Quote Originally Posted by sandasharpe View Post
Hi Cameron,

If your running dual fuel, don't. Decide on gas or petrol and stick with one. Never seen a really good dual fuel carby set up, too much compromise.

I'm a big fan of the std 4 barrel manifold / rochester, HDT would get these really singing and the rochester works really well on the 253 even though on paper its over carb'd.

If your running straight gas use an eldelbrock performer / holley 600 throttle plate / impco 425. HEI ignition is important, LPG heads around 12:1 compression and set initial advance around 12 degrees but get the advance re-curved to around 28 degrees total. Heaps of guys doing this. You'll have no hood clearance problems, cold start is OK - usually around 3-5 secs to prime and smooth idle with no buck and jerk. You might have to go one heat range colder on plugs with slightly smaller gap. Keep it well tuned, run the valve saver on the drip and you'll get better economy on gas than petrol and your motor will last way beyond what is normal with petrol. With this set up on a 308 manual van i've got a best of 14.1 L/100. I had a similar set up on a HQSS that my daughter was driving around and she used to get 11's and this was on the original motor and heads that had done over 200,000 miles and was pretty tired. If you're playing around with the cam be careful because the impco need a nice steady vacuum at idle. Can't begin to tell you how much fun this set up is on my van. I drive the wheels of it and 3 tanks fit under the commercials. I get around 1,000 K's for $110 - $150 (price has been pretty volatile in the last few months)
+1. Really good advice if your looking at LPG, but knowing the area you're in at the moment.... With a mild/standard tuned engine I would stay well away from the Edelbrock Torquer in favour of the Performer if you're thinking of or needing to change manifolds, for the simple reason the torquer will work a lot better lower down. The Torquer suits a cam/headwork/exhaust package that will spin a lot harder. The Performer can be bought for around $300-350 including postage off eBay: Click here and as Byron mentioned a reco Quaddy is around the same dollars, but the only real issue you might find is which fuel inlet you have. Both are at the front, however one feeds straight in, the other joins from the side...



Your HJ should take the side inlet fuel line. Don't forget to ask for it if you buy one off the net. You can mod the line to adapt to a front entry carb or you can find a WB-VL carbied 4.2 or 5.0 pump to carby fuel line. Kittle's may still be able to get one in brand new, or Isa if it is closer. You can still get quaddys non-exchange on eBay for anywhere between $300-400, but make sure you ask for the right one as I mentioned: Clicky clicky I know that Hume performance in Sydney does them on eBay from time to time. Failing that send your carb to a reputable performance shop in any capital and you'll probably not look back. If you're reasonably adept at spinning a screwdriver the two barrel strommy isn't a difficult carby to re-kit (to get you out of the poo) as long as the throttle shaft bearings in the base plate aren't totally knackered (any movement in them and they'll suck air and never tune properly), but they can be re-bushed back to new again.