Working w/JB Weld

TB

NOTHING IS EVER PROMISED
Location
Grand Rapids, MI
i seen a hole in a chamber fixed with a beer can and some duct tape.....actually it was a miller lite can..so i think we can all guess who was present at the time..
 

SkiDaddy

Just Havin' Fun!
Location
Orange City, FL
Prep is critical; clean (so as not to "grind" any oil into the metal's pores), rough surface, clean again, dry, apply JB.

When filling the intake crossover the passage is larger on the 2 ends, smaller in the center. So even if it didn't stick to the walls it shouldn't be dislodged unless the piece of JBWeld breaks in two.
 

#ZERO

Beach Bum
Location
Florida - U.S.A.
Devcon Aluminum Putty is what I used to fill my 760 intake manifold. Then I used 120 grit sand paper on a glass table to sand it down smooth and finished it with 600 grit wet sanding.
 

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I would go with A+B putty - from Randy at watcon.com

It’s “mon-metallic”, so if it does flake off it doesn’t cause and damage and its cheaper the Devcon or J-B weld.

It can be smooted into position with water and your finger to reduce grinding time.. Many top engine builders use this product. I know of many pro cases on the line filled with this stuff. Also - it's used on race heads for cars also.

http://www.watcon.com/Catalog_Pages/AB_Putty.htm This is enough to do approx (3) sets of crankcases..

The cases, intake manifolds, etc must be beadblasted or scuffed with a grinding wheel for good adhesion.
 

just joe

Site Supporter
Location
NorCal
Some have filled cases flush for more gasket seal area, others say to keep the fill below the surface to allow for gasket expansion when crushed from assembly torque.

Anyone have a gasket seal problem, or gasket extending into cases (blocking airflow) when cases are filled flush? Probably less of an issue if using a metal base gasket.
 
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