Engine Parts - Page 2 - ZR-1 Net Registry Forums

bldavis11 · 10-06-2008

Okay, I'll bite. If we're going to make the bolts, I can pitch in for a set.

LGNDLT5 · 10-07-2008

Quote:

Originally Posted by LGAFF

Looks like the prior owner of my block may not be able to locate the head bolts.....was wondering if any knows of sources or am I stuck with paying Kurt White $47 per bolt.

Also will be looking for coolant tubes and an air horn as I move forward.....may need to find head bolts first.

LGAFF
92 ZR1
#234

I have the coolant tubes, OEM gaskets and the airhorn available, all NOS. Unfortunately not the head bolts. Let me know if you need them and we can work out something reasonable if desired.

John R. Sullivan 847-275-4841

A26B · 10-08-2008

I'm going to share a conversation I had with Graham Behan last May about this subject.

As I recall, Graham said they never actually measured the bolt length when installed, cold or hot. Due to the higher thermal coefficient of expansion, aluminum vs steel, the bolts will incur higher axial tension at engine operating temps than when installed at ambient conditions. Determining the difference in length would require flat grinding the ends of the bolt and using a sonic instrument to measure the differential length, cold to hot. With that information, stress on the bolt can be calculated to see if yield strength was exceeded. It could also be obtained by accurately measuring the length of a new bolt at std temp with a micrometer before install and again after it was removed from a heat cycled engine. If the length is greater after use, that would be an indicator of permanent deformation, and therefore exceeding yield strength of the bolt.

I came away with the impression that replacing the bolts after 1 use was an insurance policy factor as opposed to empirical testing data.

Would be interesting to know about head replacements with used bolts & the results.

Jerry

phrogs · 10-12-2008

I have a used set of head bolts if your interested.

Oh and I have never bought new bolts for the motors I have $50 a bolt I know im not the only one to reuse these head bolts

LGAFF · 10-13-2008

I sent a note to ARP to see if they can reproduce the head bolt....more to come.

LGAFF
92 ZR1
#234

Polo-1 · 10-13-2008

Ron Woods has the ARP studs. They are pricey $1250. they are made from the ARP 2000 rod bolt material. Im sure thay could have been made from 8740 moly and been much cheaper.

Ron and Randy's stuff is pretty top notch stuff.

http://www.zr1products.com/vendors.html

LGAFF · 10-13-2008

Holy Chit!
$1250 thats about what I have in to the entire motor

LGAFF
92 ZR1
#234

Polo-1 · 10-13-2008

$50 x 20 = $1000.00 for non reuseable bolts.

flyin ryan · 10-13-2008

ya...i was going to say something earlier. i've had ARP make me custom stuff lots of times & it's never cheap. they can do whatever a person wants but the super small run (volume) stuff ain't cheap. we get too used to their fasteners in the catalog that have part numbers attached, which are reasonable in price, IMO, but they sell hundreds of thousands of them to make up for it.

LGAFF · 10-14-2008

ARP says they have nothing that fits our application, they are asking for measurements....my guess is someone out there has these, any volunteers to give me the info?

I will e-mail quesitons to you.

LGAFF
92 ZR1
#234

10-06-2008	#11
bldavis11 Join Date: Mar 2006 Location: Portsmouth, VA Posts: 245	Re: Engine Parts Okay, I'll bite. If we're going to make the bolts, I can pitch in for a set.

10-08-2008	#13
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,403	Re: Engine Parts I'm going to share a conversation I had with Graham Behan last May about this subject. As I recall, Graham said they never actually measured the bolt length when installed, cold or hot. Due to the higher thermal coefficient of expansion, aluminum vs steel, the bolts will incur higher axial tension at engine operating temps than when installed at ambient conditions. Determining the difference in length would require flat grinding the ends of the bolt and using a sonic instrument to measure the differential length, cold to hot. With that information, stress on the bolt can be calculated to see if yield strength was exceeded. It could also be obtained by accurately measuring the length of a new bolt at std temp with a micrometer before install and again after it was removed from a heat cycled engine. If the length is greater after use, that would be an indicator of permanent deformation, and therefore exceeding yield strength of the bolt. I came away with the impression that replacing the bolts after 1 use was an insurance policy factor as opposed to empirical testing data. Would be interesting to know about head replacements with used bolts & the results. Jerry __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

10-12-2008	#14
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,761	Re: Engine Parts I have a used set of head bolts if your interested. Oh and I have never bought new bolts for the motors I have $50 a bolt I know im not the only one to reuse these head bolts __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything.

10-13-2008	#15
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: Engine Parts I sent a note to ARP to see if they can reproduce the head bolt....more to come. LGAFF 92 ZR1 #234

10-13-2008	#16
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 952	Re: Engine Parts Ron Woods has the ARP studs. They are pricey $1250. they are made from the ARP 2000 rod bolt material. Im sure thay could have been made from 8740 moly and been much cheaper. Ron and Randy's stuff is pretty top notch stuff. http://www.zr1products.com/vendors.html

10-13-2008	#17
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: Engine Parts Holy Chit! $1250 thats about what I have in to the entire motor LGAFF 92 ZR1 #234

10-13-2008	#18
Polo-1 Join Date: Sep 2005 Location: Washington Posts: 952	Re: Engine Parts $50 x 20 = $1000.00 for non reuseable bolts.

10-13-2008	#19
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,736	Re: Engine Parts ya...i was going to say something earlier. i've had ARP make me custom stuff lots of times & it's never cheap. they can do whatever a person wants but the super small run (volume) stuff ain't cheap. we get too used to their fasteners in the catalog that have part numbers attached, which are reasonable in price, IMO, but they sell hundreds of thousands of them to make up for it.

10-14-2008	#20
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: Engine Parts ARP says they have nothing that fits our application, they are asking for measurements....my guess is someone out there has these, any volunteers to give me the info? I will e-mail quesitons to you. LGAFF 92 ZR1 #234 Last edited by GOLDCYLON; 10-14-2008 at 05:20 PM.

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