The damage recently done

[69Cobra]

If I'm thinking right. The PI intake is the same casting as the CJ intake except it is aluminum instead of cast iron. Basically the only advantage is the difference in weight between the iron and aluminum. It's not going to make any more power than the CJ intake. But I'm sure the difference in weight is worth .20

[CycloneFE]

Originally Posted by 69Cobra

If I'm thinking right. The PI intake is the same casting as the CJ intake except it is aluminum instead of cast iron. Basically the only advantage is the difference in weight between the iron and aluminum. It's not going to make any more power than the CJ intake. But I'm sure the difference in weight is worth .20

Kris, you are correct. Here is some more history on the PI.

The aluminum PI intake is the same as a later-design of the 427MR intake. Early MR intakes had different throttle mount bosses and did not have the machined-in features that allowed fitting the three-fingered rocker oil control baffles used in all FEs (except the 427MR) from 1958-66, so to fit the 427MR intake to a non-427MR engine six extra cutouts at the pushrod holes needed to be machined into the aluminum intake. Note that all FEs would inherit the simpler 427MR rocker oil control baffles from 1967-76. By the time the 428PI was developed in 1966, the 427MR intake machining protocol added the extra counterbores to the intake, and also modified the throttle linkage bosses so the intake would work in both 427MR and 428PI applications. As for the penny-pinching part, the PI did not earn a special intake casting, but 1966 was the first year of both the of the Chrysler 440 and Ford 428, so it was clear some free breathing was in order. It made sense to install the MR aluminum intake onto the 428PI to keep competitive with the 440, even though the intake was not cheap to cast. It wasn't until the 428CJ was born that the accounting department saw a cost-benefit to designing a low-cost iron alternative to the MR intake, so about a month or so after the iron intake was being installed onto 428CJ engines, the 428PI engine lost the aluminum and gained the CJ iron intake, thus making the Ford a more profitable police vehicle.


Seems funny to me that in 1968 the CJ was slotted into the C/SA catagory and you will find it STILL there today. Sounds to me like there are little or no improvements other than just keeping up with the rest of the pack.

[Bart Kilraine]

1968 =335 H.P.......2012 =383 H.P.....Not quite the same weight for C/SA !

[Greg Hill]

Originally Posted by Bart Kilraine

1968 =335 H.P.......2012 =383 H.P.....Not quite the same weight for C/SA !

One of those over rated cj's ran 9.98 at Earlville in A/SA. Pretty impressive.

[Chris Kilraine]

Greg, is that first 9 sec A/SA pass?.......??

[Geerhead55]

Originally Posted by Chris Kilraine

Greg, is that first 9 sec A/SA pass?.......??

No Chris,,,, that honor goes to Bobby DeArmond,, '69 427 Camaro at Mission Raceway B.C. in May of 2001. That run is one of the highlights in the DVD "Four Days In May" that many on here have in their collections.
Danny Durham

[DonatoEng]

Does this make all of my old AMC race parts worth a bunch of $$$$$

[69Cobra]

Originally Posted by Geerhead55

No Chris,,,, that honor goes to Bobby DeArmond,, '69 427 Camaro at Mission Raceway B.C. in May of 2001. That run is one of the highlights in the DVD "Four Days In May" that many on here have in their collections.
Danny Durham

Yeah only 11 years behind... that's not bad

[Chris Kilraine]

Originally Posted by Geerhead55

No Chris,,,, that honor goes to Bobby DeArmond,, '69 427 Camaro at Mission Raceway B.C. in May of 2001. That run is one of the highlights in the DVD "Four Days In May" that many on here have in their collections.
Danny Durham

Yes...well aware. Pretty sure that was some sarcasim

[69Cobra]

Originally Posted by Greg Hill

One of those over rated cj's ran 9.98 at Earlville in A/SA. Pretty impressive.

Not really when you consider that Lance has arguably the fastest CJ in the country by a few tenths and I'm sure its got every bit of Pro Stock technology that he can use to get it there. 9.984 on an 11.00 index is only 1.016 under. Now if I could get one to run a second under then I would be impressed but you're talking about a guy who's brother is arguably the best engine builder/tuner in NHRA Pro Stock. I think this separates Lance from the rest of us.