572 or 605?

i'm looken to go a little bigger and i know bigger is better but i have a nice bryant 4.250 crank i bought new and have in my engine now.i can go with a idt block and punch it to 4.625,use my crank & rod's=572.or buy another $$$$$ crank & rods 4.500 =605.how much would i be missen out on by going with the 572?let's say the heads would support the 605 very well also,what kinda difference in the peak hp/tq would it have and at what rpm?

i would keep the crank you have
and do the 572

i'm kinda thinken

if you have a nice crank so sense in buyin another one

jesse wrote:i would keep the crank you have
and do the 572

no no no!!!! get other crank rods pistons, and give me that junck crank you got in there now befor it falls out and makes a mess.. J/K

keep what you have now and get pistons IMO... BUT IF

would the 572 make as much power as a 605 at more rpm?

Lets' just say it will make 1.65 HP/Cubic Inch.

572 X 1.65= 943.8
605 X 1.65= 998.25

question would be if 55hp is worth the $ of another crank.

I'd use what you got in hand. If it don't make enough power then just spray the damn thing like Nick would ...........

personally I would use what you have allready it is payed for and it will build a bunch of power.....



Randy

Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

cool40 wrote:

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

I've got a new set of C heads, cnc ported by Charlie Evans, complete with rockers and titanium valves......

I got a new Eliminator Premier ... worked on by nobody

Nevs wrote:

cool40 wrote:

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

I've got a new set of C heads, cnc ported by Charlie Evans, complete with rockers and titanium valves......

how would your heads run on a 572 vs's a 605?

cool40 wrote:

Nevs wrote:

cool40 wrote:

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

I've got a new set of C heads, cnc ported by Charlie Evans, complete with rockers and titanium valves......

how would your heads run on a 572 vs's a 605?

On a 4.6250" bore, they will work real well. I'd be disappointed if they didn't make way over 1100 horsepower, I figured they would go 1175 in a 605" application. I'm sure Charlie could tell you better than I.

i'm thinken i'll use what i have and go 572.it'll make a lot of power and i have the crank & rods already.what kinda rpm would a 572 peak at with a good c head?

Depends on cam and induction but 7000-8000 isn't out of line.

cool40 wrote:

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

So would we all...like something better. How good are the A460 units and which castings? There are better A460 deals in most cases . You said you "can" go the elim. block for the 4.625" bore.........what do you have now?
Let's put some context to this....a 4.5" crank will be better than a 4.25"...depending on bore...what bore do you have now? What are the hp goals and budget? .......Then there can be answers.

Lem Evans wrote:

cool40 wrote:

Lem Evans wrote:Depends on the cyl. heads......which are? A 572" can make 1,000 + hp....one carb. and gas.

i have a460's but i'd like something better.

So would we all...like something better. How good are the A460 units and which castings? There are better A460 deals in most cases . You said you "can" go the elim. block for the 4.625" bore.........what do you have now?
Let's put some context to this....a 4.5" crank will be better than a 4.25"...depending on bore...what bore do you have now? What are the hp goals and budget? .......Then there can be answers.

i'll soon find out how "good" my a460's are when i get them off.they're the motorsport's from way back in the 80's,i did the port work,everhow it may be,the block i have is a .080 dove.i plan to have a idt block and wanted to know how much better a 605 would be than a 572.i'd like all the hp i can get and what's a budget?

Bigger engine w/o better heads/manifold.carb/cam may not be very productive.
You "plan" to have big $ block. I'd "plan" to to have better stuff......1st thing is.....find out how good the stuff you have is. I.M.O.

Lem Evans wrote:Bigger engine w/o better heads/manifold.carb/cam may not be very productive.
You "plan" to have big $ block. I'd "plan" to to have better stuff......1st thing is.....find out how good the stuff you have is. I.M.O.

i'll see what the a460's are when i get them off cuz like you said it's good to know.what do you think about the idt 903a plus cnc'd with 2.5/1.82......on a 572? thanks

cool40 wrote:what do you think about the idt 903a plus cnc'd with 2.5/1.82....

I think that is a very Large request! You are going to exceed the 4" rule, and make your valves kiss

4 inch rule , few heads break that from the start

My C's do, 4.330" combined.....2.450"X1.880".......