Vendor Competition Cams
Product Line Competition Cams Xtreme Energy Camshafts
Cam Style Hydraulic roller tappet
Basic Operating RPM Range 1,600-5,400 RPM
Intake Duration 050 inch Lift 218
Exhaust Duration 050 inch Lift 224
Advertised Intake Duration 270
Advertised Exhaust Duration 276
Intake Valve Lift with Factory Rocker Arm Ratio 0.495
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.502
Lobe Separation (degrees) 110


see my mods below.. car is used about 2-3 times a week.

right now, the cam i have is from a 93 LT1.. here are specs on it

lift: .451/.450
duration: 205/207
Lobe: 117

my car is speed density.. yes i know i need to reburn a new chip

 

i thought you needed 112 lobe sep 4 the tpi. all else seems ok

 

i thought that too.. when i asked him, he said it should be fine with it..


are they crazy?

 

hmmmmmmmmm did you lok up 2 spots theres a thread on zz4

 

uh.. what? im not seeing a ZZ4 thread.. nor is it up "2 spots"..

 

sorrry try tpi section ... look under new threads ....

 

Have you tried cranecams.com? They have a program that allows you to enter all the details about your vehicle. I haven't used it so I don't know if it gives you an instant answer (there's a lot of info to add), or if someone calls you back, or if you get an e-mail.

You may want to check it out.

 

Normally I would not listen to Summit, unless I had a carbuerator on my engine. But, yes the 110 lobe is a bit tight for a S/D TPI. Nothing that a properly tuned prom cant fix. ...Tom

 

yeah the 110 with SD is a NO NO... not going with that cam.. need 112 minimum.

so i think im going either with the LT4 HOT cam or ZZ9.. big difference in price though.. i think that might be the deciding factor.

 

What a timely question on Lobe Seperation Angle. I had a cam installed in my new 5.0 litre engine and after consulting with the experts on this board they said the LSA was a little questionable. See the thread I started entitled "TPI Runners", I will bring it forward to cross referance to this thread. So I decided to contact Comp Cams and ask their advise. This is their response:

Raymond,

If you have had someone, as you said, do some custom tuning to the computer
then I see no problem with this camshaft. Most cases I would recommend a
camshaft with the same profile, except I would have recommended one to you with
a bit wider lobe separation, for example: 112 or 114. This is do to the fuel
injection. If you use a camshaft that has to much over lap the engine will
generally have problems idling properly. However, a lot of people are able to
tune the problem out.

Thanks, Sam

"Raymond (by way of Comp Cams )" wrote:

> Dear Sir:
>
> Recently, I had my mechanic install one of your cam shafts in my car when a
> new engine was installed. At that time I opted for a cam which would give
> me some more power while still running smooth. The cam shaft is Part #
> 08-408--8. At the time I did not know much about cam shafts; however, I
> have been doing some research on them. Was this a good cam shaft? How
> much improvement over the OEM cam shaft does it provided?
>
> I am the original owner of a 1989 Trans Am GTA 5.0 litre TPI engine with a
> 5-speed manual transmission. At the time I had a rebuilt replacement 5.0
> litre engine from GM installed. Heddman Hedders were installed and the
> catalytic converters were removed with an improved exhaust system
> installed. I plan on porting the plenum, installing an adjustable fuel
> pressure regulator, new fuel injectors and a custom PROM chip.
>
> Any information or recommendations in association with your product is much
> appreciated. Thank you for your information.
>
> Raymond

While it seems my cam is suitable for my car I wished I had consulted with all the knowledgeable people here at Third Gen before I put in a new engine with all the performance upgrades. I may have done a few things differently. By the way I found a really good page on the Holley site which explains all the technical specifications of cams.