LS1 or 383

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Apr 9, 2013 | 05:50 PM

#81

ezobens

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Joined: Aug 2005

Posts: 1,443

Likes: 65

From: Wauconda IL

Did you get a dyno sheet with this engine?
420 HP and 430 TQ seems pretty optimistic for the components listed.
Am I wrong?

Apr 9, 2013 | 05:57 PM

#82

pauldana

Race Director

Joined: May 2003

Posts: 10,956

Likes: 409

From: California

specs cut and copy:

CHEVY 383 420HP 430FTLBS STROKER ENGINE
Price: $2,495.00
Add to Cart:
Details:
CHEVY 383 420HP/430FTLBS STROKER ENGINE

THIS ENGINE HAS THE FOLLOWING:
Premium Seasoned 4-Bolt main block.
GM 350/3.750 con rods with NEW HP rod bolts and nuts.
NEW Lightweight 383 Steel Crankshaft.
NEW Hyperutectic Flat-Top Pistons 9.5:1 comp ratio.
NEW Plasma Moly Piston Rings.
NEW Speed Pro Camshaft & Lifters .480/.480 - 230/230 - 107 specs.
NEW Performance Gasket set.
NEW High Volume Oil Pump.
NEW HD Tri-Metal 780 "IROC" Series Rod,Main & Cam Bearings.
NEW Flex-Plate. GM Harmonic Balancer.
NEW HP Double "True Roller" Timing Set.
NEW Brass Freeze Plugs.
NEW Raptor Performance cylinder heads with Stainless Steel Swirl Polished 2.02/1.60 valves, Comp Series Springs .530 Lift, Bronze Valve Guides, Hardened Locks & Viton Seals.
NEW Head Bolts.
NEW Rockers.
MACHINE WORK

Bore and hone block with torque Plate with moly finish.
Deck cylinder block parallel to main line with CBN.
Re-size connecting rods with new bolts & nuts.
Hang and align pistons onto connecting rods.
Line hone main line.
Fully balance engine assembly.
Assemble.
ALL OF OUR ENGINES COME WITH A 7 YEAR / 70,000 MILE WARRANTY!!

Apr 9, 2013 | 06:02 PM

#83

Midnightoil13

Thread Starter

Intermediate

Joined: Sep 2012

Posts: 38

Likes: 0

From: Opelousas Louisiana

I wish. I doubt it was ever dyno'd. I was just about to cancel my order and get my money back when the engine finally showed up. So right now I'm just happy to have a running car for the summer. Live and learn sucks sometimes. Maybe I should go into hock up to my eyeballs and get the new stingray when it comes out.

Apr 9, 2013 | 06:13 PM

#84

fishslayer143

Drifting

Joined: Aug 2009

Posts: 1,346

Likes: 160

From: new iberia la

Quote:

Originally Posted by Midnightoil13

If anyone cares here's a link for the '82 vette specs http://corvetteactioncenter.com/spec...l#.UWSJpVcd9R8

the specs for the Crossfire are 200HP net.. your 420HP is gross, gives you about 370 HP net .. so it is almost double.. thats not a big cam, but your 82 has a small axle gear ratio .. if you want to wake it up , you ll need some 3.55 or 3.70 gears .. which will work just fine with your 700r4 trans

Apr 9, 2013 | 06:17 PM

#85

Midnightoil13

Thread Starter

Intermediate

Joined: Sep 2012

Posts: 38

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From: Opelousas Louisiana

I was thinking that might help / be the problem. Time to start saving again.

Apr 9, 2013 | 06:24 PM

#86

pauldana

Race Director

Joined: May 2003

Posts: 10,956

Likes: 409

From: California

9:1 compression, 480 lift 230dur.... what heads???

that will go flat at 4K rpm... maybe 45??....depending on the heads... what are the heads??? someone makes them...??

If it can make that tq... if... I would bet more like 400.... lets just say 400...for the following..

hp=(tq X rpm)/5252 (400 X 4500)/5252=343hp

lets do the 430 tq 430X4500 /5252=368hp.... hmmmm

lets say he keeps the tq to 5000

430X5000 /5252= 409hp

430X5200 /5252= 425hp

went to Camquest at comp cams, they have this cam #12-212-2 same specs, ran the app came back with tq at 392 and hp at 375..... I put in performance heads,

i dont know... but I do hope you get it... hp is fun:-)

Apr 9, 2013 | 07:51 PM

#87

ezobens

Drifting

Joined: Aug 2005

Posts: 1,443

Likes: 65

From: Wauconda IL

Quote:

Originally Posted by pauldana

OP's specs are similar but not the same-
He has cast iron GM heads and the cam specs are slightly different.

Probably a reliable motor but I think the HP/TQ specs are still optimistic...

Apr 9, 2013 | 09:01 PM

#88

holley505

Drifting

Joined: Nov 2004

Posts: 1,971

Likes: 7

From: Longwood Florida

My First swap was Rebuilt Factory motor... fresh rings bearing... mild port job on heads... upgraded cam... Edelbrock performer... blah blah... still ran lil hot and could NOT get out of the 14s

Second swap... 02 LS1 with 224 cam... RPM manifold and holley 680 AED DP Carb... MSD computer. I purchased the motor used for 1500 just longblock - it bolts to the fatory TH350 need custom motor mounts and new tranny custom mount... stuck with C5 manifolds at first. Car did 12.3 all day... ran nice and cool (no sweaty feet).

Added headers and changed heads... 12.0 all day.

Blew the motor...

in the garage (no rev limiter)

Purchased a LS3 bottom end built by TEXAS SPEED. used same CAT Heads and upgraded the VIC JR intake... same headers. BLEW THE TH350 so after... had to get a TH400

CAR Runs High 10s... on street tires (mickeys) with factory 3.36 rear gears... I have driven a 100+ miles on a road trip with a bunch of corvettes... never an issue. motor has been in the car almost 3 years now. about 8k miles... KICKS ***.

BTW that 383 does not have a Chance against a LSX - Welcome to the modern world with a CARB!

Last edited by holley505; Apr 9, 2013 at 09:05 PM.

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Apr 9, 2013 | 09:26 PM

#89

Midnightoil13

Thread Starter

Intermediate

Joined: Sep 2012

Posts: 38

Likes: 0

From: Opelousas Louisiana

So what is everyones recommendations for gear size and manufacturer?

Apr 9, 2013 | 09:49 PM

#90

cv67

Team Owner

Joined: Oct 2004

Posts: 81,241

Likes: 3,063

From: altered state

St. Jude Donor '05

Least a 3.73
230@050 cam shoud spin up hard to 5500 at least prob 6k
Wondering the if the heads/intake are holding it back. A good curve on the dist can do wonders. Car should move fairly well if all was right.
Dont need an LSx to go fast.

Apr 9, 2013 | 10:07 PM

#91

calwldlife

Team Owner

Joined: Jan 2007

Posts: 53,648

Likes: 878

From: Southern Cal Ca

St. Jude Donor '22

it is truely amazing how many different options there are.
LS, or standard block, so many things available.

hope you are satisfied which ever route you pick.