Justin421

Has anyone ever ran the TFS 245 LSX heads on a 4.030 bore motor with lots of nitrous? Preferably a 370 c.i. motor with the 3.622 stroke... Curious to how it would perform on nitrous... Thanks..

Justin421

Anyone???

87silverbullet

iTrader: (11)

It's only been an hour from you 1st post to your 2nd. People have jobs in the middle of the day its not easy for people just to answer right away.

Now to answer your question, I hope you would plan on running high compression and a solid roller cam to spin to the moon. It would be a dog down low and it would need nitrous no matter what to make it perform. That is alot of head for only 370 cubes.

Killer5.3

iTrader: (1)

TFS 225 would be a better choice. Get them from TEA with the nitrous exhaust port and you could do the LS3 valves turned down to lighten up the valvetrain if you want.

SinisterWS6

^Bump to that. Plus Tooley does have a nice Nitrous exhaust port.

Justin421

Brian Tooley is doing the 245 heads for me with the LS3 valves, and compression will be around 11.2 to 1 with a hyd. roller: .25x intake .27x exhaust duration at .050 with .647 lift and lots of spray...

Justin421

And he is doing the nitrous exhaust port...

Killer5.3

iTrader: (1)

So he recommended the 245 on that motor? If so then why ask? It must be a high compression, 8000+ rpm motor and 400+ of nitrous.

SinisterWS6

On what lobes? Just curious. Thats a lot of cam and some good sized heads for a pump gas friendly 370.

What are your goals for this if you don't mind my asking?

Bout'ItZ28

iTrader: (19)

It will work very well...head in king on a dope motor. Get the nitrous exhaust ports and a good option is the turned down ls3 valves because they are lighter. The nitrous is your torque at the hit. I would get with the engine builder or nitrous guru about a cam selection.

87silverbullet

iTrader: (11)

If you're getting the nitrous exhaust port done to the head, I don't understand why so much exhaust duration even with alot of nitrous. I also don't understand why such a small motor to spray a ton of nitrous on.

Plus that is alot of split for a cathedral head. A well flowing cylinder head doesn't need that much duration to evacuate the cylinder especially that little amount of cubes. I've been down the big head small cube nitrous route and its not fun. Nitrous was expensive then and its worse now. Having to refill a bottle evey 2 passes. My motor was 12.5:1 and had a little bit bigger cam then yours and ran on the spray but it also ran in my pockets. With using so much nitrous I was refreshing that motor often. The instant torque took its toll on the bearings and the valvetrain because of the rpm. I would never go that route again.

Its your money and setup. Let us know how it turns out.

ATVracr

iTrader: (5)

ALWAYS build the biggest motor your budget allows for nitrous.

Your welcome.

Roger Blackmore

I am in the process of working the bugs out of a TFS 245 with the TEA exhaust port. 408 with 13.5 compression and a solid roller. But I have not sprayed it yet. The 245 will have shrouding issues on a 4.03 bore, so it's not good as an na motor. But it is supposed to work well on the bottle. Hope to give some results in a few weeks. There is a guy on YB that ran this combination. His screen name is Crossbreed383.

James@ShorTuning

Just because it's a large runner head doesnt mean it wont run right on a smaller cube engine. What about the guys running LS3's? 376 11:1 with a 2.16" intake valve and 25x cc intake runners. Tell me now how or why a TFS245 with a smaller runner and smaller valve wont work...

I've talked to you about this setup and I think you are heading the right direction. Nitrous likes large un-restricted ports and I believe this will be a killer combo on or off the bottle!

As far as the camshaft goes I don't see Brian specing something that large for a 3.622 stroke engine with a large head. Something in the mid/upper 230's intake and upper 240's exhaust is all I would put in that engine unless it's a solid roller deal.

Justin421

Yeah Brian didnt spec the camshaft for this setup.. It was a custom grind from BES Racing for my 370 build with nitrous... Im hoping it will do okay with my heads on spray...

87silverbullet

iTrader: (11)

You might own a shop and do some tuning but this statement right here shows that you really need to do some research. You are talking about 2 different animals with reference to port shape, valve size, velocity of the port, and bore size. Its not just as simple to look at the runner and valve size. Stock vs cnc'd TFS is an unlevel playing field. 15 degree vs 13.5 degeree, again unlevel playing field.

Everbody knows an LS3 376 has a 4.065 bore which helps with unshrouding the valve unlike the OP having a 4.030 bore. So putting an LS3 head on his motor would not be a good comparison to a TFS 245.

Plus, have you even measured the cc of a TFS245? I have and you might be surprised.

James@ShorTuning

Don't know how I missed this. You prove some valid points but they still go in my favor. They also put those big heads on a 4" bore engine... Not only the LS3/L92 got the square heads. The TFS and LS3 heads I'm comparing are two totally different port shapes and runner designs however the TFS head will still shine over that LS3 head on a 4" bore engine with it's smaller valves. I have all the data for TFS heads... Tooley is 30mins up the road from me.

On this setup the heads will be fine especially with the big shot of gas he's gonna be running through it. I'm not so sure on the camshaft selection personally but maybe there is something to that cam that I don't know. It's worth a shot!

BLWN1

iTrader: (6)

Any updates?

Roger Blackmore

We have been spraying a 250 shot on mine with a very loose converter. Car averaged 5.8@118 in the 1/8. But it was flashing to 6k on the hit. W are trying a tighter converter and a bigger shot this weekend.

a98ws6

iTrader: (48)

At what weight?

Im interested in this thread as i have a solid roller 370 with TFS 235 heads and Super Vic. Going to spray 200-300. No cam selection yet...