Tool to elongate pushrod holes in heads?
 

I remember a while back someone was making a jig to elongate pushrod holes to clear 1.65 rockers. I thought it was Spotts Performance but their web site doesn't show any. I E-mailed them but they do not reply. Does anyone know of such a tool and where to get one?

It was Spotts. As of late he has become diffucult to communicate with. We use a 3/8 ball shaped carbide burr.

Like Paul said Paul Spotts had one. After thinking I had ground enough on one that after assmebly was tight in the middle I bought one. It takes a fair amount off all the way to the bottom of the hole! Using it and a mill would be the best . Using a hand drill it was a little hard to keep straight and not enlarge the guide.

Thanks for the replies. Spotts E-mailed back. Said he was out of stock and will have some more some time this winter.

If you can get your hands on a big enough drill to power a 1/2” bit then just simply drill out each hole and then use a carbide burr to taper out the rocker stud side of the hole down to a depth of 3/4”.
You will not have to take much off once each hole is opened up to 1/2” inch.

I have one, pm me if interested

I remember Paul saying he wanted to call it the "Spott-Eye" pushrod hole oval grinder for 1.65 rockers.

I complemented him that he has always been about proper fixturing, whereas i would just "get it done" by dinnertime.

So how does it bolt down and to what?

GT

Rat tail file works great to finish

Bolts down on rocker stud boss, instead of the stud

The last couple of motors I put together, while mocking it up I used a straw slit along its length and put it around a push rod and used it as a feeler gauge to check for any tight spots. A sharpie line along the straw helps.