414 with l92 heads
Originally Posted by Bo Duke01
I could have a 427 with 4.06 bore and 4.125 stroke. Can you fit a 4.125 crank with 4.06 bore into an iron 6.0 liter?
Richard
TECH Resident
Joined: Oct 2004
Posts: 800
Likes: 1
From: Simi VAlley,CA
The guy who prepped my L92 heads got the intake side to flow over 300 cfm with practically no work, then he wanted to see what it would loose with my L76 intake on the head, it lost only 12 cfm.......that isn't bad for fairly stock stuff.
Originally Posted by Oscar Will
The guy who prepped my L92 heads got the intake side to flow over 300 cfm with practically no work, then he wanted to see what it would loose with my L76 intake on the head, it lost only 12 cfm.......that isn't bad for fairly stock stuff.
Thread Starter
On The Tree
Joined: Jun 2006
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Originally Posted by Chicago Crew UnderBoss
Yes you can as I had this exact same type of motor built for me by a tuner here 5 years ago. Just make sure the complete motor is BUILT by somebody who REALLY KNOWS what they are doing or you could have issues like i did with oil consumption and even my Callies 4.125 crank failing (but the crank issue should be a non issue for you) as long as the engine is built by somebody who really knows what they are doing.
You also need to get the ironblock sonic tested to make sure there is proper strength and cylinder wall thickness if she is getting bored out to 4.060!
You are better off in my opinion sticking with a 4 inch crank for 414 cubes as i believe the motor will last longer from a longevity standpoint, will use less oil and will have room left over in the cylinder walls for a rebuild if ever necessary! 4 inch stroke has the best track record on LS series motors and that is why you see companies lik KATECH sticking to 4 inch strokes in their motors built for GM RACING! 
Also, if you are planning to stay N/A i would stick with an alum. LS2 block or L92 block posted above for less weight restriction, etc.!
You also need to get the ironblock sonic tested to make sure there is proper strength and cylinder wall thickness if she is getting bored out to 4.060!
You are better off in my opinion sticking with a 4 inch crank for 414 cubes as i believe the motor will last longer from a longevity standpoint, will use less oil and will have room left over in the cylinder walls for a rebuild if ever necessary! 4 inch stroke has the best track record on LS series motors and that is why you see companies lik KATECH sticking to 4 inch strokes in their motors built for GM RACING! Also, if you are planning to stay N/A i would stick with an alum. LS2 block or L92 block posted above for less weight restriction, etc.!
I have heard that the most you should bore an ls2 out to is .020 and even that is pushing it. I have heard that you can bore irons out farther to about .060
Originally Posted by Bo Duke01
Also does anyone know where i can get a 4.060 piston at? I've looked at tsp and they only have ones up to 408 and i need 414. Will i have to custom order some?
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