300I6 block length differences
Thread Starter
|
Posting Guru
Joined: Dec 2007
Posts: 2,324
Likes: 0
From: Revelstoke B.C.
300I6 block length differences
My '76 F250 4x4 daily driver has a 300 in it,the motor could use a rebuild,but runs really well.I decided to find another 300 and rebuild it and still be able to drive my truck.
I havn't tore down the replacement 300 yet because I have been noticing adds guy's have in the classified's sellig used 300's.most of the adds state that the 300 is a "short block" for early eighties truck's.
This has gotten me to wonder what I bought since it came out of a 1980
F150 4x4.
The 300 in my '76,I believe to be from the '70's.
Is there a difference?
I havn't tore down the replacement 300 yet because I have been noticing adds guy's have in the classified's sellig used 300's.most of the adds state that the 300 is a "short block" for early eighties truck's.
This has gotten me to wonder what I bought since it came out of a 1980
F150 4x4.
The 300 in my '76,I believe to be from the '70's.
Is there a difference?
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
All the 240/300 blocks are essentially the same until the EFI came along and then the difference is the fuel pump mount hole on the EFI is blocked.
Just found this on another site:
"Early '65 - '66 blocks used a smaller thrust bearing. If I were using a racing automatic transmission / high stall torque converter I would avoid these."
"Early blocks (pre mid 80s) also used front-loaded cam bearings; later ones used two front-loaded / two rear-loaded."
Just found this on another site:
"Early '65 - '66 blocks used a smaller thrust bearing. If I were using a racing automatic transmission / high stall torque converter I would avoid these."
"Early blocks (pre mid 80s) also used front-loaded cam bearings; later ones used two front-loaded / two rear-loaded."
Super Moderator
Joined: Apr 2004
Posts: 34,504
Likes: 2,822
Short Block: Block with all the rotating stuff, maybe the oilpan. No heads.
Long Block: Block as above, with heads, but probably no manifolds.
Manifolds don't need "rebuilding" as do blocks and heads, so it is assumed you are going to reuse your existing items. Ditto accessories.
300 blocks may have some differences as indicated above, but overall length and bell pattern are not among them.
Long Block: Block as above, with heads, but probably no manifolds.
Manifolds don't need "rebuilding" as do blocks and heads, so it is assumed you are going to reuse your existing items. Ditto accessories.
300 blocks may have some differences as indicated above, but overall length and bell pattern are not among them.
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Short block consists of
Block
Crank
Pistons
Rods
Main and rod bearings are installed as are cam bearings(usualy).
Long block
Add head(s)
Cam, Lifters, Pushrods, Rockers
Oil pump
and somtimes..........water pump and oil p/u
Block
Crank
Pistons
Rods
Main and rod bearings are installed as are cam bearings(usualy).
Long block
Add head(s)
Cam, Lifters, Pushrods, Rockers
Oil pump
and somtimes..........water pump and oil p/u
Thread
Thread Starter
Forum
Replies
Last Post
trozei
Ford Inline Six, 200, 250, 4.9L / 300
40
Sep 12, 2020 09:22 PM
AbusedAmericanRust
1973 - 1979 F-100 & Larger F-Series Trucks
7
Aug 16, 2015 03:08 PM
