Correct plugs for 041 heads with hei

[jradford]

So new truck to me and has 041 heads, 1970 350 engine. Currently has AC R44 taper seat plugs in it. Pretty sure this head needs a gasketed plug. What will work with the HEI ignition and fit this head. I know you guys are experts on this but new to me. TIA Jim

[68Gold/white]

A tapered seat plug would likely be a R44T or R44TS.... the "T" is for tapered seat. Not trying to be a Beavis, here, just help.

They no longer make any gasket R44 plugs, it's either R43 or R45. The R43 is a cooler plug than a R45, and does NOT have the extended tip.

My engine builder never recommended extended tip plugs. I still trust his thinking, many will disagree...

If the engine is in good condition and runs well, I'd use R43 plugs. If it's a little lacking power wise, not in best condition, I'd go R45.

THe extended version of these 2 plugs has an "S" at end, R43S, R45S, if that's what you want...

[jradford]

Guess I need to correct my original post. They are r44T plugs. The engine runs well with these plugs but don't think these heads should have a tapered plug. Pulled one to see what they are as headers are going on Monday and a good time for new plugs. Thanks for recommendations.