Thread: Chevy 283 all messed up.....Need advice

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I ran into a guy at one of my customers shops several years ago that did the same thing you did and had the same result as you.The RPM intakes large ports are too much for your 283 heads and the Carb is too much also.I suggested He use a Std. Performer intake and a 500 CFM Edelbrock Carb,as soon as the switch was made it ran like a striped ass ape! Your engine is loading up from a lack of low speed velocity due to the large runners in the RPM intake,I would also suggest you change the oil and filter again as you probably have raw fuel in the pan.Since you are not sure of the Carb do this,looking at the front of the carb there are numbers stamped on the front left mounting tab so post those and we can verify the Carb size.