big block 454 vs 427 - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

big block 454 vs 427

Reply
 
 
 
Thread Tools Search this Thread
Old 08-30-2009, 02:41 PM   #1
delgal
CF Senior Member
Thread Starter
 
delgal's Avatar
 
Member Since: Aug 2009
Location: marcinelle hainaut
Posts: 126
Thanks: 0
Thanked 0 Times in 0 Posts
Default big block 454 vs 427

hello,

which is the difference enters, L88 427ci - L71 427ci- LS5 - LS7 454ci,
(year 1969 - 1971) power, starting torke, reliability, lightness???

thank you with you all:chee rs:


david
delgal is offline   Reply With Quote
Old 08-30-2009, 03:46 PM   #2
TimAT
CF Senior Member
 
TimAT's Avatar
 
Member Since: Oct 2006
Location: Gladstone MO
Posts: 5,097
Thanked 16 Times in 16 Posts
Default

Factory horsepower ratings L-88 427 is 430HP, the L-71 427 is 435, and the LS-7 454 is 460. The 454 will have a bit more torque (longer stroke). The reliability and weight is close enough to the same on all 3 to not be a factor.
TimAT is offline   Reply With Quote
Old 08-31-2009, 03:33 AM   #3
OzzyTom
CF Senior Member
 
OzzyTom's Avatar
 
Member Since: Dec 2003
Location: Adelaide South Australia
Posts: 984
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by TimAT View Post
Factory horsepower ratings L-88 427 is 430HP, the L-71 427 is 435, and the LS-7 454 is 460. The 454 will have a bit more torque (longer stroke). The reliability and weight is close enough to the same on all 3 to not be a factor.

Seeing as the original poster is a newbie, it should be stated that the L88 was in reality much higher in horsepower... it was a high compression (12:1) racing engine with over 500 hp!!!
Not ideal for street use today due to lower octane fuels, but definitely much more powerful than the factory rating of 430hp!
OzzyTom is offline   Reply With Quote
Old 08-31-2009, 05:39 AM   #4
baxsom
CF Senior Member
 
Member Since: Jun 2008
Location: Rockledge FL
Posts: 4,408
Thanks: 0
Thanked 2 Times in 2 Posts
Default

dont forget that all pre72 rating were the one that was without accessories.
i think it was the gross reading, in 72 they switched to net which dropped the numbers but indicated a more real one. like the 71 454 vs 72 454. big rated numbers difference most of it was because of the scale.
baxsom is offline   Reply With Quote
Old 08-31-2009, 10:58 AM   #5
joewill
CF Senior Member
 
joewill's Avatar
 
Member Since: Sep 2007
Location: Noblesville Indiana
Posts: 3,114
Thanks: 0
Thanked 16 Times in 14 Posts
Default

people wil swear by the 427 and the way it revs due to shorter stroke.. but if all else is the same... then there is no replacement for displacement... the more displacement, the more torque.. especially at the lower end of the rpm range
joewill is offline   Reply With Quote
Old 08-31-2009, 03:05 PM   #6
FRSTR90
CF Senior Member
 
FRSTR90's Avatar
 
Member Since: Apr 2007
Location: Springfield Illinois
Posts: 1,893
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by baxsom View Post
dont forget that all pre72 rating were the one that was without accessories.
i think it was the gross reading, in 72 they switched to net which dropped the numbers but indicated a more real one. like the 71 454 vs 72 454. big rated numbers difference most of it was because of the scale.
It was all a game... Whether you take the numbers from 1970 or the numbers from 1973 in reality its all the same. Those factory ratings are just as irrelevant as the typical guy across your street with a 350 that has 500+ HP.
FRSTR90 is offline   Reply With Quote
Old 08-31-2009, 03:26 PM   #7
Jims66
CF Senior Member
 
Jims66's Avatar
 
Member Since: Apr 2008
Location: Lexington Park Maryland
Posts: 1,138
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Didn't the L88 have aluminum heads ?
Jims66 is offline   Reply With Quote
Old 08-31-2009, 05:11 PM   #8
MelWff
CF Senior Member
 
MelWff's Avatar
 
Member Since: May 2006
Location: Danbury CT
Posts: 7,376
Thanked 142 Times in 141 Posts
Default

Yes, the L88 had aluminum heads
MelWff is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • big block 454 vs 427
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    The N/A Corvette Fast List robz Drag Racing 225 11-30-2016 07:31 PM
    How to stroke a 427 Big Block? GŁnther-C3 C3 Tech/Performance 18 08-03-2016 06:40 PM
    ***LS3 427ci 08 Corvette Dyno Video*** Late Model Racecraft C6 Scan & Tune 2 08-22-2012 12:46 PM
    PLEASE HELP on LQ9 427ci ABVETTE86 C6 Tech/Performance 7 03-17-2012 06:21 PM
    l71 or l89 mdj89 C3 General 2 01-28-2009 12:27 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 02:10 AM.