RV 452 Heads....spark Plugs

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Jlcaptain24

Jlcaptain24

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I have an RV 440 with 452 Casting Heads that are original to the motor. IE...RV Heads.

I'm trying to determine a spark plug recommendation. I purchased ACCEL 437S Shorty plugs as they were recommended by other members for header clearance.

They DON'T fit. See pics. The bottoms side of the spark plug hole has a nipple that sticks out that interferes with the plugs. I had some old autolite plugs sitting around that I tried. They fit right in, but the "reach" is way longer than the Accel's and I'm just not sure if that's right.

Also, it appears the holds in the head have a bevelled sealing service...for a beveled plug. Not the type with the sealing washer. (term??)

Anyway...anybody have any ideas?
 

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The industrial 440 uses the 5/8 plug. - 440-3 Engine - MOPAR 4091938 or Champion OBL9Y 14mm tapered seat, gap = .035", no gasket
 
Mopar Tim said:
Your welcome.
Click to expand...

Hey Mopar Tim, I found an article you've replied to years ago talking about the spark plugs needed for 452 heads with the peanut plugs. You referenced Mopar 4091938 or Champion OBL9Y, currently I cannot find either of these spark plugs anywhere on the market for purchase. Do you have a cross reference plug you could recommend?

Champion RV9YC?
 
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