Thread: what cam is best ?

Tweet

Originally posted by allmine69rs
well if he can help me then y is it that he had to talk about trying to impress the geeks down at the local drive in and all that shit i was jusst asking for advicxe if he is still on please i will listen i thought he was giving me shit about my ride

I apologize. Let's start again.
Why do you want the motor to idle roughly?

i bought the car off of my father he needed money and i wanted that car since i was old enough to know wut it was and wut it could be

tech" i apoligize too... now that, thats out of the way... i dont want anything extreme i just wanted a lil bit rougher idle to make it sound a lil bit better and for a lil bit more performance but if i cant do that without putting alot of money into my motor
(cause this motor only has 1,000 miles on it)then i think i just might stick with stock . you know what i mean ?

"wanted a lil bit rougher idle to make it sound a lil bit better"

OK, this is what I was trying to explain to you. You want a lumpy idle to impress other people, mainly the ones who don't have a clue that a lumpy idle DOES NOT mean that the car is fast.

A lumpy idle is the sound of the motor being inefficient. It's the mixture being blown back up the intake tract by the piston and disrupting the airflow through the carburetor venturis. If the airflow is disrupted, the carb CANNOT meter properly, so the motor idles improperly (lumpy).

In order to make a lumpy cam work, you will need more static compression ratio, a looser converter and a shorter rear gear.
If you install a long, lumpy cam in an otherwise stock motor, it will be slower than if was with the stock cam and it will be a pain in the ass to drive. That's what I was trying to explain to you.

If you do not plan to change the c.r., etc. and just want a little more power, call your favorite cam grinder and ask for a recommendation. They'll do that for you for free.

Originally posted by allmine69rs
well if he can help me then y is it that he had to talk about trying to impress the geeks down at the local drive in and all that shit i was jusst asking for advicxe if he is still on please i will listen i thought he was giving me shit about my ride

Two small points. Your posts would be easier to read if you canned the Yahoo chatroom lingo (y, ur, etc.). No big deal to me, but it's hard for some folks to read. Second, there are other words that can easily be substituted for "s**t."

I completely agree with techinspector1 and henry rifle. A lumpy cam that is not augmented by increased compression ratio will result in a miserable drive. having a part that is made to operate at high rpms-without utilizing it at high RPMs, will result in a miserable drive. I dont think anyone here can give you an easy answer. do your homework, and check with the reps about your particular setup. But dont expect to go too radical without altering the internals to complement the cam. and as henry rifle said if you want it to just sound like it could stall at any second just mess with your A/F ratio until it barely idles- problem solved.

ok so just to sum it all up i wont be able to put a mild cam in my set up without doing other thigns to the motor well thank you for all the help and sorry for the misunderstanding.....

hey techinspector would it hurt me or help me if i put 5.0 ltr heads on my 5.7?...i've herard both i just want a more profesional opinion....

Originally posted by allmine69rs
hey techinspector would it hurt me or help me if i put 5.0 ltr heads on my 5.7?...i've herard both i just want a more profesional opinion....

It will raise your comp. ratio by going to the 305 heads.The bad thing is the intake valve is shrouded more.Tech. any thoughts on this?

No, you've covered it Erik. Thanks.

You might talk to Comp Cams or a dealer about their "Thumper" series. These cams have a great sound and a good performance boost while retaining plenty of vacuum. The manufacrurer can recommend one for your application.

Originally Posted by Henry Rifle

By the way, you can get a rough idle by messing with the fuel mixture. No need for a cam. Besides, you just slammed the guy who is the most able to provide you info.

The method most used by myself and other well informed 15-16 year old hot rod experts was to utilize a blown-out muffler and pull off a plug wire or two. It made my '39 Dodge four-door with a stock flathead six sound like a real bear.

Jim

What is this late model truck engine out of? and what year? First of all, I'm pretty sure if that's a Vortec engine you have, it is going to be a hydraulic roller cam stock. That means the engine has to be 1996 or newer. And correct me if I'm wrong but the engine should have around 9:1 compression on the late model vortec engines. GM Performance makes a "HOT" cam specifically for that engine. I would check it out. My friend put a '99 cadillac vortec in his '72 chevelle with a GM Hot cam in it and it sounded pretty good. A little lope, but not too much. But yes, you will eventually need to put a converter in there. Just save your money and do it.

Oh yeah, and keep your Vortec heads. They support 400hp stock. 305 heads are garbage.

the kid asks a question and all you have is neg comments inspector gaget. you dont list a car and your calling the kid a geek and dweeb.you sound like a beer drinking bench racer.what makes you the awser man read alot of hot magazines.