Trying to decide if swapping heads is even worth the trouble. 550hp 6.0 that has lingenfelter CNC SS valve 243 heads. I have the option to swap to a set of TFS Gen X 225 heads in the same chamber size let's hear the opinions is it worth the swap, is there much to gain?

 

You already have the Lingenfelter 243's on the car?

 

yes and the TFS heads on the bench

 

Ok gotcha. In that case it might be worth it. I thought you were considering buying them, so this makes a big difference lol. What are the rest of your mods? The TFS heads are totally stock?

 

TFS heads are cnc runner and chambers with SS valves. Really nice heads. The 243's I have are built the same but I know the runner and chambers are suppose to be better on aftermarket heads 6.0 with BTR stage 3 cam, and a prototype plastic manifold comparable to a Fast 6500rpm max power set up

 

Better valve angles too. Likely a straighter shot to the valve as well.

I'd do it if I had both on the shelf. All it'll cost is some headgaskets. If you're paying someone to do it for you, then you'll have to be the judge.

 

Since you already have them is your possession I think it's definitely worth it. Might be worth another 20 hp or so, but those heads can support much more growth later on too

 

I agree


OP if you are using stock rocker stands you'll need to grind the tabs off the bottom for the TFS heads.

 

I would do it for 20hp. I ran them on another dyno engine with the rocker stand tabs cut and stock rockers I guess if I use the in the truck I'll need to pick up some roller rockers

 

You don't have to, you can use the stocks. But if you got the money why not. Don't short change the stockers though, they are excellent themselves. I would do the bushing trunion upgrade though, they bearing trunions come apart (OE) and the aftermarkets wear out super fast. Unless you wanna go super high lift, then switch to rollers.

20 is pheasable but nobody can guarantee it, unless you can find your exact two heads dynoed back to back on the same car, which you likely won't. 10 may be what you get, but 20 is likely, definitely not crazy to think so.


If you really want it to make max power go for adjustable roller rockers with low lash solid roller setup, you could get another 10-20 or so over the hydraulic lifters. But be prepared to open up that wallet some.

I know Brian Tooley sells a bowl blending on TFS heads, make sure yours already are before slapping them on.

 

With the right cam (LLSR),Mid-Length Runner Intake & RPM could be
Worth 50+ HP.

 

Have you dynoed it with the Lingenfelter heads? Being selfish i would like to see the difference in the graphs between the 2 heads.