327 or 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rico7769 · 01-14-2009, 11:07 PM

Does anyone know how to identify the diff between a 350 and 327? My casting numbers are 3970010 w/ the other identifying #'s being 5 G 7. I understand the info, but am unsure of the block size. It was put in a 67 GMC CST before I bought the truck. It would make a diff in the horsepower rating we are looking to achieve if it is a 77 and not a 67. Any help would be appreciated. We haven't checked the heads for #'s yet. We are running a perf. intake, holley 4bbl 650cfm, accel hei system, accel 8mm wires, and perf. headers. I am also curious about the HP. If it is 67 it will be greatly diff from 77.

Thanks

01-14-2009, 11:07 PM	#1
rico7769 Hybrid67 Join Date: Jan 2009 Location: Martinez, GA Posts: 195	327 or 350 Does anyone know how to identify the diff between a 350 and 327? My casting numbers are 3970010 w/ the other identifying #'s being 5 G 7. I understand the info, but am unsure of the block size. It was put in a 67 GMC CST before I bought the truck. It would make a diff in the horsepower rating we are looking to achieve if it is a 77 and not a 67. Any help would be appreciated. We haven't checked the heads for #'s yet. We are running a perf. intake, holley 4bbl 650cfm, accel hei system, accel 8mm wires, and perf. headers. I am also curious about the HP. If it is 67 it will be greatly diff from 77. Thanks



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.