Hi guys, what´s the correct thermal grade of spark plugs on a standard slant 225?

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Aspen 79 Holley 1920 HEI
Aspen 80 Super Six

Up here in North America, the 1975 and later slant-6s use a (physically) different spark plug from the 1974 and earlier engines. I'm not sure if that same change was made in South America. Can you show us a picture of one of your present spark plugs? Or tell us its number?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Ahhh, yes my slant use a conic seat and de thermal grade is # 16

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Aspen 79 Holley 1920 HEI
Aspen 80 Super Six

OK, so that is the same newer type of spark plug that was used in North America. I am guessing your #16 is maybe a Champion number, in which case that seems too hot. Can you get NGK spark plugs? If so, try a #UR5.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Dan correct number is T16PR-U11 and is make is denso, Thanks

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Aspen 79 Holley 1920 HEI
Aspen 80 Super Six