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TBYRNE Performance
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Discussion Starter #1 (Edited)


SLP will soon have very affordable 402 short blocks ready to ship with no core required!

Crate-Engine-Assembly, "ZL-402" LS1 Short Block (High Compression)

With GM’s versatile "Gen III" small-block gaining popularity as the foundation for a wide range of high-performance engine build-ups, market demand for an affordable LS1 stroker package has become increasingly intense. In response, SLP Performance Parts has devised a revolutionary new Gen III stroker short-block assembly, one that offers unexcelled performance and durability at a truly accessible price.

Dubbed the "ZL-402" to reflect its beastly 402-cubic-inch displacement, the package is chockablock with such race-proven hardware as a new GM LQ9 block, a 4.00" forged steel crank, and 4.00" forged aluminum pistons. With the right cam and heads and a properly tuned PCM, the ZL-402 is fully capable of producing over 575 hp and a similar amount of torque in naturally aspirated form.

This package is sold only in short-block form, minus manifolds, camshaft, oil pump, and other ancillary equipment. The obvious advantage of this approach is that it allows each customer to formulate a parts combination that is perfectly suited to his or her needs. (For those who prefer "one-stop shopping," SLP offers a host of uninstalled options on an à la carte basis.)

Although designed primarily for use in late-model F-Bodies and Corvettes, the ZL-402 also makes a superlative choice for most street-rod, muscle-car, and truck applications. Best of all, it’s sold outright, eliminating the shipping hassles, protracted vehicle downtime, and additional out-of-pocket expenses associated with core returns.


Features
Built entirely from brand-new parts.
Sold outright*no cores required!
GM LQ9 iron 6.0-liter block (includes block plugs)
4.000" 4340 forged steel crankshaft, balanced to rotating assembly
4.000" 2618 forged alloy pistons (includes new rings and full-float pins)
402-CID displacement
6.125" I-beam rods
Includes new, factory-installed cam, rod, and main bearings.
11.3:1 compression ratio (nominal; ultimate compression ratio will depend upon heads and gaskets used)
Designed for naturally aspirated applications
Meticulously assembled to OEM tolerances and specifications.
Oil pump, timing chain, camshaft, pans, plates, and covers not included.

Looking for less compression? There will also be a 9:1 version available!

More details for each of these can be found on our website. We're currently taking pre-orders to provide you with one of the first that become available. They are expected to start shipping around September 1st! Our price is $3499.99 for each with NO core exchange required!
 

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Is the 9:1 version the same price?

How much boost can I put that under?

Is the install a direct swapp? How much in labor?
Thanks.
 

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13 year owner
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16,379 Posts
That works for me. :D

The only downside is that it is a cast iron block, so you lose the weight advantage.
 

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Gone but not forgotten
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CMNTMXR57 said:
That works for me. :D

The only downside is that it is a cast iron block, so you lose the weight advantage.

hoooftyyy. the GTO would be real HOG then!
 

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13 year owner
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16,379 Posts
It's a cost vs. benefit thing though. You gotta give up some weight to make easy power.

It's an interesting conundrum.
 

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13 year owner
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16,379 Posts
Also, if you add all your own oil pump, intake, cam and the other ancillary items YOU want, all you have to do is drop the motor in. That is a pretty simple process on this car. And at the end, the price would be equivalent of a S/C.
 

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CMNTMXR57 said:
The only downside is that it is a cast iron block, so you lose the weight advantage.
Darn, and I was thinking about this for the Dune Buggy.... Oh well. :D
 

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That's great, but I will wait for a 428. ( I know it's really a 427, but Pontiacs are supposed to have a 428.) Somewhere I read that you can have your LS1 aluminum block sleeved to get the right bore for a 428. Probably more$$$ than I can afford right now.
 

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I like the idea of the 402. Minimal downtime and the price is extrememly attractive. I will probably look to do this early next year. Someone suggested a C5R block but I think that's way out of my budget.
 

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Autobahn Fahrer
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2,811 Posts
Doric said:
What OEM heads would people recommend with this block? Could I use factory LS6 heads, for example?
Yes, you could. Though, I'm hearing good things about the AFR heads that are on the market. I've dealt with them before and even before the heads that I bought were shipped they had e-mailed me about a slight visual imperfection that wouldn't be visible once the heads were installed. They discounted the price by a few hundred dollars. The whole while taking the initiative to be upfront and honest.
 

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What gains would you get if you added the LS6 heads and cam to this package ? could I just swap the rest of the stuff over from my LS1..
oh.. by the way.. Hi to everyone on the board.. just picked up a blk/blk M6 last week..
 

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congrats and welcome to the board. w/ ls6 heads they are saying 575 crank hp. Probably somewhere in the high 400whpto low 500whp range w/ full boltons and FAST intake and tb.
 

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13 year owner
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Warren said:
Darn, and I was thinking about this for the Dune Buggy.... Oh well. :D
It'd take you alot to blow it!

O.G. look at your post for my comments, I'm having problems again.
 

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13 year owner
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Absolutley. :)
 
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