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Old September 8th, 2013, 01:34 AM
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GMCDAC GMCDAC is offline
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Join Date: Jan 2013
Location: Green Valley, east of Rapid City,SD
Truck: I have 4 GMCs, none with a V-6 - YET! Have had 2 in the family.
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Default Re: Help for a new guy

Hello Vern, I have one of those engines with the same casting number and mine is a 250. The casting codes at inliners site also verifys what you said. The first 2 pics are of the 250 I have stored with the same casting number as yours.

The 3rd pic shows the carb on the 230 in my '55 GMC. It looks like you have a Rochester Model M like the one on this engine. That is a 1 bbl carb so to put the Holley 2 bbl on you will have to get a 2 bbl intake manifold also.

I forgot to add that I don't see any major problem with your compression numbers. The 230 in my '55 has numbers similar to yours. Mine uses a quart of oil about 800 to a 1000 miles. That falls into a "good" catagory for me anyway. It runs great and gets real good milage considering the brick shape it pushes thru the air!

Hope this helps---Later---DAC
Attached Images
File Type: jpg 250 number 001.jpg (1.34 MB, Multiple views, 4 clicks)
File Type: jpg 250 number 002.jpg (881.9 KB, Multiple views, 6 clicks)
File Type: jpg manifold swap 010.jpg (1,014.6 KB, Multiple views, 6 clicks)
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Doug Crawford
Rapid City, SD

1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday

Last edited by GMCDAC; September 8th, 2013 at 01:46 AM.
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