Vic Jr and spacers

[John Scott]

I figured a 1/2" is better than nothing and the lowest profile versions of the Vic Jrs can sometimes benefit from a spacer at really high RPM due to fuel rebounding off the floor. I can still close the hood with the 1/2" spacer and a 3.5" filter using a really low drop base. I tried a open spacer and the result was dramatic..ly poor. I felt my carb is dialed in pretty close and it caused a surging in low mid range tip in, and felt lazy on the bottom and mid range with no improvement on top. Maybe with more adjustment, more jet, it might have been better, but the way it was it ran like crap! Wow, a little spacer did all that? A four hole, however, really perked things up. Better throttle response and picked up low and midrange as well over the stock manifold height. As big as my cam is 244@ .050, .614/.585 108 LSA, and a single plane, this combination allows me to run down to just above idle in gear w/o any bad manners. The 108 of my cam gets things done at a lower, tighter RPM range, maybe better for the four hole?? Every engine combo will be different, but I'm sticking with the fourhole. I'd recommend only the phenolic spacer as they really insulate the carb from the manifold heat. If you have the room and single plane, you might benefit. If I had the room I'd give a 1" a shot.