I just accuired a 428 for my truck. I have a 79 f150 4x4 c6 tanker. The 428 came with an 390 police interceptor intake? BUt I will be getting my edelbrock rpm shortly. I have a set of ported d2te heads wo/air crap. The engine has a crappy melling cam in it and I would like to replace it. I want something that will produce very good lowend power and torque. I do drive my truck like a racecar though.

I will be using a 670 holley and finally getting some headers.

police interceptor or rpm?
which cam?

 

The PI manifold is probably one of the best street manifolds there is for an FE.

 

yep, if you don't want it I'll take it........lol

 

Me too. I'd like to have one again for my '68 390 in my F250 CS.

 

At this point, I can only say good things about the RPM intake. My truck is quite streetable, yet obviously breathes well enough to make a lot of HP.

But, unlike these other guys, I don't have any experience with the PI intake. Sounds like you'd be fine with the PI intake if you already own it.

As for the cam, something around the crane 941 is probably the combo of streetable torque and good upper rpm breathing you're looking for. unless you're willing to switch to the 521 hydraulic roller I run. that's about a $1000 upgrade. but, it gives you big breathing room at higher revs to make the HP but still makes a decent streetable low rpm vacuum and idle and a very flat torque curve. in either case, you might want more carb.

See how this gets us in trouble..... $$$$$

 

Just a thought ?? Being how its going in your 4X4...I think I would stick with the PI intake....and since you allready have ported D2's ..I would check the Port size of the PI intake to the ported D2's and see how well the will match up?? Cause the PI is an early intake and the D2's being later heads..

I would go with the heads that more closely match the heads myself..a port match might have to be done regardless of which intake you use..and your going to need more Carb.... and as far as Cams go.... I had to be different..I went with the CompCams XE274H and Lifters...according to the Dyno Sim..at 2500rpm the TQ will around stock at about 378lbs....But at 3000rpm it will be making about 450lbs....and on up from there to 6000rpm...

But I guess some of the Crane cams are comparable...I just went to comp cause I have a Comp Cam in the big motor...and I know alot of guys who run them with great success..as do the guys in this forum with the Crane cams..

Plus the CompCam for the FE is a Specialty grind Cam...and it seems to build TQ real quick and still perform well at 6K...

Good Luck on your choice!!

Russ

 

good point!
I measured the intake 2.15-2.16 by 1.10. A stock d2te port is about 1.9, my ported are right about 2.13-2.16. I will open them up a tad more, the roof is maxed out to the gasket so that leaves the floor. I just don't think theres a lot of meat on the d2te floor. If you look in the water jacket you can see where the floor is.

 

Well the way I would do it is take and set the intake up on the head..and spray Dykem thru the ports to see where your at? Maybe you have allready done that?

I dont think? you'll hit water at .030" ? I dont know how far you have gone if any on the floor..

Keep me posted on what ya come up with..

Russ

 

well, I haven't done the dykem thing, honestly I don't even know about it. I have removed material from the floor of the ports, just how much i can't say. Like I was saying if a person looks through a water jacket hole you can see the adjacent port floor. It doesn't look like theres a lot more material to remove. The low riser heads, such as, the cj have much more material removed, but I was thinking it may be a different casting.

I got new seats after I ported the heads so I need to take of the lip were the bored for the seat inserts anyhow. I will remove about .05 more from the floor but thats it. That will give me a 2.18-2.21 port entry.

As for the intakes I wish I knew the rpm port size, maybe I will call summit or edelbrock to get the info. I was looking over the pi intake and its a nice piece. The bottom of the venturis are even rounded instead of 90 degrees like on other intakes. I don't like the narrow 1.10 width, all info lists them as bigger but I actually measured a couple of them.(digital caliper style)

I would normally just modify something like an intake to my liking but I think I will spare the police interceptor any porting. People tend to complain about it too much.

I still need to get out and verify the crank, instead of sitting here typing but whatever. The previous owner would go nuts if he found out I tore about a perfectly fine running engine, built 2 years ago. But hey, I gotta know what the heck I have!

 

Well from what I have seen the PI Intakes go for..(when they can be found) are some big bucks... If you sold that..I'am sure that would allow you too buy any Intake you wanted and have some change for a Steak and a beer!! LOL

Russ

 

well russ, its a kinda a funny story on police interceptor intake. I knew the guy was wanting to sell his 428 mainly because he blew 1 and 3 gear out of the tranny. I think he needs the money also. I was going about my life. I was looking for a new intake for the old 390. I had 4 in mind cj,pi,rpm,bt. I saw some 428pi on ebay and one with $475, the reserve was not met on it. And with the 300-350 price I have seen for used 428 cranks, I thought what the hell and called him up and asked again if he had the pi intake and yes, so I said I'll buy it.

It turned out it wasn't the 428pi intake but a 390 pi intake? The reason I put the question mark is I don't know if there was a 352 pi engine. Forgive me my FE history isn't quite the best.

IT also came with a set of cal custom valve covers, i also have a set of MT covers laying around.

 

Well to answer one of your questions..Yes there was a 352 PI motor.. I think they were 1958 thru 1960? If I'am not mistaken? well sounds like you scored Bro!!

Thats great!!

Russ

 

nice talkin to you Russ!

I read earlier you thought the 274ex cam would be a good choice, I was looking and happen to like the one, one sizer smaller 262ex. I like smaller cams more than about anyone I know, I just hate pigs created by holding the valve open to long. I am even thinking about using the 901. The 901 is better to 2500 than the 262ex is better and since I plan on 5000rpm max it is spilt both ways.

I would rather have the 262ex but I have a low mileage 901 in my 390 that I am pulling anyways.

The 274ex is a 25-30 peak hp boost over both smaller cams.

I am open to any cam suggestions though!

 

I think the manifold your talking about is the same as I have, they also used them thru 1963 on 352 390 406 with port size of 1.16 x 2.14..they were made in cast iron and aluminum versions

 

Hiball I'm not sure but I think so! There is no casting number, the bore sizes are 1.61 and 1.71. I was told it was a police interceptor intake and I saw an identical one on ebay last week that was an pi.

I wonder if the hp and pi are the same intake or similar?