About to cam my l98. Cam specs are 488 lift 292 duration. I was wondering what chip I should run?

 

WOW, just a little more information please. Mods, intake etc. Do you just want the cam for sounds or are you looking for a performance increase?

 

You will be a custom tune to get the most out of that cam..

 

That's alot of duration, what are your other mods?

 

k&n filter, cat back, going to port the plenum and going to be chip

 

If that's it, leave it be. See how it runs. Decide if you need a tune later. When you swap injectors and manifolds, then a tune will be more beneficial.

As it is you might only need an idle adjustment.

 

Now that I think about it how much lift are these heads good for?

 

I would do some other mods to the car before you chip it. If you run a new tune every time you put some new stuff on it, it's going to become a pain and even get a little expensive.
I would do;
Heads
port and polish
fuel injectors
fuel pump?
Maybe even get an over-sized TPi top end (summit racing has one I think...)
You know, the little more than basic stuff. You can do some stuff yourself and most of the parts (except for the new over-sized TPi intake system of course) are fairly inexpensive. Then, go ahead and get a CUSTOM tune from a Corvette specialty shops. Be careful with the tune by mail and definately don't touch the dealerships.

 

Whoa...watch that cam. I think the L98 had around 430 lift and the stock springs may be good to .480. I believe you're getting into spring bind with the cam you chose.

 

Need the rest of the specs on that cam. Sounds familiar of an old school grind that may be way too big for your TPI.
Dont cam these up like you would a carbd motor.

 

Oh, but Ron! It sounds like this guy knows what he's doing!




Don't MOST people put a big duration cam on a TPI w/o doing intake/exhaust manifolds, headers, injectors, etc????

 

And then not tune it!

 

I didn't have a computer when I was young, driving my first car and knew very little about how they worked. I believe that we all have been there at least once in our lives. In 1969 I thought it would be a good idea to put dual 4 barrels on a stock 289 Ford Fairlane 500. When I stomped the go pedal from a 20 MPH roll the car would fall on it's nose, slap my head on the steering wheel and get slower before it accelerated.......very slowly.

That was my second car. My first was a 1964 170 cu in Falcon. I tried to make it sound "badder" by ramming a screwdriver through the muffler. Well, all it did was whistle. I then ran two pieces of 1" conduit instead of the stock pipe and muffler. I KNOW for a fact that it sounded like a trumpet or a trombone and had no power. You could hear me coming for a mile.

My 1969 Charger R/T (3rd car) I put a new intake on it and a 1050CFM Holley 3 barrel carb on it. I also got it out of time when putting the distributor back in the new manifold. With the hood up and a friend madly pumping the gas it decided to finally fire. Boy, did it fire. A ball of fire about as big as a hot air balloon shot out of the carb, rolled across the open hood and chased me halfway down the block.

I'll give this OP the same benefit of the doubt and assume that he's not been there and done that with the refrigerator magnet and t-shirt to prove it. How many others have made bone headed mistakes like me?

 

Sorry if these are dumb questions. Im new to this tpi. If it was easy I would slap my 750 holley on her, heads and .520 cam and have fun lol

 

Just a cam laying around. $$$ is tight

 

I would wait. Free parts are great but there are certain things that my Motto of Upgrading (upgrade part A, break part B, upgrade part B, break part C, etc) doesn't work with. TPis tend to be a little temperamental. Do the whole valvetrain at the same time. Makes things easier.

 

What is cam duration at 0.050 ?

 

I would keep my eyes open for something like a Hotcam. Used cams like these can be had for little money on this site and other Vette sites..Try 3rd generation web site also..A used roller cam is usually fine and this size cam is great for the street ...WW


Specs for #24502586 Hot Camshaft

The duration at lash point in degrees (intake/exhaust) is 279/287; duration at .050" tappet lift (intake/exhaust) is 218/228; and maximum lift with 1.6 rocker ratio (intake/exhaust) is 525/525. Valve lash is zero/zero and lobe centerline is 112 degrees.lift 328/328

__________________

 

I still don't think this will work with stock springs. Even with 1.5 rockers the lift will be .492 or so.

 

I have a CC XF262 w/1:6 roller tips in my otherwise stock 86e.

Just a good tune and it runs great. The idle doesn't lope, but it sounds "Corvette Correct".
Great low/mid range. Falls off like a TPI should above 5K.