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Click on image for the lowdown. 
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| | | Forums66 Topics128,084 Posts1,056,087 Members48,434 | | 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!
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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: Apr 2000 Posts: 499 'Bolter | | 'Bolter Joined: Apr 2000 Posts: 499 | I'm pretty sure '75 was a large base/cap HEI with external coil. '76 was the start of the internal coil HEI. Use either one. I have switched from the internal to an external because I need more room above it for a AC compressor.
'67 GMC 3/4 292 4spd
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