Re: More about head bolts

[Richard Kinsley <leroar.kinsley058@xxxxxxxxx>]

I checked the measurements on the heads I have and found I am wrong in that they all seem to be the same height at the top of the head bolt point on the rockershaft pedestal. The two head bolt styles are different though. The one with the six lines is 1/8" longer than the one with the concentric circles. I'm including a picture so you can see what I mean about the markings. I certainly would prefer the longer bolts as there is plenty of room in the block for the longer threads and that would mean more contact/holding power.

I have always thought my pushrods should be a little longer as they are about maxed out on adjustment. Probably the fact that we use composite gaskets instead of metal gaskets has caused this issue. It is .020" different between the two.   Since I am using metal gaskets this time I will see how it affects the adjustment. 

I do believe I would prefer studs over bolts in this case since this length issue exists. That is providing the studs are long enough. The problem with them is that you have to pull the engine to take off the heads as there isn't enough room to lift the heads over the studs at least in my case. The studs should bite deeper into the block threads IMO.

Rich Kinsley '64 Dodge Polara 4dr 324 poly w/goodies

On Sun, Jan 29, 2012 at 8:20 PM, Richard Kinsley <rlkinsley@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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Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies

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Please address private mail -- mail of interest to only one person -- directly to that person. That is, send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!
 
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
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