Question on heads

hi wanted to know if i could drill out the head stud bolt holes to 9/16 instead of 1/2. i have a newer block which take 9/16 studs, but my heads 1/2 inch studs. i know you can buy a stud reducer to an 1/2 stud for the heads and 9/16 for the block. but wanted to see if i can drill it instead, so may may buy a set of 9/19 studs for the block. thx

 

You're only taking out another .0625" of material total, .03125" on each side of the hole. Shouldn't be a problem on either cast or billet head.

 

How big is a 9/16 bolt hole?
Reamed mine to .578 .Dont know if that's big enuf

 

0.5625" is a 9/16" hole.

 

heads

where do they sell the new steel 9/16 bushings after i bore it from 1/2 to 9/16 hole. the bushing where the nuts and washers clamp down on the heads.

 

if I think rite you have to machine a step in them to except the washer you are talking about..and yes it can be done I have done it for several race teams @ my shop..Dave
www.myspace.com/daveloweswr

 

Yes you are wright a 9/16 hole is .5625 But so is the O.D. of the stud.

 

stud holes

thx dave, but was trying to see if anybody in my area can do it, and just buy the steel inserts. just trying to save a few, since i will have to buy a 9/16 stud kit.

 

Hey Mopar,
Try AlanJohnson.com he's got several sizes listed under cylinder head components/hardware.


05Z-090 3/8" Head Bolt Washer Insert
05Z-092 7/16" Head Bolt Washer Insert
05Z-094 1/2" Head Bolt Washer Insert
05Z-096 9/16" Head Bolt Washer Insert
05Z-098 9/16" x 1/2" Special Head Bolt Washer Insert
05Z-100 Custom O/S Head Bolt Washer Insert

 

What brand of heads are they?
If you dont have the studs anyway why not just get the steped ones
if you drill out the holes after you take out the steel inserts you probaly will drill thru the side of the exhaust ports not a biggy but something to interupt the air flow

 

heads

thx john, block is 9/16, easier to find used stud kit than stepped ones, probily cheaper too, but not sure. have older bae fuel heads and older veney heads, both 1/2 inch.

 

Head studs

Where are you located ? Total Flow / Slawko / BAE / Fowler etc. East cost middle West coast. Let me know I know a few really good cyl. head guys on the east coast. Don

 

I have two sets of BAE fuel heads that were drilled out to 9/16 and a KB block with half inch holes that I was gonna try to get the stepped studs for. Sounds like we need to trade blocks!