rrheads.com

The stock valves are fine if you do not wanna spend the money to upgrade. Simply put a back-cut on them to remove the lip and get a quality valve job. There really is no "black art" to porting these heads, just take your time and do not change the shape of the port if you are not familiar with flow dynamics.
I know that many different people have all kinds of things to say about porting, some of it true, some of it not. I have been doing it for several years now, and will admit that I do not know everything. But I do my own, and many others and have yet to use any aftermarket valves, and with a full weight 2000 SS, run 116mph with a auto and a "crappy" hotcam. So, before you spend all your money on something that may or may not make a difference, shop around and ask questions.
All your power IS a product of how well your heads work with your combo.
Take care.

98blackSS

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by rrheads.com:
<strong>The stock valves are fine if you do not wanna spend the money to upgrade. Simply put a back-cut on them to remove the lip and get a quality valve job. There really is no "black art" to porting these heads, just take your time and do not change the shape of the port if you are not familiar with flow dynamics.
I know that many different people have all kinds of things to say about porting, some of it true, some of it not. I have been doing it for several years now, and will admit that I do not know everything. But I do my own, and many others and have yet to use any aftermarket valves, and with a full weight 2000 SS, run 116mph with a auto and a "crappy" hotcam. So, before you spend all your money on something that may or may not make a difference, shop around and ask questions.
All your power IS a product of how well your heads work with your combo.
Take care.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I've heard very good things about your work and will probably be getting in touch with you soon about porting a set of spare heads. GregM referred me. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Closer_2001

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MyLS1Hauls:
<strong>Are you guys going to stay with stock valves? If you are, then 5.3L heads have smaller valves than stock 5.7L. I just bought a set of slightly used 5.7L heads to do a home port job on. I know a guy with a flow bench to do some testing. I've also taken notes on some of the pro-ported LS1 heads I've seen. I'll pay a machine shop to cut .030" off the head and have a 3 angle valve job done with the stock valves. We'll see what happens.

Brad</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">YES!!! Please post results. Use the late style 2001 Valves with the back-cut stems. Please post the flow numbers.

LunaticTA

Now see, this is what I like about this site, you step away from the computer for a day or two, and the topics achieve a life of their own.

Keep going guys, this is good stuff!!

Chuck

Jason99T/A

iTrader: (21)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Nine Ball:
<strong>Stock seats can handle a 2.02" intake and 1.55" exhaust valve. I'd recommend some Ferrea stainless valves.

</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Actually, Tony, the stock seats can take up to a 1.575" exhaust valve. 1.55" is stock. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

I have heard of people fitting 2.055/1.60 on stock seats, but you have to pay real close attention to the valvejob. Personally. the biggest I would go is 2.02/1.57 on the stock seats.

Matt98SS

most porters can make the head with that little stock 1.55 exhaust valve flow more than you will ever need. so its not really a concern. the shape/design of the valve is more important..some are gonna be better than others on these heads

MyLS1Hauls

iTrader: (2)

Originally posted by Coser_2001:
YES!!! Please post results. Use the late style 2001 Valves with the back-cut stems. Please post the flow numbers.

I was unaware that the 01 valves were any different. GM changed the valves in 99. The new ones aren't backcut, but just straight. The older ones were actually got fatter at the valve head area!