If so then I'll leave it alone and go without the advance as I have for a while now. would this be considered normal for a cam with these specs.Īdv Durĝur Lift Int/Exh LSA/ ICL Lash Int / ExhĤ0134Ē78/288 239/249.
So I checked the vacuum with two different gauges and the engine only has 5' of vacuum at idle. If I lower the idle via the carb screw the vacuum advance drops out again and then the idle is too low. When I rev the car up and let it come back down to idle, now the vacuum advance is activated and I have a totally different idle RPM (way too high). The issue is that I don't appear to have enough manifold vacuum to activate the advance at idle. This weekend after reading a link on this site I decided to connect the vacuum advance on the distributor. Mallory Unilite distributor with the vacuum advance not connected, timing is 8 degrees initial and 38 all in around 3500.ġ 5/8' headers with 3' collectors and 2.5 exhaust. Lunati 40134 solid lifter camshaft, non roller. GM double hump '186' heads, with mild porting / polishing still 2.02 / 1.60 valves It's a very typical old school small block.
I have a idle vacuum question concerning a small block 350.
