FSUNole17

iTrader: (18)

I don't want to spend a ton of money for a set of heads as my car is not a world-beater drag strip monster. I just want to get a decent upgrade from 241 heads on a budget. My question is basically a two-parter. If I had some stock 241 heads ported, what would my gains be on a ballpark scale? My mods are lid, ported TB, Headers, cutout, and a 214/220 .556/.558 116 cam on a 2002 Trans Am. I put down 385 RWHP with these mods stated above. The second part of my question is would slapping on a pair of stock 243 heads yield me any benefit over some ported 241 heads? Thanks!

Evans752

iTrader: (29)

Ive got stock 243 on my car and you can look at my numbers in my signiture. If I was going to buy aftermarket heads they would be the Trick Flow, but I guess all the aftermarket heads have there up and downs. The cars Ive put together from 241 to 243(stock ports) pick up 15 to 20 rwhp and around 2/10 in the 1/4 mile, can be bought used for very low good prices to.lol

93redBIRDman

iTrader: (9)

get the ported 241's. They will have a decent gain over stock 243's. However, you can pickup a pair of ported 243's for under a grand...

But to answer your question, yes you will see gains from ported 241's over stock 243's

PREDATOR-Z

Try some sponsors, like ported 243 LS2 casting stage 1 (stock valve), CNC ported from Patriot.
227 cc intake runners, 300cfm flow, with LS2 springs for less than $1K
That one IMO is best bang for buck and at least 20/25 rwhp.

ryansm1

iTrader: (8)

How would ported 241s compare to ported 243s flow-wise (trying to keep as many variables constant as possible)?

I understand the 243s are better, but I've never come across an answer to this question as everyone simply says, "just buy 243s."

A little off-topic, but still related. TTT for you, at least.

93redBIRDman

iTrader: (9)

^ the flow numbers and power output will be pretty close, but the 243's come out on top. Like i said, not by much though, when both prefessionally ported

AU N EGL

I disagree. My ported 241s were not even close the stock 243s. Ported 243s would be well worth the cost.

01 BERGER CAMARO SS

iTrader: (77)

^ who did your port work on the 241's? I had a set of 241 ported here locally and they flowed 293 on intake at a 600 lift. That with stock valves though. Ill look for the flow sheet the guy gave me.

93redBIRDman

iTrader: (9)

Yea man, if your STOCK 243's were better than well ported 241's then there was something wrong. Don't steer other peoples decisions wrong just because you didnt have the same outcomes as everyone else. From all the research I've done on this site, the 243's are better in ported form, but not by much...

cdoggy81

iTrader: (6)

Yes AU N EGL, who did the port work???

To answer your question with that small a cam & no LS6 or FAST 90 intake I would port your 241's. YES a ported set of 243's WILL flow more but with your setup you will give up some low end with those larger runners...

I say mill, port & get a valve job on your 241's & with the $$$ you save buy a used LS6 intake & make even more power!!!

PREDATOR-Z

^
The low end loss (if any) will be compensated by increase in compression

Justa Z

iTrader: (17)

i have ported 241 on my 408 motor with a .671 lift cam You can make the heads work very nice

gtrucks

Hi Guys I Have A Question , I Have A 5.3l Tr224/224 Cam , Fast Intake, And 241 Heads Knot Ported My Question Is Are The 241 Better Then My Stock 862 Heads? And Would The 241 Ported Be Better Than 862 Ported ??

Jason 98 TA

iTrader: (4)

You might look into the PRC stage 2.5 5.3l heads in your comparison. I have dyno sheets comparing our PRC 5.3l head with the Stage 1 LS6 heads & for the money the 5.3l head is really hard to beat. It made more power & torque than the standard valve LS6 head & a competitors 205cc cylinder head. The LS6 head when setup with larger valves really offers great power potential, but at a cost of nearly $250 more than the Stage 2.5 5.3l cylinder heads.

If your on a budget I might even have a few sets of dyno tested cylinder heads that we coul sell at a reduced price.

If you'd like dyno sheets comparing the different cylinder heads shoot me over a email & I'll fax them over to you!

gtrucks

OK MAN, CAN YOU SEND ME THE INFO

Jason 98 TA

iTrader: (4)

Here's a dyno sheet between the PRC 5.3l Stage 2.5, a competitors 205cc head @ 66cc, and the PRC prototype 215cc casting @ 61.5cc

gtrucks

How Much For Them,THE sets of dyno tested cylinder heads

PREDATOR-Z

Question, PRC 215cc 61.5 cc Chamber (11.0:1 SCR),
Why didn't you mill the 205s to 61.5cc (tested at 66cc, variance 4.5cc, .6 compression point less 10.4 SCR)
wouldn't that be more apples to apples?

.6 compression loss is ~ equal to 2.5% loss
525 (from graph) x .025 = ~ 13 hp (538 hp) which would put it at or above the PRC 215cc head with smaller runner

BTW there are only 2 heads with 205cc intake on the market, Edelbrock and AFR, which one was it?)

Jason 98 TA

iTrader: (4)

This was a out of the box comparison. If you want to get down to it the 5.3l head made 11hp better than the 205 head with only 3.5cc less chamber. So for 1200 you get a head that runs heads up with a 2200 casting.

For your tech data we removed 7.5cc's off a head in testing & it added 18hp.

Look for the PRC head to be tweaked further before it actually ships. This is by no means a finalized test. This was our first attempt & now the head will be tweaked before it goes into production.

I didn't expect some guys to like this data, but it basically says the same thing Brian @ TEA said in his head dyno comparions. As long as you buy a quality head you can get big power even at the $1200 stock casting level. Brian @ TEA found similar results with their 5.3l cnc ported head & it's a quality part as well.

Don't shoot the messenger Predator, atleast I'm giving people data from a real engine dyno & not guessing based off what I read...

Jason 98 TA

iTrader: (4)

I still have the heads from the dyno comparison Predator, if you'd like we can reproduce these results & mill the heads for you.

Please list all the things you need the 205 head to have modified to match the power of the $1200 5.3l stage 2.5 head. I'll be more than happy to do them for you.

Hopefully we can tweak this 215 head to get the 15hp gains over the 5.3l to carry out through the entire pull.
That being said the aftermarket casting stuff isn't for everyone. If your looking for all out power the PRC new casting, ET heads, & TFS heads will all do very well for max out power. The 5.3l stage 2.5 head will provide awesome power potential for half the price.

Hopefully when we get to production we'll be at the 2100 price range with these heads. The really great thing is the extra p/v allows guys to get the big compression they need to better use the larger camshafts!