383 LS dyno test

[awbrown]

Finished a 383 LS series engine last week and dynoed it .. The customer wanted 500hp ,which is really plenty for the street being that the customer has never had more than 300hp..

Here is how the build was..
GM #243 heads cnc ported from Wegner automotive (nascar west series motor)
11.3 comp.. Diamond Flat top pistons
224@.050 intake 234 @ .050 exhaust .588 lift straight accross
Scat 4" stroke crank
Scat 6.125 H beam rods
stock 5.7 aluminum block
stock LS6 intake
stock throttle body
accell injectors
stock rockers
beahive springs

516hp @6000 503 ftlbs torque...

It was pulling 1.0 vaccum on the top end so it could use a bigger intake / throttle body and pick up some more....

[ChrisDollins]

Where's the video??? Lol. Sounds like a good setup.

Chris

[awbrown]

I wish , I may be able to post the dyno sheets , though I already delivered it to the customer....

[gearheads78]

Looks like a great combo. I would suggest at least sending the rockers to Harland Sharp for a bearing conversion they offer. You are begging for a stock rocker failure at your HP level. His truck should fly. My old 347ls motor made 408 to the tires with an unlocked 4000 stall and was good for 11.0's in a 3600 lb car on drag radials







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[chevyrestoguy]

LS engines are incredible. I've played with Chevy engines for decades, and I have never seen an engine like the LS that can make major horsepower gains with very simple bolt-ons and mostly stock parts. The team that engineered that engine definitely did their homework.

There's definitely more left in that 383. Change the intake, bigger throttle body, and a cam change will get even more horsepower. That 383 is a great example of what I was talking about above. That would be a fun engine in a street car.

[lucifer]

For sure the LS series engines rock. I dynoed a stock out of the crate LS3 with stock exhaust and air box.
This thing made 464 hp right out of the box and it was under 7K to buy.

Nice stuff!!

regards

[rideblue00]

shooo, 7k is alot. Although my 350 cost 3500. and i only got 300hp.

[Scot_Douglas]

Sweet!

[awbrown]

Originally Posted by gearheads78

Looks like a great combo. I would suggest at least sending the rockers to Harland Sharp for a bearing conversion they offer. You are begging for a stock rocker failure at your HP level. His truck should fly. My old 347ls motor made 408 to the tires with an unlocked 4000 stall and was good for 11.0's in a 3600 lb car on drag radials
i

Actually I think they aready had that , they came with the heads from Wegner .......

[awbrown]

Originally Posted by lucifer

For sure the LS series engines rock. I dynoed a stock out of the crate LS3 with stock exhaust and air box.
This thing made 464 hp right out of the box and it was under 7K to buy.

Nice stuff!!

regards

The customer had the block ,cam ,lifters ,intake oilpan,and injectors. I supplied the rotating assembly ,heads, gaskets coil packs ,bolts, pushrods,and rockers.. Machine work and assembly it all came up to 5570.00 plus 660 for dyno time plus oil ,plugs and gas..

[pharmd]

What intake/TB are they running? I'd ditch the HS rockers period...too many horror stories with those, and modding them just means you have more money in a rocker with a poor reputation. stock rockers do a pretty good job actually, if you want rollers, then I think most folks are just doing the comp trunion upgrade on the stockers...Yella Terra would be my preference for an affordable standard roller.

[OJ1988]

Originally Posted by pharmd

What intake/TB are they running? I'd ditch the HS rockers period...too many horror stories with those, and modding them just means you have more money in a rocker with a poor reputation. stock rockers do a pretty good job actually, if you want rollers, then I think most folks are just doing the comp trunion upgrade on the stockers...Yella Terra would be my preference for an affordable standard roller.

First post said stock LS6 intake
stock throttle body
stock rockers.