66 GTO head bolt problem

Nice car- why worry about originality when it already has a different engine? sounds like you are just making more problems for yourself- I could see it if it was go fast stuff, but- whatever- I get all my nuts and bolts at Ace hardware- find one with the huge nut and bolt aisle-

That bolt is indeed a special bolt with a stepped shaft and tall hex head on it. You can use a longer bolt and put a steel bushing under it to raise it above the casting. Or you can get the bolt from Ames Performance. On the flip side...you are downgrading the performance potential by using the older heads. The 66 093 heads have smaller valves (1.92/1.66) than the 067 (2.11/1.77). The older head also has a more restrictive valve guide area and won't flow as well as the 67 head. I wouldn't do it. With todays gas you're actually far better off with a set of 6x low compression heads. A mild port job, stainless valves, and Ram Air3 exhaust manifolds will give you enough HP on pump gas to make up for the loss in cc's. I understand the originality aspect - but most people will not see the difference in heads, and even hard-core Poncho enthusiasts will appreciate the head swap if it's done for a good reason. Good luck! It's a great car however you build it.

Hey would you know if a 66 Leland flywheel will work for a 66 GTO