I have a 67 ss chevelle, with a 454 in it,roller rockers and tall valve covers, front disc brakes. I have used a 9"booster from the parts place, 11' will not fit, but 2 have broken in the last 5 months. This is getting real old. Parts place is backing up their product, but I wonder if you guys know of a better way? Thanks Bobby B

www.hydroboost.com (http://www.hydroboost.com) if you have the initial $$$ up front.

How much vacuum are you pulling?

My website also shows you how to use the dual diaphragm late model booster on our rides.

Just a few suggestions.

Joe