Any new trick flow genx 255 numbers?
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Any new trick flow genx 255 numbers?
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.
#4
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.
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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.
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http://www.trickflow.com/search.asp?...=KeywordSearch
#11
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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.
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.
#12
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.
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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.
http://youtu.be/hRbn7eaSIIY
http://youtu.be/hRbn7eaSIIY
Tell me more about your setup.
#15
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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?
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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..
#17
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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.
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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.
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.
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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?
Last edited by odarabla; 03-17-2014 at 12:38 PM.