i installed a set of AFR 195cc heads a month ago well i blew a head gasket "my fualt" i didnt retouqe well how many time do u suggest to retoqe this time i gave car to warm up cool downs "ran car for about 15-20 min each time then i let it get cool and retorqed em is this good or should i do again its such a pain in the a$$ retorqeing heads with my hooker long tubes thanks

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1992 camaro RS
195cc AFR heads with compition port work milled to 58cc "10.9 to 1 compression"
373 10 bolt rearend
ssm sfc's
87 350 TPI
bored 30 over
compucam 2032 with 1.65 full roller rockers
497-510 LIFT 214-220 duration
msd6AL
1 5/8 headman headers
2 `1/2 flowmaster exuast
k&n filters gutter air box gutted maf"no fins no screens"
3 pc under drive pulleys
no emissions no egr etc
custom ED Wright chip
eddelbroc intake base and runners ported plenum
accel 8.8mm wires
B&M mega shifter
gutted maf/airbox
hotchkis lower control arms
3" exhuast cutout
homemade cold air intake
2000 tci stall
700R4 with B&M shift kit edelbrock water pump
new best ET 13.5 @104.66
no times with new afr heads hoping for 12's on motor
Nos to be installed soon

 

What head gaskets are you using? I used the FelPro 1010's and never retorqued. Right now the car is apart and I will probably retorque them. You only need to do it once. Let the car heat up to operating temp. Let it fully cool. Retorque. Done.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

I've never had to retorque heads. What kind of bolts are you using ? and what are you putting on the threads?

 

I´ve also changed heads and I´m thinking of
retorquing the heads. But if you do, what
about the thread sealer on the bolt-threads,
does it work or do you have to put thread
sealer again?
BenIroc
89 Iroc, TFS heads

 

Whne I was running TFS heads, I just used Corvette L98 head bolts that already came teflon coated. I also never had to retorque.

What head bolts were you using Tim on those AFRs???

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http://members.home.net/regulators/kevg.html
-=ICON Motorsports=-

 

I did not retorque either set of aluminum heads that I put on my engine.

I used FelPro 1010 head gaskets and torqued down the haed bolts in the specified sequence in three passes, each pass at a higher torque value, 45, 60 then 75 (if I remember correctly). Also, you got to hardened thick washers.



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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(58psi), K&N filters, Hotchkis lowering springs, my custom chip, Lay Ind. ram air kit, SS Brakes 1LE upgrade 12" rotors dual piston calipers, 265/45R16 Kumho V700 tires.
ET 13.39sec @ 107.21mph
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter, next mod: 4.10 rear gears
313.7Hp & 320.6ft-lbf, ET 13.55sec @ 105.1mph

 

Again - I never retorqued. However, since FelPro recommends to retorque on 'performance oriented engines' I am contemplating doing the 'retorque' thing after I get my most recent mods done. But, I may not - who knows

You do not have to worry about the thread sealer on the bolts AS LONG AS you used a non hardening sealer like ARP's Teflon sealant.

Kev - I am using ARP 12-point head bolts with hardened washers.

It is recommended to torque to 65ft/lb with aluminum heads. I torque to 75 which can be slightly dangerous depending on the heads. The AFRs are really thick castings and won't warp like the L98 aluminum heads. So, I can get away with a little more torque.

Tim

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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

I've done three sets of aluminum heads and never re-torqued them. I just bought a set of AFR heads and they only say to re-torque if you are running high compression , nitrous or a SC.

 

Is it possible that your deck surface of the block could be warped?
Have you had your torque wrench recalibrated anytime in the near past? It may need it, especially if it is a "click" type and if it has been stored or left on any setting besides 0.

Also, besides the basic three step torquing, it is a good idea to come back several hours (or the next day) after torquing and back off the fasteners 90° and torque again. They will usually pull down a little more than they did the first time even though the same torque spec is used.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
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