Help Identifying Pistons - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**pjmoreland** · 12-25-2020, 06:01 PM

The engine in my truck is seriously wimpy, and I'm trying to decide whether it is worth it to replace the heads or if I should just replace the entire engine. It is a two bolt 3970010 block from 1979 with 991 smogger heads. Compression ranges from 170 to 185. It consumes a quart of oil about every 2000 miles. I took some photos of the pistons using a scope. If these are flat top pistons, then I'm leaning toward putting on some 64cc heads. Is that a good idea, or would I be wasting money on this engine? Are these flat top pistons?

12-25-2020, 06:01 PM	#1
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,119	Help Identifying Pistons - Upgrade Heads or Replace Engine? The engine in my truck is seriously wimpy, and I'm trying to decide whether it is worth it to replace the heads or if I should just replace the entire engine. It is a two bolt 3970010 block from 1979 with 991 smogger heads. Compression ranges from 170 to 185. It consumes a quart of oil about every 2000 miles. I took some photos of the pistons using a scope. If these are flat top pistons, then I'm leaning toward putting on some 64cc heads. Is that a good idea, or would I be wasting money on this engine? Are these flat top pistons? Attached Images Last edited by pjmoreland; 12-25-2020 at 07:07 PM.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.