Hey guys, I'm new to this forum. I have just aquired a 75 f100 with a built 428cj.

My question is this, how much hp/tq will this engine have with the following mods?:

Bored to 4.170
Edelbrock performer cam
Edelbrock performer RPM aluminum heads
Edelbrock performer aluminum intake
Harlan aluminum roller rockers
Hooker headers (ceramic coated)
660 Thunder Series Carb
Full MSDS ignition
Don't know compression

 

Most claimed 428 CJ's turn out to be stock 390s.

 

Well if it is indeed built as you claim.. the extra bore is probably good for about 10hp over stock if the the same compressin was kept as stock ? the edhead cam No specs were given so thats a hard call..But if it the hydraulic cam I'am thinking of it not much better than a stock CJ cam from the factory.. The untouched RPM head run about 270cfm out of the box..So you lost some weight..But not really and cfm over stock CJ head as far as flow goes..the Performer intake isnt really anything but a aluminum cast stocker ford intake..roller rockers picked up a couple hp....as do the headers..ignition is ignition not really proved to pick up hp ..just make the engine run smoother and easier starts.. Not knowing the compression is a big deal...So just a WAG..I'd say maybe 400 to 425hp....Stock was around 400 to 410hp.. and maybe not even that ? as I see your under carbed...Stock CJ came with the 735cfm Holley....If I recall right..

Bear cut the guy some slack...He's a Newbie here !! Where's your manners ? LOL..You cranky Old ***** you !

 

Thank you RapidRuss. I understand that the only way to tell a 428 is to remove the frost plug and check for a stamp?
It does have a engine manfacture date of 3/69 though. If it turned out to be a 390 with the mods done wouldn't it still be around 400hp?
I will do a compression check and report.
Yeah, I think the former owner was running the smaller carb for mpg purposes. I have had a lot of luck in the past with Street Avenger 770's for other big blocks. Never had a Ford bb though. That should wake it up I would think though.

 

Well the only way your going to find out about the bore size, Is to pull a head... and a 390 block wont take a .120" over bore.... So is its found that its a built 69 car engine..and bore .030" to .060" Max.. It might be at another WAG a 375hp motor....again just a guess without knowing all the specs of the internal parts.. JMHO... Good Luck..Chime back in when you know more about the build..

 

If it is a CJ or any 428, why would you want to bore it .040 over right off the bat (unless somebody already hacked it .030)? At .040 it's pretty much at the end of it's life, the occasional block might go a little further, but you'll never notice any difference in power from that much bore, and it would probably actually run better with a smaller bore and thicker, stiffer cylinder walls. Old-time thinking when blocks were plentiful was to punch it .030 as it would always clean up there if it wasn't scored, but many times a very minimal overbore will clean it up, and a rare block is worth buying custom pistons for, allowing it to be rebuilt several more times. I sure hate finding 427 blocks that got punched .030 in the "old days"
Of course, every FE for sale is a 427 or 428, just like every 350 Chebbie is an LT-1, right? Look at the casting # between the two center exhaust ports, CJ heads for '69 would be C80E-N, and will have 4 bolts around each exhaust port.
Did you get the "manufacture date" from a tag bolted to the intake? Check for a casting date code on the block, right next to the oil filter adapter, should be early '69, a little before the build date, something like 9(year)B(month, February)14(day of the month)- 9B20 or similar for a build date in March '69
And if it does turn out to be a genuine CJ and isn't hacked up too bad, you could sell all the CJ stuff and finance a sweet new 445 stroker using one of Barry's kits and a 390 block, and have a very torquey engine, that is much better suited to pickup use than a 428CJ

 

Man guys, I have to say I am p*ssed. Tell me what this means, I found this under the driver's side head at the front of the engine
63
352


I am guessing year and what the block actually is. Tell me I'm wrong.

 

Ok, seems that that all have that code on them. Sheww.

 

What manufacture date is this?

 

Lots of 427's say "352" on the front, and some 360's and 390's say "66-427" on the back behind the flywheel- you're not the first to say WTF???

 

I think 375 to 400 hp is real generous. It takes big compression and a way bigger cam than the plain-jane performer to make that kind of power. I'd believe it with the Performer RPM cam and intake with a 750 cfm carb. If you want to be sure its got a 428 crank, pull a spark plug and check the stroke- 428s and 410s have nearly 4".