Hey guys, what a great day!!!!! Just came up with a 428 Police Interceptor aluminum factory intake!!!! I know the PI option made a lot more power then the Q code 428 in my T-bird so the question is, what other changes were there in the PI engine? Cam and compression I'm sure, but was there anything else unique to the PI engine that gave it such a huge horsepower increase? Or were the guys at Ford just fibbing a bit and under-rating the HP and Torque on the Q code engine????

(Not that a reputable company like Ford would have ever under-rated the horsepower numbers just to keep the front office and insurance companies happy!!!)

 

The "Q" 428 was rated at 345 hp@4600 and the PI was rated at 360 @ 5400. Both engines used the standard 390/428 heads. Some of the PI's were suppose to have mechanical cams but I never saw one or heard of anyone else that saw one. Most had the 390GT/428CJ cam. Then of course there was the aluminum intake.

 

Parts catalog sez only the 1963/65 390 P/C's had mechanical lifters, the block is 1963/65 only: C3AZ-6010-Y.

No mechanical lifters are listed for 67/70 428 P/C's, but are listed for 1966.

1966 428 P/C camshaft: C3AZ-6250-D ~ Marked: VB between last lobe and last journal.

The 1963/65 390's P/C cam is: C3AZ-6250-T ~ Marked: VAA.

The P/C engine code: P was used on the following: 1965/66 390 P/C; 1966/70 428 P/C; 1971/72 429 P/C.

btw: Ford never called these engines police interceptors in the parts catalogs, they were called P/C's = police cruisers.

 

The biggest difference is in the torque numbers, the PI is rated at 459 ft. lbs. at 3200 and the Q was rated at 362 ft. lbs. at 2800.---- Could the cam and PI intake account for that huge of a jump in torque, or was Ford doctoring the numbers....or is my source just a typo on the torque numbers??? I guess it's just hard for me to believe a cam and intake change was good for 97 ft. lbs. increase.... What am I missing????

 

I have the HP figures, but not the torque figures:

Q code rated at 345 HP / P code rated at 360 HP.

 

Without going off track too much, what are mechaincal lifters/cams?
Similar to a roller cam/lifters maybe?

gw

 

Mechaincal lifters or cams are solid lift cams, the lifters are not built up with oil like a hydrallic lifter they are just solid. The lift doesn't vary any it is always the same lift all the time.

 

Gotcha,
I've heard of solid lifters & cams, just never heard them referred to as mechanical.
Learned something new today.....

 

I pulled a 428 from a 66 Merc S-55 and put it into my F250.

The documentation I have for it shows: 345hp @ 4600 and 462 @ 2800 for torque.

Tim

 

Hi Dave!

There was a solid lifter 428PI. Not very many tho and some of these went into the 427 street Cobra's in 66 and 67 leftovers. They had the C6AE-R heads and cast exhaust manifolds. True that most were hyd lifter blocks like the 67 Shelby's used with the C7AE-A heads. I've been witness to one solid lifter PI block out of a 66 street car so some did exsist although rare. And I've never seen another. The PI engines in the Cobra's had a few tweeks and were listed at 390hp/475tq. The C3AZ-6250-D was indeed a solid lifter cam used from the earlier 427s. Comp ratio listed at 10.0:1. The 67 Shelby PI was rated at 355hp/420tq. These used the hyd GT/CJ cam. HP and TQ figures vary slightly depending on the source. I have 3 different listings for both PI's. So I guess it would depend on which version of the PI engine your comparing to and what source listed it. They are all fairly close tho.

Nice score on the PI intake Dave. Was this on the 428 in your bird? What heads are attached to that pup? BTW a 67 date code correct 428 is worth a fortune to the Shelby crowd these days. You could easily sell and get the 427 block and some other goodies you've been after. The PI intake alone is worth $750++ if in decent shape. The Cougar GT-E guys would be after that PI also if it's the C7-F casting.

Something else...if this engine is out of the car please look at the back of the block and tell me if there is a "S" hand made sandscratch. You'd be looking at 427 cyl walls and crossbolt bosses cast in if so.

G.

 

My book says the

"Q" motor is 345 @ 4600 and 462 @ 2800 and
the PI was 360 @ 5400 and 459 @ 3200 while
the CJ was 335 @ 5200 and 440 @ 3400.

Cam and intake would account for the differences easy.

 

Hmmm. Different specs on the Q code then I had... Thanks Bear! appreciate the help!

 

Thanks G. Still so dang busy on customer stuff that unfortunately the "Bird" is still sitting beside the shop untouched since I brought it home!!!! The PI intake wasn't on the Bird, friend of mine (bought my rollback couple years ago) discovered it in the trunk of a car he had hauled in. Whenever any rare or unusual Ford parts show up in his travels, I always get first shot at them. I won't even tell you what I paid for it, but it was very, very cheap!!!!!

I still would like to start with a Genesis block, have to see what sort of goodies I come up with to sell before I get started on a couple of my own projects this winter... I just need more time, better health, or some good help!!!!! Some other business considerations have surfaced now, so that is eating into my time, also..... Maybe next week???? I will let ya know what the Bird engine really is when I get it out. Want to do some modernizing on the induction and ignition, so some of the parts will be excess. You're the expert, so I'll give ya first shot on whatever I find... Thanks for all the help!!!!!