RealLiveMD

iTrader: (1)

Any idea how much power can be made with patriot stage 3 heads, 224/224/112 cam lid and headers? I've made up my mind about the cam and now I see for an extra 16-1700, I can go ahead and have the heads installed. I hear the cam only is good for 390 rwhp with a good tune.

mcowart

iTrader: (4)

naw u can get more out of it..unless u have a auto..buddy of mine got over 400 with stock heads..

RealLiveMD

iTrader: (1)

So... that would be about 430 with heads?

TXZ28LS1

iTrader: (5)

thats what i dont understand!! it seems like everybody says go big, go big, but then on stock heads the little 224 puts just about as much rwhp and tq as a big cam? some guys with huge cams get like 370tq with a cam way bigger than a 224 but a 224 puts like the same tq or maybe slightly more?

Rescue Ranger

iTrader: (10)

I'm sure Gunnar from Patriot himself will tell you the S3 heads are far too large for your stock cube motor. You'll probably lose some power with those, or gain very little. Go with the Stage2 59cc and that 224 and you'll make the same power roughly that I do

RealLiveMD

iTrader: (1)

I saw exotic performance plus selling this pkg with heads and cam of choice for around $3600 installed. This is what prompted my question.

PREDATOR-Z

PP 243 castings stage 1 with 918 springs
TR 224/224, .563/.563 112 +4 will make over 400 rwhp with proper DCR and supporting mods (lid and headers).

zo6vetteman2003

iTrader: (1)

Some may have different experiences, but this is what I've seen on a stock Gen III block from experience, from what I have read, or seen.
A big cam with stock LS6 style heads and headers will usually top out on the dyno around SAE 425-436rwhp. You get to a point where you just can't flow anymore air through the heads just sitting on the dyno. An experienced tuner will leave you slightly rich, so some gain will be felt out on the open road. A head change will be needed at some point to support a big cam with alot of lift, but there are limits to cam selection without flycutting. On a 346ci., there are a few things to look for where bigger isn't always better. Valves. The stock size valves are more than sufficient on a 346ci. in terms of air velocity. Anything larger will sacrafice some flow velocity. A 215cc/80cc head is going to make alot of power on a 346ci. The heads can be taken further, polished and milled, but the D shaped exhaust port should be virtually left alone. You can blend the bowls, port the exhaust runners, but the D shaped exhaust outlet should be cleaned up only. This maintains good outlet velocity. I've seen guys port the heck out of the exhaust port, and wonder why torque falls on it's face.
The intake port cannot be big enough, Here is where bigger is better, as long as you have enough the fuel to support it, this is where power is made.

bsf

iTrader: (7)

Not everyone say "go big, go big".

JoeyGC5

iTrader: (24)

When the original Patriot stage 2's + MTI C2 cam out I made 428rwhp/405 tq with headers, x-pipe and slp loudmouth in my vette

Gunnar@Patriot

iTrader: (20)

The stage II head would be largest head to go with in this case. Our CNC ported 243's would also be a good choice. They are available for a slightly less price with the OEM 2.00"/1.55" valves. Either of these heads will be better for your combo that the stage III heads.

zo6vetteman2003

iTrader: (1)

Gunner is absolutely correct about the stage II, or CNC'd LS6 heads. Anything larger, you would be lugging around in the gears unless you were above 3500rpm. The 346ci. just doesn't have the displacement to support the stage III and you may be dissapointed on the torque number. A LS2 or 6.6L would be more my choice for a stage III @ est. 480rwhp/465rwt. A torque monster for sure.