| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,094 Posts1,056,489 Members48,444 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2006 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2006 Posts: 84 | Are 228 and 270 heads interchangeable ? | | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | Yes, you can interchange the GMC heads but you could notice a difference in performance depending on which head is going on which block. Patrick's has all the info on this and I'm sure would gladly share any downside to what you want to do. | | | | | Joined: Nov 2006 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2006 Posts: 84 | Thanks,
Does Patrick have this info listed somewhere that I could refrance it?
| | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | His website is pretty sparse but I think you can still get a free catalog and he has some info on identifying GMC heads in there (my catalog is several years old, I hope it's still in there). | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | The GMC P/N for a replacement head is 2071456 for 228,236,248,270 prior to 1953. As a rule of thumb, any head that was used on an engine with the domed pistons will interchange. Casting numbers can be 2136477,6107412, 2194819. A GMC from 53 on will use a flat piston and a different head. | | |
|
|
| |
