Has anyone ever replaced them just for safty sake? Or has anyone came up with stronger ones ( I wish ARP would help us out).

 

When I had my 690 done I believe they put stronger ones and retapped the threads but I dont know for sure. I just take my stuff to the shop and they do it. I wish I could do it myself and save TIME and money.....[img]i/expressions/face-icon-small-sad.gif[/img]

 

RaptorOwner, I sometimes wish I had the $ to take it somewhere! But I know I wouldn't be happy.

 

In a perfect world they should be replaced every time . When you pull a bolt to toque it stretches the threads some what they will eventually loose there draw or "elastic state " and stretch out or go " Plastic " on you .
I believe the YFZ head bolt are ( toque to yield ) and they definitly should only be used once .
One other thing id you are reusing nuts flip them over sounds crazy but the threads will flex back the other direction

 

Thanks Outlaw, That's kinda what I thought I just wanted to know if I was dreaming or that I actually heard that somewhere.

 

well the head bolts dont stretch that much its the threads in the aluminum that are pulling out over time. the holes are only good for 3- 4 torque sessions. then will require heli-coils. DO NOT run a tap into the threads to clean them up because it will take material away that is used to hold the bolts in. you must use a thread chaser.

 

Well that sound like something that would happen to me![img]i/expressions/face-icon-small-mad.gif[/img]

 

Sparkskiller I disagree . All bolts stretch . When you torque a bolt you are stretching it and it is pulling back like a rubber band . If you over torque it loses it's elastic state and fails to pull and then it just keeps on stretching . Thats why torque values are so important . Also the cases (aluminum) are enginered with a certain amount of draw area to offset the bolts pull . I have had aluminum blocks that have had countless tear downs and reapps with NO failures .
Just always make sure the bolts or studs are lightly lubed You can still use locktite if nessacary but in small amounts .

 

I'm running the stock bolts.......but they are heli coiled

 

I've had mine aprat 4-5 times, it still runs like a charm with a 660.......