Welding exhaust port PAIR holes

[jimbob8915]

Has anyone welded the PAIR holes shut in the exhaust ports before porting to clean up the flow? Is there an epoxy that can handle the heat? I have tapped and screwed in plugs on the outside of the PAIR but would like to clean up the port.

 

[Berlin Germany]

two ways:

1. drill a thread into the 2nd-ait-hole in the head and wrench a screw behind with a bit loctiting the srew.

2. cut a 3 mm (1/10") thick and estimated 20mm wide alu-panel drill two 6 mm wide holes into and mount the alu with the original m6 nuts with 10-12 Nm
a gasket between head and alu is not necessary, if the alu is flat like a mirror / windows glas.
read my page - i described that job (#2) incl. 2 pics there

 

[202mphbusa]

I just tap them as Mr Germany has said
I even made a aluminum tube to hold the tap perfectly straight not that it has to be but hey I am a machininst

 

[pcs]

ive used epoxy to plug holes and reshape intake ports.

 

[jimbob8915]

I want to plug the hole in the exhaust port. I have already plugged the holes that exit the head

 

[Berlin Germany]

I want to plug the hole in the exhaust port. I have already plugged the holes that exit the head

read my ..cking page - i described that job (#2) incl. 2 pics there

 

[pcs]

fill the hole with putty

 

[Berlin Germany]

the "putty" may work quite well

but the more elegant variant is the one I showed,
moreover, this is reversible at any time and super easy.

but everything as someone wants
+
as I often say:
the monkey says it's all a matter of taste when he bites into the soap.

 

[jimbob8915]

I removed my head today and I noticed that the hole in the port is a straight port to the hole that exits to the outside. I had some 5/16 aluminum rod sitting around so the drilled the holes out. After drilling the holes I used a grinder to square the end of my drill bit and square up the bottom of the hole that cuts into the exhaust port. I drilled and tapped 10x1.25 holes into where the PAIR ports exited the head. I the pressed the aluminum rods into the new holes and will put pressure on them and seal them to the head with some 10 x 1.25 set screws. I will use some high heat epoxy to seal any small imperfections.

 

[jimbob8915]

Pic of port now before any sealant or porting

 

[jimbob8915]

I thought about having it welded but local welder wanted $100 per port. I think I can make this work really well. I have a ceramic coating I will use in the exhaust ports and combustion chambers, a coating for piston tops, and skirts. For now I will be doing the intake cam to exhaust cam swap, remove base gasket and a port clean-up.
Saving for Web cams and Gen 2 crank.