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63corvette · 12-11-2008, 05:35 PM

I would look at the carb and check your valve springs.
If I noticed my 434 getting a little lazy I would look at the valve springs and usually they were a little weak.
When I tried to run the 950 carb my 434 would not hardly get to 7000 RPM.
My 2 Cents

12-11-2008, 05:35 PM	#15
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 554 Likes: 128 Liked 361 Times in 104 Posts	Re: Brodix 18X heads??? I would look at the carb and check your valve springs. If I noticed my 434 getting a little lazy I would look at the valve springs and usually they were a little weak. When I tried to run the 950 carb my 434 would not hardly get to 7000 RPM. My 2 Cents