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Old 12-17-2012, 06:00 PM
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I have a set of camel hump heads on a 355 sbc. What plugs do i need? I use a/c delco, or champion. I dont know if I need teper or the other seat. also what heat range. its a strong 355 with syock pistons and a solid lifter cam headers ect. I have a good aftermarket hei with a 6500 kv coil. THANKS

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Production Camel hump heads till 1969-70 all take a gasket seat 13/16" hex large plug. NOT taperseat plugs. I see this mis=match all the time. It will put the plug threads too far into the chamber and there is no actual seat for the taper to set on.

Orininal plugs were AC 44 or 45 gasket seat.
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Old 12-17-2012, 10:57 PM
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Remove a valve cover and get the casting number offthe head. You can look them up on a website like this to find the year they were made. Chevy cylinder head Identification - Small block casting numbers Like was said pre-1970 used the gasketed plugs R45 and 1971 and later used a R45T a tapered plug.
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Old 12-18-2012, 08:46 AM
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when I had those heads I had best luck with A/C and NGK.For some reason not known to me,the champions worked great when new but didnt last.I was using points back then.set your gap at 35-40
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Old 12-18-2012, 04:04 PM
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I'm running Champion RJ12YC 13/16" compression washer plugs in my camel hump heads on a 327 Chevy.
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