Help!!!!!!!!!!!!

[Hart_Rod]

I need some help with spark plugs. I went to parts store and got the "correct" plugs for my 1969 Suburban, R43. I come home and pull out the first plug and guess what it's different than the ones I got, R45T. Which one is correct?

Rob

[sixty8c10]

it all depends......do you have points or hei

[meathead95]

the r43 is for use with a points distributor and I use the r45ts's with hei

[CHEVYE]

not much diff in the plugs. i've got 45's in my 350 and 454, and the 43's in my 4.3 v6. they may work at a diff temp or have different lengths or????? but they're all pretty much similar. just gap em around .45 if you have hei and you should be fine.

[Hart_Rod]

It's got points.

[meathead95]

with points they should be gapped at .035

[Hart_Rod]

I tried to thread the R43, it won't even start. I guess I'll put the 45's back any unless any one has a better sol'n.

Rob

[Hart_Rod]

Does anyone know the difference between R45T and R45TSX?

Rob

[JimKshortstep4x4]

Here is a link that is pretty helpful and you may want to book mark it.

The R43 does not have a tapered seat but R43T does. S= extended tip,
x=wider gap. I like to use the R45TSX based on the way I drive, (mostly short trips).

The number breaks down like this:

R=resistor
45=heat range, (larger no is hotter plug)
T=tapered seat
S=exteded tip
X=wider gap

Using the plug with the X is a good practice with HEI as the spark plugs are gapped wider and the bendable tip can be kept parellel to the other tip. Plugs without the X will work, however.

Jim

http://www.acdelco.com/html/pi_plugs_ident.htm

[Hart_Rod]

Thanks Jim,

If I use the R45TXS with the points, should I still gap it at .035?

Rob

[krue]

Yes, gap for hei is .045

[Hart_Rod]

I have points and condenser, should I gap to .035 or .045.

R

[dtlilly]

My research says with points... gap at .035, unless you are using an aftermarket high output coil, then my best advice is to gap at .040.

[Hart_Rod]

Thanks everyone.

Rob