| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
08-23-2019, 08:20 PM
|
||||
|
||||
head gasket re-torque
Just got the 403 back together with new Cometic head gaskets. Plan to fire it up tomorrow to make sure everything is okay. What do you guys recommend as far as when to re-torque? A certain # of heat cycles or miles or 1/4 passes?
__________________
69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
|
#2
08-23-2019, 09:14 PM
|
||||
|
||||
|
I was always been told after the first heat cycle
|
|
#3
08-24-2019, 05:33 AM
|
||||
|
||||
|
I can't say what others do but I re-torque next day after the first warm up, then after the first meeting,then a couple of times per season. Loosen and re-torque one nut at a time following the factory tightening pattern.
|
|
#4
08-24-2019, 10:07 AM
|
||||
|
||||
|
Quote:
GTO George |
|
#5
08-24-2019, 03:14 PM
|
||||
|
||||
|
Thanks guys, I should be ready to get that done tomorrow.
__________________
69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
|
#6
08-24-2019, 03:37 PM
|
||||
|
||||
|
Quote:
|
|
#7
08-25-2019, 07:21 AM
|
||||
|
||||
|
Paul, thanks for the input. I have gotten differing opinions on this subject; some say retorque even with the Cometics and as you say it is not recommended by Cometic. I thought about switching to studs but decided at my power level it was not needed. The old set of Cometics lasted 7 years and probably would have lasted longer if there hadn't been an issue with the heads. My machinist had to take .006 off the face because they were high in the middle. The fire ring on these Olds heads is really narrow and especially after the .024 overbore. There is no margin for error.
__________________
69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
