M Bore

[Bryce]

Ive got a M block that I am going to bore (4.310)the problem is the .060 left at the top. Any thoughts?

 

[Sokypuller]

I was wanting to take a strait m block out to 4.310 and the machinist told me that it would be to thin and said I need at least a super m block for it to stay alive so I been waitin all summer so that I don't miss a pull with my super m pulling tractor I would like to know how long a m block will stay alive at 4.310 bore and stock stroke

 

[Slow burn]

Call Gary Baker, he makes rings that will press into the top if the block to take up that space. He will also tell you your options. He's the best.

 

[Bryce]

this will be 7.25 stroke so I want to make sure it works first.Already had a problem child,these are the leftovers.

 

[baldwin racing]

you can bore a m block to 4.1/4 piston after that they will be to week plus have a better chance to hit a bad or week spot.....you may be able to do a wet sleeve like a oliver motor but will cost you....for the machine work....for $300 to $650 you can buy a good 400 block and can bore them to 4 3/8 and you don't have to worry....or go 4.250 with 7.25 stroke and be 411ci
in an m block?
kelly

 

[baldwin racing]

436 ci with 400/450 block sorry did not put that...in post above

 

[Mike N Mo]

If you are worrying about the head gasket, call Murphy's. I believe he has a head gasket that eliminates the need to fill the counter bore for the sleeve.
Murphys

 

[Flyin Farmall]

Bryce, I think I have 4 rings for the top of the sleeve. I'll check tonight and if I do there yours