6.0 liter iron block ?s
6.0 liter iron block ?s I am planning on building and iron block 6.0l, what is the most stroke i can safely put in it, and how big can I go on the bore safely. this car is a daily driver but my daily drive is only 4.5miles each way.
ok, i was planning on going 4.06 on the bore with a 4.100 crank and a 6.125 rod, does anybody see any problems with this? I am also going to use l92 heads with the l76 car intake.
Last edited by bluegto1; Jan 11, 2007 at 12:44 PM.
I would just leave the block at 4.00 and use the money you save on boreing it out to buy better go fast parts. Watch the long stroke too, you can have issues with burning oil. Check out this thread --->Here
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Originally Posted by J's99Zrated
I would just leave the block at 4.00 and use the money you save on boreing it out to buy better go fast parts. Watch the long stroke too, you can have issues with burning oil. Check out this thread --->Here
I agree and would not personally go more than a 4.00 stroke on your engine as that is the battle tested big cubed stroke that works the best with LS style motors and will give you the best longevity and least amount of oil consumption.
OVerboring the motor to 4.030 is a no brainer for the classic 408 cubes and as long as you sonic test the block going to 4.060 will give you 414 cubes and this is another good way to go if you plan on staying N/A or don't plan more than a 100 shot or so.
If your going with the GAS or other F/I stick with 4.08 cubes for sure in my modest opinion. I had a brand new CALLIES 4.125 crank in a ironblock bored 4.060 for 427 cubes and the motor failed as the crank welds and reluctor wheel crapped out with the 4.125 Callies crank. This was built by one of the most well known tuners here and b/c of this I would stick with 4.00 crank and stay away from CALLIES LS style cranks as others have had similar problems with Callies LS stlye 4.125 cranks!!
cylinder wall thickness... the more you bore, the more material you're taking out of the block. boring the lq9 block .060 over makes for pretty thin cylinder walls, therefor not being able to withstand a lot of cylinder pressure from a big shot, or forced induction.
i'd say you could safely use the 4.125" crank, a lot of people have great combos with a .030 over/4.125" crank. they're 421 cubic inch motors. TOSTO, Tom the Roofer, and a bunch more have the same bore/stroke combo in an iron N/A motor
i wouldn't bore it out any more than .040 over. if you're starting with a NEW block, i say just leave the bore alone. if it's used, then you could go the standard .030 over (or less).
just to throw this in here..... the Eagle 4" crank is a very good piece and is a lot more affordable relative to the 4.125" units from other companies.
i'd say you could safely use the 4.125" crank, a lot of people have great combos with a .030 over/4.125" crank. they're 421 cubic inch motors. TOSTO, Tom the Roofer, and a bunch more have the same bore/stroke combo in an iron N/A motor
i wouldn't bore it out any more than .040 over. if you're starting with a NEW block, i say just leave the bore alone. if it's used, then you could go the standard .030 over (or less).
just to throw this in here..... the Eagle 4" crank is a very good piece and is a lot more affordable relative to the 4.125" units from other companies.
Last edited by Bryan @ Speed Inc.; Jan 11, 2007 at 01:08 PM.
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, thanks for all the insight there are A LOT of guys boostin' and sprayin' the **** out of 4.030" bore motors.
i say go for it! a lot of 408's get hit with 300+hp worth of the giggly gas, and others go for 20-30lbs of boost with no problem.
be sure to let us all know how it goes!!!
i say go for it! a lot of 408's get hit with 300+hp worth of the giggly gas, and others go for 20-30lbs of boost with no problem.
be sure to let us all know how it goes!!!
nope. like the others stated, there might be more oil consumption - but any way you have it... if you drive it hard, you're goin to burn more oil.
other than that, there shouldn't be any issues with that crank.
other than that, there shouldn't be any issues with that crank.
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Originally Posted by imslow
there are A LOT of guys boostin' and sprayin' the **** out of 4.030" bore motors.
i say go for it! a lot of 408's get hit with 300+hp worth of the giggly gas, and others go for 20-30lbs of boost with no problem.
be sure to let us all know how it goes!!!
i say go for it! a lot of 408's get hit with 300+hp worth of the giggly gas, and others go for 20-30lbs of boost with no problem.
be sure to let us all know how it goes!!!
Also, as long as you have the right person building the motor you shoud be fine with a 4.125 crank but most engine shops like LME will tell you to stick with a 4.00 crank. Call up some experts, call BRian at LME in fact, as he always picks up the phone (95% percent of the time) builds a killer motor (LME) at an affordable price and can answer all your questions even if you looking to slap together the motor yourself!!
Last edited by MTI 427 C5 Roadster; Jan 11, 2007 at 06:06 PM.
ok , i really appreciate all the input, so i have decided to go with the 418 (4.100 crank, 4.030 bore) now how big of a camshaft should i use,the car (2004 GTO) is stock weight six speed with a 3.46 rear end, i do drive the car daily and i like the how the car lopes now , it has a comp xer 232/236 592/598 on a 112 now and i like it.
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Sounds like it will be a monster. I would highly advise putting the biggest possible bore in that engine if you are using L92 heads to unshroud the Intake Valve. Have it sonic checked !!! This will be worth more power than using a 4.100 stroke over a 4" stroke.
Matt
Matt
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Originally Posted by matt346ls1
Sounds like it will be a monster. I would highly advise putting the biggest possible bore in that engine if you are using L92 heads to unshroud the Intake Valve. Have it sonic checked !!! This will be worth more power than using a 4.100 stroke over a 4" stroke.
Matt
Matt
Originally Posted by MTI 427 C5 Roadster
He is planning on spraying the **** out of this motor and knowing this do you think its wise to overbore anything past 4.04 even if the sonic test comes back ok? I would think 4.04 would be the ABSOLUTE biggest bore considering the plans for heavy N20 and he is better of staying at 4.030 (but he should have the block sonic tested regardless) and then talk to a professional who is going to help him with his engine build.
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Originally Posted by bluegto1
thanks abunch for your input, you and imslow have made up my mind to go with the 4.030 bore due to i am using a used block and my plans to spray the motor. What are your thoughts on a camshaft, i like the lope of a bigger cam but I dont like the xer lobes i have now due to valvetrain noise.
Your welcome and smart decision. I do not know on the cam and will defer that to the 6 liter iron motor stroker experts but would recommend you call a true expert like Allan Futural of Futral Motorsports, Brian at LME, Larry at Speed, Inc., etc., and they will help you spec out the perfect cam for your application. What heads you going to run?
Best of luck BRO!!
Last edited by MTI 427 C5 Roadster; Jan 12, 2007 at 04:17 PM.
i think he mentioned the l92 heads.
speedinc has a sweet stroker grind cam that i think would work well with your application.
it's a 242/250 114lsa - www.ls1speed.com
it should make plenty of power, work well with nitrous, and still idle decent. of course the tune makes all the difference. make sure you have a good tuner.
but your best bet would probably be to work with an engine builder on designing a custom cam specific to your set up and goals. happy motoring!
speedinc has a sweet stroker grind cam that i think would work well with your application.
it's a 242/250 114lsa - www.ls1speed.com
it should make plenty of power, work well with nitrous, and still idle decent. of course the tune makes all the difference. make sure you have a good tuner.
but your best bet would probably be to work with an engine builder on designing a custom cam specific to your set up and goals. happy motoring!