I have dual Edelbrock's, so my tranny line vac is hooked to my rear carb.. But, front one looks like this.. Middle hose is always off when I set timing. (Note to all who have helped on this before--Yes, the Harmonic Balancer was worn out, new one is on!)
Why would you remove your PVC hose when you set your timing? Only your vac hose to your vac advance on dizzy needs to be off and plugged when setting timing.
