hi in from venezuela and we have a doutabout this thing? i need to put adjustable cam gear for my lt1 camaro z28, because i`ve a friend that has ws6 96 m6 and he mades a customed cam gear for his car because hi put the comp cam 503 and he said that cam need to adjust at 109 degrees, and i gonna put and hotcam and i don`t know what to do?

 

You don't need to offset the LT4 HOT cam, if that's what you are talking about. And the Opti causes a bit of a problem with timing when you offset the cam. The MSD Opti allows up to 7* of correction for cam offset. But the stocker does not.

Do you really mean he offset the 503 "at 109 degrees"..... ????? I don't think so.

 

i agree with Injuneer

 

yes!!!!!!! is really , my friend put ajustable gear cam, he has and lt1 with a comp cam 503 and he put it in 108 or 109 dregrees !!!!!!!! what you think about it??????

 

I think there is a language barrier, because we are obviously not talking about the same thing. You can't advance a cam 109 degrees.

 

yes he advance 109 degress the comp cam 503, because he made a custom timing change with adjustable gear cam on his lt1 and he can adjust the cam in his lt1, thats why he can adjust the cam in to 109 degrees

 

I have a friend who put his engine in backwards in order to have front-wheel drive.JMHO

 

But seriously----I'm not sure about the grind of the 503, but if the cam is ground to a specific degree of advanced timing, then if you install the cam straight up the cam will have been correctly installed, if in fact straight up is TDC. Otherwise, you would need to degree the cam after determining the TDC position, however, it is impossible to degree a cam at 109 degrees and have it work at all. JMHO

Anyone may tell me I am completely nuts on this and my feelings will not be hurt.

 

What we are saying is that you cannot advance or retard. a cam 109 degreese. It just wont run that way.

Now in spanish. Maby it will help break the language barrier.

Lo que tratamos de decir es que es imposible avanzar un árbol de levas 190 grados. El motor no correrá con tanto avance en el cronometraje de árbol de levas.

 

or no way ....

 

This is great. Arguing with Injuneer about how it's possible to advance a cam 109* and it still run.

 

Maybe he means he had the cam ground with a 109* lobe separation angle???

 

I think he means he installed the cam AT 109* ICL. I dont know what the cam calls for but lets say the proper ICL for that cam is 113*, maybe he means he made a custom timing chain(drilled it and used offset bushings) and advanced it to 109*. Not advanced it a total of 109* That I could see.

 

Why not just buy a custom grind and have it ground that way then?

 

most cams nowadays have +4* advance ground into them.

The manufacture will give you a spec for installing the cam. Most people just toss them in dot to dot and fire it up and never look back. For a stock motor thats probably ok. But if you actually degree the cam you will find that the intake center line should be installed at xxx degrees. But just putting it in dot to dot doesnt mean its installed at the correct position. You are setting your cam timing.

By advancing or retarding the cam you can get different resilts. Generally retarding the cam you will get more low end power and ascrifice top end. Advancing the cam will do just the opposite, increase top end but sacrifice bottom end tq.

As I sadi most cam manufactures already have taken this into consideration and have 4* advance ground into the cam. So all you have to do is put it in dot to dot and walk away. But you dont account for machine tollerances and different variables that can affect cam timing.

I think he is saying that he his buddy took a hot cam and installed it advanced to 109* intake center line. That doesnt mean much without knowing what the manufacture spec is. If the spec is 110 then he did do much. but if the spec is 113 and the cam already has 4* ground in then he just advanced it by *8 total.