Hey guys,
So I was doing an engine swap in my '78 F150 from 302 to 351W out of a mid 80's interceptor. My dad gave me a 4 barrel intake to run. Got time to throw it on and was totally different. With a little research, found out it was a marine style intake.

Here's where my questions begin. Are the windsor marine applications a better engine? I know a lot of marine applications came with higher flowing heads, true with windsors? Would I be better trying to hunt down a set of marine heads to run? Is there a difference in blocks? This is going on a trail truck. Thanks for the help in advance!

 

Not sure on the 351W but I did the 302 marine and found it had all stock internals it was a 220HP only good thing it had was 74 351W heads 1.84 1.54 valves with the larger intake port like the D0OE Heads have.. I was told the crank would be forged but it wasn't had brass freeze plugs..

 

The early 351W 4V marine intake is functionally identical to the C9OE car 4V intake, so some will say it's pretty good, others that it is junk. The later marine 4V intake is the same other than having 12 vs 16 bolts holding it to the heads.

The marine 351s used automotive engine parts mostly other than the intake and timing cover and camshaft. The marine camshaft is similar to the 1983-84 Mustang HO camshaft.

Could you elaborate on the "mid 80's interceptor"?

 

A mid '80's police interceptor was equipped with a 351 engine instead of the 302 most got, but I'm not sure if it was anything too special.. could have been just a plane old low compression 351 or it could have been a 351HO which has a better cam and 4bbl intake and carb. I have seen some of these old 351 Crown Vics with the variable venturi carb as well but that motor is also nothing more than a stock longblock.

A marine engine typically uses a regular production 351 shortblock but with GT40 heads, a marine grind cam which is also a good automotive RV grind, and marine specific intake and exhaust manifolds and water pump setup. These were often spec'd at 300+hp and that just goes to show what this motor is capable of with the right top end on it.

 

I thought he was talking about Interceptor boats:

Interceptor Performance Boats¦192 and 232 Bowriders

But they say "Since 1993...." so beats me.

 

Sorry for brief explanation. Heres the story I got from my dad on the engine. It came from my cousins husband. He claimed it came out of a mid '80s police car. He gave it to my dad claiming the engine was junk due to a knock. Dad and I starting pulling it apart and appon separating the trans and engine, we found loose torque converter bolts. Found the knock We fired it up on the ground for about 20 secs and ran GREAT! Took it home with me and threw it in my trail truck. Dad also sent home, what he thought to be rare car, 4 barrel intake. I went to install it and noticed I had 16 bolt holes like beanscoot stated(also to note that it had "L" shaped water jackets). This is where my previous question came from. Also to note, this engine had the variable venturi carb like conanski mentioned with the 2 barrel EGR cast aluminum intake.

In short words, I'm looking to squeeze a few more ponies out of the engine. Being we have the marine intake, should I look for a marine engine to steal parts from or just look for late 60's-early 70's heads? Can I block off the four extra holes and run the intake? Will I see any gains over the aluminum egr intake? Could this be a high output camshaft? if so, would I be better to run a 4x4 cam?

I got a few numbers if you guys are interested. Firing order is 1-3-7-2-6-5-4-8 and the vavle covers have a part number of d2je-6176-ca.

 

Well that's good to provide a part number, and the valve cover number refers to either the covers or the firing order sticker. The D2JE indicates a 1972 or later marine engine, so it would appear that the engine those valve covers were originally installed on is a marine one, not a cop car one.

Early heads (1969-74 or so) will fit the intake properly although later ones can be used with some modification to the intake.

How about posting the block casting number?

 

The 1969 and 1970 and maybe a few more years had 16 bolt intakes and L shaped
water passages. 40 years ago it was a popular upgrade to 289 and 302 engines to
install 351W heads on them.

 

Were is the block casting numbers on the 351's? I know the 460's castings are on the passenger side behind the motor mount.

What would it take to convert the intake to work on later heads? Would it be worth my time and/or money?

I went down to my dads shop today to look at the intake. It has D1JE-9425-BA on the top. That tells me its a '71 marine intake, correct? I alos have pics if it would help ID the intake.

 

The casting number on the cylinder block is directly above the starter motor.

 

sorry about the long response. I will try to get the casting numbers soon. Its going to be tough being the engine is in the truck.

 

Sometimes, if you're lucky, you can read the numbers with a mirror and flashlight without removing the starter.

 

The truck has a 2 or 3 inch body lift. They placed rubber mat in between the inner fenders and frame. Truck also has shorty headers. I'm hoping I'll be able to pull up the mat and get after it with some cleaner and elbow grease to find it!

 

 

I FINALLY got around to pulling the starter and checking the casting numbers. Here's what I got, E9AE. I know the first letter, in this case 'E', is the decade(so 80's) and '9' is the specific year. So I know that I have an '89 block but no idea about the rest. Can someone fill me in on the rest?! Is there a link or something saying what all the letters mean? Thanks in advance!!!!

EDIT: Should have done a Google search. Found all the info I wanted to know. '89 generic engine. To gather any further info I'm assuming the oil pan would have to come off... Anyone want to chime in with their $.02?