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The Joy Of Big Block Power

Joined
Mar 9, 2009
Messages
1,026
Location
Yemen
I had played with my '82 for many years; finally ending up with a set of 3.55's, a roller cam, Dart heads, and a Renegade intake. It'll run mid 90's in a quarter mile but after I bought my 454" powered '71 in 2009 and worked it over it runs 105+ mph quarter miles with it's A/C on! What a difference another 100 cubic inches make but it handles like a Greyhound bus. With the additional 250 pounds in the front it plows into corners but the ride is as smooth as a much heavier passenger car. And with it's lower seats and narrower transmission tunnel it has a lot more interior room. I modified it's L-88 style hood last summer for ram air and I immediately gained an additional 3-1/2 mpg; going from 10-1/2 to 14 mpg in my everyday 45-55 mph driving. I'm hoping to go to the coast sometime this summer and I think it'll get 16 mpg at a higher cruising speed.

Do any of you have big block power?
 

Mac

Well-known member
Administrator
Joined
Feb 13, 2003
Messages
5,476
Location
Ottawa, Canuckistan
Corvette
1973 coupe L82 (gone as casualty of divorce)
I wish!!

My friend, 67HEAVEN, is an original owner of his 1967 BB coupe. I've driven it since he restored it with a 502 BB and 5 speed and WOW isn't a big enough word.
:w

Mac
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
My 71 has a modified 460-in BBC, with cast iron heads and an 850 Holley, to the tune of about 530-hp. With that engine, a six-speed and a 3.08 axle, the best mileage I've ever seen was just a hair under 17-mpg at speeds of 60-65 mph.

Right now the car sits in the shop with some broken lifters. The motor is pretty tired having been built in the mid-90s and been beat like a rented mule.

It's needs to come out, have the short block freshened with new bearings and new pistons. Then I'm goning to install a more modern roller cam profile and modern aluminum heads.
 
Joined
Mar 9, 2009
Messages
1,026
Location
Yemen
My 71 has a modified 460-in BBC, with cast iron heads and an 850 Holley, to the tune of about 530-hp. With that engine, a six-speed and a 3.08 axle, the best mileage I've ever seen was just a hair under 17-mpg at speeds of 60-65 mph.

Right now the car sits in the shop with some broken lifters. The motor is pretty tired having been built in the mid-90s and been beat like a rented mule.

It's needs to come out, have the short block freshened with new bearings and new pistons. Then I'm goning to install a more modern roller cam profile and modern aluminum heads.


My '82 with it's beefed 350" will run 6 second flat 0-60's but my '71 with it's beefed 454" can only manage 10 second 0-60's because of severe wheel spin. But once it hooks up it really hauls the mail; actually burning off about 25 to 30 feet of rubber when it hits 3rd gear at 60 mph. But as I said before it handles like a Greyhound bus because of the additional 250 pounds of weight in the front end. With it's 460 lb/ft of torque it is a blast to drive.
 

kpic

Well-known member
Joined
Mar 29, 2014
Messages
2,292
Location
Columbus, NC/NE Georgia
Corvette
1997 boosted silver coupe
I did my best to celebrate diversity. :D 427 and a 388"-350 back when gas was cheap. Currently it is an LSx blower with over 600 RWHP. Roll racing, it has run away from an 11.1-11.2 car. Highway MPG is over 30 at 70 in 6th. What is not to like? ;)
 

Stingray540i

New member
Joined
Apr 15, 2016
Messages
1
Location
Wilmington NC
Corvette
74 Roma Red Coupe
my 74 has a ZZ502-502 backed with a 700R4 with a TCI constant pressure valve body and 5 pinion planetary gears and Beast sunshell gear and a 4:56 rear gear
 
Joined
Mar 9, 2009
Messages
1,026
Location
Yemen
The very first thing I noticed with my 454" powered '71 was the awesome pulling power in high gear. It accelerates in 4th gear like a small block accelerates in 3rd gear.
 

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