lt1773

iTrader: (1)

Hi guys

i need your advice/opinion on building 416 cu with one of these heads:

Trick flow 245cc heads & PRC LS7small bore heads

Till now i did not any good result out of TFS 245 but i have seen good result out of PRC LS7 small bore heads (602 rwhp)
here is my combo:

-LS3 416ci, (built for the boost)
-Garret GT-91 Turbo .
-LS9 cylinder head gaskets.

Let me know your opinion which one to go with .
thanks in advance

lt1773

iTrader: (1)

no one !!!!

Sales@Tick

iTrader: (3)

We use the TFS heads nearly exclusively here at Tick Performance.

That being said PRC makes a good product as well.

I am most likely going to be using the 245 TFS heads on my 408 high compression nitrous motor.

lt1773

iTrader: (1)

So do you recommend them over PRC in term of performance hp in N/A motor ?

Sales2@Texas-speed

iTrader: (5)

What is this being built to do? For a race application, the TFS 245's will not hang with the PRC small-bore LS7's. For average power, a street driver, the TFS will make slightly better and be better on the low-end and mid-range. If you're looking at the bottom-end and mid-range though, we'd recommend you check out the PRC 247cc cathedral port heads and make that a fair fight/comparison with the TFS 245's

lt1773

iTrader: (1)

its built for race.

LS3 416ci
-(Callies 4.0" compstar crankshaft , callies 6.125" rods, Wisco dish pistons)
-Intake manifold will be single plane with 4500 tb .

-Garret GT-91 Turbo

Sales@Tick

iTrader: (3)

There are plenty of guys using TFS in race only applications that are going plenty fast, to say one isn't good for a race only set-up is misleading.

Several noted drag radial racers in our area use them one being in RS275 that holds the E.T. record in that class with a set of 245 TEA TFS.

I am using the TFS 245's in my 408 13.5:1 nitrous motor build, as I think they are the best option out there for someone building a motor as such, and the main reason I'm not using a head like yours is because of a stupid valve angle rule.

Your heads are bad *** no doubt and they are on par with all the others out there, but to say one is better in a race only application and the other isn't is misleading.

Sales@Tick

iTrader: (3)

They both offer nearly the same flow numbers at peak lift and differ only slightly in mid lift and low lift numbers with the TFS edging them out on intake only slightly in those areas.

The main advantage to the TFS I see is the exhaust port flow with the N2O exhaust port.

Sales2@Texas-speed

iTrader: (5)

I'm saying there is no contest between the PRC small-bore LS7's and TFS 245's. The only down side is they are still LS7's, still have big runners, and still want RPM, which makes them more suited for a race-oriented (WOT) combo. At WOT with some RPM behind them, there simply is no competition between these two heads. Nothing misleading there! "Diet Coke" on this forum runs them on his stroker and has made great power, which can be street driven I believe.

If you want to compare a smaller runner cathedral head and how they perform at lower RPM, part throttle, street driving scenarios...compare the PRC cathedral heads to the TFS offerings. Check out their exhaust flow without a pipe, which is how the PRC's are flowed for advertising numbers. They are in the same playing field there too.

Sales@Tick

iTrader: (3)

I agree that a bigger port will want more RPM which is in most cases more suited to a race oriented set-up. Also that a rectangle port(LS7 in this case) vs. a cathedral port isn't apples to apples which you were pointing out and it seems some people think nowadays that you have to have a LS7 or LS3 port on a race set-up because cathedrals wont flow enough to make good power which isn't the case all the time especially for a head like the TFS 245's or 265's which can flow up to and over 400cfm with a good porter involved.

The with a pipe without a pipe has and always will be a opinion and each company seems to have their own view on how to advertise those numbers.

I think they should all be advertised with a pipe because your not going to run the heads without a header attached to them of course so that will give you the most real world idea of what the exhaust port can flow IMO. I'm fully aware of what they flow without a pipe also and without the N2O exhaust port they are nearly identical, but that N2O exhaust port option is hard to beat when applied and is only a 50 dollar option that adds nearly 25-30cfm to the flow of the exhaust port.

All that said I would put my set of modified 245's up against any aftermarket inline valve rectangle port out there of similar intake runner size. Now that being said they have some tricks and certain modifications done to them that the normal TEA heads don't have, but 370cfm and 297cfm ain't too shabby if you ask me

Didn't mean to step on your toes Matt or try to, just stating my opinion also which in my opinion your LS7 heads are very nice and I would run them on my car if there wasn't a valve angle rule in the class I run in or a no LS7 head rule(wussies if you ask me!)

lt1773

iTrader: (1)

but when it comes to how much i have to pay to run them then:

PRC ls7 small bore=$2700+($190) Gm Ls7 rocker arms =$2890
TFS 245=$2600+ yell terra rocker arms ($450)= $3050 or 3100 which is more expensive that PRC

mike c.

iTrader: (1)

You get what you payfor....period. Me and a bud both have tfs heads on our cars and have great luck with them.

TT427

iTrader: (1)

What about cost for induction?

gouldy

Big statement Matt, (TFS will not hang with the PRC) ??
It would probably carry a lot more weight if you demonstrated the Pro's and con's of each head and backed that up with flow figures, dyno sheets and track times.

I do like the look of your ls7 heads and your cathederal port heads however I chose to go with TEA/TFS 245s for my boosted 427 over the PRC because after many google sessions I could not find enough proven/demonstrated results for the PRC but I found plenty for the TFS.

Sales@Tick

iTrader: (3)

Harland Sharp has a shaft mount system for hydraulic rollers for the TFS heads that is 279.99 or 299.99 if I'm not mistaken.
I don't like cutting most of people's posts out when I quote them, but this is what caught my attention the most.

The PRC heads flow like a SOB, there is no doubt about that. It's a LS7 port so it's going to flow great anyways. They improved upon it even more and made it that much better. Good product for sure and I've asked several times if we could get a set or two of PRC's aftermarket small bore stuff here at our shop to no avail really.

The TFS on the other hand not only do we have tons of first hand experience with them here at our shop, but so do others. The head has been around for a long time and it just plain works. Again 360cfm out of a cathedral port head that flows nearly 300cfm on the exhaust with the N2O exhaust port is bad ***. I don't think you will find any LS7 or LS3 head that has near the I/E % that the TFS heads do and in a power adder or all-out race set-up I/E% is key not just intake flow numbers.

PRC makes a bad *** head for sure and I can't wait to see someone bring a set to our shop or we buy a set for a customer and see what they do!

lt1773

iTrader: (1)

I just found this link for PRC LS7 small bore heads

429Cu
LS3 block (4.125' crank,k1 rods ,wisco pistons 4.070')
PRC LS7 small bore heads
Fast 102/102
4L80

https://ls1tech.com/forums/dynamomet...ic-intake.html

VS

TFS 245 (see the cubic inch Vs Rwhp )

this is first result i see PRC does over 600 Rwhp but to be honest i never seen any result out of TFS 245 more than 575 Rwhp N/A

gouldy

There are lots of TFS 245 examples on this forum that have 600 and a number of TFS 235 as well. If I was on my pc and not my iPhone I would put some links up for you mate.
I found a lot of TFS results on other forums as well but I struggled to find results for the PRC LS7s, maybe in time we will see duplicated results for these heads but until then there is always going to be skeptics and it is probably going to be up to the manufacturer to support their claims with more proof than just flow numbers.

bBody22

how much compression are u going to have

Sales@Tick

iTrader: (3)

Close to 14:1, in between 13.5:1 and 14:1.

I'll be putting a 300-450hp shot of nitrous on top of that so stay tuned for results.

TXZ28LS1

iTrader: (5)

You guys with these expensive *** heads need to start posting vids of your car in action. Enough of dyno sheets..