tunnel ram

I just remembered a pretty nice 327 on a dyno back in probably 1990ish. I was at a shop to rent some flow bench time (we ended up comparing notes and testing each other's stuff when I bought my own bench) and that thing was on the dyno. It was a pretty well warmed up 327. The owner brought in a 3310 Holley. They beat on it for a while and then realized the secondaries didn't open fully with the lightest spring. I remember the owner and the dyno guy discussing if the spring was too light, letting it start the secondaries open a bit, opening too early and then never getting the secondaries open all they way.

They changed springs a few times and then put a 750 DP on it. It picked up a bunch of power and some RPM as well. The engine owner blamed the single plane intake for not having air speed to open the secondaries. Looking at the numbers, the DP made more power lower and longer than the VS carb did.


I'm just not a fan of VS carbs on anything. Unless it's a Carter. Those are different.