What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[pwtr02ss]

I never knew this was one of the Avy's adventures. Cool stuff!

Loooong time ago lol.

 

[gooffeyguy]

Filled up and spent $100 on 25 gallons of 93 octane gas

 

[iamdub]

Filled up and spent $100 on 25 gallons of 93 octane gas

Who had 93 that cheap?

This reminded me of a part of a dream I had last night- I was buy $5.xx/gallon 93 but the total on the pump was a couple thousand. Like, $2,300ish. I'm pretty sure I was filling up the Tahoe, but it would've had to have a 400+ gallon tank.

 

[Tonyrodz]

Who had 93 that cheap?

This reminded me of a part of a dream I had last night- I was buy $5.xx/gallon 93 but the total on the pump was a couple thousand. Like, $2,300ish. I'm pretty sure I was filling up the Tahoe, but it would've had to have a 400+ gallon tank.

Having dreams/nightmares about fueling up?

 

[gooffeyguy]

Who had 93 that cheap?

This reminded me of a part of a dream I had last night- I was buy $5.xx/gallon 93 but the total on the pump was a couple thousand. Like, $2,300ish. I'm pretty sure I was filling up the Tahoe, but it would've had to have a 400+ gallon tank.

The Mobil by my house is $4.14/gallon. I get Exxon/Mobil rewards points and used $3 in rewards. I also have my AARP linked to my Exxon/Mobil account so I get extra rewards points on each purchase. I've saved almost $100 over the past year using rewards points. I'll use either $1, $2, or $3 in rewards each time I get gas.

Current prices near me are in the $3.60 area for regular (87) and $4.04 for premium (93). Mobil is about 10 cents more for each than the QT and Conoco

 

[iamdub]

Having dreams/nightmares about fueling up?

And I don't know why! I'm one of the last to be concerned about fuel prices. I only put in just enough to do whatever short errands I'm running, which is usually 1/4 tank or so. My Tahoe stays parked so much that there's no need to have any more fuel in the tank steadily going stale. I only fill up for road trips. I don't know what that dream was about.

 

[Just Fishing]

Having dreams/nightmares about fueling up?

I am.
I ran the tank pretty much empty before I parked it this time around.
Just in case I got the motivation to do the fuel pump while it's up on jackstands...

I sure wish I filled the tank with premium before parking it right now.


It uses about a 3/4 tank to shuttle me back and forth to the ol property/range.

 

[Just Fishing]

Today is the ol check pushrod length day.

This time around I located my adjustable pushrod and the checker spring.
When I did this last time, I couldn't get them or find the ones I had.

So doing this with the head gasket, and a nice digital caliper that can actually measure the entire pushrod (so much easier).

I'm finding that no matter what, the rocker arms sweep the same... makes sense i suppose right?

So, what I found is the sweep is too far inboard on the valve at the stock ls pedestal height.

But taking a washer that is .060 thick, I get the wipe pattern that i want.

Example,
Swipe with the stand against the head.

Swipe with the stand elevated .060

wtf?!

 

[iamdub]

Today is the ol check pushrod length day.

This time around I located my adjustable pushrod and the checker spring.
When I did this last time, I couldn't get them or find the ones I had.

So doing this with the head gasket, and a nice digital caliper that can actually measure the entire pushrod (so much easier).

I'm finding that no matter what, the rocker arms sweep the same... makes sense i suppose right?

So, what I found is the sweep is too far inboard on the valve at the stock ls pedestal height.

But taking a washer that is .060 thick, I get the wipe pattern that i want.

Example,
Swipe with the stand against the head.
View attachment 367607

Swipe with the stand elevated .060
View attachment 367608

wtf?!

Is it the same for all of 'em?

 

[gooffeyguy]

Today is the ol check pushrod length day.

This time around I located my adjustable pushrod and the checker spring.
When I did this last time, I couldn't get them or find the ones I had.

So doing this with the head gasket, and a nice digital caliper that can actually measure the entire pushrod (so much easier).

I'm finding that no matter what, the rocker arms sweep the same... makes sense i suppose right?

So, what I found is the sweep is too far inboard on the valve at the stock ls pedestal height.

But taking a washer that is .060 thick, I get the wipe pattern that i want.

Example,
Swipe with the stand against the head.
View attachment 367607

Swipe with the stand elevated .060
View attachment 367608

wtf?!

Do you have hydraulic lifters? if so, are they pumped up?

With non-adjustable pedestal style rockers, the adjustment is made with shims or pushrod length

 

[Just Fishing]

Do you have hydraulic lifters? if so, are they pumped up?

With non-adjustable pedestal style rockers, the adjustment is made with shims or pushrod length

They are not pumped up

Odd part is the wipe pattern for my 1.8 full rollers is off unless i shim them

Compcams magnum rockers + AFR mongoose heads

 

[Just Fishing]

This was all noticed because with 7.375 pushrods showed a wipe pattern that was too far inboard.
(right in there with the .050 - .100 ls7 lifter preload)

So i was like fk it, went back to the 7.4's
still good, but under .100 preload

now with the engine torn apart again, i noticed the wipe pattern didn't really change with the longer pushrods.

so here i am, finding the 0 lash so I can figure out preload for the correct pushrods and the sweep never really changes.
it sort of goes closer to the middle by a tiny bit.

I'm sure i'm doing this wrong, but shimming the stand up and it's looking much better.

 

[Just Fishing]

I sent an email to comp cams/Edelbrock for advice.

 

[Just Fishing]

They are being quite helpful.
They said the wipe pattern looks good since it's mostly in the center.
Still odd to me that it's off.

With my sbc in the vette, the rockers are fully adjustable, much easier.

I explained that my main concern , and the reason why I'm detailing this out is the valve train noise at light throttle.

First blamed on the transmission pump or the thrust bearing.

Last run proved it has nothing to do with bearings, and the pump while damaged, was not bad enough to explain the noise...

Next blame in my head would be the double pac springs in the heads.
Or some weird side-effect of the oil pump flooding the heads..

Now i wait... lol

 

[Just Fishing]

Another concern with the wipe pattern would be the valve guides in those expensive fancy heads.

I still might play with shims, but i don't want to run a full .060...

I did find some shims that go between the stand and the rockers.
They are .020 each...

 

[justchecking]

Who had 93 that cheap?

This reminded me of a part of a dream I had last night- I was buy $5.xx/gallon 93 but the total on the pump was a couple thousand. Like, $2,300ish. I'm pretty sure I was filling up the Tahoe, but it would've had to have a 400+ gallon tank.

Sam's and Costco have premium in Dayton now at $3.99 and UDF is at $4.02. Hope it stays that way for my 8MPG trips next two weeks. Pulling camper.

 

[Just Fishing]

Speaking of fuel prices,
I saw a .040 thicknesses head gasket in stock.
That would have brought me down to 10:1

I thought about it for a bit... lol

 

[Doug118]

Had a nice enough day to clean the truck and take some updated pictures

 

[Doubeleive]

decided I am going to try some Raybestos SP1363TRH ceramic pads since many of the premium brand pads are going hybrid which do not seem to last as long

 

[Geotrash]

Took the family and the camper down to Cape Charles, VA this weekend, which requires driving over the 17-mile-long Chesapeake Bay Bridge and Tunnel - a favorite route. Every time we take a trip I am amazed at what capable vehicles these trucks are. I'm also very happy with the Cam Motion Stage 2 truck cam I put in it last year. At one point I had to accelerate hard to get around some cars and make an exit ramp unexpectedly (was forced into the left lane by half a dozen cars that refused to yield getting on the highway) and before I knew it I was doing 95...pulling a 7000 pound camper. The acceleration got my wife's attention and she was amazed as well.

Our friends Heather and Megan have the little "canned ham" Shasta they pull behind their Subaru. This last shot puts things into perspective. Lol.