cam 110 cent line 246 duration int and exh 630 lift int and exh. bb2 extra heads cncd chambers 9.35-1 comp, 588 inch tall deck merlin intakes 4150 100cfm carbs peak torque at 4400 and peak hp at 5300rpm. air fuel at 12.8-1 don't have the sheets motor still there awaiting my changes as soon as I decide what they are going to be. dyno guy said the cam is way to small for the motor. said it flatlines at 5300 im thinking I need cam intale and a big dominator

Was the air fuel ratio calculated or measured in the exhaust?

in exhaust with a sensor

Although your cam is not ideal, I have not seen a camshaft be responsible for a 800-900rpm spread between Pk Tq and Peak Hp.

Induction / exhaust / fuel supply or metering / ignition / valvetrain ...yup, seen those cause it.

Who's 1000cfm carb ?

What ignition ?

Your fuel pump or dyno's - and what is it ?

What's your minmum fuel supply/feed orifice size ?

What's the actual valvespring rate as installed - not stated.

You need a good Marine cam 250- 260 degrees@50 on a 114 LS, I will call you today.

dynos fuel pump dui ignitions pro system carb re done 2 weeks ago by aed -8 fuel line spring are 140 at 1.94 installed height 425 at 1.250

The BB-2Xtra come with 2.300 intake valves. The 140/425 springs may be a little on the light side for controlling them #1. #2, many shops do not test the springs on purchased 'assembled heads' and therefore improperly set up springs can be missed. IE: the springs may have even less psi than stated.

My IMHO is that 140/425 springs are even on the 'light side' for 2.25 intake valves reving to mid to upper 5k's.

Not saying this is your issue, but saying that it is very suspect as 1 issue. Not comfortable area for me and probably others. 170-180 seat is more the norm for performance HR's now-a-days.450-480+lbs open. For instance Many HP500 (222 at .050" HR) /500EFI's (230 at .050"HR) being retrofitted with 155-165 seat psi springs.

Call experienced cam guys with what they'd run for psi's with your set up.

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Another IMHO is anything 650hp or more will make more power with a Dominator.

A 1000HP carb make a motor 'flat line' - not unless it's F*ked up.

Valvetrain, fuel supply, and ignition are biggest causes for a motor to 'flatline' - especially if it's before the where Hp peak shou;d be - again 1200 or so rpm past Torque peak.

those heads are too big for a natural aspirated motor I think the runners are something like 385 motor is lacking air velocity with that big runner

Gotta spin it up then!

720ft/lbs at 4500rpm out of a low compression motor is not lacking low speed torque. He's not carrying torque to a higher rpm. Known as HP.

Right now it's making power for a Hatteras (maybe slight exxageration), not a High Speed Performance Boat.

Copied and Pasted from Brodix's site: http://www.brodix.com/heads/big-bloc...-bb-3-series26

The BB-2 X head works well with a light car or large engine (509-555 cu in). It has a 340 cc intake port and flows over 360 cfm with only the bowls blended and the intake ports matched to the gasket. The BB-2 X may be purchased angle milled to 110 cc or angle machined to 98 cc.The BB-2 XTRA head works well on a 540 cu in or larger engine. It has a 365 cc intake port and flows over 375 cfm with only the bowls blended and the intake ports matched to the gasket. The BB-3 works well on a 540-605 cu in engine. It has a 370 cc intake port and flows over 370 cfm,