Trickflow Powerport 240 heads

[734406pk]

Here are some pics:

[734406pk]

The red tube shows the relocated oil feed passage for the rocker shaft. Sorry for the poor focus!!

[734406pk]

Forgot a pic of the combustion chamber:

[73440]

Lot more support for the rocker shaft.

Steel or titanium retainers?

[734406pk]

Yes there is much more support for the rocker shafts. I'm using the chrome-molly 7 degree retainers for a flat tappet hydraulic cam. The plan is to use either a Lunati Voodoo 704 or a Comp Cam XL High Lift, in the low .500's and around 280 deg advertised duration. I want to retain the six pack set up so I don't want to over-cam. It is tempting though....

[Chryco Psycho]

 

[cudabob496]

So, at what point, would the TF heads be under-cammed?

[734406pk]

So, at what point, would the TF heads be under-cammed?

Undercammed? I'm not sure what you mean. These Trick Flow heads outflow stock heads from .400" all the way to .600"  lift. This means that you can change your stock cylinder heads, use the same cam and see an improvement in power generally speaking of course...

[cudabob496]

only a 3 angle valve job??

[734406pk]

only a 3 angle valve job??

That's correct! 3 standard angles for valve contact position and the rest is CNC'd!

[cudabob496]

Undercammed? I'm not sure what you mean. These Trick Flow heads outflow stock heads from .400" all the way to .600"  lift. This means that you can change your stock cylinder heads, use the same cam and see an improvement in power generally speaking of course...

Guess I was under the impression that you could install higher flowing heads, but it was a waste of time if you
did not upgrade the cam as well?

[cudabob496]

only a 3 angle valve job??

Thought there was a significant benefit to go to something like a 7 angle valve job, that most performance heads had?

[734406pk]

Thought there was a significant benefit to go to something like a 7 angle valve job, that most performance heads had?

The 7 angle was used on "as cast" iron heads to blend the port for smoothing airflow etc. You can also "back-cut" the intake valve to take it to 9 angles I guess. Very labor intensive to say the least. These days with aluminum head castings and a CNC machine programmed to do the work, we get a superior product at a reasonable price.
It's not necessary to change the camshaft to gain horsepower with these heads but if you want take full advantage of the airflow potential, go for it! Just do your homework to match all components properly. Too much cam is not a good thing.