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bob1966



Joined: 29 Apr 2008
Posts: 49
Location: Ocala, FL

owner since 1968 1966 GTO

PostPosted: Sat Dec 03, 2022 4:27 pm    Post subject: Head Bolts Reply with quote

Did the 66 GTO 389 have head bolt washers.
I had a coolant leak, took the heads off to replace the gaskets and have the heads checked. no washers on the head bolts.
Looking and new APR bolts and they have washers.
Tk's bob1966
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Larry
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Joined: 01 Jun 2006
Posts: 4767




PostPosted: Sun Dec 04, 2022 11:19 am    Post subject: Head Bolts Reply with quote

I have taken apart a fair share of engines and don't remember ever seeing washers on cylinder head bolts. But to double check I have looked in a couple Shop Manuals and Parts Manuals and still see no washers.

If there is some benefit in washers, I do not know. But if I was a company selling new bolts, I might think of adding washers too ($$$).

Checking further, Original Parts Group sells the head bolt kit with no washers involved. My guess is it is something the high performance people have added for no apparent good reason (did I mention $$$$?).

A lot of forums suggest using the original (cleaned up) bolts as they feel they are better than the aftermarket stuff.

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bob1966



Joined: 29 Apr 2008
Posts: 49
Location: Ocala, FL

owner since 1968 1966 GTO

PostPosted: Mon Dec 05, 2022 2:16 pm    Post subject: Head Bolts Reply with quote

Hi Larry, I did see several bolt sets for sale that came with washers.
I know washers are used on aluminum heads. My other issue is they don't have the correct center head exhaust bolt and it's 1/2" longer than the other longer bolts.
Can't seem to find anyone that sells them. It takes two, one on each head.
I'll post a pic.
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bob1966



Joined: 29 Apr 2008
Posts: 49
Location: Ocala, FL

owner since 1968 1966 GTO

PostPosted: Mon Dec 05, 2022 2:23 pm    Post subject: Head Bolts Reply with quote

pic
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Larry
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Joined: 01 Jun 2006
Posts: 4767




PostPosted: Mon Dec 05, 2022 2:36 pm    Post subject: Head Bolts Reply with quote

I would suggest you contact David Butler at Butler Performance (see ad to the left) or Darrin at Nitemare Performance (see ad to the right). I bet either of their shops have bolts all over the place. Just offer to pay a fair price and the shipping.
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bob1966



Joined: 29 Apr 2008
Posts: 49
Location: Ocala, FL

owner since 1968 1966 GTO

PostPosted: Mon Dec 05, 2022 2:55 pm    Post subject: Head Bolts Reply with quote

will do
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