This says its for an A14 A15 but no mention of oval port - could contact them for more photos of the manifold head flange and see if they sell them separately?
http://www.ebay.com.au/itm/New-FAJS-4 ... in_15&hash=item3f48639805

VERY old thread hahah just wondering how you went...

I'm either making a manifold ($$$$) or buying another weber and manifold ($$$$)

Rockandahardplace

I got a single weber round port manifold and got the oval port manifold ends welded on for $120. works a treat.

http://www.facebook.com/#!/photo.php?pid=4727005&id=631651339

sorry for the poor quality pic

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One here on the bay..

single 40 and A12 manifold

pm'd thanks

i have and A12 Single if your interested. actually bought it off bige

well bige is helping me out with the engine internals and cam and stuff so ill ask him what he thinks and hopefully he can help out with this. cause it will be much easier tryin to find a round A12 single than an oval A15 single

Anything is possible, depends how much meat is in the casting at the head interface.
Quite often people open a round port out to suit oval heads.

i was refering to getting a stock round port single manifold and rounding it out to match the oval ports on my A15 head.would that be possible?

$40.00 ozito dremel tool. $30 bits (2 at $15 each). Little bit of oil and get grinding on a rock stock A12 round port head. Open up the round ports to get big round ports. 'Slow' the fast & sharp curve ledge on the floor of the intake port just before the intake valve seat, take all the burrs off the intake port walls, de-shroud the combustion chamber around the valves.

Install bigger valves, face the head to bring the volume down (as you increased it when de-shrouding). I did one the other week, still working on it but it worked surprisingly well (the process did, haven't yet run the head).

The old ozito needs a break every now and then though, poor old cheapie.

The only difficulty is boring or porting the cross flow manifold as the runners are difficult to access, I planned on using a small flexi hone.