bb crank P/N
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
bb crank P/N
Hello
My 68 BB got rebuild about 14 Years ago and has since than only done about 15.000 Miles.
The block was bored .030 over and a complete guts kit ( krank, rods, pistons ) got installed from TRW.
Forget 11.5 compression pistons, rods ?? and cast crank.
The kit was purchased without any extra balancing surplus.
I like to get all balanced and since I have to remove all, I like to change the crank against a forged one.
In E-bay, they offer a GM forged, nitrited crank , P/N 3856223, stroke 3.76.
Is this the original 427/435 HP L71/L89/L88 crank ?
They ask 240 $ for a new crank , is that OK.
Is this crank the crossdrilled one ?
What exactly do I need to remove for balancing ? Crank, rods, pistons and ???
I like to rev this engine to 6.500 , will the rods be OK from this kit ?
It was a L71 engine, but the previous owner rebuild the motor due to a twisted crank. He just bought the complete kit and threw all original stuff away, including the rods and pistons.
Thanks. Gunther
My 68 BB got rebuild about 14 Years ago and has since than only done about 15.000 Miles.
The block was bored .030 over and a complete guts kit ( krank, rods, pistons ) got installed from TRW.
Forget 11.5 compression pistons, rods ?? and cast crank.
The kit was purchased without any extra balancing surplus.
I like to get all balanced and since I have to remove all, I like to change the crank against a forged one.
In E-bay, they offer a GM forged, nitrited crank , P/N 3856223, stroke 3.76.
Is this the original 427/435 HP L71/L89/L88 crank ?
They ask 240 $ for a new crank , is that OK.
Is this crank the crossdrilled one ?
What exactly do I need to remove for balancing ? Crank, rods, pistons and ???
I like to rev this engine to 6.500 , will the rods be OK from this kit ?
It was a L71 engine, but the previous owner rebuild the motor due to a twisted crank. He just bought the complete kit and threw all original stuff away, including the rods and pistons.
Thanks. Gunther
Burning Brakes
Joined: Aug 2004
Posts: 856
Likes: 2
From: Tyler Texas
Gunther: That part number does not show up in my GM Chev. Corvette Parts Catalog. Group O.646 contains all the Corvette crankshafts.
The 427 crankshafts--depending on which engine--are listed as follows:
3882842, for year 66-69, special H.Perf 427
3882849, for year 1969, except Al. cyl and case special H. Perf
3967811, for years 68-69, with H.D.427
3879621m for 1967, with H.D. 427
The 427 crankshafts--depending on which engine--are listed as follows:
3882842, for year 66-69, special H.Perf 427
3882849, for year 1969, except Al. cyl and case special H. Perf
3967811, for years 68-69, with H.D.427
3879621m for 1967, with H.D. 427
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Originally Posted by Brettmc
Aren't those the truck cranks that weigh a ton??
Brett
Brett
Brett, why should they be more heavy ? The counterweights should only counterweigh rods n pistons ?
OK, truck pistons are slightly heavier due to the 3rd ring setup, but is this a lot ?
Rgds. Gunther
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi again.
So, which still available forged steel hi-perf crossdrilled crankshaft is still available on today's market ?
Who offers something that is Vette specific ?
Thanks. Gunther
So, which still available forged steel hi-perf crossdrilled crankshaft is still available on today's market ?
Who offers something that is Vette specific ?
Thanks. Gunther
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Originally Posted by WESCH
Hi again.
So, which still available forged steel hi-perf crossdrilled crankshaft is still available on today's market ?
Who offers something that is Vette specific ?
Thanks. Gunther
So, which still available forged steel hi-perf crossdrilled crankshaft is still available on today's market ?
Who offers something that is Vette specific ?
Thanks. Gunther
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
OK, any suggestions about a good high torque hi performance steel crank for my 427 CI. Like I mentioned, I like to go to 6500 RPM max.
May be SUMMIT or ???
Rgds. Gunther
OK, any suggestions about a good high torque hi performance steel crank for my 427 CI. Like I mentioned, I like to go to 6500 RPM max.
May be SUMMIT or ???
Rgds. Gunther
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Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
OK , here an advertisement :
These are right from GM, these have the GM part #3856223 right on the crank,
And I found this casting 6223 existing in the " How to rebuild BIG-BLOCK CHEVY ENGINES " book from Tom Wilson.
His listing is for 366 , 396 & 427 Engines.
So, it is a GM crank for only 240 US$, but is it useable in a short block Vette engine ?
It is suppost to be nitrided ( normally only done to high performance cranks ), but don't know if it's crossdrilled ?
Rgds. Gunther
OK , here an advertisement :
These are right from GM, these have the GM part #3856223 right on the crank,
And I found this casting 6223 existing in the " How to rebuild BIG-BLOCK CHEVY ENGINES " book from Tom Wilson.
His listing is for 366 , 396 & 427 Engines.
So, it is a GM crank for only 240 US$, but is it useable in a short block Vette engine ?
It is suppost to be nitrided ( normally only done to high performance cranks ), but don't know if it's crossdrilled ?
Rgds. Gunther
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Hi
Yes, I also got a bit more info.
This crank was for example used in a 400 Chevelle 300 HP setup.
Now I know that 300 HP are not 435 HP used on Vettes, but this crank is also nitrited and crossdrilled, so ????
Damn, I don't know anything about cranks !!
Rgds. Gunther
Yes, I also got a bit more info.
This crank was for example used in a 400 Chevelle 300 HP setup.
Now I know that 300 HP are not 435 HP used on Vettes, but this crank is also nitrited and crossdrilled, so ????
Damn, I don't know anything about cranks !!
Rgds. Gunther
