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I dont think Hylomar sticks to Alloy heads though...

The *best* way -- which is not the cheapest or easiest -- if to use an intake manifold that covers the holes. For example, the Tomei twin-DCOE manifold does this. It doesn't have coolant passages, but the mounting face goes down over the ones in the head. So a stock A14 or A12GX gasket works with it.

Im thinking the best thing to use would be a pipe plug just tap it when put it in.

Hylomar (the blue stuff they use to block the inlet ports in Peripheral Port rotaries) would fo the job nicely also...

Maybe overkill though

yeh what i ended up doing is tapping the holes and cut down a bolt into 3 sections and hack sawed a flat in it so i could screw it in flush. I used a touch of blue-poo just to be sure.

It had 3 smaller holes in the head.

How big/little are these holes?
I'm thinking of tapping them to suit a brass plug, say 1/8" BSP for example.
Coupled with a dose of thread sealant you should be on a winner.
You will need something mecahanically robust as you have already determined.

grub screws? I used little welch plugs in my L20B, but the holes were much bigger.

Well i finnaly got the A15 running!!!

Just that the manifold i got my hands on doesnt have coolant galleries, but the head has 3 holes for coolant to pass through. I tried a nice blob of silicone(i know i know) but it blew it out as soon as i revved it

What can i do fellas?

I also have a vannette manifold that has the galleries but in order for it to clear the extracters i have to cut it away where the coolant gallery is... Maybe i could block that somehow?