or would i be better off to buy a already balenced rotating assembly? my bugdit is 4000 dollars and i already have the bare block

 

If you want more bottom end
long tube headers with moderate diameter
dual plane intake
fast burn style heads
shorter duration cam with lower icl

 

Personally, Im not a fan of paying one of those big box companies to balance the rotator for a performance engine. You have no real way of checking it without taking it and having it spun anyway, so whats the point. And what is "balanced" to them? 2 grams, a gram, half a gram? For me, I'd rather have it done by someone I know does the job properly. Just my .02; your mileage may vary.

 

Beginning your build with a $2000 crank will make quick work of your budget and leave you hanging. With a bore of 4.155" and a stroke of 3.480", your build will be 377 cubic inches. How did you arrive at the conclusion that this combo will give you max torque? (Look closely, the crank you linked has a 3.480" stroke that is the stock 350 stroke).

A Scat cast steel, 3.750" stroke crank together with a 4.155" bore will make a 406 for a lot cheaper. David Vizard has used these cranks to make 550 hp small blocks for several years now and has never experienced a failure.

Here's the external balance model.....

http://www.summitracing.com/parts/sca-940050/overview/make/chevrolet

And here's the internal balance model.....

http://www.summitracing.com/parts/sca-940056/overview/make/chevrolet

 

How can i identify a crank? i got a number 070627 off the crank at the back of crank but i cant find anything on it

 

All SBC crankshafts have a casting number located on one of the rough finished throws or counterweights towards the front of the crank.

 

Would the crank have to be out of the engine to see these number?

 

And i was told by the guy i got it from its a scat crank the only number i can see with it in the block is 070627 and thats on the last counter weight towards the back on the horizontal side of the counter weight

 

That number sounds like it has ben balanced at a machine shop, most stamp the number so if something happens they can go back to that file # and make a matching piston and rod combo without havind to do a complete set or tearing down engine and rebalancing complete engine assembly again ,,cost effective, yours should have a number like 3951529 ,check parting seam to tell if it is cast or forged,

The 509 and 511 blocks are good blocks ,never go over .030 for performance use ,try to find a block without center freeze plug ,MUCH stronger ,..Blazer or 4wd truck normally.

 

okay I've spent the last 3 hours researching everything i already have I have h616p pistons forged crank internally ballenced and 74 cc world cast iron heads can i still use these pistons and make 550 hp with different heads? if so what would be a good head and cam set up?

 

and if i have a center frost plug would that mean theres 3 on each side? i only have 2 on each side one toward the front and one toward the back

 

2 on each side .you have the Good one:thumbup::thumbup: no plug under motor mount.