early style 302, c4, rpm air gap intake, holley 4160
i had a 4160 double pumper on the engine, but 2 of the bolts in the metering block were stripped and started leaking. i got another 4160, but with vac secondaries, rebuilt it and popped it on. it idles and runs fine, got the idle mixture set properly with a vacuum gauge, however there are 2 things i'm noticing.
at idle, the engine shakes more than the double pumper did.
also, in park/neutral, if i rev the engine, the rpms will dip below where it idles (idles at ~1000, dips to 700 or so), then comes back up to ~1000. also, when driving, the engine seems to slow down in rpm a lot slower than the old double pumper. what might cause this? is this even an issue, or normal behavior for a vacuum secondary?
thanks!
i had a 4160 double pumper on the engine, but 2 of the bolts in the metering block were stripped and started leaking. i got another 4160, but with vac secondaries, rebuilt it and popped it on. it idles and runs fine, got the idle mixture set properly with a vacuum gauge, however there are 2 things i'm noticing.
at idle, the engine shakes more than the double pumper did.
also, in park/neutral, if i rev the engine, the rpms will dip below where it idles (idles at ~1000, dips to 700 or so), then comes back up to ~1000. also, when driving, the engine seems to slow down in rpm a lot slower than the old double pumper. what might cause this? is this even an issue, or normal behavior for a vacuum secondary?
thanks!