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Author Topic: Does this gunk mean I have an internal engine coolant leak?  (Read 609 times)
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Tronman
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Any car gets great mileage when you ride your bike


« Reply #15 on: April 13, 2018, 09:49:27 PM »

Here is one of  the culprits which began this whole valvetrain replacement adventure..  NAPA doesn't catalog the original rocker arms for this vehicle, although they do have the pushrods.  My machinist found a source for them..  most of $400 for twelve rocker arms..  

[Edit to include a picture of old and new rockers side by side.]
« Last Edit: April 13, 2018, 10:31:27 PM by Tronman » Logged
Tronman
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Any car gets great mileage when you ride your bike


« Reply #16 on: April 13, 2018, 09:58:09 PM »

So I decided to go the aftermarket route and get some Comp Cams roller rockers, about $248 for all twelve.  These are the catalog listed rockers for this engine.  The ratio looks right at 1.6:1, however there are other problems.  The roller tip is a little bit higher than the stock rubbing block, so the pushrods become too short!

Also, I'm pretty sure these are meant for a studded head application, because they come with bolts which you could adjust and then tighten an allen head inner lock bolt.

Well, the diameter looks close on the roller shaft versus the OEM ones, but..  nope.  It's bigger.  I got out my micrometer and measured the difference.  Also, the factory pedestals would hit the aftermarket rollers before rocking back and forth enough to open and close the valves.  I could enlarge the diameter of the circular portion of the factory pedestals, which would then lower the rockers.

Oh, and one other thing..  the new rockers have this lip which protrudes below the roller rocker, and it's bigger than the difference between the valve head height over the keepers.  So I'd have to take some of that lip off too.  That'd be the easy part of this operation..

This is turning into quite the old school back yard hot rod project here!
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Tronman
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Any car gets great mileage when you ride your bike


« Reply #17 on: April 17, 2018, 05:38:25 PM »

Well crap.  It turns out that the old number of 12576628 that I'd gotten from several sources for this rocker arm is an invalid number now from GM, and is no longer in their system.  I finally called the dealer and they have, for $38 apiece, in two different out of state warehouses, all twelve of PN 19333180.  That's the good word on the actual rocker arms for  this engine.

I'm having my local (independently owned, not a Corporate store) NAPA cross this number and find something more reasonable in price.

I sent the Magnums back, as I don't have the time to fabricate stuff right now (maybe later, when it's not such a time crunch situation..) and Jeeezus this has been a headache!!
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Tronman
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Any car gets great mileage when you ride your bike


« Reply #18 on: Yesterday at 06:56:15 PM »

After an arduous search I finally found the twelve rocker arms and pushrods..  that set me back an extra $497!!

After fussing and working and solving a thousand little puzzles and using every torque wrench I own, I finally got it together and..

IT PURRS LIKE A KITTEN!!!

I've so missed my car!!

I couldn't remember how one of the firewall (right side of engine) spark plug wire holders bolts down, so it's just sort of dangling, which I know is incorrect..  but I haven't yet found the right diagram for it.  Meanwhile however, it sounds fan frickin' tastic and as soon as I get the muffler for it tomorrow, I'll be able to verify that it no longer does the power fade thing at 40 percent of calculated load..  Hey, I know for damn sure there aren't any vacuum leaks or a bad EGR valve now!!
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