would a 433ci (7.1L) aluminum LS1 last?

**curtains** · 09-08-2009, 02:56 PM

this is just outa curiosity ...

Ok so I know theres stroker kits (4.0in stroke), and i know theres big bore pistons(4.155in bore), so was wondering if i got the aluminum LS1 and put sleeves on it and put the whole lot together making it 433ci (7.1L), or 428ci pretty much same as a LS7, how long would this motor last? and how much NA power could you make? cause i mean people seem to turbo or supercharge them at 5.7 or 6L so a NA 7.1L one should hold right? cause its pretty much a LS7 in a LS1 block.

Calculations below for anyone that wants to see

pi(3.14159265) x (4.155(bore)/2)^2 = 13.5591335123540625 (surface area of piston in square inches)

13.5591335123540625 x 4.0(stroke) = 54.23653404941625 (volume of a cylinder in cubic inches)

54.23653404941625 x 8 = 433.89227239533 (total volume of engine in cubic inches)

**00z28bubba** · 09-08-2009, 03:12 PM

Originally Posted by curtains

this is just outa curiosity ...

Ok so I know theres stroker kits (4.0in stroke), and i know theres big bore pistons(4.155in bore), so was wondering if i got the aluminum LS1 and put sleeves on it and put the whole lot together making it 433ci (7.1L), or 428ci pretty much same as a LS7, how long would this motor last? and how much NA power could you make? cause i mean people seem to turbo or supercharge them at 5.7 or 6L so a NA 7.1L one should hold right? cause its pretty much a LS7 in a LS1 block.

Calculations below for anyone that wants to see

pi(3.14159265) x (4.155(bore)/2)^2 = 13.5591335123540625 (surface area of piston in square inches)

13.5591335123540625 x 4.0(stroke) = 54.23653404941625 (volume of a cylinder in cubic inches)

54.23653404941625 x 8 = 433.89227239533 (total volume of engine in cubic inches)

im sure someone else will chime in with more info but to start this off i know resleeving an aluminum block is pricey. you must have a nice budget if you want to make sure its an ls1 block.

**curtains** · 09-08-2009, 04:02 PM

Well me personally, i plan on just twin turboing my 5.7L LS1 and I'll be more than happy with the 500ish hp it'll make, but was just curious of how strong this would be and how much power it could make, its mostlikely cheaper to just buy a LS7 get forged internals.

**c5z28** · 09-08-2009, 05:08 PM

You can stroke it to a 427ci someone asked the same question

http://www.ls1tech.com/forums/genera...k-427ci-2.html

**00z28bubba** · 09-08-2009, 07:13 PM

Originally Posted by curtains

Well me personally, i plan on just twin turboing my 5.7L LS1 and I'll be more than happy with the 500ish hp it'll make, but was just curious of how strong this would be and how much power it could make, its mostlikely cheaper to just buy a LS7 get forged internals.

are you dead set on using an aluminum block. gm makes an iron block 6.0 that is identical to an ls1 aside from being a bit bigger. lower compression, tried and true set ups to keep the guesswork out of the every aspect of the build. its a 364 if i remember right but can be stroked to a 408. usually when built for a solid n/a set up they are around low 500s to the crank. mid 400s to the wheels. can be set up for boost and go way past that 500whp mark.

**curtains** · 09-08-2009, 11:18 PM

Well this is all outa curiosity, cause i figured a iron block would handle it rather well, since LSX (which is pretty much a iron LS7 which will essentially similar to a Iron stroked and bored out LS1) can handle well over 2500hp. I have no intentions of doing this at all. Like I said I just plan on TT my LS1 and I should have more than enough power.

Either way I'm not a big fan of cast Iron engines, Weights too much, and only really good for straight lines.

**c5z28** · 09-08-2009, 11:22 PM

If you plan on the aps twin turbo be careful there turbos have been failing and have been giving out zero help.

**mark21742** · 09-09-2009, 01:24 AM

a stock iron block only weighs 85 pounds more than an aluminum block and can hold together when making much more power.
but if you really want to stay aluminum block, there is atleast one company that makes a 1inch thick deck plate and longer sleeves for the ls1 to get up to 500 ci

**curtains** · 09-09-2009, 05:02 AM

Originally Posted by mark21742

a stock iron block only weighs 85 pounds more than an aluminum block and can hold together when making much more power.
but if you really want to stay aluminum block, there is atleast one company that makes a 1inch thick deck plate and longer sleeves for the ls1 to get up to 500 ci

Are the fully dressed iron long blocks only 85lbs more? and if you still have it could i have the source plz thanks (just cause i wana have a look for my self), but still 85lb is pretty heavy at the front of the car.

**mark21742** · 09-09-2009, 07:19 AM

Originally Posted by curtains

Are the fully dressed iron long blocks only 85lbs more? and if you still have it could i have the source plz thanks (just cause i wana have a look for my self), but still 85lb is pretty heavy at the front of the car.

the GM LS1 Service manual it states a 183lbs weight for the 6.0L block and a 91lbs weight for the LS1 block.

all other parts (heads, cam, oil pan) swap over

**blackbirdbrain89** · 09-09-2009, 11:31 AM

hell while ur at it make a 4.8 in to a 7.1...lol now that might take some time on the bore

**00z28bubba** · 09-09-2009, 04:16 PM

Originally Posted by mark21742

the GM LS1 Service manual it states a 183lbs weight for the 6.0L block and a 91lbs weight for the LS1 block.

all other parts (heads, cam, oil pan) swap over

+1. and 80 lbs up front just means a bit of replacement of susp with stronger lighter parts or relocation/deletion of some parts. i dont think the 80lbs cancels out 150hp of a stroker.

**mark21742** · 09-09-2009, 07:23 PM

Originally Posted by 00z28bubba

+1. and 80 lbs up front just means a bit of replacement of susp with stronger lighter parts or relocation/deletion of some parts. i dont think the 80lbs cancels out 150hp of a stroker.

yup, tubular K member and battery relocation should have the frontend close to stock weight again, egr and air delete, lt headers and it might even be a hair lighter than stock

**00z28bubba** · 09-10-2009, 09:34 AM

Originally Posted by mark21742

yup, tubular K member and battery relocation should have the frontend close to stock weight again, egr and air delete, lt headers and it might even be a hair lighter than stock

dont forget ac delete. hell tubular front suspension all together. at least whats on the market anyhow. more than makes up for that measly 85 lbs.