Small Block & Big Block Chevy Specific - how big for the street?

Hey guys, anybody running big cubes on the streets these days, just seeing what is out there...

I have a 632 in the works
Donavon Aluminum block
Callies 4.75 crankshaft
eagle 6.7 rods
Je Custom 10.5 compression pistons(pump gas motor)
Brodix Big Brodie heads(done by Reher/Morrison)
Dart intake
Comp solid roller(it's big) thats all I can tell you.
backed by a Turbo 400 with a brake

Should get about 5-7 mpg, not a economy car thats for sure

What did that donovan run you $$$$?

What did that donovan run you $$$$?

$2000 used, came with 2 new sleeves that I had to install

That's definitely big. I'm going to be running a 555 in my T/A.

540 going to 565 next rebuild. Rarely street driven these days, no more than a few laps around the block the last few years, just so it's considered "street driven". Engine size has nothing to do with streetability anyway, it's camshaft size and how long will the lifters and springs last.

WOW bro let me know if you see another aluminum block for that price used ill grab it asap

holy hell, that sounds like a badass setup :thumb:

p.s., what color is your 67, just wondering if i have seen it around town

Sounds sick, I you sure you don't mean 5-7 gallons to the mile??? :D


As long as you have a good top notch aftermarket cooling system you should be ok. My 468 stays cool all day long with two sets of fans and a belt driven water pump. One of the fans is attached the the water pump (ditching that soon for an electric water pump).

As stated above more of the issue is cam size and valvetrain

Well You Can Go As Big As You Want Aslong As It Lasts

WOW bro let me know if you see another aluminum block for that price used ill grab it asap

I got lucky on the block, most likely will not c another like that, unless it has been destroyed.

Sounds sick, I you sure you don't mean 5-7 gallons to the mile??? :D


As long as you have a good top notch aftermarket cooling system you should be ok. My 468 stays cool all day long with two sets of fans and a belt driven water pump. One of the fans is attached the the water pump (ditching that soon for an electric water pump).

As stated above more of the issue is cam size and valvetrain

It will be stay cool, already have the radiator and fans to go with it, no problem on that...been dealing with big blocks for 20 years know, never hade 1 overheat. As for the valve train, it will be fine, just have to adjust them every now and then

HMMM I have allways been told the larger CUI you go the harder it is to keep cool. IE 5XX and up.

HMMM I have allways been told the larger CUI you go the harder it is to keep cool. IE 5XX and up.


Wouldnt that depend on the car? And what your doing with that motor?

Wouldnt that depend on the car? And what your doing with that motor?


Yes, but I doubt someone building a 6XX motor is building something mild :D

HMMM I have allways been told the larger CUI you go the harder it is to keep cool. IE 5XX and up.

Just went from a 598 in a street car for 3 years with no problems, to a 615 in a buddy of mines car....depends on how its built and who built it, it will be fine

Im sure it will be fine, was just curious :)

Im sure it will be fine, was just curious :)

It will be kinda mild, most people don't know that more cubes, eat up the agressiveness of a pretty good size cam and calms it down some.

Sounds like a carzy 1st gen :drive:

I do know of one other 632" streetcar a 67 Vette. He posts on Corvette and sometimes Team Chevelle.

http://forums.corvetteforum.com/showthread.php?t=1728758

It will be kinda mild, most people don't know that more cubes, eat up the agressiveness of a pretty good size cam and calms it down some.


Thats true, the more CUI the smaller the cam is in the motor. As in a BIG cam gets smaller with the more CUI the engine gets.

For a 350 a .650 lift cam might be considerd big but for like a 408 its just right.

Its all relative.

I am planning a 572 crate with a cam swap for my 1969 Impala backed by a th350. looking for around 600 rwhp in the street car. It was my first car and a gift from my great grandmother.. I am rebuilding the car in her memory. She bought it brand new in 1969 (paid cash) 327/pwerglide 2 door vinyl hardtop. :)

Hey to the op let me know what kind of numbers you put down as i am doing a very similar set up in my 70 nova this winter im interested i would really like to break the 1000hp mark on 93 octane with no power adder but im having trouble finding people who have done it......

Hey to the op let me know what kind of numbers you put down as i am doing a very similar set up in my 70 nova this winter im interested i would really like to break the 1000hp mark on 93 octane with no power adder but im having trouble finding people who have done it......


It will be tough for 1000hp, on pump gas. We just dynoed my buddies 615 and it made 853hp with 1 carb. The 632 should be around 860-870hp or so on 1 carb, but that is plenty to drive around with, anymore I would need to raise the compression and change the heads, and I just don't want to do that...remember street car on pump gas....

It will be kinda mild, most people don't know that more cubes, eat up the agressiveness of a pretty good size cam and calms it down some.Just as hard on the springs and lifters though. Just curious, what kind of lift are you going to run?

I'd like to do some more street driving, but right now I have .748 lift camshaft, I just don't know how long springs and lifters will last and I like racing a lot more than working on it. I'm thinking about when I rebuild it to go to a bigger diameter camshaft with roller bearing and bigger diameter lifters. Maybe even titanium valves to take some weight out of the valve train. It seems valve springs keep getting better, just not sure what brand to use anymore. I've used K-motion for years, I know there's a lot better out there these days. I've never really talked to anyone that has drove big camshafts on the street for very long.

Hey as far as cubic inches go on the street .... here's my brother in laws STREET DRIVEN Chevelle which is for sale..... ebay item number 200127285983

565 pump gas BBC ...