What a week! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

padreisla · 09-27-2003, 10:21 PM

I took off 3 business days this week to work on the truck and go to BikeFest here in Tampa. Spend the first 2 days getting parts to do the work this weekend. Finally got the truck out of the shop late on Friday after having a new Intake, carb, transmission, valve covers and alternator bracket installed. I drove it around the block and headed to the house to take the old transmission and old tires out of the bed and threw my back out. Rested for a little while and headed down to the yard to look for bucket seats when I heard a low sounding knocking coming from the engine. The next thing I know it is getting loud real quick and the engine shuts down. Stuck on the interstate in the middle of nowhere, I let it sit for a little while and then started it back up and went home at 10 mph. I think I lost a camshaft or main bearing. Man that is the pits, more money to spend. Do any of you have any ideas how much work is going to be involved in this one? The oil looks Ok and is not low, the engine did not get hot, I started to hear a high pitch knock toward the end. It is a 402BB which was rebuilt 4000 miles ago and was balanced and blue printed. Should I just do the lower side or get a short block and go from there? I am your true back-yard mechanic.

*Randy70C-10* · 09-27-2003, 11:20 PM

You should take it back to the shop that built it and have them look at it.

padreisla · 09-28-2003, 01:53 AM

I would take it back, but I bought it from my brother in Texas, who bought it from a mechanic a couple of years ago who has since passed away. My brother was a good friend of the mechanic and is familiar with the truck. The shop that did the work this past week, only did the top end. I would rather take it to a rebuild shop and have them look it over, I am just not sure what all is needed.

Thanks....Joey

*dtlilly* · 09-28-2003, 03:32 AM

I would strip it down, then take the short block to a rebuild shop.

Class of 69 · 09-28-2003, 10:06 PM

Could be either a rod or main bearing. If it spun a rod, that would require a different crank. If it spun a main...kiss the block good bye. Sorry...either way is going to hurt the wallet pretty bad.

72shadetree · 09-28-2003, 10:20 PM

sorry to hear that.has anybody ever heard that on the 396/402 that under hard take offs that the oil pan is not big enough and it will pull all the oil to top of motor and starve the bottom end.i have heard this recently by 3 reliable builders also will a bigger pan fit our trucks

*dtlilly* · 09-29-2003, 01:54 AM

I've heard of a baffle in the oil pan to prevent/slow-down such a problem.

72shadetree · 09-29-2003, 10:55 PM

thanks

BLACK AND BLUE 67-72 · 09-29-2003, 11:10 PM

Take it and have them look at it, sounds like a bearing or something like that.

Spoof · 09-29-2003, 11:32 PM

I've heard big block oil slurping stories too but I can't say I've heard of any more bottom end problems in the 402s than in small blocks, so I question it but i'm not saying it aint so.

dinnut · 09-29-2003, 11:46 PM

i might be getting a 402 swb project truck so i might be interested inthis.

09-27-2003, 10:21 PM	#1
padreisla Registered User Join Date: Jan 2003 Location: Tampa, Florida Posts: 141	What a week! I took off 3 business days this week to work on the truck and go to BikeFest here in Tampa. Spend the first 2 days getting parts to do the work this weekend. Finally got the truck out of the shop late on Friday after having a new Intake, carb, transmission, valve covers and alternator bracket installed. I drove it around the block and headed to the house to take the old transmission and old tires out of the bed and threw my back out. Rested for a little while and headed down to the yard to look for bucket seats when I heard a low sounding knocking coming from the engine. The next thing I know it is getting loud real quick and the engine shuts down. Stuck on the interstate in the middle of nowhere, I let it sit for a little while and then started it back up and went home at 10 mph. I think I lost a camshaft or main bearing. Man that is the pits, more money to spend. Do any of you have any ideas how much work is going to be involved in this one? The oil looks Ok and is not low, the engine did not get hot, I started to hear a high pitch knock toward the end. It is a 402BB which was rebuilt 4000 miles ago and was balanced and blue printed. Should I just do the lower side or get a short block and go from there? I am your true back-yard mechanic. __________________ 67 C20 LWB 454 BB THD 400 97 Jeep Wrangler 4cyl 5sp

09-28-2003, 01:53 AM	#3
padreisla Registered User Join Date: Jan 2003 Location: Tampa, Florida Posts: 141	What a week I would take it back, but I bought it from my brother in Texas, who bought it from a mechanic a couple of years ago who has since passed away. My brother was a good friend of the mechanic and is familiar with the truck. The shop that did the work this past week, only did the top end. I would rather take it to a rebuild shop and have them look it over, I am just not sure what all is needed. Thanks....Joey __________________ 67 C20 LWB 454 BB THD 400 97 Jeep Wrangler 4cyl 5sp

09-28-2003, 10:06 PM	#5
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	Could be either a rod or main bearing. If it spun a rod, that would require a different crank. If it spun a main...kiss the block good bye. Sorry...either way is going to hurt the wallet pretty bad. __________________ 69 GMC K10 ..some restoration required....still..

09-28-2003, 10:20 PM	#6
72shadetree KEEP ON TRUCKING Join Date: Sep 2000 Location: martinsville va Posts: 2,563	sorry to hear that.has anybody ever heard that on the 396/402 that under hard take offs that the oil pan is not big enough and it will pull all the oil to top of motor and starve the bottom end.i have heard this recently by 3 reliable builders also will a bigger pan fit our trucks __________________ 72 cheyenne 2wd lwb 71 k20 sons bassett va

09-29-2003, 10:55 PM	#8
72shadetree KEEP ON TRUCKING Join Date: Sep 2000 Location: martinsville va Posts: 2,563	thanks __________________ 72 cheyenne 2wd lwb 71 k20 sons bassett va

09-27-2003, 11:20 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	You should take it back to the shop that built it and have them look at it.

09-28-2003, 03:32 AM	#4
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	I would strip it down, then take the short block to a rebuild shop.

09-29-2003, 01:54 AM	#7
dtlilly Account Suspended Join Date: Jan 2003 Location: Shadow of Lambeau Field Posts: 5,597	I've heard of a baffle in the oil pan to prevent/slow-down such a problem.

09-29-2003, 11:10 PM	#9
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Take it and have them look at it, sounds like a bearing or something like that. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA Last edited by BLACK AND BLUE 67-72; 09-29-2003 at 11:12 PM.

09-29-2003, 11:32 PM	#10
Spoof Registered User Join Date: Jul 2000 Location: Victoria,BC, Canada Posts: 1,300	I've heard big block oil slurping stories too but I can't say I've heard of any more bottom end problems in the 402s than in small blocks, so I question it but i'm not saying it aint so. __________________ 71 GMC 1500 LWB

09-29-2003, 11:46 PM	#11
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	i might be getting a 402 swb project truck so i might be interested inthis. __________________ 70 longbed 496/th400/Ford 9"



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