Any De-Stroked LS7's Yet
 

Has anyone here has put together De-Stroked LS7. I have been considering something for my A&A Vortech supercharged 99 Vette and thought about LS7 block, L92 heads, L76 intake, etc. My purpose is to build a quick revving rpm machine. Any Thoughts?

Y? I'd rather see a stroked LS7.

We have a 5.7L LS7 called our Sneak Attack LS7.

You could put in a stock LS1 crank and get 387 c.i.
I wouldn't want to... but you could do it.

How about the original (2004?) CTS-V R engine? Wasn't that basically a small LS7 about 3 years early? You guys had some part in that, didn't you?

Yes, the Street Attack LS7 design came from concepts originally developed for that program.

the short stroke 5.7 is a 7.0 block and a 4.8 crank

That would sweet!!!

Dave (aka 427 LS1) just told me about a 388ci LS7 block setup with Callies 3.62" stroke lightweight crank setup/Oliver rods with ARE dry sump oiling that had crazy throttle response. All-Pro LS7 heads and LS7 intake....

They built the motor for a C5 road race Vette. I think it just got running and no dyno numbers yet. He said you blipped the throttle and it revved instantly.

I had the first all-bore 382ci LS1 on the net, and that sucker loved to rev. Probably one of the best all-around daily drivable engines I've owned yet. But, now I prefer more cubes since cranks are much cheaper now than they used to be.

I have a 3.41" crank in a c5r which was , I believe , designed to run in the under 6 litre class at Le mans. I don`t now how it runs yet as I am still trying to source parts and detune it . It currently has 4.175" pistons running in a dry liner.
http://i125.photobucket.com/albums/p...s/100_0810.jpg

that'd be an incredibly fun motor :D

...just how high reving are we taliking?

I think my next one will be high revving like that

I don't think this combo would necessarily rev any higher than other combo's due to lifter technology, but as mentioned by other posts it will build revs quickly

The way to make an engine accelerates faster is not with shorter stroke but with lighter parts. Then with a short or a longer stroke the engine will accelerate faster!

Like said above- the fast revving nature of an engine can be attributed to the weight of the reciprocating assembly, but also the cam specs, dynamic compression ratio, and timing table of the tune. A 382 LSX with more stroke than bore can rev just as fast. If anything it might rev a tad quicker in theory with a few less grams in each piston and in the counterweight.

Just the physical nature of the shorter stroke will make an engine turn 1 revolution quicker. I certainly agree that lightweight internals and valvetrain components contribute towards increasing an engines ability to build revs quickly & to sustain them. I also agree that cam selection, compression, timing, etc., play their role in the acceleration ramp of the motor. As far as a longer stroke building rpm's quicker, I disagree. Please correct me if I am wrong, but it seems to me that statement is confusing piston speed with engine revolutions. On 1 revolution of an engine the engine with the longer stroke will have faster piston speed. Conversly speaking, the same two engines with piston speed remaining equal, the engine with a longer stroke travels more distance thus slowing down the turn of a crankshaft.

Longer stroke engines certainly accelerate the car faster when in gear and going down the track so I guess they must also be accelerating the engine faster too!

If you're just free revving an engine then who knows but if you can do something to make more power and the engine's internals do not weigh much more then it will rev even faster.

Have you ever heard a Top Fueler blip the throttle? These engine have massive big block stroke and yet have only small block bores and also super heavy rotating components by they also have extreme power so they rev up like nothing you've ever heard!