The HQ vs HZ thread.

[Vombil]

Just look at the asking price/value of each model....its a 2 for 1 deal. 1 HQ is worth 2 HZs.....nuff said

the market votes with their wallets. well said Alienman

[Alien DNA]

I still feel dirty from the last HZ i drove

[Valencia]

I still feel dirty from the last HZ i drove

See thats the difference between me and you i would never lower my standards and drive a hq

[Alien DNA]

Thats the difference between you and I....i at least know why i dont prefer hzs as i have driven them so i know how you poor buggars feel.

Whats that old saying... keep your friends close and your enemy's closer

[Valencia]

i can see that this thread is gunna have some legs and the most posts
will be back later you can be sure of that

[Alien DNA]

Will keep the fire burning for ya buddy

[Valencia]

Will keep the fire burning for ya buddy

Thats good to hear coz its bloody cold over here tonight

[HK1837]

why a hj engine ,gearbox and diff aren't they all the same?

HJ are the high performance 308. HT-HQ are around 9:1 compression. HJ are 9.7:1 and no pollution gear, especially 1974 HJ which don't have a canister. HX and HZ 308 saw compression drop back to I think 9.2:1, cam was retarded and the inlet manifold on these choked them badly, HT-HJ manifold flows essentially the same as an Edelbrock Performer, HX one is shocking. Rated hp difference between HQ and HJ was only about 10hp but on the twin exhaust cars it was closer to 25-30hp. The much more powerful HJ engine was one of the main reasons HJ 308 got the much more expensive M41 transmission, the HQ trimatic couldn't handle it. A manual HJ GTS 5.0L is essentially a performance match for a manual HQ GTS350, auto is a bit slower as the TH400 kills it a bit more than it does to the torquier 350. Another little piece of evidence if you can find it is media tests of the first of the LX XU2 (SLR5000) or SS 5.0L. One of these will show an L34 how to get down the quarter. Most tests you see are on early LH which had the HQ engine and an undersize exhaust which also carried into the later LH with the HJ engine. It wasn't until LX when a proper twin 2" system was used.
So forgetting the auto 308 Sandmans as standard gearbox and diffs varied between HQ-HZ, but stick one of each series Sandman in 308 manual (all will be L31 M21 GV4) all in the same bodystyle on the dragstrip. HJ will win easily, followed by HQ. By HZ the doggy ADR27A engine was sorted a little better so the HZ will probably run 3rd. Give them all a twin exhaust and HJ will probably widen the gap slightly.
Longwinded answer, but this is why I said HJ engine. Auto box is just my personal preference, plus I like to see expensive factory options! And I also like virtually maintenance free transmissions. If HJ 308 had copped a T10 4spd which it really should have(Muncie was no longer used in US cars at that stage as there were no big hp cars anymore, so they used the BW T10 as it was good enough for lower hp cars) i'd probably have that instead.

[Gunna Do]

Thanks for that info i would never have thought they would be different,so i will have to keep my eye out for a 308 out of a HJ, plus i have nice set of L34 heads to go on one.

[Valencia]

Good to hear that info byron my l31 and m41 was out of a hj vacationer wagon virgin bore so pretty happy bout that only coz my van was a rolling shell when i bought it
heck i didnt even know it was a sandman till years later