Source for shorter flywheel bolts - ZR-1 Net Registry Forums

hihok9 · 05-03-2010

Replacing the dual mass flywheel with hydraulic bearing throwout system and see the bolts are now an inch too long for aluminum flywheel. I'm sure many of you have run into this. The bolts I need are about an inch shorter (or an inch long) with the shallow heads like the originals. Has anyone got a source for these? Thanks in advance!

Hiho

hihok9 · 05-03-2010

Just did a search of the forum (should have done that first) and see 7/16 X 20 X 1 1/4 bolt was common replacement with aluminum flywheel. Suggested thicker washer (mine had none) so I would assume that the height of the head does not matter and standard grade 8 will do?

todesengel · 05-03-2010

I would suggest a grade 11 for all flywheel bolts. I would check out arp's offering's, they do not require washers, and have many different lengths and thread pitch. Arp is about all I use on all my cars, to the point of tossing even the factory pieces when going with stock flywheel.

http://www.summitracing.com/search/b.../?autoview=SKU

65ZR1 · 05-03-2010

I believe what you want are three sets of chevy torque convertor bolts from ARP. I think they are 7/16-20 by 1.25 long. I forget the part number but I can get it for you.

hihok9 · 05-03-2010

Let me know if you find a #. I see the previous one comes in set of 6. I need two sets as there are 8 bolts. I'll assume it is the correct 20 thread. 65ZR1 I'll wait to hear on the others, hope your project is coming along well!

todesengel · 05-03-2010

I believe these are what he is referring to

http://www.jegs.com/i/ARP/070/230-7303/10002/-1

65ZR1 · 05-03-2010

Project is coming along but too slow. You are going to beat me! A quick check of the catalogue makes me think it is part number 230-7303. They are 7/16-20 by 1.25, come in sets of three and have the hardened washers. The washer is a good idea with an aluminum flywheel. If nobody confirms this I will tomorrow when I go work on the car.

bldavis11 · 05-03-2010

when in doubt, there is always McMasters. They have just about everything.

hihok9 · 05-04-2010

Thanks guys! I had an issue with the boss on the bellhousing hitting the floor right at the gas pedal on my project so the boss for the slave had to be cut off and the hydraulic throwout clutch package was an expensive but easy fix. Motor top apart for paint and removal of secondaries right now. Chassis powdercoated and all aluminum running gear shot with clear. E Brake fabricated and stainless tank installed as well. Making progress as time allows.

05-03-2010	#1
hihok9 Join Date: Jul 2005 Posts: 49	Source for shorter flywheel bolts Replacing the dual mass flywheel with hydraulic bearing throwout system and see the bolts are now an inch too long for aluminum flywheel. I'm sure many of you have run into this. The bolts I need are about an inch shorter (or an inch long) with the shallow heads like the originals. Has anyone got a source for these? Thanks in advance! Hiho

05-03-2010	#2
hihok9 Join Date: Jul 2005 Posts: 49	Re: Source for shorter flywheel bolts Just did a search of the forum (should have done that first) and see 7/16 X 20 X 1 1/4 bolt was common replacement with aluminum flywheel. Suggested thicker washer (mine had none) so I would assume that the height of the head does not matter and standard grade 8 will do?

05-03-2010	#3
todesengel Join Date: Apr 2010 Location: O'Fallon, Mo Posts: 738	Re: Source for shorter flywheel bolts I would suggest a grade 11 for all flywheel bolts. I would check out arp's offering's, they do not require washers, and have many different lengths and thread pitch. Arp is about all I use on all my cars, to the point of tossing even the factory pieces when going with stock flywheel. http://www.summitracing.com/search/b.../?autoview=SKU Last edited by todesengel; 05-03-2010 at 03:31 PM.

05-03-2010	#4
65ZR1 Join Date: May 2006 Location: Canada Posts: 139	Re: Source for shorter flywheel bolts I believe what you want are three sets of chevy torque convertor bolts from ARP. I think they are 7/16-20 by 1.25 long. I forget the part number but I can get it for you.

05-03-2010	#5
hihok9 Join Date: Jul 2005 Posts: 49	Re: Source for shorter flywheel bolts Let me know if you find a #. I see the previous one comes in set of 6. I need two sets as there are 8 bolts. I'll assume it is the correct 20 thread. 65ZR1 I'll wait to hear on the others, hope your project is coming along well!

05-03-2010	#8
bldavis11 Join Date: Mar 2006 Location: Portsmouth, VA Posts: 245	Re: Source for shorter flywheel bolts when in doubt, there is always McMasters. They have just about everything.

05-04-2010	#9
hihok9 Join Date: Jul 2005 Posts: 49	Re: Source for shorter flywheel bolts Thanks guys! I had an issue with the boss on the bellhousing hitting the floor right at the gas pedal on my project so the boss for the slave had to be cut off and the hydraulic throwout clutch package was an expensive but easy fix. Motor top apart for paint and removal of secondaries right now. Chassis powdercoated and all aluminum running gear shot with clear. E Brake fabricated and stainless tank installed as well. Making progress as time allows.