Hi all you wonderful Buick people I am trying to find out whether my parts are 455, 455 GS or 455 Stage 1 parts: Heads: 1231786 (large intake/exhaust) Carb: 7042242 (what size cfm?) Intake: 1238323 Thanks
Heads: 1231786 (large intake/exhaust) 1970 cylinder heads have the same casting number whether they are Stage1 or not. Stage 1 had 2 1/8" intake and 1 3/4" exhaust valves. Carb: 7042242 (what size cfm?) That is a 1972 455 Stage 1 carburetor. It is 800 CFM. Valuable. Intake: 1238323 1972 455 California Intake.
Being the heads are Stage1, they are more valuable than small valve heads. Yeah, the intake is nothing special unless someone is doing a concourse correct restoration. The carburetor is probably the most valuable part you have there. There were only 728 Stage1 GS cars built in 1972. http://www.v8buick.com/index.php?threads/1972-stage-1-qjet-price-reduced.355665/
Correct. All carburetors meant for the 350 were 750 CFM. The difference is in the largest venturi. In the chart I posted, the 350 carburetors had 1 3/32" venturi, and the 455 carburetors had 1 7/32" venturi.
Just to add to the carb info: Just make sure its not a Service Replacement carb. Need the other numbers to be sure.
The date code is next to the carb code. I have a stage1 carb on my '71 but the date code is 0128. 12th day in '78. Some time in '78 the carb was replaced at the dealership. Making it a Service Replacement.