clutchdust
Millionaire Playboy
OK, last week I picked up a '93 1-ton with a 454 (7.4L) to replace my '99 1-ton that had the 6.5Lt. My problem is that this 454 is pretty much worn out. It has a significant blow by issue where it is pumping oil out of the valve covers around the PCV and filler cap. I got the truck for a smoking (no pun intended) deal so even if I have to overhaul the engine, I don't feel too bad.
Now here's the tricky part. As a '93, is this still a "Mark IV" block? I ran across a deal to pick up a complete but disassembled long block today. The block is supposed to be a late '60s/early 70's block and has the big oval port heads. What I'm thinking of doing is putting that short block together and just putting the '93 heads on it, then at a later point, building the '93 short block and putting the big port heads on it.
I just want to know if there are any significant architecture differences in big blocks from the early design to the '90s designs. I pulled a cover off this afternoon and peeked down a pushrod hole looking for "dogbones" but didn't see anything so I think this is a conventional flat tappet cam/lifter engine.
I'm fairly knowledgeable on the SBC but this is my first foray into big blocks.
Now here's the tricky part. As a '93, is this still a "Mark IV" block? I ran across a deal to pick up a complete but disassembled long block today. The block is supposed to be a late '60s/early 70's block and has the big oval port heads. What I'm thinking of doing is putting that short block together and just putting the '93 heads on it, then at a later point, building the '93 short block and putting the big port heads on it.
I just want to know if there are any significant architecture differences in big blocks from the early design to the '90s designs. I pulled a cover off this afternoon and peeked down a pushrod hole looking for "dogbones" but didn't see anything so I think this is a conventional flat tappet cam/lifter engine.
I'm fairly knowledgeable on the SBC but this is my first foray into big blocks.