Corect bolts

[Terry M.]

Re: Corect bolts

Terry, is that small block only ? 427 had 2 bolts in front and 1 at rear for the lifting bracket

Yea Tom -- BB don't count.

[Ronald L.]

Re: Corect bolts

Rich, and others...
For the 66 & 67 427, what are the expected intake manifold head marks?

[Rich P.]

Re: Corect bolts

Ron,

first choice FP, second choice M, I would not expect to see A untill 68-up. These are all recessed heads with a built in flange grade 5.

Rich

[Ronald L.]

Re: Corect bolts

I have some relatively wrenched over M's in all but two spots that have the Bubba brand, thanks for the reply!

[Patrick N.]

Re: Corect bolts

It goes without say that there are many resources to purchase fasteners if you need to replace.
One resource that I recently found to have a good selection of NOS is Heartbeatcity.com. It is a bit of hit or miss and they are not Corvette but they do have some hard to find fasteners. worth checking out if you need to replace.
BB exhaust manifold fasteners are really nice- integral flange and tri-lobe thread.

Pat

[Ronald L.]

Re: Corect bolts

Hi Pat, thanks for the reference, I know the guy up there, not far away either.

[Lawrence S.]

Re: Corect bolts

How about AMK? They seem to have nice fasteners.

[Ronald L.]

Re: Corect bolts

Have a contact?

[Lawrence S.]

Re: Corect bolts

Have a contact?

amkproducts.com

I have used them for a few of my 69 Z28 fasteners and have been satisfied.

[John H.]

Re: Corect bolts

amkproducts.com

I have used them for a few of my 69 Z28 fasteners and have been satisfied.

AMK is an excellent restoration fastener source; their headmarks may not be "correct", but the fastener configurations (length, threads, head shape, finish, etc.) are usually on the money, and they can reference direct from the original GM part number. Their catalog is well worth the five bucks (that's what it was the last time I got one).

[Gary C.]

Re: Corect bolts

AMKproducts.com pdf catalogs http://www.amkproducts.com/Catalog_PDF.htm

[Peter S.]

Re: Corect bolts

Were flanged bolts ever found on the intake manifold for '69 small blocks? I have two in my set, one was used at the front engine lift bracket.



I also noticed that AMK's bolts' headmarkings may not be a great match. The orientation of the "M" to the grade markings seems to be off, basically upside down, at least compared to the "M" bolts on my intake. I am not sure if mine are all original though. Any thoughts on the flanged bolts?

[Joe L.]

Re: Corect bolts

Peter------


I have no doubt that the flanged head bolt you pictured is an original bolt used to retain the lift bracket and manifold. For one thing, "M" headmark bolts (Michigan Screw and Bolt Co.) were never common hardware store bolts. For another, untrimmed ("indented") head bolts are virtually never seen in the aftermarket. Could the bolt have been transferred from another location on another vehicle? HIGHLY unlikely. IN GENERAL, though, flanged head bolts (or untrimmed head bolts) were not used on small block intake manifolds.

As far as the minor difference in the headmarking of original bolts versus the AMK reproductions, I expect that Michigan Screw and Bolt had MANY machines turning out bolts over many years and that headmarkings had minor differences. Of course, AMK (or any other sane company) is going to reproduce only one of the variations.

[Lawrence S.]

Re: Corect bolts

Peter------


I have no doubt that the flanged head bolt you pictured is an original bolt used to retain the lift bracket and manifold. For one thing, "M" headmark bolts (Michigan Screw and Bolt Co.) were never common hardware store bolts. For another, untrimmed ("indented") head bolts are virtually never seen in the aftermarket. Could the bolt have been transferred from another location on another vehicle? HIGHLY unlikely. IN GENERAL, though, flanged head bolts (or untrimmed head bolts) were not used on small block intake manifolds.

As far as the minor difference in the headmarking of original bolts versus the AMK reproductions, I expect that Michigan Screw and Bolt had MANY machines turning out bolts over many years and that headmarkings had minor differences. Of course, AMK (or any other sane company) is going to reproduce only one of the variations.

Joe,
Flanged or shouldered bolts were used on the lift hooks for small blocks. It has been documented over at Camaro Research Group. They have been witnessed on known original cars. I personally have removed them from engines that were in the junkyard. The bolts that I pulled off those engines were shouldered "M" fasteners that were indented and they were a little longer than the others. I believe I have extras in my stash.

Lawrence

[Peter S.]

Re: Corect bolts

Thanks Joe and Lawrence for confirming. I questioned it because I do not find reproductions, and vendors only offer the non-flanged intake bolts.

Lawrence, see you at Charlotte Regional?