Swapping 8ba bolts to studs

So I have been searching for previous posts and website links so I didn't have to post a newbie question.....so with no success, here it goes.

I bought a set of Offy heads and a new stud kit with hardened washers to replace the stock bolts. I was searching for info that shows where the two different length studs are threaded into the block before I start tearing into this project. Anybody have a diagram or ???

 

That would be because the thickness of the head is different in some places. It should be fairly obvious but you could take one of the stock head bolts and stick it in each hole in the aluminum heads on the bench and figure out which spots are thicker.

 

Dang Mr48chev. Talk about lighting quick responses! With that thought, I suppose that placing the studs into the Offy head would come to the same result. I will bust the heads outta the box and check to see. Thank you.

 

If you have a caliper (to measure) and even a dirt cheap one you can easily measure the depth of the holes in the head while it sits on a flat surface if the eye can't tell alone.

 

Stock heads use two different length studs or bolts; Offy heads use one (longer) length through out. Did you buy a stud kit for a stocker or for the Offy?

 

Mr48chev, No calipers. Will eyeball it and see if it is obvious.

BillM, I bought the correct Offy stud kit for an 8BA.

 

We stock a bunch of these castings (the "400's").

The photo below shows the long vs. short bolt/stud locations. The length's can also be found there!

(Add) If anyone has problems viewing the photo at the website the shorter bolt holes are all 8 along the bottom of the head and the 2 next to the Offenhauser log!

Thanks, Gary in N.Y.

P.S. I would just place this "tip" here, before working with these castings I recommend having all the heights equalized on the bolt holes. Machine all 14 long holes the same height, then the remaining 10. There are fairly large variations in these heights out of the boxes! The number posted with the photo are all "nominal" ones, they should be corrected beforehand!

 

The 10 short studs go on the bottom rows.

 

All studs are the same lenght,exception The longer ones are for the side mount gen bracket...if used

 

Ditto, Bill M. Be sure to use a good sealant on the the studs, on the "block" end.
My preference is the old-timey "hardening" Permatex.

4TTRUK