STANDARD SINGLE exhaust size?? Trivial question.

**agr071** · 08-06-2015, 11:38 PM

Just wondering as to what SINGLE exhaust size came out of factory for a 308?
I was discussing this the other day with a guy and i said 2 1/4" and he said 2 1/2".
He was comparing a V8 VT with a V8 HZ (which have a considerable amount of HP difference from stock).
I know it's only trivial but this guy is ADAMANT that he is right and he is so anal.
Would like to prove him wrong.

Thanks

**Innuendo** · 08-06-2015, 11:44 PM

I would have said 2" on the HZ and feel pretty confident about that.

**sandman 78** · 08-06-2015, 11:51 PM

**Sandaro** · 09-06-2015, 12:26 AM

Originally Posted by Innuendo

I would have said 2" on the HZ and feel pretty confident about that.

Yeah, I'd have to agree, 2" was the go in the '70s.

**Vombil** · 09-06-2015, 01:35 AM

2" for 253 so perhaps 2 1/4" for 308?

**Innuendo** · 09-06-2015, 02:04 AM

The only exhaust sizes available for HZ were:

1 5/8" ID
1 3/4" ID
2" ID

**Big Rob** · 09-06-2015, 02:56 AM

My HJ 253 ute has what appears to be the standard single exhaust and it's 1 3/4". I have a feeling it was 1 3/4" for a 253 and 2" for a 308.

1 5/8" was for 173 and 202.

**HK1837** · 09-06-2015, 08:17 AM

I thought they were 2" with a 1.75" muffler and possibly tailpipe also 1.75".

**hx-sandman** · 09-06-2015, 09:25 AM

Definitely smaller than 2 inch. They were practically peashooters

**HK1837** · 09-06-2015, 09:51 AM

This awful exhaust is the main reason why there is around 20hp (maybe even more) difference between a HJ 5.0L with a single exhaust and the same car with a dual exhaust.