Thread: Rochester quadrajet carb on a L.R 3.5 V8

Whilst I have a 350 Chev in my Landie, the combination of a quadrajet & LPG mixer sitting on top work just fine. I had to put a bonnet bump in though.
Most on this forum will bag hollies, I'm one of em.

Suggest you do a search on Quaddies to see what size engine they suit, 3.5 might be too small.
You will also need an edelbrock manifold to suit, there have been some crop up on ebay recently.

The quadrajet will work fine on a 3.5, until you open the secondaries They used to pour fuel into my 308 WB ute like Niagara falls, but didn't it make a sweet induction note and make the rear end step out

I would try and obtain a 4.2 holden V8 commodore(blue motor) Q-jet, as it's metering needles will be reasonably close to what a 3.5(Or ideally a 3.9) will require. With a bigger bore exhaust and some aggressive ignition timing, it should go well

You will need a manifold to suit a Spread bore application for these carbs.

JC

Hijack here (Sorry)

Where bouts can you get a new manifold to suit holleys and the like for a 3.5

Im in the process of changing to a single carb just cant find the manifold ??

Edelbrock make a spread bore dual plane manifold to suit the little V8. Q-jets have small primary throats and very large secondary throats. The opening of the secondaries is by mechanical linkage from a vacuum diaphragm. This can be adjusted to change the rpm at which the secondaries open. On a small engine like this, the secondaries are not really needed except on the higher end of the rpm scale. Trial and error, and road test until you get the effect you like. Q-jets have a nominal flow capacity of 803cfm in the earlier models and around 850cfm in the later ones. There are USA after-market specialists who can supply carbs and kits to increase the flow capacity. The plenum divider in the Edelbrock dual plane manifold can be reduced in height with a die grinder to give better high end performance but at the expense of low speed performance. The choice is yours. This combination of carb. and manifold is an excellent choice for almost any engine much over 3 litres. A q-jet with all four open has a larger venturi area than 3 x 2" SU's.

Originally Posted by Ken

Hijack here (Sorry)

Where bouts can you get a new manifold to suit holleys and the like for a 3.5

Im in the process of changing to a single carb just cant find the manifold ??

Try at Linda Land Rover QLD,thats what my gas garagist recommended.

Any auto shop can order them in, they should be listed in the catalogue. From memory are about $400 but are a square bore which means you need an adaptor ($40). Next time I go downstairs I can get the part number for you but any decent auto parts supplier should have the catalogue.

thanks everyone for the tips Pat

Originally Posted by Brian Hjelm

Edelbrock make a spread bore dual plane manifold to suit the little V8. Q-jets have small primary throats and very large secondary throats. The opening of the secondaries is by mechanical linkage from a vacuum diaphragm. This can be adjusted to change the rpm at which the secondaries open. On a small engine like this, the secondaries are not really needed except on the higher end of the rpm scale. Trial and error, and road test until you get the effect you like. Q-jets have a nominal flow capacity of 803cfm in the earlier models and around 850cfm in the later ones. There are USA after-market specialists who can supply carbs and kits to increase the flow capacity. The plenum divider in the Edelbrock dual plane manifold can be reduced in height with a die grinder to give better high end performance but at the expense of low speed performance. The choice is yours. This combination of carb. and manifold is an excellent choice for almost any engine much over 3 litres. A q-jet with all four open has a larger venturi area than 3 x 2" SU's.

Most on this forum will bag hollies, I'm one of em.

If people looked into how to set up holleys the correct way,they would find that they work fine in the bush.