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GM's crate LS427/570 7.0L 570HP engine

General engine tech -- Drag Racing to Circle Track

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bigmike
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GM's crate LS427/570 7.0L 570HP engine

Post by bigmike »

GM's crate LS427/570 7.0L 570HP engine. Thinking about a some more horsepower for my C6 corvette. Anyone tried one of these out yet?

TECH SPECS
Part Number: 19420191
Engine Type: LS-Series Small-Block V-8
Displacement (cu in): 427 (7.0L)
Bore x Stroke (in): 4.125 x 4.000 (101.6 x 92 mm)
Block (P/N 12602689): Cast aluminum block with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12611649): Forged steel
Connecting Rods (P/N 12661677): Forged titanium
Pistons: Hypereutectic aluminum
Camshaft Type (P/N 19419859): Hydraulic roller
Valve Lift (in): .591 intake/.590 exhaust
Camshaft Duration (@.050 in): 227º intake / 242º exhaust
Camshaft Lobe Separation Angle: 116º
Cylinder Heads: CNC-ported LS7-style ports with 70cc combustion chambers
Valve Size (in): 2.200 titanium intake, 1.610 sodium filled exhaust
Compression Ratio: 11.0:1
Rocker Arms: Investment-cast, roller bearing trunnion
Rocker Arm Ratio: 1.8:1 (offset intake)
Recommended Fuel: Premium pump
Maximum Recommended RPM: 7,000 rpm
Balanced: Internal

https://www.gmperformancemotor.com/parts/19420191.html
F-BIRD'88
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by F-BIRD'88 »

Camaro oil pan and exhaust manifolds may not fit corvette chassis..
Power may have been tested using headers not Exhaust manifolds.
Roundybout
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by Roundybout »

C6 has the 505HP LS7, correct? That’s an awful lot of money for a cam change and a downgrade from the dry sump setup. You’d be miles ahead modifying what you have for that coin.
mt-engines
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by mt-engines »

Roundybout wrote: Fri Oct 09, 2020 11:00 pm C6 has the 505HP LS7, correct? That’s an awful lot of money for a cam change and a downgrade from the dry sump setup. You’d be miles ahead modifying what you have for that coin.
or and ls2 or ls3.

if its an ls3 just stick a cam in it

or stroke it to a 408

depending on what year c6 it is it could have a 58x or 24x reluctor. that could be a problem there with the swap.
bigmike
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by bigmike »

Mine is the 07 with a LS2 and has the 58x reluctor. What I want to avoid is having it in pieces for 2 or 3 months plus, hence using a crate engine. I got a quote from a local engine builder that wanted a couple thousand plus more for a LS3 style stroker 408. It would have more power but not sure I need more than this crate engine would have.
Sparksalot
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by Sparksalot »

Can't answer the question directly but have seat time in a 2006 C6 Z06 equipped with a similar LS7 engine as well as a LS2 equipped C6 with a positive displacement supercharger. The LS7 in the C6 was dry sump and I don't think that crate engine will fit your C6 without more expensive parts than come with that crate engine.

For street duty I prefer the far cheaper blown LS2. You don't have to twist it to high revs for real performance and believe me, performance is there in abundance.

There are several manufacturers of blowers for your car. Edelbrock, Whipple and Magnuson come to mind. Check them out.

You could put a fresh rebuilt LS2 and blower in your Vette for much less cost than that crate engine. And, it would be far less hassle! Driving fun guaranteed.

If you want to do track time or race, my advice would be completely different.
mt-engines
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by mt-engines »

You could do a Vortech V-7 YSi, headers and a 230@.050 112 lsa and make 740 whp on 10psi.

that exact same setup on an ls3 vette made 820whp when i let out@7700rpm power kept climbing, and that was only around 12lbs of boost also

or make 580whp with the edelbrock e-force, and a smaller upper pulley, i want to say that was around 12lbs.

I have done quite a few Corvettes. Most always wanted more after the cam, then stroker, then supercharger.. i can say even with just the edelbrock eforce, i dont reccomend holding the traction control button for 5 seconds if its cold or damp out. you will just light the tires up any speed below around 80mph

heres a link to the LS2 with E-Force:
https://youtu.be/pSg-V4In864
F-BIRD'88
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Re: GM's crate LS427/570 7.0L 570HP engine

Post by F-BIRD'88 »

I would verify the oil pan and ex manifolds before buying.
The fuel system on your car may need a re-do also.
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