I broke'did my toy... Kenne Bell/370 rebuild
10-05-2013, 09:12 AM
#1
I broke'did my toy... Kenne Bell/370 rebuild
At LS Fest back in September, I developed a knock after a pull where I let out due to some noise I though was detonation. Upon inspection, I found #2 plug's ground strap a little melted and lots of metal in the oil and filter. Being that the metal flakes were both steel and aluminum, discussion with the guys at SAM thinking I may have had the King tri-metal main bearings on one/some were spun even though my oil pressure hadn't changed. I get the truck home, start tearing it down and this is what I find...
Odd bank (7,5,3,1)
Even bank (2,4,6,8)
Bad 1&2
#2 bottom
#1 bottom
#1 top
#2 top
Odd bank (7,5,3,1)
Even bank (2,4,6,8)
Bad 1&2
#2 bottom
#1 bottom
#1 top
#2 top
10-05-2013, 09:23 AM
#2
Now on to the cylinders....
#1
#2
Most of the marks are material transfer from the pistons and they cylinders don't seem to be scored. I picked up some muratic acid I am going to use to get the aluminum off without abrasives to get a better idea of what shape the cylinders are actually in.
#1
#2
Most of the marks are material transfer from the pistons and they cylinders don't seem to be scored. I picked up some muratic acid I am going to use to get the aluminum off without abrasives to get a better idea of what shape the cylinders are actually in.
10-05-2013, 03:08 PM
#6
It could be a combination of things. Looking at the scuffing on 3-8, it could have been a really close bore clearance. Combine that with the way the KB manifold feeds directly over 1&2, running a heat range too hot plug (BR6EF), a set of hand ported heads which may be inconsistent between runners and spraying it with a 50 shot on that last pass probably all contributed to the perfect piston swelling storm that allow the pistons to make contact with the wall.
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10-05-2013, 03:57 PM
#9
I got the crank out and the bores cleaned up today.
Main bearings have some wear. I believe the pitting in #1 is from the piston debris in the oil.
Crank looks ok to me. I cannot feel anything with my nail on #1.
Block side bearings. I didn't get a pic but the thrust bearing had hardly any wear.
#2 top side after cleaning
#1 bottom side before cleaning
#1 bottom after cleaning
#2 bottom before
#2 bottom after
#1 top before
#1 top after.
I can feel a little texture in #2 bottom and #1 top sides. I think it may be a little more than just a hone can get. Hopefully I can get it with a .005 overbore as Wiseco has an off the shelf 4.035 bore -11cc piston. Regardless, it needs to go to the machine shop.
Main bearings have some wear. I believe the pitting in #1 is from the piston debris in the oil.
Crank looks ok to me. I cannot feel anything with my nail on #1.
Block side bearings. I didn't get a pic but the thrust bearing had hardly any wear.
#2 top side after cleaning
#1 bottom side before cleaning
#1 bottom after cleaning
#2 bottom before
#2 bottom after
#1 top before
#1 top after.
I can feel a little texture in #2 bottom and #1 top sides. I think it may be a little more than just a hone can get. Hopefully I can get it with a .005 overbore as Wiseco has an off the shelf 4.035 bore -11cc piston. Regardless, it needs to go to the machine shop.
Last edited by BigKID; 10-05-2013 at 05:53 PM.
10-05-2013, 04:41 PM
#10
That sucks man , so crank and cam are ok ?
I just don't trust anyone other than GM built long blocks , too many I've seen have problems. I'd just find a stock long block and go have fun again for not much money . I'm not saying there aren't good shops that can build them though.
I just don't trust anyone other than GM built long blocks , too many I've seen have problems. I'd just find a stock long block and go have fun again for not much money . I'm not saying there aren't good shops that can build them though.