bad vibration

[philo_beddoe]

Ok i'll ask,,,whats a cylinder power balance test?

Vile, your pretty savy with these trucks, but i think this one might even stump you.  (Or maybe im just using reverse psychology to get you to invite me over to fix this cursed problem).

[philo_beddoe]

I'm gonna try to reread this whole thing and put my thinking cap on. I wish I could come over and look at it.

Capt. Swampy..I would LOVE for you and any of the "usual suspects" on this forum to take a crack at this. If i were wealthy, i would fly some of you out here and we would have a 77 Chevy diagnostics party.

I would pay the first guy who nailed this thing a thick stack of cash!!

If it aint the balancer then its got to be some thing internal, and im not paying much more than 200 bucks to end this madness.

I'll let the block crack itself open and burn first. Then get a new 350 crate engine!

I am honstly getting steamed as i type this.

[Rattler12]

Have you ruled out the water pump?

[philo_beddoe]

Water pump? Doh!!!  Not entirely, but it's quiet and my temp is good, and the pulley on it looks straight and tight.

Actually now that i remember, i did unhook all belts and ran engine, still shudders/vibrates.

[philo_beddoe]

The mechanic didnt come up with much, except that it looks like i have a 350 and not a 305, and that i need to match up the right harmonic balancer with the right flexplate. I have a 383 stamped on my block, what does that mean?

Anyway,,,,so why didnt it shudder before?!!! I never noticed it before!!!! I'm not convinced.

I cant believe i have to drive around with this problem until i can save up enough for a new crate engine. I never thought it would come to this.

[zieg85]

Behind the alternator there is a series of numbers stamped on the block.  Lets start there by determining what you have

[philo_beddoe]

Ok, i will check and post asap.  I also need encouragement, at the end of my rope!

[zieg85]

We'll all try to help.  I can tell you a story but would only be a downer so I will keep it to myself...

Was the engine ever ran with the torque converter disconnected?

[philo_beddoe]

Here it is! What do you make of it??

[philo_beddoe]

I dont believe it was ran with the t converter disconnected.

[zieg85]

DNL is a 1979 305... Looks like your mechanic may not know everything so you have a prayer

[zieg85]

Look carefully at the smaller #'s.  They should contain the last numbers of the trucks VIN if it is original to the truck

[zieg85]

http://www.nastyz28.com/gm-chevy-codes/chevy-engine-codes-suffix-4.php

is where I got the block info from

[philo_beddoe]

I cant match this up with anything!

[philo_beddoe]

Ok, hang on.