Volk2142

Anyone making over or around 800 on a stock ls1/ls6 block with forged stock sized internals with boost? If so how is the block holding up? and what supporting mods do you have for it?

Turpid porpoise

There are plenty of LS guys at or above 800whp on stock dimensions using the OE block. There are even guys who have been over that power level on the OE block with OE internals. Just read the stickies in the Performance Results section and you can see all of the fastest/quickest C5's and their setups.

Volk2142

Ok thanks, I figured it can be done just wanted another persons thoughts on it

Turbo-Geist

792/748 on one dyno
https://www.corvetteforum.com/forums...792-748-a.html

Combo went 9.96@145 which is well over 800rw
https://www.corvetteforum.com/forums...n-the-9-s.html

I recommend a good tune and new head bolts and gaskets if you want any chance at reliability.

Volk2142

Been looking around at other engines as well. I like the long block LQ9 that TSP sells, but they might be just out of my price range. I was just curious on maybe just buying another ls1/ls6 engine block and building with that one. Mine has 100k plus and I don't like the idea of pushing that much power out of an old block. Either way I go, its gonna have thicker gaskets and 1/2" APR head bolts. Also wouldn't want to do stock pistons or rods.

Volk2142

I'd have be a nervous wreck with a stock bottom

SBCGENII

If you are buying another block don't buy a LS1. Get a LS2 or 3.

junk c5

The place that built my iron 6.0 motor (390cu) told me my identical shortblock has seen close to 1300 RWHP. Forged and ARP everything. It took 15lbs to make a single digit pass with a terrible 60 ft time.

Drewstein

I ran the TSP LQ9 short block rated to 800hp well into the 1200rwhp range before the rods bent. They make some stout motors there.

Next motor is being built at Cordes so I can make 1400rwhp or more.

FourG63 97GST

you're unnecessarily concerned about the block, any LS block will hold 1000+ if you can keep the heads on it. only concerning one's were the early 97-98 castings

winters97gt

Yeah, agreed. ECS has a car running 9.1's on the stock block with hundreds of passes. Definitely not something I'd recommend for the average Joe that is mitulous as Turbo Geist self tuning. 650 and enjoy. That aluminum block is not worth destroying if you're on a budget

ysb02

I'm in the same boat as you and I think I'm either going to get a 408ci LQ9 or 402ci LS2. The shop I'm using recommended using a gen 4 block over a gen 3. They've had a lot of success with the 5.3L but since I run mine on the street I want more low end grunt.

I thought about just doing rods/pistons on my stock LS6 but it's not much more to just get a shortblock and keep the LS6 in case the new motor grenades.

Volk2142

Yeah i am gonna keep my old one for uh ohs haha Then again I may just get forged pistons and slap some twins on it. I need new pistons anyway since one was very lightly kissed by the valve.

Volk2142

Paranoia at its finest lol

Volk2142

Its still in the air on the full plans. I might get new block, then might not. I was talking to ben yesterday evening about stuff and he cleared sme thoughts up pretty quickly

DOUG @ ECS

That car actually has thousands of passes on it and is still going strong. Go figure!

Jay - 4DRUSH has ran 8.1 with a stock cube LS2 also.

idontknow

What this guy said

My stock ls6 here and has been over 700hp for 4 years and counting.

BLWN1

I haven't kept up, not a YSI still is it...

helga203

http://www.trucktrend.com/how-to/eng...5-3l-big-bang/
Stock Gen3 engines are capable of 1000 hp easy. Head gaskets and tune is the key.
Check this article out.

DOUG @ ECS

Yes it is, but it has been sitting for awhile now.