Which will best fit my needs {ls6 cam} for more horse power?

 

243's will get you more power than any LS1 casting.

Edit: Or do you mean ported LS1 vs stock 243's. All else being equal a 243 will out perform a LS1 head.

 

ported ls1 vs stock 243

 

When I did my H/C/I I looked into the same thing and ended up getting my stock 241's ported. Local machine shop that has built a ton of killer motors did the work and they are great. I may be leaving a little on the table compaired to some of the top of the line ported ls6 style or ported 5.3's but not much.

 

how much $ did it cost (porting)?

 

im getting ready to do the same thing i just need some more info myself

 

it was just under a grand if I remember right, but I got a killer discount from the guy his normal price would have been around 1300

 

Ported LS1 heads will blow unported LS6 heads out of the water. LS6 heads flow around 260ish on the intake stock, quality ported LS1 heads flow 300.

Although if it was a budget and you had to pick between Ported LS1 heads & LS6 cam vs. Unported LS6 heads and nice 224/228 cam, I would pick the LS6 heads & cam combo.

 

Stock LS6 heads (243 castings actually) with the correct valve job and the correct cam will do a surprisingly good job and blow some ported heads away. Hard to believe, isn't it? Remember that it is the right combination that is important.

Ya' just have to talk to the right folks about getting the parts and work done.

 

agreed..most of your gains from "porting"actually occur about an inch or less below the valve seat,at least on LS style heads
and remember guys,it's not just about X amount of cfm a port flows,it's about the quality of airflow thru the port that makes power..don't think just because a port flows 300cfm it's going rock..
you can do things to increase cfm on a flowbench that will,in a running engine,actually hurt power..just something to think about..

 

But... to be practical and cost effective CNC machined ported LS6 225 Stage II heads would be your heads of choice considering the low cost of Patriot Performance fully assembled heads. Do the math and compare costs.

If you have a stack of bills in your hands then ETP's 225's can't be beat, but they require some blue printing due to angle configuration. Trick Flows and AFR's are not far behind at all, AFR's being a true bolt on.

To be honest about it, the wise thing to do would be to have your heads and cam properly matched if you really want to play in the big game. For that purpose a call to Ed Curtis at Flowtech Induction is the way to go.

 

The PRC Stage 2.5 5.3l heads have proven time & time again that they're the leader in bang for the buck cylinder heads. I have dyno sheets your welcome to check over that compares several different head combos with smaller camshafts. Unfortunately I haven't tested them on a camshaft as small as the LS6, but the dyno sheets should still help you in selecting the perfect head for your combo. The good thing is we can do some extra milling for a compression bump free of charge. With a camshaft as small as the LS6 cam you might as well use some of that p/v for extra compression!

 

 

When can i see them?