F/2F engine Performance cylinder head

[drowe57]

I have seen a couple of videos where they talk about getting a performance cylinder head rebuild for the F/2F engine with oversized valves. Does anyone here have experience with that? I have a spare head that I was thinking about swapping for the one that is on my rig now.

 

[charliemeyer007]

Bigger/better valves with hardened seats might be a good fix for a damaged head. But the full treatment balanced and blueprinted, cam, pistons etc. is where the actual power is. There is a youtube vid of a Ford 300 straight six hopped up $$$.

 

[rlong]

You need to do at least all of induction, "head, cam, carb and exhaust" in combination even if you only want to do "top end" (AND be cognasant of your compression ratio). If not done together the benefit is limited and you may actually decrease drivabiltiy. I have not done head/cam on a landcruiser, but as kids (Lots of V8's and a slant 6) we often kept trying "one or two of the induction components" and were disapointed with performance increase and decreased "drivability".

But it would be a fun project! Just research more and make a comprehensive plan. Think of head and cam as a "set". (I'd do EFI.. shshsh)

Bob in CO

 

[Pighead]

Does anyone here have experience with that?

Funny you should ask. I'm just finishing up a valve job on a Late F head with LS valves and a bit of porting and polishing. Still tuning it a bit to get it to run right.

 

[drowe57]

Funny you should ask. I'm just finishing up a valve job on a Late F head with LS valves and a bit of porting and polishing. Still tuning it a bit to get it to run right.

View attachment 3645907

I'd like to hear some details on what you've done. I do not have the skills or equipment to do the work myself, but I'd like to be able to have a good discussion with any machine shop I take the head to.

 

[Pighead]

I'd like to hear some details on what you've done.

OK. I first built this engine 20 years ago. early 2F block, Late F head, bored , balanced, RV cam, Downey headers, wide runner intake, 60 series dizzy, 10/'73 carb.
The head just got a routine valve job and a "Bowl Job". so I've been promising it a good valve job for the last 10 years.
So I took the head to my local machine shop (there's only one). Machinist did all the usual stuff, checking and shaving and truing and stuff.
I told him I wanted the slightly larger cheby valves and some nice port matching and polishing. He ordered 18-02056132 and 17-00321750, that's what's on the invoice. He had to machine down the valve stem seal bosses on the head to accept the cheby valve stem seals

 

[drowe57]

OK. I first built this engine 20 years ago. early 2F block, Late F head, bored , balanced, RV cam, Downey headers, wide runner intake, 60 series dizzy, 10/'73 carb.
The head just got a routine valve job and a "Bowl Job". so I've been promising it a good valve job for the last 10 years.
So I took the head to my local machine shop (there's only one). Machinist did all the usual stuff, checking and shaving and truing and stuff.
I told him I wanted the slightly larger cheby valves and some nice port matching and polishing. He ordered 18-02056132 and 17-00321750, that's what's on the invoice. He had to machine down the valve stem seal bosses on the head to accept the cheby valve stem seals

View attachment 3646187

View attachment 3646188

View attachment 3646189

Perfect. Thank you.

 

[1911]

As others have said, hot-rodding a motor needs to be a total package deal, including the cam timing, to get any real benefit.

On the valves specifically, there is an advantage in longevity to using current metallurgy/technology, i.e. stainless steel chevy/LS valves. If you have to use a little bit larger valve sizes to get these to fit then OK, but in general large valves and more efficient intake and exhaust (porting, headers, etc.) are mostly going to benefit an engine tuned for max hp at high rpm's. The F-series motors were designed for good torque at low rpm; one of the (many) ways to achieve this is using modest (smallish) valve sizes and conservative cam timing. Modest valve lift from the cam will also increase the service life, another worthy goal of the original design.

Short story: Just throwing larger valves in without a different cam and a lot of other work is going to decrease the drivability and usefulness of an F-series motor for its intended purpose.