I'm gonna start this build in a couple Weeks I'm also gonna port the stock heads

 

yea I thought about it to. I cant make my mind up if I want to mess with this lt1 or swap for lsx . Its like a toss up you know. I already have a lt1 so could just build from there. Or buy ls motor trans all that probley be happier with lsx but more money time and work to have it .

 

I would run it on stock springs. You'll need to wind it to about 7k though.

XFI 292 would be even better

 

Heres my Hotcam with shorties
[youtube]_cA8wHUj_mc[/youtube]

 

I really like the 503 its not to loud and Chopy and it ain't no sleeper I'm gonna start pulling out the motor hopefully next week

 

It's a great cam for the $.

 

I can get a brand new one for $180 is that good?

 

That's a great price, if you dont mind can you pm where I might find it that price.
Thanks

 

This is probably isnt the right place to bring it up but im selling the comp 503 out of my car.

 

I've had great success running the 503. You'll enjoy it!

 

I have the 503 with ported heads. It's becoming almost the standard street build cam for LT1s.

 

Speedy what numbers are you making with this setup I'll be happy with like 340

 

What do you guys think about the GM 847

 

LOVE it. "OMG its old tech bla bla bla" So what?

You will need the supporting mods/hardware to REALLY take advantage of it but its been known to make some HP's.

 

What mods are recommended with this cam

 

I'm lookin at doin this same cam. Sounds awesome at idle. Now I'm seein the 3600 is recommended for stall. What's wrong with the 2500? I'm lookin for a list as well. Do to I'm not tryin to keep pullin the damn thing out for every mod I do. I know my list is Cam, lifters, springs, gaskets, headers, cat. I'm lookin at porting my manifold, and jumping to the 52mm TB. I got a hook up on a ram air cold air. (real one). I mean aside from the obvious fluids. Is there anything I'm missing? In time I plan to do more. But this is still my daily. Oh and of corse tuning.

 

I don't know. I never dynoed it and haven't taken it to the track yet. Hopefully that will happen this summer. Pulls well on the open road. Most people get 330-350rwp with the 503 and a very flat torque curve.

If I was to do it again I would go with the newer XFI cams designed for fuel injected cars. Lots of lope and power throughout the range.

Lots of graphs around of 503 and 847 setups. Like nascarnate326 says, 847 is a little older tech.