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Mod | | | Forums66 Topics128,024 Posts1,055,395 Members48,422 | | 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
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#54331 01/07/2006 11:26 PM | Joined: Dec 2005 Posts: 2 Junior Member | | Junior Member Joined: Dec 2005 Posts: 2 | I have a 71 250 here and the sticker on the radiator shell says 4 degrees before TDC at 500 rpm automatic (in drive) and same for stick at 550 rpm. Vacuum hoses removed from canister and carb and plugged. Spark plugs gapped at .035. That is what the factory sticker says.
Paul H
GMCPASO-71 GMC Stepside C1500, 1929 Ford Tudor.
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