Gross valve lift (intake) .477 (exhaust) .472

Duration @ .006 tappet lift (intake) 252 (exhaust) 266

These specs are for cam installed

@ 109.0 Intake center line

Duration @ .050 (intake) 208 (exhaust) 217

Lobe Lift (intake).2980 (exhaust).2950

Lobe Separetion 113.0



Thanks in advance! Do I need a custom tune? Is this an alright cam? Part # 12-364-4 CompCam

 

So nobody can help me?

 

Most people are asleep, you'll get more responses tomorrow.

I'm not as knowledgable about cam selection as some of the more experienced engine builders around here, but that looks like a pretty mild cam. A tune always helps to maximize the performance of a cam, but I don't think the car would run that bad without one.

I assume this is an L98 car? You should provide more information so you get a more accurate answer - engine, other mods, etc.

 

I used a crane 2040 and it did not need a prom tune to run at all..it ran great..that being said a custom prom is always a good idea anyways.

Heres a link to it..I used it in my late 86.Its a mild cam...I included the specs below.

http://crane.carshopinc.com/product_...d/15916/114132

Part Number: 114132 Grind Number: POWERMAX 2040 (FORMERLY COMPUCAM 2040)
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1981 1987 CHEVROLET 8 GREAT FOR 305 HO, PERFORMANCE 350 TRUCKS AND TPI-EQUIPPED 350 ENGINES. GOOD MID AND TOP END TORQUE AND HP. AXLE RATIOS OF 3.73 OR NUMERICALLY HIGHER REQUIRED. AUTO OR 5- SPEED MANUAL. MUST USE ADJ. FUEL PRESSURE REGULATOR. (50 STATE LEGAL IN 81-87 267-400, CARB EQUIPPED CARS ONLY. C.A.R.B. E.O. D-225-25) BASIC RPM 2000-5000
Engine Size Configuration
267-350 C.I. V
Valve Setting: Intake .000 Exhaust .000 HOT
Lift: Intake @Cam 2934 @Valve 440 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 3027 @Valve 454
Rocker Arm Ratio 1.5
Cam Timing: --- @---
Lift: Opens Closes ADV Duration
Intake --- --- 270 °
Exhaust --- --- 276 °
Spring Requirements: Triple Dual Outer Inner
Part Number 99848
Loads Closed 105 LBS @ 1.700 or 1 45/64
Open 265 LBS @ 1.280

Recommended RPM range with matching components
Minimum RPM ---
Maximum RPM ---
Valve Float ---
Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake (4) ATDC 34 ABDC 109 210 °
Exhaust 47 BBDC (11) BTDC 119 216 °

 

Well the cam is already in the car! My other mods are probe forged pistons roller timing chain clevite rod berings 9.7 crompression ration with a .030 bore on the block! As for bolt ons I have a magnaflow cat cut air lid with k&n and TB bypass.

 

So...how does it run? I don't understand the question anymore.

And wow, that's low compression.

 

The car runs fine I think! The stock comression is 9.5 I think! Keep in mind this car is CA smog legal! Well I wanted to know if this performance setup would benifit from a tune? and about how much extra hp I can get. But I would still like to know how big or small my cam is!

 

Engine builder sugested that 9.7:1 is best for 91 octane! Car is daily driven to work and school!

 

If you want a faster answer, post when I'm on the forum. There is no tune needed for that cam.

RACE ON!!!

 

would 1.6 roller rockers make it more aggresive?

 

ttt

 

Make what more aggressive? What is IT? The higher ratio rocker arms will increase the valve lift. The real, the effective, duration from seat to seat remains virtually unchanged. You are likely to see a moderate, 10 - 15 HP increase.

RACE ON!!!

 

Thanks!

 

As CFI said, it should run fine on a stock tune being as it is a mild cam. If you want to squeeze every last bit out, have someone do some datalogging and spend $ome time with it. Your compression is fine with that cam.