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-   -   is this to much cam...? (http://www.hotrodders.com/forum/much-cam-221680.html)

kennyhammond 07-14-2012 03:43 PM

is this to much cam...?
 
ok building a mild 350 motor for a daily driver for a buddy.... he has a set of 2.02 heads and a stock bottom end 350... the heads have been millied for more compresion... the motor is going in a 89 1/2 ton truck.... this is a cam i found would it be to big ...if so what would be a good pick.... he was very spacific on wanting it to sound radical... ( i tryed to explain it would suck to drive) but i will do what he wants.....

CAMSHAFT SPECIFICATIONS
Valve Lift -- Int."/Exh." .488/.509

.050" Duration -- Int./Exh. 234/244

Lobe Seperation Angle 107/117

lmsport 07-14-2012 04:10 PM

Bigger is always better.
Needs 11:1 compression.
10:1 overall drive in first gear.
2800 stall
Headers and the Loudest exhaust he can stand.
650 or 750 carb
Non-ECM controlled HEI distributor
Make sure the valve springs are the correct ones for the cam

kennyhammond 07-14-2012 04:17 PM

OK well ...we are running the stock bottom end on pistons.... so I should go with a smaller can hu.... what should I look for lie lift and duration sizes for cam....

vinniekq2 07-14-2012 08:35 PM

cam
 
A lot of cam manufacturers offer retro "sounding" cams that work well.They are similar to the old GM 350 hp 350 cam. Use a hydraulic flat tappit cam for that lumpier idle.With stock compression a 106 degree intake centre line have a bumpier idle compared to 110 or 112. 450 lift is probably enough.really depends on how high you want to rev ,,,use headers on this application as stock manifolds seem to tame the cams sound a little.270 ish advertised duration is plenty

kennyhammond 07-15-2012 01:43 PM

OK just baught a Crane energizer 100042 can....specs say its 210/210 duration.... with 266/266 duration at 50" and has 440/440 lift on 110 lsa ..... will it work good in what I am wanting ....I am worried about the idle being smooth

vinniekq2 07-15-2012 01:57 PM

cam
 
very mild,might have a very slight bump in the idle,,,maybe if idle speed is 750 ish

1971BB427 07-17-2012 10:43 AM

If the owner wants a radical sounding cam, that's far from it. It will perform great, but very smooth idle. Wont be much more than what some refer to as an "RV cam".

F-BIRD'88 07-17-2012 06:32 PM

Is the owner willing to change the torque converter and rear gears?
Does he really want a take no prisoners racey idle in a otherwise stock motor?

If so use this Howards dirt cam.
Howards Cams 112751-06 - Howards Cams Oval Track Lift Rule Hydraulic Flat Tappet Camshafts - Overview - SummitRacing.com

Degree the cam in properly and install on a advanced 100 intake C/L
Get some howards valve springs too.
Requires a 3500+ stall converter and should use 4.56+ gears in a truck.
The distributor will need to be recurved. Lock out the mechanical advance system.
set the locked fixed timing at 34-36 deg BTDC.
Carb power valve 3.5 or 4.5.

Very rough racey idle. low manifold vacuum at idle.
bad on gas but sounds killer and will go like hell with the right converter and gears.
The taller the tires the steeper the gears need to be.
Not for the faint of heart.
Will not work woith a stock converter.

vinniekq2 07-17-2012 07:50 PM

that Howards racing cam is a lot bigger than the original posted cam. That would have a very very lumpy idle,especially because its hydraulic.You would need vortec heads to make the best bang for the buck.

78 monte 07-20-2012 06:17 PM

Crane makes/made an Energizer cam with 218@.050 and .450 lift ground on a 106LSA that would sound pretty snotty and also be within a good size range for that build.
With a smaller LSA you will get a narrower "peakier" power curve,though.

BigEd36 07-20-2012 08:19 PM

Quote:

Originally Posted by 78 monte (Post 1575568)
Crane makes/made an Energizer cam with 218@.050 and .450 lift ground on a 106LSA that would sound pretty snotty and also be within a good size range for that build.
With a smaller LSA you will get a narrower "peakier" power curve,though.

78 monte beat me, I was gonna suggest the same cam. The same grind is available as the Crane 274HO6 grind 274HO6 cam/lifters at Summit Racing, the Summit K00172 (supplied to Summit by Crane) Summit Racing SUM-1785 cam (K00172 cam & lifter kit) at SummitRacing.com, and the Elgin CL1785PK Cam/lifter kit at Northern Auto Parts Elgin CL1785PK at Northern Auto Parts. This grind, with it's tight 106* lobe spacing angle, has a pretty rough idle, Crane lists the powerband as 1800-5400. Crane states this cam is good for 8.75:1 - 10:1 compression ratios.

Kenny, this cam may satisfy your buddy's "cam music" desire and still give good performance. Here's some YouTube videos of this grind:






mud.man.rj 07-20-2012 09:13 PM

Yep, 78Monte is right on, the 106 lsa makes it sound nice but not too big to have drivability probs. A mild stall will still help a lot though, min 2,500.

my87Z 07-24-2012 10:47 AM

"bigger is always better" :nono:


since i'm guessing that they are stock smog style heads that have been milled down for more compression, I would say that there is no point in going over .450-.470" lift max on this motor cause the heads wont support any higher of a lift. as mentioned tighening up the LSA on the cam will give it a choppier idle, a would recomend a cam in the 220 @ .050 range with around .440-.460" and a 108LSA. matched with some headers and 2.5" exhaust and some 2 chamber mufflers, I recomend the Thrush welded mufflers (i use them on my truck, and i've had a lot of complements). a 600-650 vac secondary carb will do fine or if you can find one and know what you are doing then go for an older 750 Q-jet. He will have a lumpy idle but it wont be crazy. the problem i see here is that even though he will have a lumpy idle he still wont likely have over 250-280hp due to the heads. so my near stock GMC 2500 with the 340hp (factory) 6.0L will still hurt him.

*for a decent performing and sounding motor you will need to change the heads*

BigEd36 07-24-2012 12:37 PM

My87Z, you just described the Isky 270Mega cam, and it would be a very good choice also.

my87Z 07-24-2012 02:59 PM

yup, that would be a decent cam

Isky Racing Cams 201271 - Isky Hydraulic Flat Tappet Camshafts - Overview - SummitRacing.com

it would have a decent idle, it's kinda of on the boarder with whether it would need a higher speed stall converter or not. i think you could get away with a stock converter. but if it where my project i would put a 2500-2600 stall in it. and if you are running anyting larger than a 30-31" tall tire then i would recomend atleast 4.10 gears. epecially since the truck should have a 700r4 in it.

before you go and order that cam you will want to check and see if the stock heads w/ what ever springs, stock or aftermarket can handle .465" lift. I personally think it will need new springs and shims because i would want around .050" before i got into any kind of coil bind issues, so you would be looking at a set up that had atleast .500-.525" coil spring depression in to it before bind. not to mention you will have to look into what seat pressure ISKY recomends for this cam and match that too.

i still think that another set of heads would be a worth while (even money wise) purchase. the problem is that you have set your self up with those domed pistons so you will have to go with around a 70-72cc combustion chamber heads to get your compression levels down to a decent level.

may i ask why you went with a .015" shim gasket? I hope that it wasn't for more compression cause you could very well end up with some bent valves pretty fast if everything else doesn't check out.


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