SLP is putting together some low cost but high quality rotating assemblies that can be used with GM's LQ9 iron 6.0-liter block. 383 and 402 cubic inch displacements will be available. Here is a quick rundown of what they are producing and what we will have to offer -

ZL 383 - low compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
3.899" heavy-duty, high-compression 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
383-CID displacement
9:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for forced-induction applications
Includes new rod and crank main bearings


ZL 383 - high compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
3.899" 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
383-CID displacement
10.8:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Includes new rod and crank main bearings

ZL 402 - low compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
3.899" heavy-duty, high-compression 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
383-CID displacement
9:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for forced-induction applications
Includes new rod and crank main bearings

ZL 402 high compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
3.899" 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
383-CID displacement
10.8:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Includes new rod and crank main bearings
More details for each of these can be found on our website. Pricing for each kit is $2499.99. We're currently taking pre-orders and should be able to start shipping around the 1st of September.

 

Both the 383 and 402 kits list 3.899" pistons.

 

Both the 383 and 402 list 3.899" pistons and 383-CID displacement. Is that correct?

 

Nope--the 402" will have to have a 4" piston and bore-4" stroke and 4" bore for a great square motor, with some of the new intake, exhaust/header combos and some of the cams I would think 500/500 at the wheel would be very reasonable or drop CR and TT it--

 

I kinda dislike the idea of putting an iron block up front...heard any rumors about the availability of the LS2 block?

 

Ditching the A/C system just about makes up for the extra weight of the LQ4 block

Keith

 

FWIW, when upgrading your rotating assembly, be sure to upgrade your crank damper... Here is a good one that works, can be rebuilt and is used in all Nascar engines... (its on my eninge too) Lots of good info on that site about the dynamics of a crank shaft and why it is good to upgrade the damper. One article was saying that the damper can actually increase HP at high rpm... something to think about anyway.

http://www.atlanticspeed.com/store/A...%20Dampers.asp

http://www.atiperformanceproducts.co...amper_tech.htm

Here is a must read article...
http://www.atiperformanceproducts.co...mper_dinan.htm

VR

 

This just made my stroker or no stroker decision for me. I'll be calling you next month. Andy

 

There was a typo above. It should have said -

ZL 402 - high compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
4.000" 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
402-CID displacement
11.3:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Includes new rod and crank main bearings

and

ZL 402 - low compression -

4.000" 4340 forged steel crankshaft, balanced to rotating assembly
4.000" heavy-duty, low-compression, 2618 forged alloy pistons (includes new rings and full-float pin)
6.125" I-beam rods
402-CID displacement
9:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for forced-induction applications
Includes new rod and crank main bearings

A good example of why I don't work 15+ hours every day

 

How much weigh does this add to the front end?

 

I think 75 lb. for iron

 

If I dont want to add weight to the front end couldnt you just buy the rotating assembly and put it in a stock zo6 block? With blower heads and cam and a TT or D1 do you think one could put out 700 rwhp reliably?

 

With a TT easily. For an ATI you might want to go with the F1 head unit. If the tune is good then you shouldn't have any issues with this forged motor.

 

Is there any chance of getting a 4.03 bore piston with the kit instead?

 

So it is possible to keep the ls6 block and turn it into a 402? I there any downsides to doing this compared to the iron block? I'm about a month away from pulling the trigger on FI and dont want any problems with daily driveability. Shooting for 600-650 rwhp.