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-   -   Which stroked BBC? (http://www.hotrodders.com/forum/stroked-bbc-182208.html)

ribmaster 08-04-2010 09:49 PM

Which stroked BBC?
 
Will a bbc 496 stroker with 10 57 to 1 cp make a big diffrence than a 460 bbc same cp? Reason I ask is the rods and crank cost the same . Which I allreay got but I can return them and get the stroker kit and I would only have to buy the pistons which would cost me somewhere around 600 bucks would it be a noticable diff in hp and torque?

ericnova72 08-04-2010 10:02 PM

Overly simple answer is yes, all things being equal, 36 more cubes should almost automatically get you at least 36hp, and more like 45-60hp if this is a performance build. Just make sure you have heads big enough to feed it, 90% of stock heads are not going to be big enough. Large Oval ports will need a lot of port work and bigger valves, or use Rectangular port heads on an engine this big. GM uses Rectangle ports on the hottter 502's that they offer.

ribmaster 08-04-2010 10:07 PM

Useing afr 325 cc intake runners 115 cc chambers..will the cp being what it is matter with it being a stroker I can still run pump gass and have nore hp just making it a stroker vs just an over bore?

ericnova72 08-04-2010 10:21 PM

Being a stroker doesn't change the octane requirements as long as the comp ratio is kept the same, at 10.5-ish and aluminum heads with a good chamber shape the AFR heads have it should be fine. The added cubes of the stroker is what makes the additional power. Cubic inches are always king, most serious BBC racers are using 540 or bigger, with up to 632 being pretty common now days for that very reason.

ribmaster 08-04-2010 10:28 PM

Will cam selection change any? can I keep the 243 249 630 full rollar

ericnova72 08-04-2010 10:32 PM

Quote:

Originally Posted by ribmaster
Will cam selection change any? can I keep the 243 249 630 full rollar

You haven't given much to go on as far as rpm range you expect, or how you intend to use the engine. Need more info on the vehicle.

ribmaster 08-04-2010 10:37 PM

Street and strip kinda like a fish and ski boat lol that's why I wanna keep the cp down. The cam range is from 2800 to 6800 .just wondered if the stroker would give it more low end torque since my intake runners are big and ill lose some bottom end

ericnova72 08-04-2010 11:02 PM

Quote:

Originally Posted by ribmaster
Street and strip kinda like a fish and ski boat lol that's why I wanna keep the cp down. The cam range is from 2800 to 6800 .just wondered if the stroker would give it more low end torque since my intake runners are big and ill lose some bottom end

Yes, the stroker will give more low end torque. In the end it is all a cubic inches game, an overbore doesn't add many cubes so it doesn't add much hp. A stroker crank adds many more cubes, so it adds more power.

Cam doesn't sound like a bad choice, rpm range will be a little lower due to increased cubes, like 2500-6500 rpm.

ribmaster 08-04-2010 11:28 PM

Do u happen to know the bore on the 496 stroker I'm allready 30 over . I might not be able to do a 496

techinspector1 08-04-2010 11:44 PM

Quote:

Originally Posted by ribmaster
Do u happen to know the bore on the 496 stroker I'm allready 30 over . I might not be able to do a 496

+0.060" with a 4.250" crank makes a 496.
I haven't yet seen a BBC that wouldn't take a +0.100" bore. (4.350" bore with a 4.250" crank makes a 505.)

ericnova72 08-05-2010 01:35 AM

At .030" overbore it makes a 489 with the 4.25" stroker crank. If bore is fine at .030 then use it, no sense boring more than you have to.

cobalt327 08-05-2010 05:28 AM

Eric (or anyone w/an answer), I know honing isn't boring, but what's your thoughts on torque plate honing a worn 0.030" over BBC cylinder to 0.040"?

I realize the usual amount to be honed is much less than that, and also I'm thinking the hone wouldn't be capable of removing taper that might be present in a worn cylinder, but then I'm not a machinist.

Doable or not advisable, or?

What is the smallest practical amount that can be bored?

ribmaster 08-05-2010 04:16 PM

i double checked and the pistons r a .60 overbore vs the 30. i would rather have a fresh bore and the machine shop said it would be close with all the test he done on the rings and such i dont know what all they do. i just know i would rather have new pistons and rings than something thats allready got wear on it.

ribmaster 08-05-2010 04:19 PM

only cost me 572 dollars more to get the rings so i figure why not. now im worried bout the cam again :smash:

ribmaster 08-05-2010 09:57 PM

Quote:

Originally Posted by ericnova72
You haven't given much to go on as far as rpm range you expect, or how you intend to use the engine. Need more info on the vehicle.

http://www.google.com/gwt/x/i?wsc=yq...p=012a457a658e. This is the cam size I chose originally before I decided to stroke it. Got some good infor from tech on here .just wondering now that the stroker will give me more bottom end torque if I should go up on cam size for more midrange and top end? Thanks for any suggestions would I need a little more duration than what this cam offers?


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