Who does B Pipe Headpipe and Manifold Mods?

[2lick]

I need a headpipe and manifold opened up and don't feel like doing it my slow way with a dremel.

There were a bunch of forum members offering to do this for a good price. I can seem to find them now.
Can anyone help?

 

[jetx]

@JetManiac does I believe

 

[Big Kahuna]

I used a flapper sanding drum. approx 2" diameter.

 

[Quinc]

I sent mine off to @holeshot a while back and he did an awesome job. Opened to 50mm and looks like a mirror inside.

 

[OA5599]

If you are not able to find anybody else I can do it. Basically I mark it out off of JM's big bore gasket, cut out the manifold on the lathe (i own a lathe, so i pretty much have to do it that way...) then blend by hand for the manifold and headpipe. I'm no porting expert, I basically try to blend while taking the minimal amount of material off as I am not sure how close the water jacket is.

 

[MarkWalker]

Message holeshot on here. He does amazing work.

 

[2lick]

You guys all rock, thanks for the great leads!

 

[Pro-pulsion]

I did mine on my own when I was working in a machine shop. If you do it yourself take the time and take as many measurements as you can on making both holes line up. Using the gasket will only help you get the right diameter to match up to, sometimes those manifolds will have the outlet slightly biased in one direction or another. Mine was biased more toward the PTO side of the engine so I had to bore it more toward the Mag side to match where the headpipe was biased. When oversizing you can just skim one side of the hole while doing most of the digging on the opposite to align both parts. I think of it like this, looking at the number 8, if it were squished down mind you, it would be like looking at 2 holes slightly offside from each other. When boring larger, lightly skim the outside of the offset on both holes while taking the bulk off of the misaligned inside. This way the max o.d. encompasses both holes as a match and consumes the needed center material to give equal size holes and properly lined up with each other...

 

[OA5599]

I did mine on my own when I was working in a machine shop. If you do it yourself take the time and take as many measurements as you can on making both holes line up. Using the gasket will only help you get the right diameter to match up to, sometimes those manifolds will have the outlet slightly biased in one direction or another. Mine was biased more toward the PTO side of the engine so I had to bore it more toward the Mag side to match where the headpipe was biased.

I encountered this as well and will be checking b-pipes for this from now on. What I ended up doing was porting the manifold first, bolting the two together, then misting some spray paint through the manifold toward the headpipe to leave a witness mark. mine was also bais toward the PTO side - which was kinda nice as it made porting the headpipe easier.