230 Intake manifold set anyone?

[MBF]

I may be kinda in need of a good manifold set for my 230. The bolts holding the two halves together broke off in the intake, and I can't get them drilled out. I have a good manifold set that from a Chrysler industrial that I removed from a Worthington tractor. It has a much larger plenum under the carb w what appears to be a diffuser plate underneath the carb in the plenum, and the heat control valve is free and working!! Has anyone used these type of intakes on any of their projects? Thanks-Mike

[Young Ed]

Intake bolts breaking is very common. If there is anything left exposed you can usually cut a screwdriver slot in the bolt and with lots of heat get it out.

[MBF]

The threaded part that is broken off are so work hardened I can't get a drill to make a dent. I was going to try and find a left handed carbide bit as a last resort. Mike

[JBNeal]

I feel your pain...luckily, my local welding/machine shop sees this sort of thing enough that for $10 one of the guys will drill the old stuff out & chase the threads during their lunch break. From the bite marks on my manifold, it looks like they chucked it down in a drill press to get the pilot hole started. Then they collapsed the sides of the old bolt with a punch, essentially reducing the bolt diameter, allowing it to back out of the tapped hole.