STANDARD SINGLE exhaust size?? Trivial question.

[wbute]

Could have been. Was 20 years ago they went in the tip.

[HK1837]

The only Torana I've found so far with any original specs is the L34. It had 2" engine pipes and 1.62" tailpipes. I think this was the same as normal L31 SL/R as well as exhaust past the headers was free under Group C.

I also just looked up the HQ Service manual volume 4. It states as I thought all along:

Engine pipes - L6 1.875" OD, V8 2" OD. Tube thickness 0.06".
Tailpipes:

L6 1.625" OD. V8 engines (except GTS350 or N10 dual exhaust (253 and 308)) 1.75".
GTS350 or N10 dual exhaust on 253 or 308 - 2".

As far as i'm aware HJ-HZ was identical (except no 350).

Note this is passenger vehicles. The HQ commercial vehicles supplement issued in late 1971 shows the exhaust differences (mounting) but makes no mention of any size in pipe changes (it would if they were different).

[agr071]

So we were both wrong, bugger.
Looking at the 2" system that Byron posted, that's what I had on my ute and originally wanted on the van. But won't fit because of the shift linkages.
Having said that, I would still do a single, but in 2 1/4" to help it breathe a little better. Also will have 2 hot dog mufflers on it.