Need opinions on which block to choose
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TECH Regular
iTrader: (11)
Joined: Sep 2006
Posts: 405
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From: P'cola, FL / Okc, OK
Need opinions on which block to choose I am putting together plans for a ground up engine build for an 02 Z28. I am currently running an STS kit @ 5psi. on an LS6 block and the STS will be carried on to the project motor.
I was thinking of using the 6.0L iron block for a foundation. Any input on this block and it's capabilities would be much appreciated! I saw an LS iron block on GM Parts Direct p/n 12572808 9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin
Would this be an acceptable block for this build up? Plans are looking like to stroke it, run around 7-10 psi. boost level, no No2, no sure baout cam, intake, valvetrain and specs. on bottom end. Just trying to take this one part at a time to ensure a proper build.
Any input would excellent and appreciated.
I was thinking of using the 6.0L iron block for a foundation. Any input on this block and it's capabilities would be much appreciated! I saw an LS iron block on GM Parts Direct p/n 12572808 9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin
Would this be an acceptable block for this build up? Plans are looking like to stroke it, run around 7-10 psi. boost level, no No2, no sure baout cam, intake, valvetrain and specs. on bottom end. Just trying to take this one part at a time to ensure a proper build.
Any input would excellent and appreciated.
On The Tree
Joined: Dec 2004
Posts: 189
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From: Rochester, NY
Not too much expertise here, but a 6 liter sounds like a good start. Of course a new LS6 would still be a good foundation, but I'm guessing you want something else since you're already running that block. What are you looking to do with it?
Thread Starter
TECH Regular
iTrader: (11)
Joined: Sep 2006
Posts: 405
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From: P'cola, FL / Okc, OK
I am currently running an STS kit @ 5psi but would like to lower compression,stroke and boost 7-10 psi. I am taking the build one step at a time but once I figure out block style I will look at pistons, cam, valvetrain, heads, intake and etc.
The LQ4 and LQ9 block part number (and most all of the other parts except the rotating assemblies) are the same for any given year of production. For a forced induction application like you are describing, I believe that these blocks are your best starting point. A good forged bottom end and the 72 cc 317 castings properly ported will serve you well. You might want to go to a 4.00" stroker crank and leave the bore alone if it is a new block. I would do a hone with a deck plate even if it is a new block.
The 100 pound or so weight penalty is not very much when you consider the durability of these blocks at high power levels under boost.
Just my opinion.
Steve
The 100 pound or so weight penalty is not very much when you consider the durability of these blocks at high power levels under boost.
Just my opinion.
Steve
Originally Posted by OreoLt1
I am putting together plans for a ground up engine build for an 02 Z28. I am currently running an STS kit @ 5psi. on an LS6 block and the STS will be carried on to the project motor.
I was thinking of using the 6.0L iron block for a foundation. Any input on this block and it's capabilities would be much appreciated! I saw an LS iron block on GM Parts Direct p/n 12572808 9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin
Would this be an acceptable block for this build up? Plans are looking like to stroke it, run around 7-10 psi. boost level, no No2, no sure baout cam, intake, valvetrain and specs. on bottom end. Just trying to take this one part at a time to ensure a proper build.
Any input would excellent and appreciated.
I was thinking of using the 6.0L iron block for a foundation. Any input on this block and it's capabilities would be much appreciated! I saw an LS iron block on GM Parts Direct p/n 12572808 9.240" deck height, 3.98" bore, 6 bolt main, nodular cap material, standard LS crankshaft journal diameter. wet oiling, 1 piece seal, 4.00" max stock, 500 max horsepower, street usage, LQ9 origin
Would this be an acceptable block for this build up? Plans are looking like to stroke it, run around 7-10 psi. boost level, no No2, no sure baout cam, intake, valvetrain and specs. on bottom end. Just trying to take this one part at a time to ensure a proper build.
Any input would excellent and appreciated.
The LS6 block is good for 800+ hp, you just need a forged piston and rod.
The 402 might be better to do first, then the STS... There is a slight chance you can hurt a stock piston at 500rwhp... the 402 just warms up at 500rwhp
The 402 might be better to do first, then the STS... There is a slight chance you can hurt a stock piston at 500rwhp... the 402 just warms up at 500rwhp
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Originally Posted by SLED28
The LS6 block is good for 800+ hp, you just need a forged piston and rod.
The 402 might be better to do first, then the STS... There is a slight chance you can hurt a stock piston at 500rwhp... the 402 just warms up at 500rwhp
The 402 might be better to do first, then the STS... There is a slight chance you can hurt a stock piston at 500rwhp... the 402 just warms up at 500rwhp
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