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Camaro Z/28 Forum - Z/28 Specific Topics Discussions related to the 5th gen Camaro Z/28 model

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Old 10-01-2012, 05:02 PM   #251
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Quote:
Originally Posted by shaffe View Post
Dumb question possibly, someone please correct me if I am wrong.

I see here that even though engines were identical( in the 70 -74 cars), the Vette was rated higher. IIRC wasn't the highest rated ( or advertised HP) corvette 435HP

So if the Corvette had to have the highest HP how did the 70 Chevelle get away with its advertised 450HP in the LS6 454
Apples 'n oranges...

The 435hp L71 427 '67-'69 Corvette was the "highest Factory-RATED" Corvette...but NOT the most powerful. "Ratings" and "actual" didn't always correlate. The L-88 and ZL-1 Corvettes were rated 430 hp...at something like 5200 rpm, well below their 6000+ power peak. And the L71 (also available with aluminum heads as option L89 in '69) was a Corvette-only option.

The '70 LS6 454-450hp engine offered in the Malibu was NOT offered in the Corvette.

The LS6 454-425hp Corvette engine of 1971 was essentially a lower compression L-88 with 27 more cubes.

In early '70 literature, mention was made of an LS7 Corvette engine, a 454" version of the high-comp L-88 rated at 460hp, but emissions issues meant it never made production...

http://oldcarbrochures.org/index.php...vette-R1-06-07

Last edited by LOWDOWN; 10-01-2012 at 05:31 PM.
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Old 10-02-2012, 11:24 AM   #252
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So basically they "got away" with it bc that engine was not offered in the Vette. Got it.

The L-88 Corvette actually made something like 560HP didnt it?
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Old 10-02-2012, 01:15 PM   #253
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I don't think anyone "got away" with anything. By MY 1970, the mid-size edict of "no more than 400 c.i." was gone. Chev = 454, Pontiac/Buick/Olds = 455. Of those, clearly the Buick Stage 1 benefitted the most from its very conservative 360 hp rating (after all, it made 510 torque!), as they have been known to trounce Street Hemis...

A Corvette BIG Block came with 2.5" exhaust, run through full duals, with only a 98" wheelbase...not a lot of exhaust, there, compared to a Camaro (transverse muffler) or Malibu (112" w/b). If the Vette had side exhaust, even less loss... Also, for insurance and NHRA Class purposes, some engines were rated perhaps a tad lower than "actual output". Slap on some equal-length headers with open exhaust and watch some numbers soar!

L-88/ZL-1 power: See the Bill Porterfield sidebar, here...and remember, these are engine dyno numbers...

http://www.camaros.org/copo.shtml#engine

This particular L-88 was once owned by a friend of mine. The copy will clarify my previous post:

http://corvettes-musclecars.com/gall...P+Convertible/

Last edited by LOWDOWN; 10-02-2012 at 01:32 PM.
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Old 10-02-2012, 02:36 PM   #254
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Thanks for the info!
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