does anyone do torque plate boring any more!

[pit/wood]

I have concerns about the 440 kits that I install for myself and friends.when doing maitanance tear downs I have noticed a wear pattern in the jugs.you can see where the stud holes and jugbolt holes are located by looking at the ring seating pattern. I dont like it and I know that my machine work is good.is there something that I need to know about these air-cooled 400ex jugs???

[bradley300]

nothing real different about them than a liquid cooled jug, they just arent as consistant with managing heat. 400ex studs are also kinda weal and have a tendency to pull out when a 440 kit is installed. there are several companies that make heavy duty stud kits such as gthunder and curtis sparks

[pit/wood]

thanks,using 12mm studs,they fit real tight on the sleeve lip.took a bit foredom work to get a nice job.and believe me I wish these 400ex jugs were w.cooled(I know somebody has done it,must have)the seating is not realy that bad,but I can see a difference you know.my background is automotive,so there may not be anything to be concerned about.dave coe has been doing race work on big-bore air-cooled engines for many years,so I am sure it isnt a machining concern.unless there is something different about these 400ex jugs.

[atc86r]

Macdizzy uses torque plate when boring.

[pit/wood]

does macdizzy use this forum?or just a have a shop somewhere?

[atc86r]

macdizzy.com

[pit/wood]

ooo,that macdizzy.I found his website about 2 years ago.realy helped me to make my old blaster faster.I plan on getting a set of unusable cases and making my own fixture.but I think a call to macdizzy wouldnt hurt.thanks

[wilkin250r]

Macdizzy concentrates mostly on the 250r and a few others. I doubt he has the fixtures and plates designed for boring the 400EX. You can certainly ask him, though.

[pit/wood]

thanks,I think making my own plate and fixture is the way to go.that way I will always have it.A set of broke cases, a chunk of steel and some machining time.kinda of a no-brainer.but I bet it gets me a nice pattern on my cyl.wall.