Mighty l92/ls3
Mighty l92/ls3 Since Im having trouble selling my shortblock I was condering doing a budget build with L92/ls3 topend. I just want to hear some opinions or feedback to see if its worth it.
Iron block bored out to 4.060
Off-set ground eagle crank to 3.70
6.25 eagle forged rods
Ross 8cc flycut reliefs
Ls7 lifters
Custom cam
Iron block bored out to 4.060
Off-set ground eagle crank to 3.70
6.25 eagle forged rods
Ross 8cc flycut reliefs
Ls7 lifters
Custom cam
No need for the offset ground crank. Thats just to get every last bit of CI for your class thats allowed. If not done correctly it will weaken the crank and its not budget friendly. If you are buying an aftermarket crank already why not just go 4"? Also I would stick with a 6.125 rod simply for ease of piston selection. I would go with a nice tie bar lifter over the LS7 ones.
That's actually the current set up on my shortblock, Its already put together. Ive been reading a lot about L92/Ls3 making good number so I was wondering if it would perform well with my shortblock since I have a 4" bore
Last edited by Outlaw E36; Feb 22, 2012 at 01:13 AM.
IMHO, it's the little things like this that make the difference. This one little thing may only be worth 5hp, but with four other things that make 5hp each as well and it adds up fast.
Who says they have to cost more? I went to a 4.060" bore and got the stock LS3 pistons for free when I most likely would have had to pay at least $200 for 4.030" pistons. Now I have 6 more cubic inches and my valve is further away from the bore wall.
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I would hope you could notice 20-25 more horsepower.
Who says they have to cost more? I went to a 4.060" bore and got the stock LS3 pistons for free when I most likely would have had to pay at least $200 for 4.030" pistons. Now I have 6 more cubic inches and my valve is further away from the bore wall.
Who says they have to cost more? I went to a 4.060" bore and got the stock LS3 pistons for free when I most likely would have had to pay at least $200 for 4.030" pistons. Now I have 6 more cubic inches and my valve is further away from the bore wall.
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I would say you would be pleased with what they can produce. This was in a Daily Driver.
Staging Lane
Joined: Jun 2010
Posts: 75
Likes: 1
This dyno is from my l92 headed 6.0. Very similar to what you are thinking of doing.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
Staging Lane
Joined: Jun 2010
Posts: 75
Likes: 1
This dyno is from my l92 headed 6.0. Very similar to what you are thinking of doing.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
I did a 4.065 iron block. L92 heads and LS3 intake race ported. 92mm TB. aftermarket valves and entire valvetrain. Diamond pop-ups. 11.5 to 1 on pump gas. made 504whp 489 TQ with the off the shelf Comp 231/239 cam. 1 7/8ths headers and dual 3 inch. SD tuned.
I would say you would be pleased with what they can produce. This was in a Daily Driver.
I would say you would be pleased with what they can produce. This was in a Daily Driver.
This dyno is from my l92 headed 6.0. Very similar to what you are thinking of doing.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
This dyno is from my l92 headed 6.0. Very similar to what you are thinking of doing.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
M6 car
Iron block 6.0. - stock cubes.
L92 heads milled to 64cc chamber.
TSP 233/239 .595/.605 114LSA
1-3/4 kooks longtubes
ls3 42lb/hr injectors
l76 intake
off brand 90mm throttle body
ls7 lifters
Dyno operator had to let off at 5300rpm due to driveline vibration. (later found out i had a dent in my driveshaft).
The rate of rise in hp over rpm im guessing it will be reeeeaalll close to 450.
And IIRC i had over .100" PTV at TDC.
How much did you mill to get 64cc chambers? .030"?
[QUOTE=Outlaw E36;15999899]This is very similar to what I had In mind. Who did the porting and how much did it cost you.? What was the cc on your heads.? I hope I get lucky and get good numbers like yours
Heads were stock CC and the exhaust was just ported at home.(I do Almost all my own machine work) I didn't see hogging out heads that flow 340's stock. Was looking to keep some type of velocity. I know milling to get compression is CHEAPER, but I have seen to many lose power by shrinking down the chamber. Pistons are always gonna cost more but I believe you will make more power. Especially when you are using a 2.16 intake valve.
Heads were stock CC and the exhaust was just ported at home.(I do Almost all my own machine work) I didn't see hogging out heads that flow 340's stock. Was looking to keep some type of velocity. I know milling to get compression is CHEAPER, but I have seen to many lose power by shrinking down the chamber. Pistons are always gonna cost more but I believe you will make more power. Especially when you are using a 2.16 intake valve.
