Ratchet

Cool..Like I said, just wondering..................

I'd like to build a set of naturally aspirated 565's (in the future) to replace my 355's in my 31 scarab. Have all of the ones you've done been NA ?

Sean

1800runsnew.com

prolly the best way to do it!

bobby daniels

NOPE BLOWERS ,ITS THE WAY TO GO IN THE RPMS WE RUN 6K AND LESS AND NOT BEAT THE MOTOR TO DEATH BEING NA !
SORRY IF I POSTED WRONG OR NOT CLEARLY ,BUT I'LL HELP ANYWAY I CAN ,INFO,PARTS ,ECT.

AIRTIME

This is what I'm running now jon 509 at 5000 rpm tq 621 hp 591 5200 tq 612 hp 606 5400 tq 601 hp 618 5600 tq 592 hp 631 5800 tq 576 hp 636 6000 tq 564 hp 648. best tq is 647 at 4400. not bad for n/a, motor

Ratchet

Thanks............I jusr proof read my post....I should have said have ANY of the ones been na.

My apologies, weak link between the chair & keyboard

Thanks again !

bobby daniels

I'VE DONE A COUPLE OF 540'S AND 565'S ON THE DYNO AND NA ALWAYS GET 720 TO 740 WITH A BARRY GRANT 4500 AND 9.5 COMP AND A 288AR8 COMP CAM .THIS IS BELOW 5600RPM ,,YOU NEED ISKY LIFTERS AND COATED SPRINGS PREFERED WITH OILERS ON SPRINGS TO BE TROUBLE FREE ,BUT CHIT ITS A HOSS OF A COMBO !!! THEY WERE N/A AND AGAIN A HOLLY TERROR

Biggus

I`ve been thinking about this topic. If you are going start with a tall block and you will have to purchase a crank, why would someone build a 540 when you could use a 4.5"stroke crank and bore the block to 4.5" and make a 572"???

What are the advantages/disadvantages over 540 vs the 572???

I`ve been playing around with the numbers on my desk top dyno and a n/a 572 with a single plane intake, Holley dominator makes around 700hp @5200

blown1500

Hi, Biggus,
The 572 is a very good engine. The 540 is also a very good engine. I favor a 565-4.600" bore X 4.25" stroke with a 6.8" rod.
This has been a very good combination for me. You get less side loading with this combo, you unshroud the valves very well and get excellent power, especially with a blower. The 572 might be my choice NA., but with a blower the 565, I think, is a better overall, long life combo. With a blower, especially a Whipple set up, you will make more power than a Dyno 2000 predicts, especially at anything less than about 5,000 rpm.

Audiofn

Sorry I have been MIA the last two day, I have been working late. Back to the crank. It looks like the 4.25" stroke crank is the best choice, due to side load issues as were mentioned above. Who do you all think makes the best crank for a engine like this?

Jon

Biggus

If I were building it, I`d go with a Callies crank.

...just wondering, Is "Hank the Crank" still in business????