milling exhaust side on iron heads
#1
milling exhaust side on iron heads
Im thinking about getting my heads milled on the exhaust side to bring the divider flush. It looks like it will have to go quite a bit, anyone have a measurement of how far to go? And does it cause any problem with bolt hole depth or the freeze plugs?
#2
Some heads have a center divider recessed too far to mill flush. I believe for a BB these would be J heads not sure if there are any others. You can measure the amount of recess and then figure how much metal would need to come off. I think the ones I had done were B heads and there were no issues at all.
#3
Usually take .180-.200" to get it flush with a small flat on it. It does increase flow a little but it also raises the roof of the exhaust port. So you either have to slot the bolt holes in your headers so you can raise them up a little or open the top of the header flange accordingly. You'll also need to trim the top of the gasket opening also.
#10
I would have needed a spacer. I had to grind the bottom sides of the header flanges,to get them to clear the deck & bolt to the head.
Forget the W/Z manifolds,unless you use flanges for spacers.
Forget the W/Z manifolds,unless you use flanges for spacers.
#14
I would rather weld the center,to make it flush,instead of milling the surface back. My heads were old stock eliminator heads,that someone else had already milled. I think the center should be widened or thicker,to make a better transition into the header.
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Joel
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