When Steve a from Malvern Racing suggested boring to 1600 , I rejected the idea as not very cost effective. I have my old extremely high revving A12 but it has a burned piston and scarred cylinder wall. I have always assumed that the wall was so badly scratched that it couldn't safely be bored out without sleeving it. I really had not thought of offset boring but that may be practical for the old A12. I will have to check out the block when I get back home.

There is a notch at the top of each cylinder on the intake side that I had always assumed to be the safe boring diameter. I really haven't measured the notch to see how large the cylinder can go. There is only about .250 between 1&2 and 3&4 cylinders so boring to 1600 CCs is not practical and Steve at Malvern Racing is not what I consider reliable information.

You were very right about the A15 crank, B310GX, they are cast (and not as reliably), not forged like the early A14 and A12 cranks. I have seen a lot of 79 - 82 A14 cranks that are cast also. The only stock cranks that I would even consider using are the forged A14-H72 cranks from the 80 HP engines.

When I first contacted Malvern Racing, it was for pistons for the A14. Steve there suggested the A15 bore and I ran the idea here for input because I didn't think it was feasible. I still don't. 97mm is Chevy/Ford size, not A-series size.

I am now waiting on Malvern Racing to reply with my original question and a catalog. I think he just wants to sell more parts, not sell me what I want. I just want to have a fun motor, not a monster.

My friend that has the machine shop that I have used since the 60s has retired this year so there goes a world of knowledge that is now unusable. I have to go outside his realm now and I just do not trust everyone's knowledge. I have heard too many nightmares to take one person's opinion at this stage of life.

I love this club because there is very reliable knowledge here on the 1200. Thanks everyone.

Mareo