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You don’t have the ports milled into the head in the location to left of your pushrod tube. A cylinder shop could do that. Jugs are hard to come by these days and can run 1500-2000 dollars each if you can find them. Going to the SDS system may be an easier option. Removing jugs and re-breaking in your cylinders is a lot of work.
Kotuku does it. Kotuku
Manifold pressure can come from a tapped hole in the servo downstream of the butterfly. Eliminates need for pulse damping orfices etc. Don at AFP approved this for my Model 150 injector install.
It’s hard and it’s at a weird angle. This is why god made man build jigs for this kind of stuff. You’re are just asking for trouble. It’s 1/8 MPT threaded hole you get one shot at tapping it straight and making sure the threads are not buggered up. If you mess it up, you’re taking the cylinder off and spending 2-3 weeks with a downed plane and probably going to spend 750 dollars getting your cylinder repaired. Not too many places around weld on cylinders anymore. Gibson maybe? Ly-Con
I have used the primer ports on my older cylinders with success.
I got my distributor / spider off of eBay and sent it to Don at Airflow Performance for rebuild. I seem to recall that you can use one designed for 6 cylinder engines and just plug unused ports.
