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Of course it's at the back of the tank, sorry had the image of the tank back to front in my head.

Hi, just to add I would put the pickup at the rear of the tank. Or make a surge tank the sits inside the tank that is fed with a lift pump. Also the return nipple is smaller than your supply nipple could this add to a flow restriction that could make your pump work harder. I doubt it, but just...

I would also recomend you check the ignition is set and working correctly (mechanical and vacuum advance, etc). Also this article is worth reading on how to setup the idle on your carb. About 2/3 down the page it mentions the correct butterfly position to have for a smooth transition from the...

I want the cat back!

Hi fishy, there is a hose barb that goes on an opening next to the carb (which isn't in the photos) completing the circuit.

Just posting an update on this. I bought the dual plane M1 from ebay and just received it today. Here are some pictures showing the water passage that comes through under the thermostat. Thanks.

Hi Fishy, If you have a look at the 360deg. image, the manifold will rotate and show the underside of the manifold and you'll see the bulge run from the side of the manifold up to the front. And the threaded opening on the side where the carb sits would be for the heater hose to connect to. At...

Hi Fishy, If you have a look at the picture on the summit page there is an extra coolant passage that runs under the manifold where the carburetor sits for heating. The one you're talking about is where the thermostat sits, I know every manifold has this. I had a car that used coolant for...

Thanks for the replies. I going with magnum heads, it doesn't look like there are any manifolds with heat crossover. The Mopar M1 dual plane looks like it has something for water heat crossover but I can't tell for sure. Does anyone know? edit: I've answered my own question, summit have a...

Hi, Can I get some feedback on how the air gap manifolds run when it's cold? I'm concerned that the air gap will cause the motor to run like a pig until it gets some heat into it. Thanks.