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What's with the holes in the end of 360 exhaust manifold bolts? I saw something on this some time ago and can't remember what the answer was. 
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Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, TFI, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#." -
The only thing I can logically come up with is to allow for expansion without breakage.
Or they are pre-drilled for an 'easy out'.
David "If all else fails, read the instructions."
83 Wag Lt,BJ's 6"lift,360/727/Pinned229,D44/trac-lok,AMC20/lock-right,35/12.50 Baja MTZ,Pro-Jection EFI.
10$ NP229 fix http://www.ifsja.org/forums/vb/showthread.php?t=2520 -
I told My Dear Son that they're special lightweight racing bolts.
I'd guess that having open space in the center allows thermal movement to happen somewhere other than at the threads. So far, I've not had one of these break or back out significantly, and can't say the same for grade 8 or grade 5 solid screws in that application.
S.J."Carpe Mañana".
'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.Comment
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I thought the same about being predrilled for easyouts, but I have 2 heads that have them broke off flush with the face and the hole does not go that far into them. I still had to drill it for the easyout.
I think SJ's answer sounds more reasonable.
Jeff
'43 cj2a
'51 Willys p/u
'51 Willys Parkway Conversion
'68 Panel Delivery
'74 CJ5
'75 J-20 Wrecker
'75 J-20 Cummins service bed
'77 J-10 p/u
'79 Cherokee
'88 Grand Wagoneer
'98 Grand CherokeeComment
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Wonder if a bolt can be substituted with a stud, like various others do it. Can't see any reason why not.Jeepasaurus (Wagonus Grandi quadropedus)
88 GW 360-.030 over/2150/727/229/Posi, e-pump, AC (broke), tow package, Monroe Air Shocks, TFI, CTO-Free, AIR-free, oil & tranny coolers, dried knuckle blood all over, GM 350 TBI in a box, waiting...
"You're an FSJ'r when the parts guys memorize your name, phone & credit card#."Comment
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