Isolde

iTrader: (4)

just an LM7 bored to 3.905", with a TR224 cam, 114 LSA, FAST intake, 1.75" long-tubes, TKO600 and 4.57:1 on 275/60R15 M/T DRs. Please debate the unported 243s versus TEA-ported 241s. This car will not be going to a bigger cam or more displacement in the future. And it's around 2900 pounds plus driver. Thanks.

black01_WS6

iTrader: (13)

what do the flow charts look like and whar RPM are you going to shift. The ls6 heads have longer runners for higher RPM, but I am willing to bet the 241's will out flow the 243's.

sciff5

iTrader: (1)

Anything that Tea ports is gonna be better than a stock casting. I would take 853 heads if they ported them over factory 243s

02*C5

iTrader: (1)

TEA is one of the top companies to work on stock casting model heads. I went with Lloyd Elliot stage2 and he has been around a very long time and trusted when it comes to porting heads. Yet the next set of heads I go with are going to be TEA's
My flow chart 241 heads the have Manley pro flow valves (2.02/1.60) and patriot gold extreme springs.
.200
144
109

.300
204
142

.400
243
177

.500
284
205

.600
305
219

.700
313
226

Isolde

iTrader: (4)

I'm not sure how the guy is gonna drive it, or how high he might shift it. I have a new set of 26918s for his engine, and a set of pushrods on order, I want it to survive 7000 rpm in case he's a dumba$$. The TEAs have the flow numbers, but how about driveability, in case this guy likes to lug the engine?

sciff5

iTrader: (1)

Great heads improve power everywhere. Its when you over cam it that you can run into driveability issues


But if the guy just lugs the car around.. no need to spend any money improving the performance of the stok engine

02*C5

iTrader: (1)

If this is not your first built and I am sure of that, you can get an idea of the guy just from talking to him. He is either a weekend warrior,street race, an idiot with too much money, or a Dumb$$ that is expecting a 9 sec car out a
head/cam built.

Either way ask him questions, I mean it seems stupid and basic but asking a few questions as in "what are you going to use the car for? How long have you had this car? what type of cars have you had? Is this your first build? I mean whats his experience?

Those questions should be basic when you are building a car for some one. It gives you an idea of a good build for him especially the experience question. I mean it seems stupid but really its the best "KISS" method:

Keep It Simple Stupid

Paint_It_Black

iTrader: (1)

ummm.. wtf are you talking about??

longer runners for higher rpms? I know those TPI engines were real high rpm screamers.. and someone better tell F1 they're doing it wrong! (study a bit on wave tuning, you're completely backwards)

longer runners in an LS6 head? they have the same entry and same exit locations, does the port do a loop-de-loop inside the head or something?

lol this kind of stuff is what you get when you build a car through the advice of an internet forum.. you get mismatched or sometimes just bad parts, claiming to make 450rwhp but goes out and can't break 120 in the 1/4.

wannafbody

iTrader: (2)

shorter runners= higher RPM range

BAMF

So what have some of you spent on having a good shop port your stock heads? I'm just trying to figure out if it's worth it for me to ship a set of heads to the states to be ported(there arn't good LS shops up here)by TEA or someone else.

garygnu65

243 heads have a bigger volume runner from factory than a stock 241 .

02*C5

iTrader: (1)

Dude i don't know what ur trying to accomplish but TEA is the best for the money the BEST I mean its not chemical engineering if there is no good LS head shops in your area then ship them. What ever your trying to accomplish you need to make sure that you tell them;

your cam specs
application (ie track, street/strip, daily driver)


There is a lot more that goes into choosing heads for your application but I just went through the 2 basic most important questions you need to know to choose the right heads.

Beaflag VonRathburg

iTrader: (176)

This thread is amusing. I'd take a CNC ported 241 casting from TEA over a factory as cast 243 head any day of the week.

mpe331lx

iTrader: (5)

I have been wondering this for a while: With both the 241 and the 243 ported to the max, does the 243 still produce more HP? Or do they pretty much have the same results once ported?

02*C5

iTrader: (1)

It all depends on the cam, tune, intake (manifold), exhaust (headers+X pipe), because if your heads are out flowing your cam(too big for your cam& application) and the 241 set up is spot on, the guy with the 241's is not only going to post bigger numbers but he'll drive around you all day and all night. People think just case your flowing 340+ intake and 270+ exhaust that you should be killing everything around town not so.

mpe331lx

iTrader: (5)

I understand that. But in a max\effort set up with both combos matched, will the 243 perform better? The reason that I'm asking is that I rarely see set ups with ported 243s. A lot of people seem to bolt them on stock (with bolt ons and a cam) and pretty much make "cam only" numbers or slightly better.

KCS

iTrader: (20)

243's have a better port, which the 241's/853's can't achieve unless you weld/add material onto the short turn. This helps make power where 241's/853's couldn't. For a street car, it probably doesn't even matter much anyways. On a real N/A race engine, this is absolutely crucial.

As far as ported 241's vs. as cast 243's, it all depends on who ported them. You could have some "head porter" with his "competition valvejob" put a head so far out in left field for the intended combination, you would be better off with stock castings. TEA seems to be a reputable shop, so I'd bet their 241's would be a good investment.

02*C5

iTrader: (1)

A lot of people think that the 243 is such a superb head, because they keep the valves, and they don't have to do anything else. That is wrong, if you did a good P&P job on those things with the right cam the HP gains are profoundly different specially if you go with the Ferrea valves (hollow). The 241's will end up choking the engine but again it depends on the set up and package. All equal the 243's will out flow and out power the 241's by a wide margin. Some of those 243's if done by a good shop will flow close to heads like FRP's @ half the price.

Gregorya24

iTrader: (13)

ive got advanced induction ported 241's

Isolde

iTrader: (4)

The guy finally came back home from wherever it is he goes, and I told him that since he didn't want to improve the combo in the future, the TEA 241s would be fine. So that is how this build will be finished. He's near retirement, and says he used to have an eleven second ride, also a '32 Ford, but that one had a real frame and body, not aftermarket copies. You can't have a conversation with him, he gives priority to whoever's on his cell phone. And I don't have that number, dammit! Anyway, he acknowledges that he shouldn't keep trying to go faster with his reflexes getting slower. I think he got these parts from some guy in a car club, or at a swap meet, but there didn't seem to be any serious issues, so I'm using everything he dropped off.