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Photo 5
419 comments
trbo355
trbo355

Another great test would be to grab the 4.8 engine and cam it to the moon for some peak RPM tests to see what might fail. You could even put the stock heads back on with dual springs so expensive parts dont get destroyed (except the cam will probably get trashed). Even if power falls off after 7000 rpm, yank it to 8 grand a few times in the interest of science and see what happens! It would be a great valvetrain stability test as well. Plenty of turbo guys spin the 4.8 to 7400-7500 rpm with no reported failures due to the short stroke and piston speed. Make sure to videotape the carnage too :-)

trbo355
trbo355

Definitely some of my favorite atricles! Love all the Big Bang dyno tests done on various different engines but im disappointed a bit. They never live up to the title as nothing actually explodes. We still dont know the fail point of stock LS internals and no matter what engine the CX Racing 76mm turbos are bolted to, power seems to max out between 1200 to 1300 hp. You guys need to keep pushing it whether it takes a better set of turbos or a shot of nitrous to find the fail point. Rumors have it the stock head bolt arrangement gets sketchy at 1400 hp as does the cylinder bores. If i remember right, one drag week competitor split the cylinder wall on a stock 6.0 block around 1400 hp.

I would love to see a 6.0 motor run thru the same tests as the 4.8 and 5.3 motors. Sonic testing cylinder wall thickness on all 3 stock blocks might be interesting too to see what size motor is the strongest. Keep up the good work and find a 6 liter to blow up!

chrisdau123
chrisdau123

I am very thankful for people like y'all from truckin' magazine to hot rod and even chevy hi performance. No way in hell could the average chump like me be able to just test out a stock short block to see it's true capabilites! Luckily y'all are around to do this for us! This is true scientific experiment and it really helps out the average guys.. helps get us some sort of baseline and possible limitations for what we may be doing in our own garages to get some real big home grown ponies.


It's amazing what kind of beating an engine can take if you take the proper precautions in the small details such as ring gaps, timing, and even bearing clearances.


Thanks for the article!

Alexandre Ades
Alexandre Ades

Guilherme Gustavo da Silva, olhe esses numeros...

Mike Chandler
Mike Chandler

Zach Swa I could see you putting this in your suburban.

Jesus Bullet Raygoza
Jesus Bullet Raygoza

Yes it's very possible to make 1,200 hp out of a Honda engine 4banger dude. I've seen a k20 hit 950hp, single turbo set up.

Robert E Boggs
Robert E Boggs

They will be stock next year in all 1500's z-71's next production year.. they are also bolting the Allison tyranny onto it.

Doug Bridwell
Doug Bridwell

Just add BARDAHL less friction more powerless friction mmmmmmmmm

Burdett Lively
Burdett Lively

Twin turbo supercharhed? Carrol shellby did this with the big block cobra 850hp!

GMoney AllDay
GMoney AllDay

I need that done to my 06 silverado vortec 5.3 single cab short bed

Joe Bates
Joe Bates

You should drop that in my Silverado!

Tim Bill Harrison
Tim Bill Harrison

How's about in a 90 model silverado Christopher Edward Harrison

Alex Benwa
Alex Benwa

The one they copied from GM…...

Alex Benwa
Alex Benwa

2000hp.... Is that on a stock bottom end? I didn't think so.

Mike Bain
Mike Bain

Cool story, would love to have this setup in my truck.

chrisdau123
chrisdau123

It's all doable... as long as everything is tailored for what you want it to do, you can achieve the big numbers! A lot of guys don't realize that power isn't JUST in the displacement... that just makes it easier.