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#36295 01/12/2004 2:48 PM | Joined: Jul 2003 Posts: 252 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 252 | Went hunting for a set of fresh plugs for the '61 235cid in the Apache. Old plugs were R45T AC Delco. All I could find quickly was a set of R45 Delcos. The R45's use a compression ring at the base and have 13/16" lug as opposed to the 5/8" that came out of there. The new ones fit fine, and I gapped them appropriatly. However they seem to be a little "shorter" in terms of what is exposed on the INSIDE of the head (in the combustion chamber). Am I looking for trouble with these plugs? | | |
#36296 01/12/2004 4:12 PM | Joined: Aug 2000 Posts: 346 Shop Shark | | Shop Shark Joined: Aug 2000 Posts: 346 | Yachtcare,
The T indicates a tapered seat on the plug.
These were used in later V-8's (somewhere in the early '70's Chevy changed from the flat seat with the copper gasket to the tapered seat w/o gasket)
Sounds like the old plugs may have been incorrect for the 235. The R45's are the right ones.
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