Quote: Steer Clear of the 660's never seen a set work as good as the newer design 4150 carbs
I had a set of 750 vac. sec. Holleys on my tunnel ram and they ran ok. Nothing to really brag about. I the had a set of 660's worked up and it was night and day. I dropped 1 second. Granted I don't go to the track every week or even more than 2 or 3 times a year, but the difference in the way the engine worked was unreal.
They guy that did them pulled the metering plates out and put jet plates in. Set them up with center hung bowls, milled and flowed the air horns.
I had jetted them down, but now am back up to 76's all the way around. I may fatten it up just a little bit yet. I didn't get to run it yet this year.
