BB Chevy Intake Manifold Bolts..
 

Trying to find out if there is any difference between the bolts used on the cast iron intakes vs. the aluminum ones...and were there changes in bolts design (markings, style, etc) from the early engines 65-68 and the newer stuff 69-70..trying to sort out a pile of different bolts I have to help a friend. Thanks https://www.yenko.net/ubbthreads/imag...ns/worship.gif

wilma

Re: BB Chevy Intake Manifold Bolts..
 

Or.........Just call D&R........One of our Sponsors, and order some.............. https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Ken https://www.yenko.net/ubbthreads/imag...mlins/flag.gif

Re: BB Chevy Intake Manifold Bolts..
 

They are different...believe they are plated differently and have different head markings.

Eric

Re: BB Chevy Intake Manifold Bolts..
 

Aluminum intake bolts have a shoulder built into the bolt so not to "dig into" the softer aluminum. Cast iron intake bolts do not have the shoulder..BKH

Re: BB Chevy Intake Manifold Bolts..
 

The cast iron bolts were shoulder-less and I believe black
posphate in color, The aluminum intake bolts were shouldered
and silver cad or similar in color.

Nuch

Re: BB Chevy Intake Manifold Bolts..
 

I have an original 68 325hp motor that came with my 67 chevelle I am restoring. It has the cast iron intake with shoulder less bolts with a washer. The letter A with three lines around the A. They were painted orange? If you need a closer look Tom feel free to stop buy when you are up my way!

Jason

Re: BB Chevy Intake Manifold Bolts..
 

I've seen the letter 'A' and letter 'M' with three lines around them as well.

Can anyone explain what the letters might designate?

Re: BB Chevy Intake Manifold Bolts..
 

A or M would be a manufacturers mark... the 3 dashes are the grade ddesignation for the bolt.

Re: BB Chevy Intake Manifold Bolts..
 

SEE misc bolts at www.amkproducts.com

Re: BB Chevy Intake Manifold Bolts..
 

[ QUOTE ]
Aluminum intake bolts have a shoulder built into the bolt so not to "dig into" the softer aluminum. Cast iron intake bolts do not have the shoulder..BKH

[/ QUOTE ]

That go for small blocks? Thought those were shoulderless and used without washers...