241 head bolt length?

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Dec 18, 2014 | 12:44 AM

sold horse,bought ss

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From: waterloo,al

241 head bolt length?

hey guys i got a question. i'm building a 98 ls1 engine and i bought a set of 241 head to put on them from a friend. do the 241's use the equal length head bolts or the different length head bolts and does anyone have the arp part number for the bolts i'd need? thanks in advance

Dec 18, 2014 | 10:44 AM

MikeZ28TA

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241 head bolt length

You will need kit 134-3609 from ARP. Two of the 15mm bolts which are 9 and 10 in torque sequence are a little shorter than the other 15mm. This is the Pre 2004 kit I believe. I used this same kit on my head install and I have 2001.

Dec 19, 2014 | 03:35 PM

JRENIGAR

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From: 72396

The bolt length diff is in the block years not the head casting #'s. 04 and up use the same length bolts. 03 and earlier use diff length bolts.

Dec 19, 2014 | 03:46 PM

01ssreda4

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From: Turnin' Wrenches Infractions: 005

It has to do with the block not the head as stated above. 04 was a transitional year, my 04 block uses the old style.

Dec 19, 2014 | 03:56 PM

JRENIGAR

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From: 72396

Quote:

Originally Posted by 01ssreda4

It has to do with the block not the head as stated above. 04 was a transitional year, my 04 block uses the old style.

Hmmm, didnt know that.

Dec 21, 2014 | 08:10 PM

sold horse,bought ss

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From: waterloo,al

thanks guys. i didn't know the blocks were the issue.

Dec 23, 2014 | 02:46 PM

SAPPER

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From: Halfway back on the Highway to Hell...again!

PLEASE, make absolutely sure all coolant is blown out of your bolt holes. That's the biggest killer of these blocks. 1/2" of fluid in the LS1 may crack it.

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Dec 24, 2014 | 01:13 AM

joecar

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From: So.Cal.

Quote:

Originally Posted by 03Sssnake

I did not either and I did a headswap last year...little worried now...

If you had the wrong bolt kit then you would know it.

Dec 24, 2014 | 07:40 AM

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SAPPER

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From: Halfway back on the Highway to Hell...again!

Quote:

Originally Posted by joecar

If you had the wrong bolt kit then you would know it.

Yep. In the early gen blocks the Med. bolts don't even reach the threads. If you had the long bolts in a late gen block, they'd bottom out about 5" above the head. I have 2 6.0 blocks on stands, one early, one late. I keep an old long bolt handy so I know which is which.
I guess I need to tag them to make it easier