376c5vette

iTrader: (28)

I was running an ls3 bottom end @ 10.6:1 compression with ported ls3/l92 heads by advanced induction and EPS 230/238 cam. I dynod about 465 rwhp thru an auto on a mustang dyno. full bolt on car, ls3 fast 102. 4000 stall. 373 gears. I was trying to chase down those last 35 horses so I went out and bought the new Trick Flow 255 ls3 heads and some Cometic .40 gaskets to bump compression. Had some transmission problems so I pulled the drivetrain and came across a good deal on an ls2 408 so I picked it up. So now Im wondering if I can get the 500 I seek using the new Trick flow 255 ls3 heads on the 408 or should I return them and go for a more proven head like a Tf 225 or 235. of course with a different cam to maximize power with the cathedral style head. And if I stay with the TF 255s, can I still use my 230/238 cam or would I be better off with a different cam for the added cubes?

376c5vette

iTrader: (28)

Compression on the new ls2 bottom end is 11:3 to 1 with stock 69cc chambers so im thinking with the 0.40 gasket and maybe a .020 mill, I will be high 11s in compression?

lil john

I have the same short-block 408 lq9......12.0 comp......solid roller...You should see 460- 490rwhp .. ..with the cam U already have..
The thing with the heads is that the 235 use the FAST intake to the Max...... where as the LS3 heads need more of I like to think CARB. style intake...Vic Jr. or Mast, the FAST intake is good but leaves a lot on the table once you get over .650 lift.I would keep the heads and cam and Just try'em OUT.....You may be closer to 500 than you think....that cam sounds good just to see what SHE'll do.....I went with MAST Small bore LS3 and a Vic Jr. set-up.............if you were to get a custom cam made with +2 to 12 deg. intake duration and 660 lift and a Manual trans 520-530rwhp would not be out of the ? Keep those heads....I had a pair but sold them to get all of my top-end stuff T/b...Vacuum Pump,injectors..etc and so now I'm buying heads again just went with Mast ls3 this time ...cheaper $949 ea. + tax.

lil john

Great engines all have great parts and a great plan of attack....Quote from: Comp Cams sells man on Horse Power TV.......Holla back, we're doing BQ for game-time. 3 hrs and counting.

376c5vette

iTrader: (28)

its a 113 lsa. and id have to go glance at the cam card to check the ICL.

376c5vette

iTrader: (28)

I m just wanting to do this right the first time. this car is no longer a daily and just purely for fun and to make power

87silverbullet

iTrader: (11)

You could of just put it on a Dynojet dyno and you would of got your 35 hp.

376c5vette

iTrader: (28)

ya. youre right.lol. But im using the same dyno to make the comparisons to prove to myself the mods im doing are working. I go to Pat G and Kurts dyno in victoria

376c5vette

iTrader: (28)

bump for any more info

ohioborn80

iTrader: (2)

I was told by few people when I was looking at heads that the TF 255 ws great on a bigger engine liek a 440. But anything less stick with a 235 or have Ai work my ls3 heads and mill them.

Canada

iTrader: (2)

Biggest head to fit that bore from TFS heads is a 235. Pick your heads and then build your cam around that and rest of car and maybe bump co press ion by milling heads. If you plan to run boost have TEA port them and then make them 6 bolt capable or 1/2" head studs.

jlrz28

iTrader: (7)

I am running the tfs215s and have had very good luck. Maybe 10hp more with the 225s.

crossbreed383

iTrader: (1)

Nevermind the supposed chamber issue with that size bore
The 245 head is the perfect cross section and volume size for that cubic inch.
They will do just fine on a 402.
And if you are really worried you can mill them or have Mike at TEA set the chamberup when they machine them,as the little youll lose in cfm(bore shrouding wise) will be hardly noticable when its all said and done
Listen to those who have done it before,and you will be pleasently surprised at how well they work
Good luck

376c5vette

iTrader: (28)

yeah I agree

quik01ss

iTrader: (24)

Tfs 235 or 245. I'm switching this winter to a set of advanced induction 235s .. up that baby cam too I wouldnt even run that in a 347. After that you should be plenty over 500rw

376c5vette

iTrader: (28)

Well it may seem like a baby cam compared to most cathedral port grinds, but most of the cam specialists I talk to say the ls3 favors a smaller cam and a bigger duration mostly just effects the driveability

quik01ss

iTrader: (24)

Yes if using a ls3 style square port head but I think the tfs 235s only come in cathedral port.

376c5vette

iTrader: (28)

yeah well I already have the trick flow 255 ls3s bolted on. just seeing if its worth going to a cathedral style head that may be more proven since these heads haven't been out too long

quik01ss

iTrader: (24)

Only one way to find out run it see what it does then if you're not happy I'm sure u can get rid of the 255s easily by trading or selling them

376c5vette

iTrader: (28)

Got the car running with the Trick flow 255s. It pulls good dont get me wrong with the baby cam but im looking for the best i can get and stay NA. ive narrowed it down to a few choices after talking with a few cam specialist

238/246 EPS CAM
234/251 EPS CAM
235/251 .638/.632 114+4
vengeance racing kaotik cam 235/244 .621 .624 113+2

please help. need to pull the trigger already and get my retune