Re: More about head bolts

[MO <micher@xxxxxxxxxxxxxxx>]

Rich, I believe the bolts with 6 marks are actually grade 8.  Bolts
with 3 marks are grade 5.  Naybe your two concentric circles is
instead, an 8  ??.......................MO

On Jan 29, 8:20 pm, Richard Kinsley <rlkins...@xxxxxxxxx> wrote:
> I just noticed another eccentricity with my head bolts on the 318 poly. I believe the 62 and up poly's had 6&3/4" head bolts for the long ones thru the rockershaft. The older poly's with the 3 bolt valve covers used 6&7/8". I just discovered this while checking a number of mixed head bolts and heads. When using the older 3 bolt heads the newer, shorter,  head bolts  look kinda minimal as they only have 3/4" of thread below the head surface. The head gasket makes it even less. The thread depth appears to be 1" into the block with about another 1/4" of unthreaded space beyond the threads. From what I have the longer head bolts, older style, have the grade six lines on the bolt head and the shorter ones have two concentric circles on the bolt heads.
>
> Since these engines came originally with the .020" metal gaskets, the newer .040" composites make the bolts even a tad shorter. I am using the older style heads currently but I do have the metal gaskets. I only have 5 of the longer head bolts and I'm a tad leery of using the shorter ones. Anybody got 5 of the longer head bolts with the grade 6 lines on the head?
>
> I'm going to double check and measure the length of the bolt chases tomorrow but I do believe I am correct.
>
> Rich Kinsley '64 Dodge Polara 4dr 324 poly w/goodies

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