Connecting Rods for a 1500WHP Engine?

[Excelerater]

any USA made billet rod will be good for 1500+ and no perf rod comes with a 3/8" bolt or none id use, always 7/16". Avoid china rods with USA names...

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[80FoxCoupe]

any USA made billet rod will be good for 1500+ and no perf rod comes with a 3/8" bolt or none id use, always 7/16". Avoid china rods with USA names...

Which rods are you running?

 

[Excelerater]

Which rods are you running?

GRP Aluminum but when I ran steel it was Carillo's or Lunati

 

[gimmie11s]

any USA made billet rod will be good for 1500+ and no perf rod comes with a 3/8" bolt or none id use, always 7/16". Avoid china rods with USA names...

The H Tuff's I put in my gen 3 build have 7/16 bolts. Not sure why earlier in the thread it was said they have 3/8s. Mine do not.

 

[80FoxCoupe]

The H Tuff's I put in my gen 3 build have 7/16 bolts. Not sure why earlier in the thread it was said they have 3/8s. Mine do not.

Per Manley...

 

[gimmie11s]

Per Manley...

yeah, ive seen that too. I kmow they take a 7/16 socket to assemble. Perhaps the bolt itself necks down.

Sucks because I went off the 7/16 torque spec when I put mine together which means if they're 3/8 I over torqued them.

 

[80FoxCoupe]

yeah, ive seen that too. I kmow they take a 7/16 socket to assemble. Perhaps the bolt itself necks down.

Sucks because I went off the 7/16 torque spec when I put mine together which means if they're 3/8 I over torqued them.

That is a likely situation. The rod bolt itself is for sure 3/8 thread, with a 7/16 bolt head. Very common for arp to do this.

 

[gimmie11s]

That is a likely situation. The rod bolt itself is for sure 3/8 thread, with a 7/16 bolt head. Very common for arp to do this.

Guarantee that's what it is then. Damn. Guess im dropping the oil pan! lmao


Doing some research, it looks like the 7/16 bolt is offered on this rod for LS1 applications, but not the coyote.. Ugh.

 

[80FoxCoupe]

Guarantee that's what it is then. Damn. Guess im dropping the oil pan! lmao


Doing some research, it looks like the 7/16 bolt is offered on this rod for LS1 applications, but not the coyote.. Ugh.

Better to know now where you can be proactive.

 

[illtal]

yeah, ive seen that too. I kmow they take a 7/16 socket to assemble. Perhaps the bolt itself necks down.

Sucks because I went off the 7/16 torque spec when I put mine together which means if they're 3/8 I over torqued them.

oh no....

 

[gimmie11s]

oh no....

Yep. To make things more confusing, I just dove down a rabbit hole about ARP 2000 3/8" rod bolts and the fact that some of them have been documented as requiring 85-100 lb/ft to achieve .0060 bolt stretch. Bolt stretch is the real measure you want to achieve when putting rods together, not some arbitrary torque wrench value.

So... 50/50 chance they are good how they are. Roll the dice or?

Haha.. ill probably pull the pan this weekend and pop a few rod caps off and see what we have.

If I was a betting man, it is fine and ill be wasting my time. But... right now at this moment, it's all I can think about.

 

[80FoxCoupe]

Yep. To make things more confusing, I just dove down a rabbit hole about ARP 2000 3/8" rod bolts and the fact that some of them have been documented as requiring 85-100 lb/ft to achieve .0060 bolt stretch. Bolt stretch is the real measure you want to achieve when putting rods together, not some arbitrary torque wrench value.

So... 50/50 chance they are good how they are. Roll the dice or?

Haha.. ill probably pull the pan this weekend and pop a few rod caps off and see what we have.

If I was a betting man, it is fine and ill be wasting my time. But... right now at this moment, it's all I can think about.

Oh dang it....

 

[illtal]

Yep. To make things more confusing, I just dove down a rabbit hole about ARP 2000 3/8" rod bolts and the fact that some of them have been documented as requiring 85-100 lb/ft to achieve .0060 bolt stretch. Bolt stretch is the real measure you want to achieve when putting rods together, not some arbitrary torque wrench value.

So... 50/50 chance they are good how they are. Roll the dice or?

Haha.. ill probably pull the pan this weekend and pop a few rod caps off and see what we have.

If I was a betting man, it is fine and ill be wasting my time. But... right now at this moment, it's all I can think about.

do you have the arp rod bolt stretch tool? i'd try to put that on to see if you got it right and not pop them off.

 

[gimmie11s]

do you have the arp rod bolt stretch tool? i'd try to put that on to see if you got it right and not pop them off.

Ive got a stretch tool on the way. When I assembled the motor I assembled to 90 lb/ft which is too high for these bolts. Manley is calling for 60lb/ft with motor oil.

However, Manley also calls for 58-62 thou bolt stretch and ive read it can take over 80 lb/ft to get those stretch numbers on these bolts.

We'll know soon enough I suppose....

 

[Cory S]

Ive got a stretch tool on the way. When I assembled the motor I assembled to 90 lb/ft which is too high for these bolts. Manley is calling for 60lb/ft with motor oil.

However, Manley also calls for 58-62 thou bolt stretch and ive read it can take over 80 lb/ft to get those stretch numbers on these bolts.

We'll know soon enough I suppose....

I think you meant .0058-.0062” stretch.

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