knock knock where's it at ??? - Team Camaro Tech
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post #1 of 10 (permalink) Old Apr 7th, 04, 02:30 PM Thread Starter
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hey guy's long time no type!!!!!! [img]graemlins/waving.gif[/img]

I have a 87 suburban with a 94 vortec engine.

the engine has a terrible knock,I was hoping it was a bad converter but after unbolting that and still having the knock,I then knew it was a rod...wrong!
I pulled the pan and all the bearings looked great main and rod,I checked all to be sure.

Iam stumped!!!!!

it almost can;t be heard at idel,but just a little gas and it sounds like it's gonna blow.

one thing I though of if the dist was from the orginal 87 motor could there be a problem with the gear...maybe roller cam in the 94 motor I really don;t know.

thanks! for any thoughts though!!!

boy do I mis the 67 [img]graemlins/sad.gif[/img]

Will

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post #2 of 10 (permalink) Old Apr 7th, 04, 02:41 PM
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The mid 90's vortec engines are famous for piston slap. Is the knock really bad or just audible enough to be annoying? I had a '94 Silverado with a 305 that I could hear piston slap in at idle. When cold I often thought there was a serious problem, but the truck is still going strong (in someone elses garage now though).


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post #3 of 10 (permalink) Old Apr 7th, 04, 03:03 PM Thread Starter
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no this is a serious noise. I can't believe the bearing were so good.
this motor is said to only have 35k on it.

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post #4 of 10 (permalink) Old Apr 7th, 04, 03:35 PM
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i would have to agree with choptop,i had the same problem(piston slap)in my 89 pickup.i took the motor apart and found 3 pistons with broken rings.the guy that i bought it from didn't belive in putting oil in it.on mine it sounded like a rod knock but looking at the bearings i could see they were good.does it ge louder as u rev it?


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post #5 of 10 (permalink) Old Apr 7th, 04, 04:16 PM
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Me too, pistons can make a lot of noise...bad noise.

Wristpin(s) is another possibility.

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post #6 of 10 (permalink) Old Apr 7th, 04, 04:24 PM Thread Starter
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way loud when you rev it,kinda sounds like something rapping on an exhaust pipe.
but really can;t pin point to one side or front to back.

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post #7 of 10 (permalink) Old Apr 8th, 04, 09:31 AM
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a 94 isn't a Vortec- it's just a one piece rear main seal 350 TBI engine with a flat tappet cam in it instead of a roller.
my cousin has a 94 Suburban with a 350, and it make a bit of a racket like a bad rod knock at startup for a few seconds, then quiets right down.

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you have to make it up on the spot.

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post #8 of 10 (permalink) Old Apr 9th, 04, 03:10 AM Thread Starter
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I though all were vortec when they became F/I'd.

if it a stardard short block then the 350 from that 84 pick-up will go in with just a intake swap right?

thanks!
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post #9 of 10 (permalink) Old Apr 9th, 04, 11:12 PM
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there are differences from the older small blocks to the newer ones- the most notable two are the one piece rear seal and the angle of the 2 middle intake bolts on each side. so, with a flexplate that matches the year of the engine, and a little die grinder work on the 2 middle intake bolt holes in the TBI intake, it should be a fairly direct swap. of course, then you have to deal with the TBI computer maybe not liking the older engine...

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post #10 of 10 (permalink) Old Apr 10th, 04, 01:50 AM Thread Starter
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sshhhheeessss...........anybody want to buy a 3/4 ton suburban [img]graemlins/sad.gif[/img]

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