Rocker arm differences & partial casting number
Thread Starter
|
Senior User
Joined: Nov 2003
Posts: 109
Likes: 0
From: Oxnard CA
Rocker arm differences & partial casting number
First, what is the difference between a "rail rocker arm" and a "sled rocker arm or sled fulcrum rocker arm? Can anyone give me a picture? I do much better with visuals. Trying to determine what I have on a possible 75-77 302.
Second, I've been through all the block and head casting number info here on his site and all over the Internert for my 74 -77 302. When I looked for the casting number on the right (driver side) head, all I could find is "302" at the back and "A3B" at the front. Although the truck is a 74 F100, I think the engine is a 75-77. I believe the heads are probably "D50E-A3B", but I cannot find the D05E on the head under the valve cover.
Second, I've been through all the block and head casting number info here on his site and all over the Internert for my 74 -77 302. When I looked for the casting number on the right (driver side) head, all I could find is "302" at the back and "A3B" at the front. Although the truck is a 74 F100, I think the engine is a 75-77. I believe the heads are probably "D50E-A3B", but I cannot find the D05E on the head under the valve cover.
Lead Driver
Joined: Sep 2003
Posts: 7,018
Likes: 210
From: SoCal
Sorry that I don't have pictures to post.
A rail rocker has tiny walls on the tip that surround the valve stem to keeps it aligned to the stem. Its fulcrum is a ball that fits into a mating socket in the arm, and the assembly is mounted on a stud. A sled rocker arm has a half-cylinder wedge with a pedestal for a fulcrum that fits into a mating cylindrical formation in the arm, which keeps the arm aligned. The cylinder is bolted by the pedestal to the head.
A rail rocker has tiny walls on the tip that surround the valve stem to keeps it aligned to the stem. Its fulcrum is a ball that fits into a mating socket in the arm, and the assembly is mounted on a stud. A sled rocker arm has a half-cylinder wedge with a pedestal for a fulcrum that fits into a mating cylindrical formation in the arm, which keeps the arm aligned. The cylinder is bolted by the pedestal to the head.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
First, what is the difference between a "rail rocker arm" and a "sled rocker arm or sled fulcrum rocker arm? Can anyone give me a picture? I do much better with visuals. Trying to determine what I have on a possible 75-77 302.
Second, I've been through all the block and head casting number info here on his site and all over the Internert for my 74 -77 302. When I looked for the casting number on the right (driver side) head, all I could find is "302" at the back and "A3B" at the front. Although the truck is a 74 F100, I think the engine is a 75-77. I believe the heads are probably "D50E-A3B", but I cannot find the D05E on the head under the valve cover.
Second, I've been through all the block and head casting number info here on his site and all over the Internert for my 74 -77 302. When I looked for the casting number on the right (driver side) head, all I could find is "302" at the back and "A3B" at the front. Although the truck is a 74 F100, I think the engine is a 75-77. I believe the heads are probably "D50E-A3B", but I cannot find the D05E on the head under the valve cover.
Thread Starter
|
Senior User
Joined: Nov 2003
Posts: 109
Likes: 0
From: Oxnard CA
Appreciate all the info. While researching engine information and casting numbers, I found a post that that said 75 was the first year for the smog heads with air injection tubes on the back end of the heads, which is what I have. I also noticed that the engine has a 2150 carb, which I think came out in 75. As I may have mentioned before, the enge has the A/C mount, but the truck did not come with A/C. I also think the 74 F100 long bed came with the C6 trans and the one in mine is a C4, which is shorter. I'm just going to assume that the engine I have is probably a 75-77.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The transmission could be anything back then, C-4, C-6 or an FMX I had a 69 E330 van that had a C-4 in it. Does the transmission dipstick go into the pan, or the case behind the bellhousing ? If it's a case fill, it's not a pickup C-4
Thread
Thread Starter
Forum
Replies
Last Post
raerjim
1948 - 1956 F1, F100 & Larger F-Series Trucks
3
Apr 25, 2010 05:06 PM
scottie2hottie
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
4
Aug 3, 2006 07:16 PM
