The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

cppursell · 05-20-2010, 05:12 AM

My engine seems to be running smoother after tuning it, except when I was road testing it, when I was accelerating on the freeway it makes a sort of higher pitched rattling noise, only in 3rd gear with the secondary barrels engaged. Any idea on what that is? I'll check tomorrow if retarding the timing a bit helps with that.

Thanks for everyone's advice so far. Yes, I realize these trucks are heavy boxes, but I love them so much! I wish I had a vaporizer carburetor and that gas at the pump would vaporize, then I'd be getting 100mpg everyday!!

05-20-2010, 05:12 AM	#25
cppursell Registered User Join Date: Dec 2008 Location: San Francisco, CA Posts: 144	Re: 283 heads on 350 My engine seems to be running smoother after tuning it, except when I was road testing it, when I was accelerating on the freeway it makes a sort of higher pitched rattling noise, only in 3rd gear with the secondary barrels engaged. Any idea on what that is? I'll check tomorrow if retarding the timing a bit helps with that. Thanks for everyone's advice so far. Yes, I realize these trucks are heavy boxes, but I love them so much! I wish I had a vaporizer carburetor and that gas at the pump would vaporize, then I'd be getting 100mpg everyday!!