Production 4.1 291 Build

[Ken Adams]

I plan to build a factory production 4.1 in the near future. Need info regarding which ARP head studs I need to use, when mounting ported production heads to the 4.1 block. Also, which ARP main studs should be used.

 

[Nick Micale]

Call TA Performance and Tim will set you up with the correct stud kits.

 

[earlbrown]

The main studs are 123-5401

and the head studs are 123-4001

 

[Ken Adams]

Earl, can your verify the ARP head studs part # please.? Thanks

 

[jdpolzin]

What are you going to use for pistons?

 

[Ken Adams]

What are you going to use for pistons?

What pistons do you suggest?

 

[earlbrown]

Earl, can your verify the ARP head studs part # please.? Thanks

I read them off the boxes that I used on my personal 4.1.

 

[jdpolzin]

Earl, you listed the same part number for main studs and head studs is why he is asking. The part number you listed is for the mains.

 

[jdpolzin]

What pistons do you suggest?

I'm having Earl build mine for my 4.1 NA build. I bought a set of 4" bore Ross pistons that are good for a turbo build that I won't be using. If interested, shoot me a PM. But, Earl can build you a set as well.

 

[earlbrown]

Earl, you listed the same part number for main studs and head studs is why he is asking. The part number you listed is for the mains.

Ooops. I fixed it.

 

[434nova]

Ooops. I fixed it.

Earl what heads are you running? Do the aluminum heads require a different head studs?

 

[earlbrown]

I'm running ported stock castings. With alum heads, it'll depend on what the boss height is.

4.1's take shorter studs/bolts since the deck holes aren't countersunk. If you have heads that are taller than stock, a set of 3.8 studs might be the right length for 4.1s with taller heads.


Moral of the story.... MAKE SURE the hardened washer get loaded before running out of threads.

 

[Ken Adams]

Earl, Thank you