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Old 08-30-2009, 02:41 PM   #1
delgal
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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:


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Old 08-30-2009, 03:46 PM   #2
TimAT
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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.
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Old 08-31-2009, 03:33 AM   #3
OzzyTom
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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!
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Old 08-31-2009, 05:39 AM   #4
baxsom
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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.
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Old 08-31-2009, 10:58 AM   #5
joewill
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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
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Old 08-31-2009, 03:05 PM   #6
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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.
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Old 08-31-2009, 03:26 PM   #7
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Didn't the L88 have aluminum heads ?
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Old 08-31-2009, 05:11 PM   #8
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Yes, the L88 had aluminum heads
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Old 08-31-2009, 05:11 PM
 
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