Why is this plumbed this way?
01-08-2025 | 07:42 PM
#11
Registered
Joined: Jan 2005
Posts: 4,822
Likes: 376
From: IL
I don’t know that it was the head gasket? Do you see something?
On the forensic examination the raw water pump plastic body had a section missing so I think it overheated. Both banks had the same water in them so I don’t think it was an exhaust manifold because I don’t think 2 would fail at one time. I think water got sucked back into the engine from the exhaust. Flappers not working.
On the forensic examination the raw water pump plastic body had a section missing so I think it overheated. Both banks had the same water in them so I don’t think it was an exhaust manifold because I don’t think 2 would fail at one time. I think water got sucked back into the engine from the exhaust. Flappers not working.
not saying this is your problem, but it is a problem
01-09-2025 | 02:14 AM
#13
Registered
Joined: Nov 2004
Posts: 14,100
Likes: 3,687
From: On A Dirt Floor
To answer the opening question, click here:
https://www.cpperformance.com/p-7395...for-chevy.aspx
and after reading that, click on the installation instructions on that page.
And there you have it.
https://www.cpperformance.com/p-7395...for-chevy.aspx
and after reading that, click on the installation instructions on that page.
And there you have it.
01-09-2025 | 04:47 AM
#14
Thread Starter
Registered
Joined: Oct 2002
Posts: 2,055
Likes: 91
From: Bowling Green, Kentucky
Thanks for the replies, Good find SB makes sense now. Yes didn't even really notice the head gasket not lining up with that water port.
It is a different build. It has 990 GM heads, flat tappet hydraulic cam, 445 block, almost like old school LS7. The numbers on the block say that it could be either 2 or 4 bold main. It has pistons with big domes. I still dont have it pulled because my little tractor won't quite lift over the transom.
I cleaned the cylinders up a bit and surpisingly they look good. I thought for sure it would be trash. I plan to pull the rest and check out what I've got on the bottom end and go from there. I may rebuild a 496 or start from new. The bore is crudely measured at 4.250 with calipers,
It is a different build. It has 990 GM heads, flat tappet hydraulic cam, 445 block, almost like old school LS7. The numbers on the block say that it could be either 2 or 4 bold main. It has pistons with big domes. I still dont have it pulled because my little tractor won't quite lift over the transom.
I cleaned the cylinders up a bit and surpisingly they look good. I thought for sure it would be trash. I plan to pull the rest and check out what I've got on the bottom end and go from there. I may rebuild a 496 or start from new. The bore is crudely measured at 4.250 with calipers,
01-11-2025 | 03:34 PM
#15
Thread Starter
Registered
Joined: Oct 2002
Posts: 2,055
Likes: 91
From: Bowling Green, Kentucky
Got it all disassembled and ready to go to a machine shop. I am going to do a 496 rotating assembly. I haven’t decided whether to use the 990 heads or go with some aluminum ones. I’m going to go to a roller cam though for sure.
