rdicarlo

Hello, I'm planning on installing a new cam in the spring and I'm ready to buy some parts. But, I'm not sure which cam I should go with...

Here is what the car has on it:
Mostly stock L98 Hydraulic Roller motor with 100K miles
OBX Long Tube Headers
Adjustable Fuel Pressure regulator
Air Foil
160 degree Tstat
AIR pump delete
March 3 piece aluminum pulleys
Open box K&N air filter

I don't plan on immediately upgrading the TPI... But, may have the plenum, runners and possibly heads ported... Big maybe. I have a spare set, so I may try porting it or may send it away to get done. For now lets assume I'm not going to touch the tpi, except for the afpr and I'll leave some HP on the table

This is what I want out of the cam upgrade:
As much HP as I can get with my setup while maintaining drive-ability
More low to mid range torque
Noticeable lope at idle
Doesn't have to pass state emissions
I will probably never go to the track with it or street race
a dependable car with decent gas mileage

I have searched the site and found that the following cams may be a good fit

The ZZ4 cam $239.97
Chevrolet Performance Hydraulic Roller Camshafts 10185071
Cam Style: Hydraulic roller tappet
Intake Duration at 050 inch Lift: 208
Exhaust Duration at 050 inch Lift: 221
Duration at 050 inch Lift: 208 int./221 exh.
Advertised Intake Duration: 275
Advertised Exhaust Duration: 280
Advertised Duration: 275 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.474 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.474 int./0.510 exh.
Lobe Separation (degrees): 112

The LT4 Hot cam $239.97
Chevrolet Performance LT4 Hot Cam Hydraulic Roller Camshafts 24502586
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,800-5,800
Intake Duration at 050 inch Lift: 218
Exhaust Duration at 050 inch Lift: 228
Duration at 050 inch Lift: 218 int./228 exh.
Advertised Intake Duration: 279
Advertised Exhaust Duration: 287
Advertised Duration: 279 int./287 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.492 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.492 in.
Valve Lift with Factory Rocker Arm Ratio: 0.492 int./0.492 exh.
Lobe Separation (degrees): 112

The Lunati Voodoo Part Number: 20080720 (60120) $299.97
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,600-5,600
Intake Duration at 050 inch Lift: 211
Exhaust Duration at 050 inch Lift: 219
Duration at 050 inch Lift: 211 int./219 exh.
Advertised Intake Duration: 262
Advertised Exhaust Duration: 270
Advertised Duration: 262 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.507 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Valve Lift with Factory Rocker Arm Ratio: 0.507 int./0.515 exh.
Lobe Separation (degrees): 112

Its ok if I have to get a tune after I install the cam, but would prefer to wait until after any intake upgrades take place...

Have you used any of these cams in an application similar to mine?
What did you think of it?
Would you install a different cam for this application?
Would you install new springs too now? What type or part number?
Would you install new roller rocker too now? What type or part number?
Would you install new push rods too now? What type or part number?
Did I miss anything that I should consider?

Thank you very much for taking the time to read this and help me out.

MrWillys

The ZZ4, and the Lunati will compliment the TPI design without sacrificing mileage. The Hot cam's upper RPM range is higher than the manifold can use, and will see a decrease in mileage IMHO.

bjankuski

I have run the ZZ4 in a mostly stock L98, it added some power and idled OK with the stock tune but it should really be tuned because the stock 550 RPM idle is really too low for the cam. If I was picking these cams for myself I would pick the hotcam but I am not sure what you really want. The hotcam will idle rougher and make more power then the other too cams and in my opinion it is fine. The smoothest cam will be the Lunati cam and it will add more power then the ZZ4 cam because its overall duration is the shortest but its .050 numbers are larger then the ZZ4 cam.

As far as pushrods go you will need to check lengths at install to see what you need. Springs will have to change, and rockers do not have to change.

cv67

used that Lunati cam yrs ago in a 10:1 350 build
Used an $899 cheapo shortblock from a local rebuilder
Ported TPI shortie headers stock Edelbrock performer heads. Car made outstanding torque I was really surprised, pulled like a stroker. Nice idle (not rumpity but had a little authority to it) passes Ca smog
hitting passing gear (2nd to 1st) just roasted the tires

C4in mesa

I suggested the Comp Cam 08-501-8. It doesn't get any recognition as a very nice choice for a modest upgrade. I have 10,000+ miles with it now and zero tune. Idle never changes. Along with the other mods made it really fits well.

vader86

Accel LPE 74211, would be very close to the Voodoo. If I had to pick amongst those I'd go with the voodoo.

rdicarlo

I pulled the specs on this cam to compare:

COMP Cams Xtreme Energy Camshafts 08-501-8 $296.97

Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,200-5,200
Intake Duration at 050 inch Lift: 212
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 264
Advertised Exhaust Duration: 269
Advertised Duration: 264 int./269 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.495 in.
Valve Lift with Factory Rocker Arm Ratio: 0.488 int./0.495 exh.
Lobe Separation (degrees): 112
Computer-Controlled Compatible: Yes

MrWillys

I always recommend the 08-501-8, and you could even consider using it with 1.6:1 roller rockers to really have a great combination that works well.

rdicarlo

Attached is some info on the the cam:
Lingenfelter Hydraulic Roller Camshaft L98 LT1 LT4 1987-96 TPI
211/219 .530/.560 HR112 74211 $349.95

I'm a big fan of your website.

rdicarlo

thanks everybody for the great info. How do I decide which size roller rockers to use with the cam?

cv67

With a faster ramp type cam ie lunati/comp xe etc I prefer a 1.5. Sometimes too much is a bad thing meaning valvetrain life.

C4in mesa

I was told that had I gone with 1.6 roller rocker arms the gain in HP would have not been more than 6-10. Weighed against the wear on the valvetrain I stayed with 1.5 as advised by the builder.

rdicarlo

Thanks everybody for all the feedback and support.
I'm leaning heavily towards the Lunati Voodoo 20080720 (60120). Can you recomennd springs, rockers and a double roller timing chain set. Possibly any other maintence item that I should replace while I'm in there. Part numbers to order will be great.

Thanks.

Calderone

zz4 cannot be used with 1.6's
check the lpe cam

bjankuski

Why, I used the ZZ4 with 1.6 rockers and it worked fine for many years.

Calderone

Yes but i believe they are not optimal together i asked this before:

http://forums.corvetteforum.com/c4-t...r-rockers.html

MrWillys

Ramps are way steeper and faster today than in the early 90's. The ZZ4 cam is a great compliment to the TPI, and will operate well even with 1.6's even if a journalist says he could hear the valve bounce while driving???? That's funny stuff there!

rdicarlo

so the recommendation is 1.5 RR with the lunati voodoo cam specified.

What is a good spring set to buy? Are there any good spring and 1.5 RR sets out there? I also want to do the timing chain. Can you recommend a double roller that will fit under the stock TC cover?

Thanks everybody for the discussion. noobe here trying to learn as I go.

rdicarlo

So what do you guys think of this combination of parts for the c4? The Lunati cam specs are listed above.

http://www.camshaftwarehouse.com/Pro...0-VOODOO-.aspx

http://www.camshaftwarehouse.com/Pro...%9C-73943.aspx

http://www.camshaftwarehouse.com/Pro...S-FOR-SBC.aspx

http://www.streetsideauto.com/produc...3145&skip=True

http://www.streetsideauto.com/produc...0239&skip=True

Hopefully, I can find a good deal on a used hi-flo intake manifold before the install starts in spring.

Thanks,
Rob

bjankuski

I agree, the ramps on the hotcam, which was designed by GM for use with 1.6 rockers, are more intense then the ZZ4 cam. There is no issue with the ZZ4 and 1.6 rockers, provided you use the correct spring.