C3Paul

Hi

Would you be so kind and suggest a good hydraulic roller camshaft for my 383ci, please?

This is going to be a street driven only car with standard 1980 4-speed MANUAL Gearbox and I would like something between 2000-5500/6000RPM range.

This was the cam I was going to buy before I sold my Cast Iron Heads

http://www.summitracing.com/parts/LUN-501A4LUN/ - with step nose

This is the spec:
GM 1986 +0.030” roller block
Scat 3.75” crank
Scat 6” connecting rods
Mahle forged piston
RHS Pro Action Aluminium 64cc/200cc intake heads
Comp Cam 987-16 springs
Comp Cam 1.5 roller rockers
Edelbrock Performer RPM Intake
Static compression 9.9:1

AND;

I am toying with the idea of a TKO 5-speed conversion in the future.
Will I need to change the cam?

Thank you

gkull

I had this same cam in my original 383 only in the SR version.

http://www.cranecams.com/?show=brows...tType=camshaft

gkull

I later went with even more lift and duration and it is a fun motor with my 5 speed

cam cooper

download comp cams program on choosing a cam

427Hotrod

I just spec'd a custom Comp Hyd Roller for a buddy with a very similar combo...383 and AFR 195 heads. We used the XFI lobe series and had it made with the #3038 and #3039 lobes on a billet core with the iron distributor gear option. We put it on a 110 LSA to keep it *wife friendly* as it is really is his wife's Vette.....he just gets to play with it! Turned out sounding killer and will be a serious runner with good manners.

We also used Morel lifters with the tool steel body so we could get some serious RPM out of it without issues.

The Lunati cam you selected is very mild...you can use more with the parts combo you have.

LOBE RATED DURATION IN LOBE TAPPET LIFT @ THEORETICAL VALVE LIFT
NUMBER DURATION DEGREES LIFT TDC @ “0” LASH ROCKER ARM RATIO
CAMSHAFT TYPE
@ .050” @ .200” 106° 110° 1.5 1.6 1.7
3033 264 212 135 .341 .050 .040 .512 .546 .580
3034 270 218 141 .347 .059 .048 .521 .555 .590
3035 276 224 147 .353 .069 .056 .530 .565 .600
3036 282 230 152 .355 .080 .066 .533 .568 .604
3037 288 236 158 .357 .091 .076 .536 .571 .607
3038 294 242 163 .360 .102 .087 .540 .576 .612
3039 300 248 169 .362 .114 .098 .543 .579 .615


JIM

gingerbreadman1977

you are just in correct compression ratio for this cam and with a 383 i think it would be a match made in heaven from the crane powermax series 119661

Grind Number: HR-230/359-2S-12.90 IG
Operating Range: 3000-6500 RPM
Duration Advertised: 292° Intake / 300° Exhaust
Duration @ .050'' Lift: 230° Intake / 238° Exhaust
Valve Lift w/1.5 Rockers: .539'' Intake / .558'' Exhaust
Lobe Separation Angle: 112°
Max Lift Angle: 107° ATDC Intake / 117° BTDC Exhaust
Open/Close @.050'' Cam Lift: Intake - 8° BTDC (opens) / 42° ABDC (closes)
Exhaust - 56° BBDC (opens) / 2° ATDC (closes)

C3Paul

Hi,
Thank you for your help so far.

The problem is that all this numbers mean nothing to me as I do not know much about cams.

I have noticed that the cams I am being offered start from 3000RPM, however I feel that this is too high for me.

My car is 4-speed manual and at 2000RPM I am doing 70MPH at 3000-80MPH.

The speed limit is 70MPH and my speedo goes to 85MPH.

At 90MPH if I get pulled over I will get heavy penalty and maybe lose my Driving licence. (and I still wont be at the upper range limit of these cams!!!)

This is the reason why I would like something starting at 2500 RPM and go to about 5500 so that I can use the cam.

gingerbreadman1977

Usain Bolt can do the 100 meter sprint in 9.56 seconds but it doesnt mean when he goes down the corner shops to pick up milk he runs at that speed...but its nice to know he can

likewise with your car, just because it has the ability to go fast and rev to 7000 rpm it doesnt mean your going to drive it around on the limit everywhere....but its nice to know you can

gkull

The crane cam card is based on a mild built 350 ci motor. You have heads and 33 more ci. My 230/238 cammed 383 can drive around at under 2000 rpm in 5th gear and still be able to floor the gas pedal.

When they talk about normal operating rpm. Is talking about when the cam will be in it's best efficientcy.

with a 383 I was able to get good miles per gallon. Gingerbreadman brought up a good point. Roller cams when combined with good heads can get into detonation problems because of their superior cylinder filling. So you can't use a lessor duration cam with 9.9 c/r

Gordonm

You can see the cam in my signature. It is a solid roller and I had it ground with 112 LSA to try and keep the O2 sensors happy with the fuel injection. I talked with Gkull and with Comp cams and with the fuel injection manufacter on this and came up with this cam. I have put about 100 miles on it so far and it has more power than is useable for the street. I am running a T56 with a 3.70 gear with this combo. So far pretty satisfied with the selection. It is on a billit core with a cast iron gear. Only a few more dollars but worth it.

64_365

Do you already have these parts or is this a shopping list?

63mako

http://www.lunatipower.com/Product.aspx?id=1989&gid=289 You need at least 230 intake duration @ .050 with your compression. I like this one. Do you need a retro roller or is it a factory roller block?

gingerbreadman1977

line 2

This is the spec:
GM 1986 +0.030” roller block
Scat 3.75” crank
Scat 6” connecting rods
Mahle forged piston
RHS Pro Action Aluminium 64cc/200cc intake heads
Comp Cam 987-16 springs
Comp Cam 1.5 roller rockers
Edelbrock Performer RPM Intake
Static compression 9.9:1

63mako

Sorry, missed it.

gkull

The Crane I listed is .900 base circle for clearance of stoker motor 6 inch rods.

the Lunati 231/239 110 has 3.5 degrees retarded exhaust and 1.5 degrees advanced intake when compared to the Crane 230/238.

So the Lunati would have minor increased reversion at idle and give a more race car sound at idle where the wider lobe sepperation Crane would be smoother and somewhat better gas mileage

C3Paul

All of these parts are now at home


gkull
The Crane I listed is .900 base circle for clearance of stoker motor 6 inch rods.

Is this it: http://www.cranecams.com/?show=brows...e_Size=262-400 C.I.&partNumber=119661&partType=camshaft

FAIR IDLE, PERFORMANCE USAGE, GOOD MID-RANGE TORQUE AND HP, 3600-4400 CRUISE RPM, 10.0 TO 11.5 COMPRESSION RATIO ADVISED, .900" BASE CIRCLE FOR LONG STROKE CLEARANCE. BASIC RPM 3000-6500

I just feel that my cruise style is from 2500/3000RPM

BUT
I am not an expert so if you feel that this is the best cameshaft I will buy it.

gkull

I was able to lope down the road at 2000+ rpm in 5th overdrive

C3Paul

OK
I am going to order this Cam
http://www.cranecams.com/index.php?s...61&lvl=2&prt=5

However

Do I need anything special like:
Step nose to work with the 1986 roller block
special distributor gear drive
Will these springs work with this cam? http://www.summitracing.com/search/?...d=987-16&dds=1
What Dynamic Compression will I get with this cam?

.....?

Paul

gkull

My crane cam came with a sleeved gear for standard dist. drive gear. the block you will have to ask Crane cams.

The springs would work, but why run on the marginal edge of max lift. those springs max lift is .600 and you are opening the valves just below that with 1.5 RRockers i'd ask for springs like Behive with more lift.

C3Paul

Can you explain a bit more, please

I am going to use steel shims under the springs to protect the Aluminium heads. Does it change anything?