Originally Posted by SIC-23T
hello there. I have 2 450 holleys and they are running very rich. could i jet them down to 350 specs. will this improve them or will i have to buy the 350 carbs. my egine is a 351C stock.
I run twin 450s on a clevo so it can be done. Are your 450s the 450 econo carby (piece of shit) or the list# 9776 450 which holley produce as a street tunnel ram carb. If it is the later i have found i had to do a metering block conversion on rear of both carbs to get them to give good mixtures (i had to richen mine up tho).
When are they rich? at idle, cruise or wot. It could be a number of things so before i suggest anymore can you give me more info.
ps. i do not have a stock motor but we can get them to work.