Originally Posted by Bigred74
is it better to go for a 12v or 24v? what are the differences in them?
thanks for the input so far guys
Both are desirable for different reasons, although more people like the 12v trucks.
The 12v is all mechanical. No computers or emissions. The injection pump is legendary (P7100). These truck have static timing. There aren't really any flaws except the Killer Dowel Pin. There have been some late 12v trucks with the 53 block. It's rare though. These are stout engines.
Depending on the year and transmission, the 12v had 160, 180, or 215 HP injection pumps.
The 24v has electronic injection, a better flowing head (2 more valves per cylinder), and can be tuned electronically. Also has features like 6 cylinder and 3 cylinder high idle. The VP44 requires at least 10 psi fuel pressure from the lift pump to survive. Also the 53 block.
Here's some 53 block info:
There are 2 models of the VP44 injection pumps. Standard output and high output. SO are 235 HP 460 LB FT TQ. HO are 245 HP 505 LB FT TQ. HO pumps are only on 01-02 6 speed manual and fuel hard at low rpm's, but are only good up to about 550 HP. SO pumps are on automatic and 5 speeds and are good for 700+ HP. For max power, a lot of guys chose to swap a P-pump from a 12v.
That's a brief overview. Both engines have advantages and disadvantages. Here's some Killer Dowel Pin info: