(SS)

iTrader: (1)

I'm kicking around the idea of redoing my topend and ditching my ported 317's for these TFS Genx 255's.Making sure i spend my hard earned money on the right heads.

HCI2000SS

iTrader: (2)

Why do those 317's suck that bad lol?

(SS)

iTrader: (1)

Just feel like i got more on the table with better flowing heads

Dynospeed

iTrader: (3)

We just installed our second set of them into my ctsv and the other was another v2. They picked up 25-30whp over ported stock lsa heads while they also relieved 2.5-3psi of boost and can take more timing. Since we are blower limited on these car they really were no able to shine. I'm hoping to get a set onto a new camaro with a whipple or something or a nitrous motor to really see what we can get out of them.

(SS)

iTrader: (1)

Thanks for the update

quik01ss

iTrader: (24)

Be the guinea pig (SS) I wanna see so I can follow lol or some tfs 245s

(SS)

iTrader: (1)

From what i'm reading my 408 might be on the small side for these heads.I will defiantly report if i do get them.Gotta get this A3 swap out the way first.

Silver408z

iTrader: (1)

You can definitely get better heads than 317's. I believe the 255's need a bigger bore than 4.030. Trickflow 235's would probably be a better fit.

quik01ss

iTrader: (24)

what im thinking also ^... the 245s and 255s have bigger valves and may get valve shroud

(SS)

iTrader: (1)

I was told 235's by allan futral(my tuner) and martin from tick(my cam spec'r)

http://www.trickflow.com/search.asp?...=KeywordSearch

JakeFusion

iTrader: (7)

The 255s are LS3 ports. They are a different beast all together than the 235/245.

I'd run the 235/245s on a 408, the 255s on a 418, and the 255s or LS7 heads on a 427. But the 255s will work on the smaller bores. The CSA is different because they are rectangle port LS3 heads. Actually, the 255s would be beastly on a 418. They flow 334 @ .500" and 363 @ .600"... yikes.

Dynospeed

iTrader: (3)

I know this isn't a huge help but I'm still pretty excited, its very rare a vehicle out does expectations. My V with the tfs 255's still doesn't have the 4.5 intake, 102mm tb, or post boost meth kit installed but out track opened this past weekend and on a 100 shot I got my 9.98 pass. I didn't expect to be able to run 9.9 without the other parts added. These heads really pick up on the nitrous over ported stock castings.

quik01ss

iTrader: (24)

https://ls1tech.com/forums/dynamomet...-tfs-235s.html

(SS)

iTrader: (1)

Impressive!
Tell me more about your setup.

fatmat80

Those V2's are an impressive platform. They never seem to disappoint especially on the 1320.. Great job op and congrats.. Also are u running flex fuel/e85 or 93 oct?

odarabla

iTrader: (1)

I have a 2002 Z28 with a 403ci LS2, EPS cam by Geoff Skinner, Ported Fast 90mm intake (ported by Thunder Racing), 90mm NW TB, Trick Flow 215cnc heads with 4" bore and 2.060 intake valves on the heads. car is a full weight 3540lb race weight. It has gone 10.39@130mph on the motor and 9.50@141mph on a 200 shot. Everyone including Futral, Brian Tooley all said these heads were to small for the CI motor I was building. Look at the times. Car makes right at 500rwhp through a 8" stalled th350 and a strange 12-bolt. Made 680rwhp on the juice. Trick flow heads work great. I would like to here what the pro's have to say. Could I make more HP with larger heads and a different cam and will the car be faster? IDK but the results looked pretty damn good to me..

Brian Tooley Racing

iTrader: (13)

Actually... the TFS LS3 255 heads are the only aftermarket square port heads made that use OEM quality powdered metal guides so stock rockers can truly be used without guide wear.

The standard TFS 235 heads and Mast heads have bronze guides and will suffer guide wear if used with stock rockers. Although the TFS heads can be ordered through TEA with powdered metal guides for an extra $125 so stock rockers can be used without guide wear.

Any aftermarket heads using bronze guides will suffer guide wear when used with stock rockers. If you retrofit stock GM castings with bronze guides they'll suffer guide wear with stock rockers also. Stock rockers scrub at high lift and will wear out bronze guides in 10K-20K miles.

odarabla

iTrader: (1)

Brian Please read the post above yours and tell me what you think.. I may be taking the engine back apart soon to go solid roller. Still think these heads won't work on a 400+ci engine?

Brian Tooley Racing

iTrader: (13)

I would never say they won't work. I understand how a Super Stock LS1 can run 9's with "stock" 205cc ports. With enough camshaft anything will run.

I will say they're not optimum, however just opening up the chambers to match the bore will help.

odarabla

iTrader: (1)

Ummm Ok. I did open up the bore to 4" and dropped in bigger intake valves. The motor that the heads are on is a 403ci pump gas LS2 that I am reving to a redline of 7500rpm at the moment. right now I shift at about 7000-7400rpm. I am planning on going solid roller with a carb setup. Do you think these heads will still be up for the job? Also with my current setup if I went to a set of 235cnc trickflow heads how much would you assume I would benefit? My cam isn't all the big either. It's a 246/255-613-632@113+2LSA

Thanks


Goeff Skinner with EPS speced the cam. On the dyno the car never really lost power all the way to redline. When we nailed the throttle it basically came right up to peak hp and carried that # over to redline (gaining or losing no more than 20hp). Geoff said he never saw that happen before. I figured it would make peak power low in the RPM range but that didn't happen either. All pulls were from about 4000rpm to the 7500rpm redline. Did the same thing on nitrous. Is that a product of using the smaller head?