LordTTK

Hi i am in need of a new camshaft, but its a real jungle with camshafts.
So i hope someone here could help me to choose the right Hydraulic flat tappet camshaft.

My engine is a 350 2bolt from a -73 Nova casting numbers 3970010 i suppose the pistons,rods,crank, are stock.

The heads are ""WRL-012250"" World Products Sportsman II Heads
intake:2.020 in.
exhaust:1.600 in.
Combustion Chamber Volume:72cc
Intake Runner Volume:200cc
i will use 1.5 roller rocker arms

Intake manifold is a Edelbrock Performer RPM.
Carb: Rochester Quadrajet 750cfm Non CC.
Hooker long headers.
Manual transmission.

I am looking mostly for low and mid range power, and torque is always nice.
The car is a Street/Strip, not a daily driver.
And it donīt need to pass emission controls.
I might have forgotten something but please ask me if i have.


//Teemu

1991CamaroRslow

iTrader: (3)

You've got everything covered but gear ratio and stall speed. Anything specific you want? Do you mind a rough idle? Do you plan to street drive more than strip drive it?

LordTTK

GT4 : AXLE REAR, 3.73 RATIO (DUP WITH 5 X 1)
G92 : AXLE REAR RATIO, PERFORMANCE
Those RPO codes i have and it should be the same real axle still.
Cos when i bought the car the engine and trans was totally original so the real axle should be too i think.

Stall speed? maybe its me or how do you know the stall speed with manual transmission?

Well a little rough idle is ok but not much, i will drive it mostly on the streets and sometimes take it to the strip.

1991CamaroRslow

iTrader: (3)

LOL the stall speed on a manual trans is variable and controlled by the left foot. I would recommend one of the new Lunati Voodoo camshafts. Check out Summit part number LUN-60102LK this camshaft is pretty mild but would be a good match for what you want. The Voodoo camshafts are basically newer versions of the Extreme Energies series cams by Comp Cams, they work on the same principles and are about as up to date as you can get. You may also want to look into the Comp Cams Xtreme Energies series. If I were you I would stay mild on the camshaft keeping it right around .500 or a little less lift and under 220 at .50 duration.

Sonix

iTrader: (1)

You have 200cc port heads, "mild" is no longer an option for you.

The voodoo idea is a good one, but I think that small one is going to be a little sluggish down low due to the big heads, and choked up top due to the short duration.

I'd look at the 60104 or the Xe274h from Comp. Those should work pretty nice. With 3.73 gears and a T5 you can afford to cam it up. It won't be "weak" at the low end, just get used to not lugging it around at 1400RPM anymore. It'll want to be above 2000RPM.

philip052374

iTrader: (2)

like sonix said, with those port size heads, mild is not an option. neither is low-mid range power. with the 72 cc heads you are also going to be low on compression, so a big lift and duration cam is going to make the bottom end worse. big heads like big cams, and big cams like rpm and compression. i have the voodoo 60105 in a 2700# mazda rx7 with a 3200 stall and it hauls butt, but that motor is running 10.5:1 compression. you need to figure out what kind of compression the motor is going to have with the 72 cc heads and find a cam that is going to give you the best dynamic compression ratio(8.2-8.4 is best).

Sonix

iTrader: (1)

oh, whoa, didn't even notice that.
Stock shortblock and 72cc heads with those ports is going to be LAZY.

Do you already have the heads? I might look into new pistons, or new heads. That's going to be the worst of both worlds.
Lazy at low end, lazy at top end

LordTTK

Yes i already have the heads.
But so it should be the easiest way to get them work together and get good results is to change pistons?
One thing i wonder about too is what should happen if i trow in a small blower like weiand 142 should it be even more an catastrophic combo then?

Sonix

iTrader: (1)

Right now is your chance to choose.
A blower would work GREAT with that setup. Pick a blower cam, and use a blower.

OR - get flat top pistons and a mildish cam. This is less than ideal, but cheapest.

LordTTK

Ok, i am not sure yet but i have looked at blowers some time now so maybe it should be the best time to buy one now, what cam should you recommend for a weiand 142/144?

Sonix

iTrader: (1)

A blower cam. Something with 10* more duration at .050" on the exhaust vs the intake, and a 114° LSA or more.

1991CamaroRslow

iTrader: (3)

Go with the blower and blower cam, you won't regret it.

LordTTK

What do you think about these 2 camshafts
http://store.summitracing.com/partde...K&autoview=sku
and
http://store.summitracing.com/partde...4&autoview=sku

Sonix

iTrader: (1)

The first one isn't even close. The second one is TINY. Let me see if I can find something...
http://store.summitracing.com/partde...4&autoview=sku

or probably even better

http://store.summitracing.com/partde...4&autoview=sku

or

http://store.summitracing.com/partde...4&autoview=sku
(not quite as good)

http://store.summitracing.com/partde...1&autoview=sku
not all that aggressive, but pretty good

Don't rule out a solid flat tappet.

F-BIRD'88

Get the blower and Crane #113801 camshaft. you'll like it.
You'll probabily want to get and prep a 750cfm holley for the blower.

This cam will also work well on a N/A motor like yours in case the blower gets put on the wish list.

low compression ratio 350+ world Sportsman II heads +Crane 113801 cam +750cfm (blower preped) carb,+ ignition boost retard + 6 to 7PSi boost in a Nova with 3.73's and a 4 speed, = You'll be a grinning from ear to ear first time ya punch 'er !!

A great combination

here are the cam specs
http://www.cranecams.com/index.php?s...01&lvl=2&prt=5

If you'd like to rebuild your 350 to gain some durability with the supercharger and allow even higher boost and power use these forged low cr turbo/supercharger friendly pistons
http://store.summitracing.com/partde...0&autoview=sku
If you'll be sticking wiht the stock cast pistons, limit the blower boost to 6-7psi tops, keep 'er rich and go easy on the spark timing. (26-28deg) use cold non extended tip plugs

Sonix

iTrader: (1)

:whathesaid: That's another very good choice. I never suggest crane cams because finding a cam on their site is like pulling teeth from a rabid badger.

coppergmc

Sorry to jump in. Don't really know a lot about blower cams but thought that this cam was close to what you were looking for http://store.summitracing.com/partde...5&autoview=sku

I've used this cam in NA engines and it performed well. You can't beat the 89 bucks for cam and lifters.

1991CamaroRslow

iTrader: (3)

That would work well for a blower cam but I must say that cam sets are cheap and NOT the place to save a few bucks. I'de go with a quality name brand camshaft set if it were me. Lunati, Edelbrock, Comp Cams are all good choices.

Sonix

iTrader: (1)

Edelbrock I think makes good intake manifolds and that's it. I can't think of any decent edelbrock cams myself. That summit knockoff is made by edelbrock as well.
That's a lazy grind there, I wouldn't recommend that one. As mentioned, the cam is basically the main brain of the engine, it sets all it's running parameters. For the $100 difference i'd spend it on the cam

F-BIRD'88

Copper you are right, this Summit cam makes a good blower cam and they do also work well in moderate N/A motors. Hard to beat for the price too.
The Crane HMV/Power-Max line of cams are just a little sweeter (higher "hyd intensity") to cop a Harvey Crane phrase, without getting too "extreme" or casting a "VooDoo" spell on the motor and your Wallet.

The Summit cams are good generic grinds like sold by Elgin (Prostock) and Crane Blue Racer. and Speed Pro brand among others.
They are likely mass produced by one of the biggies, Or by the same company(s) that make all the popular off the shelf, high volume cams for the biggies. They work very well over all when properly applied.
I've never heard of anyone having specific problems with the Summit house brand cams. Can't be that bad. Too bad the line is not more extensive
like the Elgin Prostock line etc.
I'd have no problem using Summit brand cam+lifter sets if the application and budget called for it.

coppergmc

I figured that if you were trying to save a little money using the flat tappet cam to save money, you might want to use an inexpensive cam. That cam worked well in a n/a engine that I built about 2 years ago for a customer.

I'd prefer to use a roller grind from comp. I've used several different companies grinds and always go back to comp especially in a custom app. Isky isn't bad either but their cams seem to run higher than you would expect. By the way, Isky has a cam similar to what you were looking for in lsa and duration.

F-BIRD'88

yes an Isky 270/280 split pattern on 112LSA Mega Cam #201271/281-12
is very similar to the Crane and would work very well also.

Handy7rick

Only one choice in my mind; ISKENDERIAN cam #20127128112. This cam : .465 lift / 221* intake .465 lift / 232* exhaust durations at .050. This cam pulls great from 2200- 6500 RPM. With minimum 3:70:1 rear gear performs great ,can get by with 331:1 rear gears also and still perform strong.Good idle even can manage stock torque or 2000 stall for peak performance.But hands down ,these cams perform like the bigger cams that require much more gear in differential. Highly recommend 4L60 overdrive with 3:73:1 gears to perform and be very Streetable! Good Safe Hotrodding,handy7rick@yahoo.com

Handy7rick

Just noticed you have manual trans.That will only improve your performance,depending on rear gears may effect top end speed(needed to compete with today's Factory hot rods with overdrive).Also, depends if you have 5th gear or just a 4speed?

Fast355

iTrader: (2)

You realize he was posting over 7 years ago, right???