Those cracks aren't the end of the world. The local VW shop said that most VW heads have that crack and it normally doesn't cause any failure. I flew with the cracks for 8 years.The following statement was posted on the Yahoo group Starlet site, by another member. There are trade offs with the larger displacement VWs.
A second Revmaster (VW) head has cracked between the intake and exhaust
valves on my Corby. It had 40mm intake, and 36mm exhaust valves, which
left precious little metal in between, and that's where it cracked, just
like last time.
Any idea what the current draw at 2900 rpm would be with a bosch coil and 009 distributor? A page out of the Corvair approach would offer a left and right blue coil through a MSD coil joiner to a common distributor with a points plate with 2 sets 180 degrees apart. Points have a slow "graceful" deterioration and give fair warning. Switch to the right when that happens. This set up would use one plug per jug. Spark plugs do foul slowly but rarely fail catastrophically unless they blow out of the head....This has been kicked around before, and the short answer is: single ignition using an 009 distributor (or 009-based electronic ignition), dead-drain battery (simplest) or small dynamo/alternator (could be wind-driven) with very small battery, single carburetor or throttle-body injector, stub exhausts, Nikasil cylinders if you can afford them. Here's an oldie but a goodie from my site: Steve Bennett on FRED VW power
From a prior discussion here, it appears to be under 4 amps.Any idea what the current draw at 2900 rpm would be with a bosch coil and 009 distributor?