Small Block & Big Block Chevy Specific - Horsepower Estimate

I'm currently in the middle of an engine build, wanted to see what you experts thought the final numbers would be....

427 BBC .60 over (439 ci)
Gm Forged Crank
Crower Billet rods
Ross racing pistons 0 dome
Crane hydraulic roller .610/.632 lift 234/242 duration at .050
Crane hydraulic roller lifters, comp pro magnum rocker arms
dart 325's 2.300 int. 1.88 ex. matching intake
Compression ratio of 8.0 to 1

I know this engine seems a little unproportioned, but it's being built for a centrifugal supercharger eventually :devil: but any ideas on what the N/A horsepower/torque would be would be greatly appreciated, thanks.

that sounds like a good combo when you throw on the sc.i'd say numbers right now of around 525 hp,500 tq.the compression you have will kill your na numbers.

My guess......
370rwhp / 410rwtk
with blower....
690 / 810 :)

If you give me the rest of the specs like bore,stroke,chamber size, piston relief cc,intake type ,induction type and cfm the rest of the cam specs either at .050 or seat to seat well just everything you can think of I can do a desk top dyno the more info the less innacurate it'll be.

Bore = 4.31
Stroke = 3.76
head CC = 119
dart intake W/ fuel injection
when the blowers goin on there will also be an air to air intercooler added :)

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 10 BTDC 44 ABDC 107 234 °
Exhaust 58 BBDC 4 ATDC 117 242 °

514hp@5000 and 540lbs@5000

now I had to guess that you were gonna use a single plane manifold and 1000cfm also I put large tubes with muffs and the cam specs did not completely agree with what I put in off your info also remeber this is at the fly and it's a more educated guess. I'm gonna upgrade to the advanced Desktop Dyno prolly today and after playing with it I'll do yours again see if you can get me the rest of the in fo I guessed and hopefully the cam specs will work with the upgrade

also whats the center line on that cam 109*?

P

If your gonna be driving this thing around for a bit without the SC y not just throw a set of pistons in it to up the compression a bit? that way you get some power.

It'll only be drivin like this for less than a year, plus this engine is goin into a 1999 30th anniversary T/A :eek2: So they'll be more than enough work to just get that in there and goin.