CAM gurus opinion needed

[GЯEENHORNET]

what do you guys think of these cam specs for a otherwise "stock" 400/440 with 10:1 cr and stock HP exhaust manifolds?

~ 233°in./240°ex. @ .050"
~ 280°in./287°ex. advertised
~ .316"in./.316"ex. camshaft lobe lift
~ 110° Lobe Centerline
~ 106° Intake Centerline
~ 34° IVO
~ 66° IVC
~ 77.5° EVO
~ 29.5° EVC

any input/suggestions would be greatly a

[bOb shingler]

should work great for you.

[rumblefish360]

400 or 440?

IMO, a bit agressive for a 400, a tad high in a 440 for exhaust manifolds, but it'll sing for ya. I, myself would knock 5/6*'s off of each duration number @ .050. I would like to see the same lift if not a bit more. .474 is fine. If I could get the cam lift up to .480/.490, I'd like it more.

I wold like to get a cam speced around, give or take on the heads worth/ability and stall area etc.....

228/236 - .480/.500, 110

[GЯEENHORNET]

well i do have the MP doctile 1.6 rockerarms. soooo that should be good for a .507" lift. i agree with you on the duration #'s (more or less), but thats the closest cam i can find
without going to a custom grind IE: moocho $$$ cam.

heads are fully ported 915's (260+cfm), 3000 stall & 4.30 gears. car wieghs about 3800lbs street trim (prolly get that to around 3600lbs).

[rumblefish360]

A custom shouldn't run much more money. Give a grinder a call.
Also, the new introduction of info changes things up. Also, not exactly knowing your intent or driving style.

Comp Cams makes small block cams for exhaust manifold applications. Inquire about big block applications. Be a test subject?????

[Dave 572]

Originally Posted by GЯEENHORNET

well i do have the MP doctile 1.6 rockerarms. soooo that should be good for a .507" lift. i agree with you on the duration #'s (more or less), but thats the closest cam i can find
without going to a custom grind IE: moocho $$$ cam.

heads are fully ported 915's (260+cfm), 3000 stall & 4.30 gears. car wieghs about 3800lbs street trim (prolly get that to around 3600lbs).

A custom grind is only $180.

[hotrod7043]

Call Bullitt cams the Got all Ultradyne old stuff, and a custom shouldnt cost that much more. And why is it agressive for a 400 and not a 440 400 is .020 bigger than a 440 to start.may I ask Hornet why Stock hp manifolds? you got some decent flowing heads.that cam should work decent.

[GЯEENHORNET]

rumblefish360, driving style would be mostly street, mabey couple times a year to the track.

Dave 572, thanks for the price heads-up.

hotrod7043, the reason for the hp manifolds is that there my preference, plus i had a guy cut them basically in half (lengthwise), port them to within a inch of there life,
welded them back together then had them ceramic coated. they should flow like Niagra Falls.

[BigBlockDude]

My 440 with 9.4 pistons, mildly ported 346 heads, manifolds, and dual 600 Edelbrocks I am running a Hughes cam. It works really good. Lots of torque, and pulls hard.

228, 232 @ 50
.524, .540 lift

Actually could have had a little more duration, but with 3.23's and about 2500 stall it works nice.

I ran a 13.62 on slippery radials.

Your cam choice should work well.

[rumblefish360]

Originally Posted by hotrod7043

And why is it agressive for a 400 and not a 440 400 is .020 bigger than a 440 to start.

Only in bore, not stroke, a streetable cam is what I was thinking. Forgeting his exhaust manifolds are ported, he could go bigger. In the end, it's what he wants to do. What I listed is what I would do in my current position and power making wants in my driving style.

[GЯEENHORNET]

thanks for the opinions guys

[DartGT66]

What is the lobe separation angle of that cam? In my opinion, the cam is on the big side, you may loose some low end while not picking htat much up high because of the exhaust manifolds. But the LSA and overlap are important too, the wider, the better for this purpose and cam specs.

[GЯEENHORNET]

the LSA is 110Â

[AMR-Resto]

I think it will be ok, better in the 440 then the 400, The longer stroker will eat up some duration. I wider 112 LSA would work better with the exhaust manifolds.

A friend on mine had a Cordoba with a 9.8:1 440, Stock 906, Torker intake, 750 Holley, MP 484" cam and exhaust manifolds, Withe a 10" converter and 391s it ran surprisingly well.

[GЯEENHORNET]

so the general thinking here is to get a custom cam with the specs listed, but ground on a 112 deg. LSA. correct? it'll prolly go into a 440.

[AMR-Resto]

Depending on gearing/trans and converter. I think that one would work well with 391s and a 10" converter. anything less and I would go smaller to around 225/235ish @.050"

[GЯEENHORNET]

heads are fully ported 906's (260+cfm), 3000 stall & 4.30 gears. car wieghs about 3800lbs street trim (prolly get that to around 3600lbs).

[crisser]

That cam should rip in a 440 with that setup. Might be a little stiff on the gears. 3.91`s or 3.50`s would be a little kinder.

[DartGT66]

AndyF did some work with a realtively "hot" engine with hipo manifolds, and tried different custom and list cams. I think the best working cam he tried was the old MP 284/.528" solid lifter cam with 1.6 ratio rockers. That was with a 3.9" stroker. That's a wide LSA cam with smallish overlap.

[GЯEENHORNET]

heres what the good ole boys at compcams.com recomended:

INTAKE MASTER 5203

EXHAUST MASTER 5203

ENGINE CRB 280H-10

GRIND NUMBER CRB 280H-10



HYDRAULIC Y/N YES

INTAKE EXHAUST

VALVE ADJUSTMENT HYD HYD

MAX GROSS VALVE LIFT .480 .480

DUR @ .006 TAPPET LIFT 280 280



VALVE TIMING OPEN CLOSE

.006 10 INT 34 66

11 EXH 74 26

THESE SPECS ARE FOR CAM(S) INSTALLED

106.0 INTAKE CENTERLINE



INT EXH

DUR @.050 231 231

LOBE LIFT .3200 .3200

ROCKER RATIO .00 .00



LOBE SEPARATI 110.0

ADVANCE 4

VALVE SPRINGS 924-16


this is a magnum 280H cam.

[Dave 572]

I'd think you'd need a split pattern cam,but you didn't post head flow numbers.If you had those numbers I'd bet your exhaust would be less than 75% of intake from .300" up.Plus the effiency loss of iron manifolds.

[GЯEENHORNET]

you'd be correct sir:

.300" ~67%
.400" ~69%
.450" ~70%
.500" ~70%
.550" ~70%
.600" ~71%
.650" ~72%

the ex. manifolds are, well, are just a tiny bit modded.

[crisser]

I had that cam a few years back. Very torquey and ran out of power at 4800 rpm. Those tech guys only know chebbies. I`d use the one you mentioned at the beginning or another 6 to 8 degree split.

[GЯEENHORNET]

yah i tend to agree with you. the 280 magnum cam is a pretty generic profile that seems to work
better with the smallblock craprolets 23 deg. head design.

[Dave 572]

I've got a Scotty Brown custom hydraulic that I just took out for a bigger custom Comp solid.The numbers are pretty close to what you're looking for considering your weak exhaust numbers.I was running stock 452 heads with 1 3/4" headers.Let me dig 'em up.

OK, here's the numbers:

Lobe lift: I=.335 E=.330
Rock. Ratio: 1.5
Valve lift: I=.503 E=.495
Adv. Dur: I=270 E=.286
Dur @ .050: I=226 E=.240 44* ramp speed so it's easy on springs,but could be quicker,AFAIC
CL: I=108* E=116*
LSA: 112*

I would think someone suggesting a cam for you would come pretty close to these numbers,give or take a few degrees or thousandths.

[GЯEENHORNET]

now that would be something i'd be interested in. what kinda rpm does that bad boy pull? what about idle vacuum?

[65BELVEDEUCE]

i say use the one ya got myself. put the 1.6 rockers on and ride. love the 3.91 gears, may go just a tad looser on converter...another 500-700 rpm. i think you will be completely happy with that cam. sounds to me like a mild version of a F.A.S.T. car or maybe an old super stocker with the choice of cam and ported manifolds.....thats my 2 cents.

[thatwasfunny]

The cam dave mentioned sounds good along with the MP.528
I ran it and think it would work real well with those head flow #'s

[GЯEENHORNET]

yah, MP's .528" cam is starting to look better and better. seems really to work really good with ex.mans too.