drivelineman
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Any idea's if a 1996 big block mark 5 motor is worth much? Its my back up motor for my truck- I don't know much about the later modle ones- Jess
CK5
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mark 5 big block?
- Thread starter drivelineman
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If it's a 1996 it should be a Gen VI motor. If it is then it's probably worth looking at. The Gen VI motors all (except real early and some heavy duty) came with vortec heads 9:1 compression, roller cams etc. Like the Gen V motors they were 4 bolt main , non-adjustable valve train and won't readily accept earlier Mark IV heads.
drivelineman
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It clearly say's mark5 on the valve train -I assume its that- The cam is junk and will get replaced stock crap - Jess
Does it have an aluminum timing cover with 6 bolts? If it does then it is Gen VI, if not then it's a Gen V.
If the cam is flat then it's probably a Gen V. Why did it go flat? Did it wipe out the bearings? Make sure to find out before you put any money into it.
It's a good idea just to skip on the flat tappet cams because of the problems with current oil and flat cams. If you do run a flat tappet cam make sure you always run a good additive.
As far as my experience has been Gen 5 and 6 heads will go on Mark 4 blocks but not vice versa. Although I have heard of guys using mark 4 heads with a certain head gasket on gen 5 and 6 blocks. But it is hit or miss if the cooling passages line up good enough to seal.
If the cam is flat then it's probably a Gen V. Why did it go flat? Did it wipe out the bearings? Make sure to find out before you put any money into it.
It's a good idea just to skip on the flat tappet cams because of the problems with current oil and flat cams. If you do run a flat tappet cam make sure you always run a good additive.
As far as my experience has been Gen 5 and 6 heads will go on Mark 4 blocks but not vice versa. Although I have heard of guys using mark 4 heads with a certain head gasket on gen 5 and 6 blocks. But it is hit or miss if the cooling passages line up good enough to seal.
Does it have an aluminum timing cover with 6 bolts? If it does then it is Gen VI, if not then it's a Gen V.
If the cam is flat then it's probably a Gen V. Why did it go flat? Did it wipe out the bearings? Make sure to find out before you put any money into it.
It's a good idea just to skip on the flat tappet cams because of the problems with current oil and flat cams. If you do run a flat tappet cam make sure you always run a good additive.
As far as my experience has been Gen 5 and 6 heads will go on Mark 4 blocks but not vice versa. Although I have heard of guys using mark 4 heads with a certain head gasket on gen 5 and 6 blocks. But it is hit or miss if the cooling passages line up good enough to seal.
Gm has some hard faced lifters that are a ton better. Still will be going roller on the rebuild but these should out last the rest of the engine.
drivelineman
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the cam is actually fine -But its not enough cam for me -so it will get tossed- Jess
Does it have an aluminum timing cover with 6 bolts? If it does then it is Gen VI, if not then it's a Gen V.
As far as my experience has been Gen 5 and 6 heads will go on Mark 4 blocks but not vice versa. Although I have heard of guys using mark 4 heads with a certain head gasket on gen 5 and 6 blocks. But it is hit or miss if the cooling passages line up good enough to seal.
Ok, i just verfied in the GM Performance parts book that ALL 1996-newer Gen V and Gen VI use the aluminum timing cover with 6 bolts.
Also verified that the Gen V and Gen VI heads CANNOT be used on a Mark IV engine (at least without some work).
Can you change the cam between the Gen IV and Gen V?
My nephew has a 95 motor in his blazer and I have a new never used hydraulic roller (for a gen IV) we want to use for it.
Can we also use retrofit hydraulic rollor lifters for a Gen IV in a Gen V?
Lets keep this correct, the first series of BBC was a Mark IV, then came the Gen V and later the Gen VI.
The hydraulic roller cam you have is for what series of engine? I'm not sure since you seem to be getting the series mixed up.
The cam and lifters is for the early BBC "Mark IV".
