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Click on image for the lowdown. 
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| | | Forums66 Topics128,042 Posts1,055,511 Members48,424 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | "To use a 59 and up block with a 55-58 head and rocker assembly, gm devised a plug and drilled bolt arrangement that restricted the higher pressure and volumn of the 59 block so that you could use that block with the earlier heads." Info/photos on drilled is given near bottom of this page. | | |
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