What camshaft

[Ddhotbot]

Here's what I have so far Factory 4 barrel intake Holley 600 CFM I'm having the exhaust ports opened up on the heads what camshaft should I put in? Strictly a mild Street build

[69wannabe]

The XE268 comp cam is a good cam for a mild street build, you will have to replace the stock valve springs with new matching springs for the cam too....

[randy73]

Don't you have a 318?

[Ddhotbot]

Yes

[c00nhunterjoe]

Why are you only porting the exhaust? Why are you running a stock iron intake if you are looking for more power?

[Ddhotbot]

I probably said that wrong I'm having the exhaust smells inlarged up to the 360 size. I was told that the iron intake off of a 360 was good combined with a Holley 4-barrel

[PRH]

I think you'd get better responses if you listed what the car is, what you're trying to do, and all other pertinent info pertaining to your combo.

Aren't all "360" 4 bbl manifolds spread bore pattern?
Will you be using a spread bore carb?

If this is a your "first time" type build, I wouldn't try and be too tricky with the grinding on the heads.
It usually makes them worse instead of better.......and I can't think of any reason why you'd be making the ex ports bigger for a mild street 318.

[randy73]

Listen to him and start with putting EVERYTHING you would want to do and what you are looking for. Trust me, I asked a million questions before I started to rebuild my engine.

[Ddhotbot]

Go to BJ are racing.com and read the article on small head technology this is where I got my information on replacing only the exhaust valve. Please let me know what you think

[randy73]

I know what I read about moving air through the heads is done by increasing lift and/or bigger intake valves with porting of the heads in various ways. I would im PRH and talk to him directly, I know he was a big help to me when I called him.

[Ddhotbot]

I apologize the car is a 1973 Dodge Charger with a 318 it has 60,000 original miles on it's in excellent condition I would like to keep it as Factory as possible. I would also like to soup it up just a little bit to wake up that 3:18

[randy73]

What rearend do you have, the 2.76?

Change to a 3.23 if you have the 2.76 and that will wake it up some.