[john marcella]

Originally Posted by Glenn Sedig

New inserts where tried at Cordova on Fri and Sat for the West Q-8 bracket race. Stars where aligned correctly and won the race. Have to believe the inserts worked very well as this engine has never been this consistant except for the first several runs after changing the head gaskets.

Fri 4500 launch rpm--------60ft

1st run-8.82 @153.96-----1.302
2-------8.84 @153.30-----1.303
3-------8.83 @153.61-----1.293

Sat 5500 launch rpm

1st------8.76 @152.76-----1.241
2--------8.77 @153.44-----1.250
3--------8.76 @153.70-----1.252 elimination run
4--------8.75 @153.35-----1.253 elimination run
5--------8.75 @153.65-----1.246 elimination run

For the car to be this consistant I am quite sure there was no insert problem or head gasket leak. We are checking leak down today to see if there are any changes.

Good deal Glenn. Congrats on the win as well
I was sceptical at first but it is looking like my initial thoughts were wrong. Ya learn something every day

[Jeff Kinsler]

congratso on the win. how much were you weighing ?

[Glenn Sedig]

Originally Posted by Jeff Kinsler

congratso on the win. how much were you weighing ?

You probably wouldn't believe 3195 lbs. So I won't lie. 2950 lbs

[Jeff Kinsler]

Originally Posted by Glenn Sedig

You probably wouldn't believe 3195 lbs. So I won't lie. 2950 lbs

dont lie to me!! LOL.. i think it was 3195!!

good job

[Glenn Sedig]

Leak down before the inserts were installed, and with 15 runs on the old gaskets, on cyl 3 & 5 was 15%. On cyl 4 & 6 was 8%. The heads were installed with new gaskets. The cylinders heads were flat with no bad areas except between the center cylinders. I got more than 15 runs (more like 30 runs) when the heads were new and no deformation had occurred in the center area.

The inserts where installed to sit .001 above the head surface. The heads have not been surfaced since new. The leak down after the 8 runs - 3 & 5 is 2% 4 & 6 is 3%

Engine is 473 Cu in, 14.5:1 comp. N/A

I need to clarify the engine consitency. Along with the inserts and new head gaskets, I changed my valve lash from .026 cold to .010 cold. Hoped to achieve .018 when hot. I believe the lash change and the fact that the track was prepped before each Q - 8 session also helped with the consitency.

[60man]

Thanks for the info Glen..I don't have a leak down handy ( misplaced it?) so I'm going to check compression with standard gauge...to get an idea of any present issues..??
I ran a comp. check prior to past week ends passes..

[Glenn Sedig]

Originally Posted by 60man

Thanks for the info Glen..I don't have a leak down handy ( misplaced it?) so I'm going to check compression with standard gauge...to get an idea of any present issues..??
I ran a comp. check prior to past week ends passes..

It would be good if you can find your leak down tester. The compression happens so fast when you crank your engine over that it is hard to tell if the gasket is starting to leak. If the gasket is bad and you put the cyl at TDC and add air pressure, you will hear the air leak into the neighboring cyl. Of course you will also hear if your valves and rings are leaking.

[60man]

Originally Posted by Glenn Sedig

It would be good if you can find your leak down tester. The compression happens so fast when you crank your engine over that it is hard to tell if the gasket is starting to leak. If the gasket is bad and you put the cyl at TDC and add air pressure, you will hear the air leak into the neighboring cyl. Of course you will also hear if your valves and rings are leaking.

Yep..so true Glen.. No argument there..I shot some light oil in 3 last time just to see if it helped...No brainer when the oil popped out of 5 ...Duh..sum biotch..!! I used to be a MATCO distributor so I know all about tools... I have a old Fox Valley engine analizer that does cylinder balance test...we used to call it the scope in a box...might try it just for chits sake..
Oh..comp test didn't show any catastrophic problems..

[65nss4spdGTO]

Originally Posted by Glenn Sedig

Leak down before the inserts were installed, and with 15 runs on the old gaskets, on cyl 3 & 5 was 15%. On cyl 4 & 6 was 8%. The heads were installed with new gaskets. The cylinders heads were flat with no bad areas except between the center cylinders. I got more than 15 runs (more like 30 runs) when the heads were new and no deformation had occurred in the center area.

The inserts where installed to sit .001 above the head surface. The heads have not been surfaced since new. The leak down after the 8 runs - 3 & 5 is 2% 4 & 6 is 3%

Engine is 473 Cu in, 14.5:1 comp. N/A

I need to clarify the engine consitency. Along with the inserts and new head gaskets, I changed my valve lash from .026 cold to .010 cold. Hoped to achieve .018 when hot. I believe the lash change and the fact that the track was prepped before each Q - 8 session also helped with the consitency.

Those leak down numbers are really good, do you normally re-torque the head once it's been on a running engine for a number of heat cycles?

I really believe, due to the nature of this insert material, this will solve many of the head gaskets woes our tied together, Pontiac siamese exhaust engines can have. Once the exhaust temps get so hot, the small amount of mating surface will not cool properly and weakens.

In today's bigger bore engines, our larger bore spaced cousins (BBC) have other issues when the chambers begin to collapse due to the lack of surface real estate.

Increased power will always come with a cost.

Calvin Hill
Hill Performance
708-250-7420

[Glenn Sedig]

Originally Posted by 65nss4spdGTO

Those leak down numbers are really good, do you normally re-torque the head once it's been on a running engine for a number of heat cycles?

Calvin Hill
Hill Performance
708-250-7420

No I do not. I know I should but there is never enough time.

[BruceWilkie]

Originally Posted by Glenn Sedig

No I do not. I know I should but there is never enough time.

related to heat and need to retorque... I've found header bolts (and studded) that need retorque... for awhile... but then just didnt change after a point. I thought rust or corrosion but later tear down every thing is clean and barely rusted on outside...

Causes me to wonder if just pulling to tq spec after a few passes(not loosening and retorquing) you would hit a point eventually where it didnt change. Thoughts???

Maybe kills the studs before the gasket dies ???