info on a 427!
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Joined: Mar 2004
Posts: 67
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From: secane pa
info on a 427!
I have a 2001 coupe, if I wanted to upgrade the engine to a 427 is any parts from the stock ls1 compatable with the 427block ( other than the power steering , etc.) is it woth it . looking for more power but maintain reliability? please any info will help. thanks!! :cheers:
Team Owner
Joined: Apr 2001
Posts: 36,453
Likes: 2
From: Overwhelmed as one would be, placed in my position.... DFW, TX
St. Jude Donor '05
Re: info on a 427! (jimmagrdII)
I'm guessing the only thing that can be reused is the ignition system and the intake manifold (if an LS6)... I suppose you could reuse the stock exhaust manifolds, but.... :leaving:
Safety Car
Joined: Sep 2002
Posts: 3,948
Likes: 0
From: Aurora IL
St. Jude Donor '06
Re: info on a 427! (jimmagrdII)
Boy to be able to start over again. I would look at this for starters. Good Luck :cheers:
http://www.ls1speed.com/engine1.cfm
http://www.ls1speed.com/engine1.cfm
Melting Slicks
Joined: Sep 2003
Posts: 2,458
Likes: 105
From: Northville Michigan
Re: info on a 427! (Z06GMAN)
Gary,
I would be worried about whoever put that add together.
The stock LS1-LS6 engine uses rods with a center to center distance of 6.104".
The stroke of the advertised 427 is 4.000".
Therefore, the center to center distance of the new rods should be 0.378" shorter than the standard rod - 5.726".
Instead, they advertise a rod with a center to center distance of 6.125". Thats a difference of 0.399" . With that rod length, either the pin is moved up so high that you won't have room for rings, or the piston will extend about the block's deck.
:nono: :confused:
[Modified by Pumba, 6:25 PM 3/14/2004]
I would be worried about whoever put that add together.
The stock LS1-LS6 engine uses rods with a center to center distance of 6.104".
The stroke of the advertised 427 is 4.000".
Therefore, the center to center distance of the new rods should be 0.378" shorter than the standard rod - 5.726".
Instead, they advertise a rod with a center to center distance of 6.125". Thats a difference of 0.399" . With that rod length, either the pin is moved up so high that you won't have room for rings, or the piston will extend about the block's deck.
:nono: :confused:
[Modified by Pumba, 6:25 PM 3/14/2004]
Le Mans Master
Joined: Mar 2002
Posts: 5,718
Likes: 2
From: Flower Mound TX
Cruise-In V Veteran
St. Jude Contributor
Re: info on a 427! (Z06GMAN)
Similar to LPE's Darton sleeve 427 package. That is my dream for next year. No FI, just more cubes, HP, and Torque :smash:
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
Re: info on a 427! (jimmagrdII)
By 427 block, I take it to mean the C5R block which is about $6400 for the bare block. This is overkill unless you are going to put a Supercharger on it. For N/A applications, you could use the LS1/LS6 Darton block resleeved to a 4.125 bore. At a minimum, you would also need 4.125 bore pistons, 6.125 length rods and a 4.000 stroke crank, and bigger injectors. Everything else on your 2001 can be pressed into service, if need be. It boils down to how much you want to spend and what you want to end up with.
By the way, longer rods are preferred over shorter ones because it reduces the maximum angle of the rod to the crank among other things, which makes for more clearance. There are plenty of off the shelf pistons that will work for the longer rod.
By the way, longer rods are preferred over shorter ones because it reduces the maximum angle of the rod to the crank among other things, which makes for more clearance. There are plenty of off the shelf pistons that will work for the longer rod.
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
Re: info on a 427! (jimmagrdII)
The only thing left in my car from the original LS1 setup is the alternator and power steering pump.. A 427 is a complete upgrade from the 346 LS1 motor.....just trade your motor in as a core and go from there. The heads from your stock motor will not work.....they are chambered for a 3.898" bore, not a 4.125". You need Stage III heads that unshroud the valves and match the 4.125" bore. :cheers:
[Modified by HIGHRPM, 5:28 PM 3/14/2004]
[Modified by HIGHRPM, 5:28 PM 3/14/2004]
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Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
Re: info on a 427! (HIGHRPM)
The fact that stock LS1 heads were designed for a 346 does not mean they will not work on a 427. It does mean they will not work very well and that is true of most of the stock LS1 parts from throttle body to exhaust manifolds and everything in between. That is why I stated that the rest of the stock parts could be pressed into service, if need be. Frankly, I would not want to put money into building a 427 shortblock without stage 3 heads, a more aggressive cam and headers at the very least, but to each his own :cheers:
Pro
Joined: Mar 2002
Posts: 712
Likes: 0
From: Santa Clarita Ca
Re: info on a 427! (Pumba)
Gary,
I would be worried about whoever put that add together.
The stock LS1-LS6 engine uses rods with a center to center distance of 6.104".
The stroke of the advertised 427 is 4.000".
Therefore, the center to center distance of the new rods should be 0.378" shorter than the standard rod - 5.726".
Instead, they advertise a rod with a center to center distance of 6.125". Thats a difference of 0.399" . With that rod length, either the pin is moved up so high that you won't have room for rings, or the piston will extend about the block's deck.
:nono: :confused:
[Modified by Pumba, 6:25 PM 3/14/2004]
I would be worried about whoever put that add together.
The stock LS1-LS6 engine uses rods with a center to center distance of 6.104".
The stroke of the advertised 427 is 4.000".
Therefore, the center to center distance of the new rods should be 0.378" shorter than the standard rod - 5.726".
Instead, they advertise a rod with a center to center distance of 6.125". Thats a difference of 0.399" . With that rod length, either the pin is moved up so high that you won't have room for rings, or the piston will extend about the block's deck.
:nono: :confused:
[Modified by Pumba, 6:25 PM 3/14/2004]
6.125" rod length is correct...look at my 427 build pics and you'll see the same combination.
Le Mans Master
Joined: Apr 1999
Posts: 7,820
Likes: 0
From: Burlington ON
Cruise-In I, II, III, IV & V Veteran
CI-I & II Auto-X Champ
Re: info on a 427! ('97 C5)
6.125" is the correct rod length for a 4.00" stroke LS1. The longer rod is required to reduce the rod angle and thus lessen the side-load on the cylinder wall. The wrist pin is moved up higher in the piston for longer rods. My 436ci with a 4.125" stroke uses 6.2" rods.
Basically all your current engine parts will be used except for internal stuff such as rods, crank, pistons, etc. Your head castings would most likely be used, but with all new valvetrain components. A 427 looks no different than your stock motor really other than maybe the little bit of your long tube headers you would be able to see instead of the stock exhaust manifolds. Your stock ignition system is fine, except for probably the spark plugs. Your stock fuel system will work fine, but you will need larger fuel injectors.
If you have any questions or are interested in any information on any of the 427ci LS1 engines Agostino Racing Engines (ARE) has to offer, feel free to drop me an email.
[Modified by MattG, 3:35 PM 3/15/2004]
Basically all your current engine parts will be used except for internal stuff such as rods, crank, pistons, etc. Your head castings would most likely be used, but with all new valvetrain components. A 427 looks no different than your stock motor really other than maybe the little bit of your long tube headers you would be able to see instead of the stock exhaust manifolds. Your stock ignition system is fine, except for probably the spark plugs. Your stock fuel system will work fine, but you will need larger fuel injectors.
If you have any questions or are interested in any information on any of the 427ci LS1 engines Agostino Racing Engines (ARE) has to offer, feel free to drop me an email.
[Modified by MattG, 3:35 PM 3/15/2004]
