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Could I use an a12 carb on the a15 inlet?
Yes. A12 carb on A12 engine is ideal. On a A15 because it is a smaller carburetor (venturis of 20/26 instead of 23/27) it means HP would be down. You can also run A15 carb on A12, but A15 carbs are jetted leaner (if the engine is adjusted spot on it will be OK)
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I have blown a head gasket and will be building up an a15 in the next few months anyway so I thought it best to service the a15 head rather than the a12.
Why service the head? Just check it for flatness use a straightedge and feeler gauge. No need to service the head unless it's severely warped. By using the A12 head again, your A15 parts are available for assembly, and you won't have to take your car off the road again to get the A15 ready
To prevent head gasket failures:
* clean head and block surfaces fastidiously, removing all gasket traces and all oil
* Clean head bolt holes DO NOT OIL
* Torque to spec in 2 stages and in correct pattern as per the service manual
* Retorque every 24 months/24 thousand miles
Transfer
