Any De-Stroked LS7's Yet
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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?
Originally Posted by NemesisC5
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?
We have a 5.7L LS7 called our Sneak Attack LS7.
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From: Upstate NY
Originally Posted by Katech
We have a 5.7L LS7 called our Sneak Attack LS7.
Originally Posted by Old SStroker
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.
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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.
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.
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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.
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Responses are mostly what I expected, mixed but with mostly good responses for the combinations excellent higher rpm response 
The desire for High Performance Street Cars is driving sales up in the growing tuner market like never before. It is a reality today to those of us that went through the times of gas rationing and absolutely NO NEW HIGH PERFORMANCE AMERICAN MUSCLE CARS were being produced. I remember from my high school days a friend that had a De-Stroked 400 down to 377cid and it was a screamer. I also remember the old Z-28 with the 302cid that was developed so Chevy would have a car to compete against the Boss 302 in Trans Am racing. My point is that the "short stroke" combination can really make a car fun to drive with the faster building revs and the HP to turn some quick laps. Different STROKES for different folks 
The desire for High Performance Street Cars is driving sales up in the growing tuner market like never before. It is a reality today to those of us that went through the times of gas rationing and absolutely NO NEW HIGH PERFORMANCE AMERICAN MUSCLE CARS were being produced. I remember from my high school days a friend that had a De-Stroked 400 down to 377cid and it was a screamer. I also remember the old Z-28 with the 302cid that was developed so Chevy would have a car to compete against the Boss 302 in Trans Am racing. My point is that the "short stroke" combination can really make a car fun to drive with the faster building revs and the HP to turn some quick laps. Different STROKES for different folks Last edited by NemesisC5; Jan 23, 2007 at 06:12 PM.
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Originally Posted by THE_SUPRA
...just how high reving are we taliking?
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.
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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.
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From: Houston, Tx.
Originally Posted by NemesisC5
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.
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!