Engine Knock
09-01-2009, 12:03 PM
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Car: 86 IROC
Engine: 350 Vortec TPI
Transmission: 700R4
Axle/Gears: BW 3.27
Engine Knock
Hey guys quick question. I jsut recently built a vortec 350 tpi and I have an engine knock. it only does it when the car is cold or has been sitting for a while. The block is out of a 98 chevy 2500 pickup. I did a search and it looks like this is a common thing for those blocks. anyone have any qxperience with this? also could it be a dead lifter waiting for oil pessure?
09-01-2009, 01:17 PM
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Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
Re: Engine Knock
It is really hard to say without us being there.
Maybe with a video we can see what you mean.
Did you check the rod and main bearing clearances when you assembled the motor? Were they within spec?
Maybe with a video we can see what you mean.
Did you check the rod and main bearing clearances when you assembled the motor? Were they within spec?
09-01-2009, 01:36 PM
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Car: 86 IROC
Engine: 350 Vortec TPI
Transmission: 700R4
Axle/Gears: BW 3.27
Re: Engine Knock
Everything was within tolerance. It does not sound like it is deep in the motor. It almost sounds like piston slap or a dead lifter as if there is no oil getting to a lifter, or very little. I did a search on the net and the L31 blocks have issues with excessive piston slap when the motor is cold. Not sure how true that is or if I got a dud of a motor. The weirdest thing is that the motor runs great and the noise goes away after a minute or two when the motor warms up.
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