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i think the 45s is an old style gasketed plug with the 13/16 or whatever head, and the TS has a tapered seat with a 5/8 hex head.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik
 

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since we're on the subject of plugs... does AC Delco make the shorty (header)plugs. r45ts's? didn't see any in link.

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My '68 Camaro
Doug G.
68 Camaro
406 ci.
[email protected] W/ 2.73POSI.
 

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the R45TS is probably the most common plug they make. pretty much every small block from the 70's and 80's used this plug.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik
 

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The 45S and 45TS are not interchangeable. The 45TS is for tapered seats and the 45S is for non tapered gasketed seats. It has been posted that the tapered seats will seat up to non tapered heads, but it's not a good idea. The 291 heads were not tapered and should use the 45S plug.
 
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