Hello from Texas Aryffel. There wasn't a C model Rochester. It was a B (in your case maybe a BC) with the letter C cast into it. Please rebuild it as a B or BC model and you'll be ok. About 2 months or so ago I posted a lot of information about the Rochesters and some problems age and the original design is causing today. Those posts might be interesting for you to read.


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end