Ok, by now everyone must be tired of my 390 tuning questions but here is another...
It is only pulling about 14 psi of vacuum on the manifold port. It's pulling about 13.5 psi at the base of the carb. It's pulling about 13 psi at the power brake booster.
According to the shop manual, it should be pulling 17 psi.
Would a vacuum leak anywhere in the system cause the engine to pull less vacuum? I don't think so, but what do I know! Would dumping my 750 cfm Speed Demon and replacing it with a 600 or 650 cfm increase vacuum?
In order to pull that much vacuum, I had to set the timing to about 28 degrees btc. I re-sprung the mechanical distributor to advance a total of 20 degrees more. It starts advancing at about 800 rpm and stops at 4500 rpm.
Oh yeah...it leaks oil AND transmission fluid too...
Ken
It is only pulling about 14 psi of vacuum on the manifold port. It's pulling about 13.5 psi at the base of the carb. It's pulling about 13 psi at the power brake booster.
According to the shop manual, it should be pulling 17 psi.
Would a vacuum leak anywhere in the system cause the engine to pull less vacuum? I don't think so, but what do I know! Would dumping my 750 cfm Speed Demon and replacing it with a 600 or 650 cfm increase vacuum?
In order to pull that much vacuum, I had to set the timing to about 28 degrees btc. I re-sprung the mechanical distributor to advance a total of 20 degrees more. It starts advancing at about 800 rpm and stops at 4500 rpm.
Oh yeah...it leaks oil AND transmission fluid too...
Ken