Underboost
Mr. Dull
- Joined
- Oct 4, 2005
Nope no blowing HG's, the car is running 790 O2's, Around 1620 EGT's, No knock @ 28psi with a 70GTQ 85. housing .The Iron heads just don't conform to the block like Aluminum Heads would.
Anybody run 9's with a factory heads?
- Thread starter HOOGENRAAD
- Start date
Nope no blowing HG's, the car is running 790 O2's, Around 1620 EGT's, No knock @ 28psi with a 70GTQ 85. housing .The Iron heads just don't conform to the block like Aluminum Heads would.
aaaahhhhhh, i see..... i guess i hve to invest some money in some aluminum heads......thanks:biggrin:Nope no blowing HG's, the car is running 790 O2's, Around 1620 EGT's, No knock @ 28psi with a 70GTQ 85. housing .The Iron heads just don't conform to the block like Aluminum Heads would.
Underboost
Mr. Dull
- Joined
- Oct 4, 2005
Some guy's like Walt Judy have mastered the Iron heads with 9.60 passes.
That is just awesome!My goal was to try and run 9's with A/C, Irons, and an ECM in a full weight car. But I'm just sick of the constant HG issues. There's not enough tracks around here to test & tune. When we all go out to a track around here which is few and far between, you want to run the car and have fun like "NORDY RACER". Not run the car a couple of times only to find out you need a re torque and have to wait 2 months for another 1/4 track date. Thats why I'm going to Alum Heads.
What track do you go to up there? Sonoma?
I would love to plan a trip up there.
Even though Sears Point (Infineon) is closer i go to Sacramento Raceway.
nordy racer
Active Member
- Joined
- Aug 2, 2004
do i see a road trip coming up Brent???
Dammm
what are you running to tune it ???? chip?? Fast ?? maybe use some JBweld on them At what mph did you start lifting the heads with zero KR? You mentioned 4* earlier. If there is any at that power level the heads will lift. I have my car dialed in to 126mph at 3600lbs on a set of thin RJC's and have ran it through 3rd gear at WOT at least 200 times since i put it together in early August. It has 2500 miles since then also. I have not had any KR even on 93 and 24.5 psi boost where i leave it all the time. There has not been one instance of even little compression in the cooling system. Are your combustion chambers pinned on the intake and exhaust side? Mine arent but i think it is a worthwhile investment for 130mph plus.
Underboost
Mr. Dull
- Joined
- Oct 4, 2005
Dammm
A Turbo Tweak and all of this. LOL :tongue:
ttypewhite
Well-Known Member
- Joined
- Oct 1, 2001
Some guy's like Walt Judy have mastered the Iron heads with 9.60 passes.
My goal was to try and run 9's with A/C, Irons, and an ECM in a full weight car. But I'm just sick of the constant HG issues. There's not enough tracks around here to test & tune. When we all go out to a track around here which is few and far between, you want to run the car and have fun like "NORDY RACER". Not run the car a couple of times only to find out you need a re torque and have to wait 2 months for another 1/4 track date. Thats why I'm going to Alum Heads.
I have never had a issue keeping down my irons before, and I was pushing 30psi through them with a loose converter. I don't believe changing to Aluminums is going to solve your sealing issue. I am not a fan of lockwiring the heads. Alot of problems can start with the lockwire in the head not conforming to the gasket properly and seeping out cylinder pressure. And where the center cylinders are on both sides of the motor looking from underneath the car you will see carbon blowing out the side of the gasket. I have had that issue before in the past with aluminums doing it the same way you explained (with M&A heads) and under 22psi it was a missle. Anywhere above that would lift the head and blow out the side. So I went back to the irons and ran bottom 10's. Now I use heads studs, Cometic gaskets, aluminum heads torqued to 70ft and ran 25 psi on my 9sec pass. I have run 30psi on a return trip to the track looking to better my et, but ended up snapping a rocker in the process. But no more problems sealing aluminum heads with 30psi after 2 and a half years of hard beatens. Just make sure both block and heads surface are flat and you torque them down with a accurate torque wrench.
.The Iron heads just don't conform to the block like Aluminum Heads would.
Are your heads pinned as stated by bison ???? It helps stop distortion...
You're not alone brudda. :wink:
Underboost
Mr. Dull
- Joined
- Oct 4, 2005
134MPH @ 28psi "4" 1/4 runs and the heads lift. :frown:
During this elimination round against Chris the heads lifted also
When I got back home I tried setting the world on fire with a GTQ-72 w/ 85. and new stock head gaskets.
The 3,500 "O" stall I have hated it. When that failed I put the 70-GTQ back on, the car came to life. While tuning the GTQ-70 with my old parameters I got 4* KR. :frown: stock HG's blew. I now have the motor apart, reason A: all the graphite from the stock HG in the pick up & B: Might as well check the motor while its out. Nope, but that does sound like a great idea.
I'll do that while the motor is apart.Underboost
Mr. Dull
- Joined
- Oct 4, 2005
I have the block, and heads at the machine shop. My custom SCE Titan gaskets will be arriving on Fri. from that point the machining of receiver groove and O-ringing will be done to match the HG's. This is the set-up TSM Dick K is running.
Underboost
Mr. Dull
- Joined
- Oct 4, 2005
They are pinned to the block but not the intake.
Similar threads
