i have no knowledge on this subject, but was curious on how you would build a 427 ls1. the main quistion is what block to use.

 

ARE/MTI....two of the best proven blocks on the market..accept no substitutes...

 

C5R block is full-proof N/A setup.

 

Well the C5R block is your best bet but, it is pricey. I have used a few ARE blocks and they have been pretty good. We have had no leaking out of them. People on the board have had leaking problems with the MTI blocks. Give me a call if you would like to discuss this further.

Thanks

 

if 6000 is in ur budget for a block then yes..C5R like they said...but ARE/MTI/AP.....especially w/the new sleeves that are out....all will do u good and come w/a warranty.

 

can you do it with a stock block or even a 6.0l truck block?

 

You can get 422 cu in out of an iron block. As for your stock block, thats what the guys above are referring to. Having your stock block sleeved to 4.125 Vs the current bore of 3.898. With a 4" crank, this would give you a 427 cu in motor.

Personally, if you can afford it go with the C5R block, if not stick with Iron. Give these new sleeves some time to prove themselves.Just my .02

 

is there a formula to figure CUs of your motor.

 

Taken from LS1Info.com

Formulas for displacement, bore and stroke

pi/4 = 0.7853982

cylinder volume = pi/4 x bore^2 x stroke

stroke = displacement / (pi/4 x bore^2 x number of cylinders)

Formulas for compression ratio

(CylVolume + ChamberVolume) / ChamberVolume

cylinder volume = pi/4 x bore^2 x stroke

chamber volume = cylinder volume / compression ratio - 1.0

displacement ratio = cylinder volume / chamber volume

amount to mill = (new disp. ratio - old disp. ratio / new disp. ratio x
old disp. ratio) x stroke

Formulas for piston speed

piston speed in fpm = stroke in inches x rpm / 6

rpm = piston speed in fpm x 6 / stroke in inches

 

And here's the CR5 Block from our sponsor SDPC.

http://www.sdpc2000.com/cart.asp?act...=1978&pid=8227

 

that is crazy expensive. how much could you build one out of a 6L block

 

What kind of money would I be looking at for a Darton wet sleeved block with a 4.125" bore? Does anyone offer any kind of deal on these?

 

anyway you slice it a 427 is gonna be hella expensive. it shouldnt be a money's no object kinda setup but you also dont want to cut corners and go cheap either. doing it right the first time will save headaches down the line.

 

i was planning on peice together over the course of a year and half. would only doing a 422 with an iron block save a lot of money. it seems to me that sleeving is what costs the most. for a 422 would it be a .060 witha 4" crank?

 

An .030 over iron block and a 4" crank will give you a 408/409. .060 isn't recommended due to the thickness of the sleeve although some people have done it on sonic tested blocks.

 

thanks for the help so far guys. i think i will go with an iron block but know for the internals? where is a good website to look for parts.

 

get in touch with a compitent engine builder; ARE, MTI, ect. they have the experience and can tell you exactly what is needed for a specific setup.

 

I have a C5R based 427 motor built by MTI and love it so far after the first 2000 miles on the brand new motor. At first, I tried to save $ and do the 427 ironblock using a 4.060 bore and 4.125 CALLIES crank and the motor was a FAILURE!!! Trying to cut corners and save $ ultimately cost me alot of extra $ and downtime with my car in the longrun. After my iron 427 with the 4.125 failed after only 3K miles on it, I was told that stroke was too excessive for that bore size in a 6 liter ironblock and not only did i have sig. oil consumption issues but the reluctor wheel on my crank as well as other welds on the crank FREAKIN BROKE causing the engine to die out (stall) and then backfire in the high rpms. From my experience and what i have been told by TOP tuners i would never again go with any stroke greater than 4.00 on a LS1 motor, especially utilizing an ironblock. If you stick with iron and want max cubes go with a 4.060 overbore only if you get it sonic tested first and if you don't plan on any N20 in excess of 100HP and DON't use a crank greater than 4.00 and stay the fruck away from CALLIES' Ls1 cranks!!! I believe a 4.060 overbore along with a 4.00 crank would give you around 414 cubes or so. I would play it safe myself and stock a 4.040 overbore on a iron motor with 4.00 crank for 409 classic chevy cubes which you could spray the **** out of is you so desired!!!

If i were you and you didn't want to shell out the excessive price of a C5R block and must get those classic chevy 427 cubes, i would go with one of the new darton sleeved alum. blocks offered by MTI, all with a 2 year 24K mile warranty also, to get your 427 cubes or stick with iron as set forth above. Call or email JAYSON or WAYNE and MTI and they will set you up with exactly what you need for a very fair price and killer warranty. There are no shortcuts when building a reliable big horsepower 427 cubic inch LS1/6 motor and you want to stick with the best who will stand behind their work 100% when it comes to this typ of investment. Sorry about the lengthy post but hope it was helpful to you.

Best of luck!

 

do you have a website for the darton blocks

 

http://www.strokerkits.com/ls1_sleeves.htm
https://ls1tech.com/forums/generation-iii-internal-engine/124552-re-sleeved-blocks.html