Which ever one stays in my garage is going in my Blazer....!
CK5
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454 Suburban Motor cam drive let go. Updated; With Carnage pics!!
- Thread starter KeyBlazer
- Start date
Stripped the Motor today to see how bad it was....
Enjoy the Carnage!
Yes, for those that told me that its NOT an "Interference Motor".
Here is what greeted me when I pulled the inlet manifold!
Drivers side Bank.
Drivers side head... some of the the inlet valves are just bent enough to hold the off the seat.
The Passenger side head was much worse.. Inlet Valves are very bent! Stranger was that there was water in #1 cylinder and you can see the rust ... this motor was not left outside and was sealed... I wonder if it cracked the head?
Enjoy the Carnage!
Yes, for those that told me that its NOT an "Interference Motor".
Here is what greeted me when I pulled the inlet manifold!
Drivers side Bank.
Drivers side head... some of the the inlet valves are just bent enough to hold the off the seat.
The Passenger side head was much worse.. Inlet Valves are very bent! Stranger was that there was water in #1 cylinder and you can see the rust ... this motor was not left outside and was sealed... I wonder if it cracked the head?
thats nice lookin insides for that much milage.
those look like peanut port heads to me. i would trash them or sell them for cores. go get some new bolt on heads or 049 / 781 casting heads from a older stock pre emmisions 454.
those look like peanut port heads to me. i would trash them or sell them for cores. go get some new bolt on heads or 049 / 781 casting heads from a older stock pre emmisions 454.
Yes, I thought so too... I am a stickler for changing the oil about every 3k.
I pulled the whole thing apart this afternoon... bores look nearly perfect!
No ridges or scoring.
Pistons look good too, but on #2 piston that had seen some water, the rings where stuck in the groves and gummed up.
Looks like this motor is destined for my blazer!
At least it only bent half of them.
Not bad though for that high mileage.
Not bad though for that high mileage.You gotta smile at the neat little telltale makes on the valves where they kissed the pistons....
Oh, I know its a silly question, but all of the pistons have a neat little "Dent" in them.... Was there one there all along or did the the contact do it?
Oh, here is a pic...
Oh, I know its a silly question, but all of the pistons have a neat little "Dent" in them.... Was there one there all along or did the the contact do it?
Oh, here is a pic...
jhellwig
1/2 ton status
It looks like the dents were caused but the valves. When the chain went it probably just didn't completely let go. It probably jumped and then caught again causing all the cylinders to be damaged. It looks like you are very lucky to get by with pistons and a rebuild on the heads.
yes they where like that to begin with called valve reliefs, my 88 3500 chain let go no valve bending replaced the chain and put 35 ,000 mor miles on here,also a 86 bronco 5.0 striped out same way, replaced and still going 50,000 ago 180,000 total. both where at low speed or almost idle.
depeds on the compression ratio those pistons you have look higher compression than mine where mine had 2 reliefs on them.
depeds on the compression ratio those pistons you have look higher compression than mine where mine had 2 reliefs on them.
i just seen you where in irvine i just had my bigblock built for my sub at a place in Santa ana 1 week turn around and great price 1yr warranty very happy and buit to suite you're needs. pm me if you want more details
Thunder
3/4 ton status
As said above those dents are valve reliefs. They are susposed to be there.
You have a low compression engine. The high compression 454 have 2 reliefs and flat top.
Dont feel bad. I am doing the same thing on a DOHC 5 valve per hole head. It lost the timing belt. Bent the valves. Bottom end is Ok.
But
1 Rebuilt head is costing me 800.Plus anopther 300 or so in parts. When it is all said and done I will have more $$$ into that little 4 banger head than it takes to build a 454.
You have a low compression engine. The high compression 454 have 2 reliefs and flat top.
Dont feel bad. I am doing the same thing on a DOHC 5 valve per hole head. It lost the timing belt. Bent the valves. Bottom end is Ok.
But
1 Rebuilt head is costing me 800.Plus anopther 300 or so in parts. When it is all said and done I will have more $$$ into that little 4 banger head than it takes to build a 454.
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Well...
The 1990 bottome end is worse than what I took out!
There are deep scores on the crank journals.
Here is a pic..
So, I am gonna mic up my original crank and see how it looks.
The 1990 bottome end is worse than what I took out!
There are deep scores on the crank journals.
Here is a pic..
So, I am gonna mic up my original crank and see how it looks.
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As the 1990 Motor does not look so good, I began to look at the crank from my 87 as a base....
I did notice that when I took the crank out there was a lot of play on the thrust washers..
I can see why now...
Look at this!
The rear thrust face on the crank is worn to a knife edge!
And here you can see how much slop there was between the Thrust bearing and the crank.. I would guess its 1/8"!
Oh, quick question for you engine guys...
I Ran a Micrometer on the crank journals..
My Mic is in inches and I am unsure how to read it.. I am a MM based guy..
Ok, the mains and rod journals read between 1/25th undersize ... in other words the Rods read 1/25 under 2.2" and the Mains read about the same under 2.75"...
I seem to remember that this means that the manins are 2.749" and the rods are 2.199... Am I right?
Can someone put this straight in my head?
Cos I think that means that the crank jounals are good... for what thats worth!
I did notice that when I took the crank out there was a lot of play on the thrust washers..
I can see why now...
Look at this!
The rear thrust face on the crank is worn to a knife edge!
And here you can see how much slop there was between the Thrust bearing and the crank.. I would guess its 1/8"!
Oh, quick question for you engine guys...
I Ran a Micrometer on the crank journals..
My Mic is in inches and I am unsure how to read it.. I am a MM based guy..
Ok, the mains and rod journals read between 1/25th undersize ... in other words the Rods read 1/25 under 2.2" and the Mains read about the same under 2.75"...
I seem to remember that this means that the manins are 2.749" and the rods are 2.199... Am I right?
Can someone put this straight in my head?
Cos I think that means that the crank jounals are good... for what thats worth!
If the crank needs a bunch of machining to correct it, you might be better off just buying a stroker kit.
496 Stroker cranks are usually price-competitive with either a new 454 crank, or the machine work to repair a badly damaged one.
You might not want to deal with the smog / fuel injection issues of building a larger motor, but I thought I'd at least remind you that you've got it as an option.
496 Stroker cranks are usually price-competitive with either a new 454 crank, or the machine work to repair a badly damaged one.
You might not want to deal with the smog / fuel injection issues of building a larger motor, but I thought I'd at least remind you that you've got it as an option.
CHEVY BIG BLOCK V-8 Crankshaft Journal Sizes
ALL Chevy big blocks used...Mains-2.7488"-2.7495"---Rods-2.20"
ALL Chevy big blocks used...Mains-2.7488"-2.7495"---Rods-2.20"
reddog64
1/2 ton status
I had a BBC 468 that the crank looked like that...
We were doign a cam swap and the crank 'moved' the wrong direction.... (in and out) almost a 1/4 inch...
Same problem.. thrust was toast...
We were doign a cam swap and the crank 'moved' the wrong direction.... (in and out) almost a 1/4 inch...
Same problem.. thrust was toast...
