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Re-torque guidlines on heads

  • Thread starter Thread starter Nicoleb3x3
  • Start date Start date Aug 5, 2009

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Aug 5, 2009
#1
  • Aug 5, 2009
  • #1
I recently rebuilt my engine and I'm going back to re-torque my head studs.
I've probably run close to 400-500 miles without going back to re-torque yet; but I've driven the car very mildly (under 3 grand) except for a few dyno pulls.

Needs some guidelines (I want to be super cautions that I do don't mess this up because I really don't want blow a head gasket later on)



-does it matter that I've gone 400-500 miles already? shouldn't right?

-I assume I re-torque in sequence and I shouldn't back off anything at all but simply be checking the torque rating is still 85ft lbs.

-does it matter that the lower intake is installed? how does that affect torque ratings with the added pressure of the lower? I certainly hope this doesn't matter.

-Has anyone used ARP 7/16 studs, do the bottom need to be higher torque? because the instructions said 85 ft lbs with moly, it didn't say to do the lower different than the upper row. I think the ARP studs have different tension to make up for the wedge factor?
---->Now; if I have all of them at 85 ft lbs and someone says I should be running higher torque on the bottom row even with these ARP studs...what does that mean for re-torqueing? because adding 5 ft lbs now won't be evenly distributed because I'm adding +0 to the top and +5 to the bottom that woudn't be an even increment accross the sequence? Course I'm hoping both rows can be 85 ft lbs and I should not worry about this!

-If I'm going with a super charger next year, should I retorqe to a higher rating? I'm expecting to see 380 hp to the wheels. Should I just go with the 85 ft lbs with moly that the ARP instructions say? I guess I feel that If I increase it now to over 85 ft lbs then I would have to retoque again later on because of the increased number would need to be checked again....I don't want to go through that if it's not nessasary

Sorry I have so many stupid questions, but I will super pissed If I screw this up. I've good luck so far with this build I want to keep it that way!
 

BlownFiveLiter

have car, will race....wait, it doesn't run
15 Year Member
Nov 29, 1999
3,133
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108
Chicagoland
Aug 5, 2009
#2
  • Aug 5, 2009
  • #2
You honestly could get away with never retorquing them. The factory didn't do it. Mine have a couple years' worth of usage and were never touched since they were initially installed. Mine were just done by TFS's instructions (85 on the uppers, 75 I think on the lowers). If you haven't had any issues yet related to the headgaskets, you're not going to as a result of the torque specifications you used.
 
V

v8only

Active Member
Jul 3, 2003
2,378
22
49
Aug 6, 2009
#3
  • Aug 6, 2009
  • #3
arp bolts don't require a retorque...not as sure about studs
 

BlownFiveLiter

have car, will race....wait, it doesn't run
15 Year Member
Nov 29, 1999
3,133
18
108
Chicagoland
Aug 6, 2009
#4
  • Aug 6, 2009
  • #4
v8only said:
arp bolts don't require a retorque...not as sure about studs
Click to expand...

Mine weren't retorqued. I suppose I probably should've mentioned that I had studs.
 

EMW150

Founding Member
May 22, 2000
2,020
1
46
Roaring Spring,PA
Aug 6, 2009
#5
  • Aug 6, 2009
  • #5
I never retorque them. I think you pose a risk of breaking the seal on the lower studs (Many use RTV) causing a coolant leak. If you used good quality ARP studs, I'd skip it.
 

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Aug 6, 2009
#6
  • Aug 6, 2009
  • #6
hmmmmm

guess I'll leave it as is
 

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Aug 6, 2009
#7
  • Aug 6, 2009
  • #7
also; fyi the factory didn't re-torque because they use torque to yield bolts...they're designed to use onen time only

technically you're supposed to retorque bolts or studs that are not torque to yield...however...I think about distrubing the coolant passage threw hole bolts that have thread sealer.....I used regular thread sealer and not rtv..I don't think it was a hardening compound..but.....I don't want to make problems for myself either
 

ShortThrow50

Member
Oct 22, 2006
923
2
16
Pa
Aug 6, 2009
#8
  • Aug 6, 2009
  • #8
you can retorque them if you want but its not gonna turn any
 

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Aug 6, 2009
#9
  • Aug 6, 2009
  • #9
decision is made..I'm leaving it alone
 
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