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Crate 454 RPM

D

DR.G

Guest
Hey everyone, I have been lurking around this site for a few months and I thought I would introduce myself and my car. My name is Dave and I have a 72 Red LS5, that has a mostly stock GM crate 454 Gen VI and I was wondering what kind RPM's are those with Big Blocks maxing out at? I have MSD ignition box 6AL and a MSD dist. my box pill is a 5600rpm and I am thinking about switching to a 6000. My car is a 4spd car with 308 gears in the rear end. Here is a pic, I hope this works.
Dave

100_0235.jpg
 

minifridge1138

Well-known member
Joined
Feb 2, 2007
Messages
908
Location
USA
Corvette
1982 Black Fastback
Hello Dave,

Welcome to Corvette Action Center. I love the paint job and the chrome bumpers. I don't know the correct rpm for a big block (my car only has a small block). But don't worry, I'm sure someone that knows will reply soon.

Good Luck, Happy driving, and feel free to ask every question you think of!
 

Koop

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Joined
Mar 16, 2005
Messages
545
Location
Kalifornia
Corvette
YELLOW 69 modified GM Crate ZZ383, LS2 TBSS
Nice head lights and hood!
 
D

DR.G

Guest
Thanks, I also like the chrome bumpers. They are getting harder to find these days.:v
 

Glensgages

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Joined
Jan 10, 2003
Messages
757
Location
State-of-Confusion
Corvette
Black '82 Coupe
both the 454/HO (part-number 12498778 ) and the ZZ454 (PN 12498777 ) are listed showing a maximum RPM of 5500, with each motor maxing-out HP @ 5250 RPM
 
T

TMPJoe

Guest
both the 454/HO (part-number 12498778 ) and the ZZ454 (PN 12498777 ) are listed showing a maximum RPM of 5500, with each motor maxing-out HP @ 5250 RPM

I would not rev that to 5500 repeatedly either... what is the tranny set up?

don't rev that motor high ... the 5600 is the rev limiter so I would see if they have a 5400 and use that ... no reason to rev any higher ....

I can't remember if they go in 200 increments... anyone?

PS Nice color!
 

Glensgages

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Joined
Jan 10, 2003
Messages
757
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Black '82 Coupe
... the 5600 is the rev limiter so I would see if they have a 5400 and use that ... no reason to rev any higher ....

I can't remember if they go in 200 increments... anyone?
I know that AUTOMETER Shift-Lights come with 'pills', or 'chips', that are in 200-RPM increments:
I saw a guy drag-racing a stock ZZ502 (GM-suggested max RPM of 5800 ) in a mid-'70s Corvette with 3.90-gears & 29"-tall slicks, 'on-sale'headers & side-pipes, running 12-ohs @ 112 MPH, with his shift-light set at 5400 RPM, and a trap-speed of 5600 RPM, but he claimed she was outta-steam the last few hundred feet (open-headers may've helped ), and it may've gone-quicker with 3.73-gears.
 
T

TMPJoe

Guest
Glen.. not always the rear.. I run a 3.73 in mine .... I am right on the money when I hit the traps... would not go any deeper... I run a custom built stroker... it will handle 6000+- 200 but I don't do that ...

3.73 gears seem to work really well in the big block vette given the weight we carry if the car is a street machine with "stock" suspension and "frame".... I would recommend that to anyone as a good gear for motors pushing max HP at 5000-5500 RPM...

again though... others have different ideas.. always good to get other opinions....

but pushing high rpms on a crate big block will be a disaster eventually.. they just won't do that....
 

Glensgages

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Joined
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Messages
757
Location
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Black '82 Coupe
Glen.. not always the rear.. I run a 3.73 in mine .... I am right on the money when I hit the traps... would not go any deeper... I run a custom built stroker... it will handle 6000+- 200 but I don't do that ...

3.73 gears seem to work really well in the big block vette given the weight we carry if the car is a street machine with "stock" suspension and "frame".... I would recommend that to anyone as a good gear for motors pushing max HP at 5000-5500 RPM...

again though... others have different ideas.. always good to get other opinions....

but pushing high rpms on a crate big block will be a disaster eventually.. they just won't do that....
:upthumbs

In the next year-or-so, I hope to put a solid-axle into the back of my '82, replace the wimpy 700R4 with a built THM400, and do some bracket-racing with the car, and my thinking was split between building the 26,000-mile L-83 short-block, a stock ZZ383, or a stock ZZ502, and be content running 12s, possibly 11s:
I just started-up a small business, and need to keep some cash on-hand, so I'll be using the blck/crank/rods/pistons from the Cross-Fire, and adding heads, cam, intake, carb, etc.


I believe if I'd have chosen a ZZ502, shifted and trapped @ about 5200 RPM with 30" slicks and 3.73s (almost 114 MPH? ), I coulda run 11s with ease, and the motor woulda out-lived me!!!!!
 
T

TMPJoe

Guest
I run a custom built turbo 350.... custom ATI converter... (its 8.5 inches talk about headache trying to go 70 on the highway!).... I would love to add a gear vendor unit to it for cruising....

I don't drag this car.. at the track with the gooyear stock 60 series tires it went a 12.37 due to wheel spin(had a 1.98 60 foot!!!!!!!!)... had to leave at 2000rpm and then it was sideways to 300 feet!.... ran a best of 118 though so it should be well into the 11's on pump gas... I can run a 200 shot... but again... why? I just like the way the car came out.. did a lot to the suspension ..... that was key... much nicer than it was when i brought it home from the dealer 27 years ago!

my race friends help me just a ton.. the cam is custom.. heads also... started out as sportsmen irons.... helps with heat when running high compression on crap gas!
 

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