How to build a 427??
Thread Starter
Heel & Toe
Joined: Jun 2002
Posts: 19
Likes: 0
From: Keller TX
How to build a 427??
I am looking at building a 427 LS1/LS6/C5R engine. I was wondering what the best combo would be to get the most realiable and most powerful engine.
Option 1: use an LS1/LS6 block and bore it along with a stroke.
Option 2: use the C5R block that is already at 4.120" bore and use the stock 4" stroke.
I'm not sure which would be best. I'm leaning a little towards the C5R block b/c I would be able to rev it higher due to the shorter stroke. Thanks for any help/suggestions.
Option 1: use an LS1/LS6 block and bore it along with a stroke.
Option 2: use the C5R block that is already at 4.120" bore and use the stock 4" stroke.
I'm not sure which would be best. I'm leaning a little towards the C5R block b/c I would be able to rev it higher due to the shorter stroke. Thanks for any help/suggestions.
Le Mans Master
Joined: Aug 2001
Posts: 6,725
Likes: 5
From: Colesville MD
Re: How to build a 427?? (Brandon98TA)
http://www.katechengines.com/img/c5r/c5reng_bw.jpg http://www.katechengines.com/
Good luck.
Greg
:cool:
Good luck.
Greg
:cool:
Thread Starter
Heel & Toe
Joined: Jun 2002
Posts: 19
Likes: 0
From: Keller TX
Re: How to build a 427?? (YELLOHHH)
I didn't mean the raceing built C5R. You can buy the C5R block from Haltech and it can be built up like a LS1/Ls6 b/c it is just about the same thing, plus the block is only about $5800 if I remember correctly.
Team Owner
Joined: Jun 2001
Posts: 100,672
Likes: 2
From: Cleveland OH
Re: How to build a 427?? (Brandon98TA)
I dont think that the stock block can be bored and stroked to 427 .... but I think 422 is possible ...
the safest way might be to get the 427 block ...
the safest way might be to get the 427 block ...
Le Mans Master
Joined: Nov 2000
Posts: 7,391
Likes: 3
From: Chandler AZ
Re: How to build a 427?? (Brandon98TA)
Brandon,
If you prefer to stick with the LS1/LS6 block it will need to be bored and resleeved in preps for the larger bore pistons as well as clearanced for the larger stroke crank. You are right that a C5R block, with its 4.120 bore, is ready to accept your large bore pistons... plus with the shorter stroke the bore/stroke ratio is more square. Katech builds great motors. Give Nate a call Monday and I'm sure you can discuss specifics with him. :)
If you prefer to stick with the LS1/LS6 block it will need to be bored and resleeved in preps for the larger bore pistons as well as clearanced for the larger stroke crank. You are right that a C5R block, with its 4.120 bore, is ready to accept your large bore pistons... plus with the shorter stroke the bore/stroke ratio is more square. Katech builds great motors. Give Nate a call Monday and I'm sure you can discuss specifics with him. :)
Le Mans Master
Joined: Jul 2000
Posts: 7,758
Likes: 0
From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: How to build a 427?? (NewVetteLover)
I dont think that the stock block can be bored and stroked to 427 .... but I think 422 is possible ...
the safest way might be to get the 427 block ...
the safest way might be to get the 427 block ...
Some are now running 4.155 bores on LS1/LS6 blocks and using the 4.25 inch stroker crank would net you 461 cubic inches.
SW is running an all bore LS1/LS6 block at 4.155 bore with stock stroke netting 393 cubic inches.
Also if someone wanted to, they could get over 1000 HP NA using large cubes in a C5R block, a big cam, and C5R heads, which require a custom intake manifold. Of course sacrifice in streetability. Just takes money. :yesnod: :crazy:
[Modified by kewlbrz, 1:48 PM 6/15/2002]
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
Re: How to build a 427?? (Brandon98TA)
If you want to have over 500 RWHP in a reliable motor....go with the C5R block....I just bought one Team Chevrolet for $6100....Katech wanted $6800. The C5R block is much stronger and is designed for the stresses of racing....to start, I'm having it supercharged with 5-6 lbs of boost and expect over 650 RWHP. This setup could run 12-14 psi boost and get well over 800RWHP. Probably give the LPE TT 427 a run for the money. When my car is done I'll let you know what it dynos.
[Modified by HIGHRPM, 1:25 AM 6/16/2002]
[Modified by HIGHRPM, 1:25 AM 6/16/2002]
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Le Mans Master
Joined: Aug 2000
Posts: 6,447
Likes: 0
From: Scottsdale, AZ
Cruise-In III Veteran
Re: How to build a 427?? (HIGHRPM)
If you want to have over 500 RWHP in a reliable motor....go with the C5R block....I just bought one Team Chevrolet for $6100....Katech wanted $6800. The C5R block is much stronger and is designed for the stresses of racing....to start, I'm having it supercharged with 5-6 lbs of boost and expect over 650 RWHP. This setup could run 12-14 psi boost and get well over 800RWHP. Probably give the LPE TT 427 a run for the money. When my car is done I'll let you know what it dynos.
[Modified by HIGHRPM, 1:25 AM 6/16/2002]
[Modified by HIGHRPM, 1:25 AM 6/16/2002]
