Choosing a BIG Cube BBC Street Engine
 

So I'm looking to buy a pump gas BIG Cube BBC for the street,how do I decide what to buy? Is there any advantage in a bigger bore or bigger stroke engine? Comparing bores and strokes is there a more efficient engine or easier one on parts compared to another? There are so many to choose from in the aftermarket world.

Hope this is right:
Size Bore Stroke Rod
540 4.50 4.25 6.385
555 4.56 4.25 6.385
565 4.60 4.25 6.385
572
582 4.60 4.375 6.535
598 4.60 4.50 6.535

I have old school thinking, if it doesnt need to be bored why do it.

One of my favorite combos is a 4.25 stroke with a 4.530 bore making a 548, or you could gi 4.375x.453 and make a 564 out of it. The stroke does help. I've seen both these combos work well. I also think using a longer rod instead of a shorter rod may help a little.

hammer, having a longer or shoter rod, does that determine the
placement of the wrist pin on the piston? or does the hieght of the
piston change? shorter piston longer rod, longer piston, shorter rod?
i have always been amazed on the 396 w/11 to 1 comp. using pump
gas due to a longer stroke, not sure on the rod or piston size,
but that combo worked well with power to boot :wink:

Wrist pin height change on the piston.

X2. A 548 is a simple and cheap big cube build. I had one and loved it. And it gives you plenty of rebuild room for years to come.

Providing your car is not a heavyweight, 540 to 580 inches in a street car will have the torque to get you up to the speed limit. I agree with Hammer and Rabbit, keep bore standard for cooling and future rebuild.
Hone and go. Why spend $$ to bore .030 to gain 7 or 8 inches? You cannot tell the difference on the street.
JMO Dave

Big cubes
 

I would leave the bore stock as long as possible . I'm a firm believer in boring only when necessary. When selecting a rod, I'd go with the longer rod to allow longer dwell at TDC of the ignition stroke. JMO.

If you order a Dart Big M block what is the bore size you get? Is it a 4.50 right off the bat,is that where they start?

4.500

something to think about if you go with longer stroke and have TQ monster HEALTHY 565-582 ci street motor..there is a chance your not gonna Enoy it too much cause its gonna blow the Tires off everytime you roll into the gas....i guess you can always put a 200 something gear in it that may help some of that.


i personally lean toward a little more Bore on a TRUE street engine..

just another way to look at things

I AGREE