580ci HELP
 

HI, I WOULD LIKE TO KNOW IF ANYONE CAN HELP ME ESTIMATE THE HP AND TQ MY ENGINE WILL MAKE WITH THIS COMBI THAT I HAVE. 580CI CHEVY, MERLIN 345CC IRON HEADS PORTED, 9.5:1 COMP, MERLIN SINGLE PLANE REWORKED BY WILSON MANIFOLDS, 1050 DOMINATOR HOLLEY, CRANE CAMS #138101 MECH. ROLLER 254/262 DUR. 112 LOBE .714/.714 LIFT. ANY INPUT WILL HELP. THERE IS NO DYNO AVAILABLE IN THE VIRGIN ISLANDS THATS WHY I NEED INPUT. THANKS. :confused:

You have a better breathing version of my 572". You have bigger 345cc heads versus I hogged out a set of 320cc Merlins. You have 9.5:1 compression versus my 8:1 which gives you a 6% additional hp. You have a bigger cam. We have the same carb and I ran a single plane Brodix intake. Guessing 760hp.
Chuck

[ 02-11-2002: Message edited by: One Big Screw ]

Desktop dyno shows 694 HP @ 5500 RPM
726 FT-LBS. @ 4500 RPM
That is using large tube headers with open exhaust and putting the cam in on a 112+4.

WETTE VETTE HOW ACURATE IS THE DESK TOP DYNO. HAVE YOU COMPARED IT WITH REAL DYNO RESULTS AS YET? THANKS.

With stock parts it comes very close. One area of uncertainty is in the heads. I choose "fully ported rect. port with 2.30" int. and 1.90" exh". This is just a guess that is probably close to what you have. If you have the flow numbers I can enter them in and probably get a little closer. The next option for heads if you don't know your flow is pro stock heads, which are like a fully ported big chief. I doubt your heads flow this good. On an LS6 Chev. the numbers come out right at 460 hp which is what the advertised power is.

THANKS WETTE VETTE FOR THE INPUT. ANYONE ELSE HAVE ANY INPUT THAT CAN HELP ME KNOW WHAT I CAN EXPECT. WETTE VETTE MY HEADS WAS DONE BY JIM VALAKO AND I AM GOING TO GET THE FLOW # FROM HIM SO I CAN GIVE YOU. THANKS.

1.2HP/CID will be very close for your setup. That is 696HP.