BLACK Z

The 85 and older stock replacment?

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

RB83L69

What do you mean when you say "redline"?

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"So many Mustangs, so little time..."
ICON Motorsports

Scrams84Z

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[This message has been edited by Scrams84Z (edited July 19, 2001).]

Scrams84Z

Not sure but doesn't it have a two bolt main and cast crank? I'm thinking that the factory recommended redline has to be around 5,250-5,500. My L82 with a forged crank and pistons, and 4 bolt mains red lines at 6,000.

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'84 Z28 w/ T-tops, 420HP Stroked 383, Trick Flow aluminum heads, Tremec 5 speed, 3.73 posi rear, Edelbrock 750 cfm carb, Dual Snorkel air cleaner w/ K&N filter, Edelbrock headers & 3" exhaust, Edelbrock Strut Tower Brace, Hotchkis LCA's and Panhard Rod, there is much suspension work to come.

1979 Corvette - Black/Black - 350 CI L82 w/ MM4 close ratio 4 speed manual

"Smoke 'em if you got 'em"

BLACK Z

It has 4 bolt main's, and what is the max rpm that this enigne ill go to? what is the max rpm that is safe?

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

Sitting Bull

Personally, I'd say be safe and shift at 5000rpm. Really high rpms, like 6500 or 7000, are better left for an engine that has the appropriate accompanying parts, like solid lifters (or equivelent) and very stiff valve springs.

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1986 Camaro Sports Coupe
T-tops, power hatch, third brake light
LG4 305 V8, "Damonized" Q-Jet 4bbl, K&N filter
Crane ignition kit, TH700R4 transmission and Derale cooler
Air conditioning, pw, pl, pb, ps, tilt wheel
Kenwood cassette, Pioneer 6x4 component front speakers
Rockford Fosgate 6x9 Punch rear speakers
Aluminum slots and Goodyear 225x60R15 Eagle HP tires

zippy

in stock form it's a 5k redline. since it has no power past 4500, i'd say it's not a bad thing. it's built to handle 6k if you were going to put parts on it to turn it that high, but that's not going to happen with the cam and heads that come on it.

BLACK Z

Because teh other day I had it to about 5,500 rpm, do Think that I did any damage? at what rpm do the vavles start to float? thanks

84TransAm

How many miles does it have on it? If you don't notice anything different (it could all be in your head) don't stress over it. I had my puny LG4 up to 6000+ rpms once (accident) and nothing bad happend except it didn't become any more powerful. That was 6 months ago, and it runs just dandy.

What did your 350 replace? If you had the LG4 or L69 how much stronger does it run?? Just curious because my Goodwrench 350 goes in on Monday.

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--Steve S--
1984 Trans Am 305 LG4, 5 speed Daily Driver, Flowmaster 80 Series
Holley 600 cfm & vacuum advance
350 ready to get in and run as soon as i find a WC T5.

[This message has been edited by 84TransAm (edited July 21, 2001).]

Mark A Shields

I have the same motor and the website that gives the specs of the motor have the redline at 5200 rpm's. Max hp is at 4500rpm and max torgue is at 3500 rpm.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

Mark A Shields

Sorry, max torque is at 3200 rpm's assuming you have the same setup as them, q-jet, cast iron intake, hei distributor and open exhaust.

five7kid

iTrader: (14)

There is a difference between the "power" redline and the "mechanical" redline. The former means where you should shift because the engine isn't going to make any more power, and the second is the point at which damage occurs.

Sounds like you're looking for the mechanical redline. I doubt 5500 did any damage, valve float would be the first thing to go wrong. If it didn't miss during this event, and it runs okay now, you're probably fine.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

breathment

wut exactly happends when a valve spring floats?

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88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass

BLACK Z

I replaced a lg4, The car runs fine, And I did not think I did any damage, i was just wondering for future refrence. The car runs alot strong with this motor then the lg4, It does not runas strong as it did with the summit 350 though.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

giovanhalen

valve float happens when the valvesprings aren't strong enough to keep the lifter riding solid on the camshaft and they will bounce. usually does no damage. it is possible for the valve to hit the piston. sometimes hydraulic lifters will pump-up and take up the slack when the lifter bounces off of the cam then the valve will not close and the engine will run real bad until the lifters bleed back down.

BLACK Z

I have heard that the vavle springs will loose there temper, and then you will be bascially running with no springs.

five7kid

iTrader: (14)

"Temper" is a process that follows heat treating or cold working, which are done for strength, to reduce the hardness (and strength) slightly but increase the toughness (reduce brittleness) significantly. To "lose temper", the material either has to be; a) heated above the tempering temperature (which would damage other engine parts long before that happened to the valve springs), or b) work hardened by being taken beyond the yield point - since springs are designed to go to coil bind without yield, that isn't likely either.

Things that do happen to springs are "creep" and "fatigue". Creep is due to being constantly loaded over time; it can be quantified by a load test and/or free height measurement, and is why it's a good idea to replace 20-year old valve springs. Fatigue is from repetitive loading below the yield point that causes slow fracture growth, and eventually leads to failure.

The phenomenom people are trying to describe is probably creep. It means, just replace old springs.

BLACK Z

Smokey yunik (spelling) said that when a motor goes in to vavle float that the springs will lose there temper,

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.