Hey all! New user here and I have a couple questions for you guys. Im looking at a 1969 Mach 1 that was originally a Mach 1 390cid car but now has a 428CJ in it. The car is in great shape and would easily pass for a strong #3 car (not original and not frame off resto, just great shape). Its sitting in a storage building where its been for over 9 years. Guy wants $15K for it. What do you think?
The guy says that its a 428CJ in the car but Im not to familiar with #'s and things when it comes to Mustangs. Whats the visual differences between a 428CJ and a regular 428? Also, where are the engine block #'s on the engine and whats a good site to look them up? Thanks guys and please let me know ASAP!!
Casting numbers for the block are right there where the starter is.The cobra jet has 4 bolt mains different heads and intake.
From what I understand, 390's, 427's and 428CJ's have the same intake; or am I just compeletely wrong? I will be looking for those #'s near the starter tho, thanks!
I found this on the web, can anyone add to this????:::::
"A standard 428 will have a U1 crankshaft ballanced on the inside of the ballancer but weight added on crankshaft . This is an internally ballance assy . Most 428s in 7 liter [COLOR=#0000ff! important][COLOR=#0000ff! important]cars[/color][/color] will have heads with the smaller valves and a lesser highway friendly springs . Any 428 can be adinified by knocking out the second from back if I remember on drivers side bank freeze plug . Look inside with a flashlight . [COLOR=#0000ff! important][COLOR=#0000ff! important]Ford[/color][/color] stamped 428 inside the casting there . Most 428s have a weld A on the back of the block . They have the welbs as well on the inside of the block for cross bolts mains but not drilled yet . The [COLOR=#0000ff! important][COLOR=#0000ff! important]intake[/color][/color] most times have a stock intake .....Now a cj 428 is externally ballanced with a round weight behind the ballancer on the outside . That crank will have stamped on the crank UB . The heads on a cj will have bigger valves with double springs , bigger ports e smaller . Now the scj will to produce more rpms , better flow to produce more power . To addify a cj head between the middle [COLOR=#0000ff! important][COLOR=#0000ff! important]spark [COLOR=#0000ff! important]plugs[/color][/color][/color] you will find a date code like most heads such as 69ae which translated is a 1968 model . Beside that on other side of spark plug you will find 6090-N . If you ever see that 6090-N that will be cj heads , bet the farm . A cj intake will have a bigger vain like a big S for the water passage as soon as you walk up to one you can see it in front of the carb . A 390 vain will be close to the cj only alittle more hp this motor will produce and came in R code cars , however I think cjs did as well produced in r codes . The scj crankshaft will have UA1 stamped on it and will be externally ballanced as like the cj only a bigger throw weight behind the ballancer on the front of the crankshaft . You can idenify the scj motors by this weight . It looks like it is out of place on the fe motor , some call it a cookie cutter shape .Each starting with the first will have less hp than the others . Price for a good 428 is around 2 to 3000 bucks , a 428cj running good can be 4 to 5000 and a scj can be a great deal higher depending on the date code which on any fe motor is located on the side of the block . I know there is alot more but this can give you a start as well look each motor up on the web to see the differ."
From what I understand, 390's, 427's and 428CJ's have the same intake; or am I just compeletely wrong? I will be looking for those #'s near the starter tho, thanks!
My 428 CJ Mach I had a cast iron version of the PI intake which is aluminium. It was taller than a standard 390 intake.
What do you guys think about the $15K price tag on the car? Is it a good deal for the described condition (first post)? Or is that a little on the high side in CA?
There is a lot of dif in 390/428 ...390 has on intake a small vein where 428 has a large water vein for water passage , easy give away . 3 dif kinds of 428s . Internally ballanced with U1 on number 7 throw weight on crank . 428 cj will have Ub1 , a scj will have ua of a plain A .
428 visual from 390 , look behind crank ballancer . 428cj has a round weight for it is internally ballanced . scj will have a shape of cookie cutter or a hatchet shaped ballancer for it is extrenally ballanced .
390 heads will have 6090 h stamped between the spark plugs , a 428 will have 6090 -N between spark plugs showing it is a cj .
A 428 behind the block will have a welded A , a cj and scj will have a C shaped weld on back . The dif is for the assy line worker as block comes down assy line to adinify that block as to which rotating assy the block will get on dif fe motors .
The date code on a fe motor is below the oil filter base . Will put some sites up for you to study
Visual differances between 428CJ and regular 428? 
