Is there any way to check if a standard head ('25) has been milled?
I believe that from the head surface to the top of one of the bolt holes should be 2 11/16"
My head dimensions bottom to top of bolt holes mike an average of 2.86 so it would appear the head has been milled about .0010". I have had to grind off several of the head bolts due to bottoming and I was wondering. Thanks for the info.
John, sounds like you need to be addressing the depth of the holes in the block. I would suggest running a tap down each and blowing out any crud dislodged. Once the holes are clean, run the bolts in without the head and measure how long they are then.
Hope this helps.
Allan from down under.
Before running a tap down the hole, run a quarter inch or so drill down to break up packed in crud. Blow that out, then tap with a bottom or plug tap. Then blow it out again. DO NOT look down the hole while blowing it out. (Don't ask me how I learned this, your leftover soda straw is not a good idea) If I don't want to use the air compressor hose, I use a couple foot long piece of flexible tubing and hold my face away from the bolt hole it is poked down into.
.010 loss of depth should not cause any trouble.
Drive carefully, and enjoy, W2
Wouldn't it be better to use a shop-vac to suck the debris out of the bolt holes rather than blowing it all over the engine and possibly into the cylinders? It would be easy to connect the vac to a piece of small diameter tubing to get down in the hole.
Per the Ford factory drawing it is 2 11/16 or 2.6875.
Mark,
Do you have that spec for the low head? I am guessing it would be 2 1/16".
If you don't care about authenticity, use studs and nuts and you'll solve the problem.
Sorry Randy, I only have the factory drawing for the high head as it was needed when we were working up the machine specs for the new RAJO's.
I don't have the spec right in front of me but do a search on my name and the topic as I posted these before.
The only specs I have found on the low head is in Langs parts book, at 2". I have several of them and range from the 2" up to 2&3/16"