Engine differences

**matt.p** · 10-01-2014, 12:43 PM

Appart from engine number qt and 11qt what are the differences in engines? What problems could i encounter by putting an 11qt engine in my car with pre pollution and a neoprene rear main seal?

**Absinth** · 10-01-2014, 01:38 PM

Originally Posted by matt.p

Appart from engine number qt and 11qt what are the differences in engines? Nothing

What problems could i encounter by putting an 11qt engine in my car with pre pollution and a neoprene rear main seal?
dunno!!!! What model car do you have?

Assuming you have a HX or HZ the only problem you may have is trying to register a pollution model with a pre-pollution engine.

**HK1837** · 10-01-2014, 02:52 PM

ADR27A is all external stuff other than the heads so as long as you use the heads and all the pollution equipment it shouldn't be an issue.

For the same timeframe build the 11QT and QT engines are the same. But from HJ the piston dish decreased to increase compression from 9.0:1 to 9.7:1 making the HJ a significantly more powerful engine, so much so that there was no longer any need for the 350 and 400 proposed for HJ espeially with a dual exhaust system.
Then ADR27A hit in HX and the manifold fitted plus the tuning of the engine basically killed it. People knew this from the HJ to HX transition, but imagine having test drove an LX SLR or SS with the HJ engine which with its proper 2" twin system and light weight was a very fast car (as quick as or quicker than a stock L34), so you ordered one. Then this puking, gutless post 6/76 one turns up. You'd be spitting chips!

**Absinth** · 10-01-2014, 03:16 PM

Which is why most HX V8's now have Edlebrock manifolds, Holley carbs, extractors and twin system fitted with some carefully hidden blocking of pollution hoses.

My HX Monaro had that exact set up on it when I bought it, and funnily enough so does the HJ Sandman I just bought.

The engine in the HJ is an IIQT HQ Statesman engine that has GEM engine rebuilt stickers on it. Appears it was a replacement engine early in the cars life..... Radiator was reconditioned in Mt Isa in 1978 and the Gem engine was fitted in Mt Isa so the original engine was probably cooked and cracked the block.

**HK1837** · 10-01-2014, 03:30 PM

You don't need to block any pollution hoses especially on manual cars as they don't have an EGR valve. The only pollution equipment bypass (apart from changing the carby's setup and assuming you've already fitted extractors and a decent exhaust thus removing the flap in the exhaust) that gives you any real change is to defeat the vacuum advance control stuff. The rest is just capturing of fuel evaporation into the canister.

**matt.p** · 10-01-2014, 04:04 PM

Im in 2 minds what to do. being in nsw and the car eventually needing a blue slip i think pollution setup might have to be fitted. To clarify a 11qt and qt block is the same, heads can be pollution or not and a pre 1976 engine would be the way to go.

**Innuendo** · 10-01-2014, 04:23 PM

What model is your Van? That is the important question that needs answering.

**matt.p** · 10-01-2014, 04:28 PM

Hx 2/77 compliance l31 but has 253 in it currently

**HK1837** · 10-01-2014, 05:34 PM

If you want to comply, want it to have decent perfromance and don't mind if it isn't 100% stock then do this:

Any red 308 QT block (you can accidentally paint over the 11, it was added at the assembly plant anyway and wasn't stamped with the rest of the number).
Any red heads, or blue or black heads if you like.
KC manifold, or Edelbrock Performer. KC looks more original as it is a copy of the blue motor HDT manifold.
Blue quadrajet built to suit the engine.
Blue/Black HEI dizzy and coil with points cap and XD/E Falcon rotor.
Run an original viscous fan and shroud or if you like a good set of thermo fans.

Use whatever exhaust and cam you can to be legal noise wise. Hook up all pollution equipment, blank off the EGR plate (manual 308's have this). If you use extractors I like to weld on a little bit of pipe on the passenger side so the heat riser can be hooked up to the aircleaner to look stock, but put a ball bearing in the vacuum control line for the valve in the snorkel. You can make the original auto choke work off the manifold or use an electric conversion.

**Vombil** · 10-01-2014, 05:37 PM

Originally Posted by HK1837

ADR27A is all external stuff other than the heads so as long as you use the heads and all the pollution equipment it shouldn't be an issue.

For the same timeframe build the 11QT and QT engines are the same. But from HJ the piston dish decreased to increase compression from 9.0:1 to 9.7:1 making the HJ a significantly more powerful engine, so much so that there was no longer any need for the 350 and 400 proposed for HJ espeially with a dual exhaust system.
Then ADR27A hit in HX and the manifold fitted plus the tuning of the engine basically killed it. People knew this from the HJ to HX transition, but imagine having test drove an LX SLR or SS with the HJ engine which with its proper 2" twin system and light weight was a very fast car (as quick as or quicker than a stock L34), so you ordered one. Then this puking, gutless post 6/76 one turns up. You'd be spitting chips!

my HJ 253 goes like the clappers with a 2 barrel. mad displacement!