vacuum then I do. Comp Cams advertises the camshaft as producing 12 inches of vacuum at 800 rpm and 14 at 1000 rpm on a 355ci engine. I was able to take it on its first drive last week and discovered their doesn't seem to be enough vacuum to operate the power brakes. I'm running an HEI run off of a MSD 6AL box. It has Headman 1 5/8" long tubes to a full length 2 1/2" exhaust with an X-pipe and Magnaflows. I have an original FAST EFI system on it. Additionally, it is about 10.25:1 compression and running a Performer RMP intake and Performer RPM heads. ![]() ![]() The cam specs are at the bottom of this post. The engine is running a Comp Cams 276hr hydraulic roller camshaft with 1.5 roller rockers. I am finding I only have about 6.5-7 inches of vacuum at idle, at about 800 rpm. Insight needed! So I have a fresh 385ci SBC stroker I built myself. ![]()
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