Need to know the diff/??
#2
Registered
I'll take a stab at this:
The 454 is a 4.25 bore, the 502 is a 4.5 bore
The tall deck blocks allow for more stroke, = more torque
The 525 is a 502 reg deck block
Someone else may be able to explain Gen 5 and 6?
The casting numbers and the block can be looked up on line for ID.
The 454 is a 4.25 bore, the 502 is a 4.5 bore
The tall deck blocks allow for more stroke, = more torque
The 525 is a 502 reg deck block
Someone else may be able to explain Gen 5 and 6?
The casting numbers and the block can be looked up on line for ID.
#4
Registered
Gen V blocks have a stamped steel timing chain cover with 10 bolts. From the factory have a flat tappet camshaft, peanut port heads. The mag engines have the rec port heads.
Gen VI blocks have a composit timing cover with 6 bolts. They have a roller cam, with vortec large oval heads on the 454. The Mag engines have the rec port heads.
All of the Merc engines are standard deck height.
Some of the old Merc Racing engines were tall decks. Like was said you can stroke it up to 4.375" with a tall deck. With a standard deck you can only go up to 4.25" stroke if you use offset pistons.
Gen VI blocks have a composit timing cover with 6 bolts. They have a roller cam, with vortec large oval heads on the 454. The Mag engines have the rec port heads.
All of the Merc engines are standard deck height.
Some of the old Merc Racing engines were tall decks. Like was said you can stroke it up to 4.375" with a tall deck. With a standard deck you can only go up to 4.25" stroke if you use offset pistons.
#7
Registered
Not to be picky, but a tall deck (10.2") can accept up to a 4.750" stroke. I don't like going over 4.5" stroke since you end up with a very short rod and steep rod angle.
The Gen VI 502 has a stock bore of 4.468"
Eddie
The Gen VI 502 has a stock bore of 4.468"
Eddie
#8
Registered
Eddie