head milling

[chimp koose]

Ok so I milled .030 off the deck surface of my sbc heads,now I want to mill the intake surface on the heads so I dont have to butcher an otherwise stock intake manifold.I know I will have to mill the bottom of the intake where it meets the block but that can be compensated for with silicone or spacers if the intake meets a set of stock unmilled heads later in life.How much do I take off the intake flanges on the heads ? Memory tells me about .036" but I have been known to rememory things not right. Anyone know for sure or have a formula I could use?......Wayne?

[wayne petty]

this is the closest angle i could find while milling around...

http://www.circletrack.com/enginetech/ctrp_0312_angle_milling_cylinder_heads/index.html

its still not what i was looking for...

i remember the storm vulcan book for the block master  that had the figures in it.. but that was long ago and far away...

i will see if i can shave off a few more bits of info for you....

http://www.practicalmachinist.com/vb/general/v8-chevy-intake-manifold-milling-166909/

On the small block Chevy, the rule of thumb is, that for every .005 in. removed from the head or block deck, a hair over .006 in. must be removed from the heads intake face (or the side of the intake manifold) and between 0.008 and 0.009 in. removed from the end mating surfaces. IIRC this is the same for the big block.

[wayne petty]

http://www.goodson.com/technical_support/tech_library/angle_milling.php




just curious...    do you stamp on the underside of the head someplace where it cannot be seen... how much you removed  from the deck and intake surfaces...  

vibrating carbide marking pen to write on a rough surface ...

or on intakes.. under the carb flange gasket how much was removed ..

a few seconds... to save hours or days of work much later...  kinda like using anti seize...  you may not be the one to remove the bolt.. but somebody will have to eventually...

[chimp koose]

Thanks Wayne, at .006" off intake per .005 off head,my .036" was right!.030 from head makes .036 off intake.I will definately mark the heads as to how much has been milled. We have one of those little boroscope cameras at work so I may just mock everything up with proper gaskets etc. and sneak a peek at port alignment before I cut the intake flanges all the way. These heads were port matched to this intake a long time ago and I would like to keep the ports as close to matching as possible without resorting to much grinding as this intake was off a strong running SS/ motor back in the day. I have to do some chamber work as well since I went to larger valves and need to do some unshrouding .