I have a 2000 built 2001 model F-150 with the 4.6L. I am wondering how to tell if my 2001 has the HPI 4.6L rather than the 220HP version. Any tips would be appreciated...thanks!!!

 

If you get a look at the casting numbers on the heads the letters PI will be cast into them.

Turn your front wheels all the way to right and take a peek into the wheel well on the passenger side. You should be able to see the casting #s towards the front. If they say PI like in the pic you got them.

Good luck.

 

Thanks man, but I thought they started using P.I. heads in 99? I'm talking about the 2001 4.6L that got another 11 HP from a factory intake change...???

 

PI Heads

1999 for the 5.4

2001 for the 4.6

Intake change in 2001 was to match up with the new heads.

 

I see thanks man...hopefully I have em...almost afraid to check.

 

Just checked, but I didn't notice a "PI". Is it the same for a 4.6?

 

Jackal, if you are interested in dicussing your 1715, please email. I've enabled email in my profile. Apparently, you have email disabled.

MSUdawg

 

Thank you Crewman!

- It appears the change for the 4.6 happened during the 2001 model year (going by Wikipedia). Do you think that is true?

- I have to replace my engine... I'm going with a Jasper. It appears the P.I. heads are the ones with the square intake ports on the Romeo version of the engine. I could not figure that out by the VIN number.

- I also need to change the intake manifold because the original is severely pitted (I am told it was due to long-life anti freeze that my local shop talked me into).

- Do you think the aftermarket Dorman 615-278 intake will fit either engine version (P.I. vs. non-P.I.)?

I'm going to try to send this ? to your email as well... as I need to move quickly. THANKS for all your great information!

 

You know that you are replying to a thread that hasn't been posted in for 10 years? Your chance of getting a response from that specific member isn't very good.

 

Sure it is.

My 08/2000 built 4.6 did in fact have PI heads, but not the new seats with integrated seat belts.

I am not familiar with the Dorman, but you may be even better off with the aftermarket is the casting is any better than stock. I spent HOURS gasket matching my al. intake to the TB, lower intake manifold, and heads. Sounds like w/e antifreeze you used didn't have a silica additive to prevent leaching. Good luck!