Re-Sleeving LS4's for larger displacement
Even cranks shouldn't be a problem given enough demand/dollars! I think a good topend Intake/heads/cam should produce some real good power (400-500HP) outta a 325 CID LSX! Does anyone have bore/stroke specs on a LS4? I tell ya a decent intake with a LS6 cam alone should do damage!
Thread Starter
Teching In
Joined: Nov 2007
Posts: 5
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I plan the standard LS2 4" bore with pistons to match. SLP has an L92 head/intake package for LS2's, and with a Livernois Motorsports Stage II cam, GM High Tech Performance did a dyno with this combo and got 546hp. Of course the trans will need to be built much stronger. I'm not sure which way to go in the cam b/c of the Active Fuel Management/DOD.
Even cranks shouldn't be a problem given enough demand/dollars! I think a good topend Intake/heads/cam should produce some real good power (400-500HP) outta a 325 CID LSX! Does anyone have bore/stroke specs on a LS4? I tell ya a decent intake with a LS6 cam alone should do damage!
Thread Starter
Teching In
Joined: Nov 2007
Posts: 5
Likes: 0
Even cranks shouldn't be a problem given enough demand/dollars! I think a good topend Intake/heads/cam should produce some real good power (400-500HP) outta a 325 CID LSX! Does anyone have bore/stroke specs on a LS4? I tell ya a decent intake with a LS6 cam alone should do damage!
http://www.gmtuners.com/LS4/index.htm
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From: CT
I believe Notime is correct... we're 325 ci....
in addition to lsxregal's link, here's specs from GM as well:
Displacement (cu. in./liters) 325/5,328
Bore x stroke (in.) 3.78 x 3.62
Bore x stroke (mm) 96.0 x 92.0
Compression ratio 10.0:1
Block material cast-aluminum
Cylinder head material cast-aluminum
Valvetrain configuration OHV
Valves per cylinder 2
Ignition system coil-near-plug
Lifters hydraulic roller
Cam drive chain
Redline (RPM) 6000
Horsepower @ engine RPM 303 @ 5600
Torque (lb.-ft.) @ RPM 323 @ 4400
go here and enter 5.328 liters and hit the convert button...
http://www.csgnetwork.com/cubicinchlitercvt.html
http://www.4lo.com/calc/literstocid.htm
in addition to lsxregal's link, here's specs from GM as well:
Displacement (cu. in./liters) 325/5,328
Bore x stroke (in.) 3.78 x 3.62
Bore x stroke (mm) 96.0 x 92.0
Compression ratio 10.0:1
Block material cast-aluminum
Cylinder head material cast-aluminum
Valvetrain configuration OHV
Valves per cylinder 2
Ignition system coil-near-plug
Lifters hydraulic roller
Cam drive chain
Redline (RPM) 6000
Horsepower @ engine RPM 303 @ 5600
Torque (lb.-ft.) @ RPM 323 @ 4400
go here and enter 5.328 liters and hit the convert button...
http://www.csgnetwork.com/cubicinchlitercvt.html
http://www.4lo.com/calc/literstocid.htm
__________________
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
I believe Notime is correct... we're 325 ci....
in addition to lsxregal's link, here's specs from GM as well:
Displacement (cu. in./liters) 325/5,328
Bore x stroke (in.) 3.78 x 3.62
Bore x stroke (mm) 96.0 x 92.0
Compression ratio 10.0:1
Block material cast-aluminum
Cylinder head material cast-aluminum
Valvetrain configuration OHV
Valves per cylinder 2
Ignition system coil-near-plug
Lifters hydraulic roller
Cam drive chain
Redline (RPM) 6000
Horsepower @ engine RPM 303 @ 5600
Torque (lb.-ft.) @ RPM 323 @ 4400
go here and enter 5.328 liters and hit the convert button...
http://www.csgnetwork.com/cubicinchlitercvt.html
http://www.4lo.com/calc/literstocid.htm
in addition to lsxregal's link, here's specs from GM as well:
Displacement (cu. in./liters) 325/5,328
Bore x stroke (in.) 3.78 x 3.62
Bore x stroke (mm) 96.0 x 92.0
Compression ratio 10.0:1
Block material cast-aluminum
Cylinder head material cast-aluminum
Valvetrain configuration OHV
Valves per cylinder 2
Ignition system coil-near-plug
Lifters hydraulic roller
Cam drive chain
Redline (RPM) 6000
Horsepower @ engine RPM 303 @ 5600
Torque (lb.-ft.) @ RPM 323 @ 4400
go here and enter 5.328 liters and hit the convert button...
http://www.csgnetwork.com/cubicinchlitercvt.html
http://www.4lo.com/calc/literstocid.htm
! 
Staging Lane
Joined: Oct 2006
Posts: 69
Likes: 0
Yes the LS4's connecting rods are 6.098 inches long powdered metal rods. Not sure if they are the exact same p/n though. I imagine that GM would cut costs buy using the same parts that are common to differant engines though ie: rods, rockers, pushrods . . . .
