1stGen.org

by **cummins king** » Fri Dec 07, 2007 8:50 pm

do you think that the head studs fr a 24v would be the same for a 1st gen 12v, sorry i have no idea

by **ford69557ci** » Fri Dec 07, 2007 9:08 pm

no the 24v are a different head design different bolt lengths and a 24v set is usually more expensive than 12v

by **cummins king** » Sat Dec 08, 2007 6:57 am

thanks
the reason i was asking there is a guy on ebay selling a bran new set of 24v arp head studs cheap
thank mr ford

by **CumminsPride** » Sat Dec 08, 2007 7:37 am

Yeah they are more expensive but it is also the same block so I would verify thread size and count as well as length cause you could probably cut them down then just back a nut over the cut end?

Wade

by **ford69557ci** » Sat Dec 08, 2007 9:56 am

i think it might destroy a couple of expensive dies tryin to thread hardened bolts

by **CumminsPride** » Sat Dec 08, 2007 10:25 am

Why would you rethread the studs? The block threads are the same aren't they? My thought was the studs were the same other than length. Why couldn't you just shorten one side of them?

Wade

by **TWorline** » Sat Dec 08, 2007 10:47 am

There are 2 different diameter studs for the Cummins engines in our trucks 12mm and 14mm. I do not remember when they changed though.

by **JD730** » Sat Dec 08, 2007 11:37 am

CumminsPride wrote:Why would you rethread the studs? The block threads are the same aren't they? My thought was the studs were the same other than length. Why couldn't you just shorten one side of them?

Wade

You can't run a die on them, ARP rolls the threads. 24valve studs are all the same length, the 12valve uses 3 different stud lengths.

TWorline wrote:There are 2 different diameter studs for the Cummins engines in our trucks 12mm and 14mm. I do not remember when they changed though.

As far as I know all the threads in the block for the head are 12mm, 14mm are available, but machine work is neccessary to install them.

by **CumminsPride** » Sat Dec 08, 2007 11:46 am

I C Now/ but are the longest 12 valve studs longer than the any of the 24vavle studs?

Wade

by **KTA** » Sat Dec 08, 2007 1:20 pm

Yes 6 are.

by **CumminsPride** » Sat Dec 08, 2007 2:22 pm

Thank you for the clarification. I have never seen a set of 24v studs.

Wade

by **TWorline** » Tue Dec 11, 2007 6:11 pm

[quote="JD730As far as I know all the threads in the block for the head are 12mm, 14mm are available, but machine work is neccessary to install them.[/quote]

Sorry I was thinking of the crank main cap studs.

by **burnt_servo** » Fri Jan 18, 2008 2:26 pm

TWorline wrote:There are 2 different diameter studs for the Cummins engines in our trucks 12mm and 14mm. I do not remember when they changed though.

so your saying that there are some first gen trucks out there with 14mm head bolts from the factory ?

by **LOGANSTANFORTH** » Sun Jan 27, 2008 9:56 pm

no.......12mm's will fit factory, no truck came with 14's, you got to machine the block for them to fit.....

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