Should have expected it

['68OrangeSunshine]

Originally Posted by 70STOVEBOLT

[QUOTE/[I have a set of US made AC 45 plugs, but my mechanic says I don't need to go a range hotter on my 350 in the Jimmy.

Unless you have HEI. Then you will want the R45Ts.[/QUOTE]

I do have HEI on the 350 [and the 292].
But as I understand it, the only difference is in electrode gap:
.035 for Points and .045 for HEI.

[1970cstblazer]

Originally Posted by 70STOVEBOLT

Unless you have HEI. Then you will want the R45Ts.

The "T" indicates tapered seat, which was used in 1971-up engines. My 1970 Blazer 350 uses R44 plugs. A 1971 Blazer would use a R44T.

[70STOVEBOLT]

Originally Posted by '68OrangeSunshine

Unless you have HEI. Then you will want the R45Ts.

I do have HEI on the 350 [and the 292].
But as I understand it, the only difference is in electrode gap:
.035 for Points and .045 for HEI.[/QUOTE]

You are right. I had a brain fart, thinking about the gap number, not the heat range.

[70STOVEBOLT]

Originally Posted by 1970cstblazer

The "T" indicates tapered seat, which was used in 1971-up engines. My 1970 Blazer 350 uses R44 plugs. A 1971 Blazer would use a R44T.

Yes, I know the stands for tapered seat. I have a 72 engine in my 70.