[Chevelle SS 396/375]

Ok, I've been busy collecting parts for my build, most recently looking into the rocker arms & pushrods to use. After much research and sole searching, I've decided to go with Comp Cams 1.72 Magnum Rocker Arms & Magnum Pushrods. One of the 840 Heads I sourced came with rocker studs that are the standard 7/16"-14 bottom, 7/16"-20 top threads with an overall length of 2.5x" (just a hair over 2.5" as I measured). I am assuming the studs are original GM since the head looks to be very original throughout. The guide plates also look to be original (and in good shape) - but I only have 4.

While speaking with Summit sales, I couldn't find any rocker studs that were 2.5" OAL. (Overall Length), so I went with 1.9" OAL, as that length seems to be one of the most cited in ads for BBC engines, etc. But, I may be going in the wrong direction with a shorter stud.

My questions are:

1. For the 396 Special High Performance Engine, what is the Length of the GM rocker studs (originally)? Length might not vary across the various horsepower spec'd engines. I'd just like to know what length was specified originally by GM? It may vary based on the cam used obviously. An L78 cam spec with slightly higher lift is what I am going with (Howards Cam).

2. Assuming I stay with the longer rocker stud length of 2.5", where can I get them?

Thanks for your help on this,

John

 

[steelcomp]

Ok, I've been busy collecting parts for my build, most recently looking into the rocker arms & pushrods to use. After much research and sole searching, I've decided to go with Comp Cams 1.72 Magnum Rocker Arms & Magnum Pushrods. One of the 840 Heads I sourced came with rocker studs that are the standard 7/16"-14 bottom, 7/16"-20 top threads with an overall length of 2.5x" (just a hair over 2.5" as I measured). I am assuming the studs are original GM since the head looks to be very original throughout. The guide plates also look to be original (and in good shape) - but I only have 4.

While speaking with Summit sales, I couldn't find any rocker studs that were 2.5" OAL. (Overall Length), so I went with 1.9" OAL, as that length seems to be one of the most cited in ads for BBC engines, etc. But, I may be going in the wrong direction with a shorter stud.

My questions are:

1. For the 396 Special High Performance Engine, what is the Length of the GM rocker studs (originally)? Length might not vary across the various horsepower spec'd engines. I'd just like to know what length was specified originally by GM? It may vary based on the cam used obviously. An L78 cam spec with slightly higher lift is what I am going with (Howards Cam).

2. Assuming I stay with the longer rocker stud length of 2.5", where can I get them?

Thanks for your help on this,

John

The ARP 135-7101 is 2.550 OAL with 1.750 above the guide plate and .800 course thread in the head. They call it a "typical BB Chevy rocker stud".

 

[Chevelle SS 396/375]

Thanks for that! I hadn’t found anything yet and Ole on here sent me a link for some of these studs on eBay.....SOLD!

So thanks to Ole & you!!!

John

 

[Aml383]

Ok, I've been busy collecting parts for my build, most recently looking into the rocker arms & pushrods to use. After much research and sole searching, I've decided to go with Comp Cams 1.72 Magnum Rocker Arms & Magnum Pushrods. One of the 840 Heads I sourced came with rocker studs that are the standard 7/16"-14 bottom, 7/16"-20 top threads with an overall length of 2.5x" (just a hair over 2.5" as I measured). I am assuming the studs are original GM since the head looks to be very original throughout. The guide plates also look to be original (and in good shape) - but I only have 4.

While speaking with Summit sales, I couldn't find any rocker studs that were 2.5" OAL. (Overall Length), so I went with 1.9" OAL, as that length seems to be one of the most cited in ads for BBC engines, etc. But, I may be going in the wrong direction with a shorter stud.

My questions are:

1. For the 396 Special High Performance Engine, what is the Length of the GM rocker studs (originally)? Length might not vary across the various horsepower spec'd engines. I'd just like to know what length was specified originally by GM? It may vary based on the cam used obviously. An L78 cam spec with slightly higher lift is what I am going with (Howards Cam).

2. Assuming I stay with the longer rocker stud length of 2.5", where can I get them?

Thanks for your help on this,

John

You won't know what length studs you need until you determine what length pushrod you need .
To calculate that follow the mid lift formula provided in Scott foxwells video .
Keep the magic marker in the drawer for this one well other than for maybe marking the side of the rocker . No need to smear the top of the valve with a marker though lol
If heads are stock you should be ok with stock length pushrods

 

[shovelrick]

I'd of gave you a set that had 22,4xx miles on them, they're just laying in a box of spare parts I'm sure I'll never use EDIT I think the ones in the box are new Brodix studs, Nope I still have them

 

[Chevelle SS 396/375]

You won't know what length studs you need until you determine what length pushrod you need .
To calculate that follow the mid lift formula provided in Scott foxwells video .
Keep the magic marker in the drawer for this one well other than for maybe marking the side of the rocker . No need to smear the top of the valve with a marker though lol
If heads are stock you should be ok with stock length pushrods

The heads are stock and the block hasn’t been decked. I’ll leave it up to the engine builder. But I’ve learned a lot researching things.

 

[Aml383]

The heads are stock and the block hasn’t been decked. I’ll leave it up to the engine builder. But I’ve learned slot researching things.

Oh ok if you've got an engine builder then
why are you on here asking about a rocker stud length ?
Are you questioning what he's telling you ?

 

[Chevelle SS 396/375]

Oh ok if you've got an engine builder then
why are you on here asking about a rocker stud length ?
Are you questioning what he's telling you ?

No not at all. It's my engine, and I want to know as much as possible before I turn the builder loose. I'd like to build it myself, but that's not in the cards or wise. That doesn't mean I don't want to know as much as possible about the build. The more parts I buy the less the builder will need to buy. Besides it's fun! If it wasn't fun I wouldn't do it! My block is 1 of only 596 built in 1967...I owned one of the other "EG" blocks that came in my '67 Chevelle SS. My car is long gone sadly....I looked for it for many years. This is a trip back in time for me. Better late than never right? LOL!

 

[Chevelle SS 396/375]

Just to close this thread out, I ended up buying the ARP studs as discussed above, however the Comp Cams studs just arrived and I can return them but they are the same length as the ARP’s! It appears the guy at Summit wasn’t all that knowledgeable as the ones I was looking at & ordered are also 2.58” O.A.L. I’ll use the studs that the builder likes best. Thanks to all who posted suggestions.

John

 

[Aml383]

Just to close this thread out, I ended up buying the ARP studs as discussed above, however the Comp Cams studs just arrived and I can return them but they are the same length as the ARP’s! It appears the guy at Summit wasn’t all that knowledgeable as the ones I was looking at & ordered are also 2.58” O.A.L. I’ll use the studs that the builder likes best. Thanks to all who posted suggestions.

John

You don't say !
The guy at summit wasn't very knowledgeable ?? LOL
id have been very surprised to hear the opposite actually.
.check out there video on how to set up pushrod length and that explains the company as far as what thier knowledge in general is