fuel pump push rod
Pro
Joined: Jun 2005
Posts: 725
Likes: 1
From: FL.
A different alloy is used for roller cams. Some need dist gears changed to be compatible. I've heard of fuel pump pushrods also having to be changed. I believe some have a roller tip, some have a different alloy at the tip. The thing is all about different hardness I believe. Most rollers cams now have the iron dist gear pressed on so its no longer an issue there but I don't know about the fuel pump lobe. My understanding is if this is not taken into consideration, the parts will begin to eat each other up. I have yet to use a roller cam. Sooo, I'm sure there are many here that can better confirm or deny what I've read and heard. I'll be going roller with my next build so I'll be researching all of that then.
All new Aftermarket Distributors Come with Gears that Can be used with New Hyd. Roller Street Cams. They are Melonized or similar metal treatment.
PS..If Im off with any of my info, Chime in, I know this subject is Frequently and sometimes Hotly debated.
Last edited by 69vettester; Jan 1, 2008 at 02:23 PM.
Drifting
Joined: May 2005
Posts: 1,629
Likes: 4
From: Somers CT
A different alloy is used for roller cams. Some need dist gears changed to be compatible. I've heard of fuel pump pushrods also having to be changed. I believe some have a roller tip, some have a different alloy at the tip. The thing is all about different hardness I believe. Most rollers cams now have the iron dist gear pressed on so its no longer an issue there but I don't know about the fuel pump lobe. My understanding is if this is not taken into consideration, the parts will begin to eat each other up. I have yet to use a roller cam. Sooo, I'm sure there are many here that can better confirm or deny what I've read and heard. I'll be going roller with my next build so I'll be researching all of that then.
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
GM Performance told me that's not true. I had the same concerns when switching from the L48 to the ZZ4 and called GM about what rod to use with this roller cam. They told me the original rod is exactly the same as a rod they would sell for that motor. I do see advertisements by Comp Cams for special rods, maybe it's a marketing ploy, I'm not sure.
It's one of those things that I don't like about roller cams, since it will mushroom the messing end, making it difficult to get it out once it needs changing.
I plan on using an electric fuel pump to bypass the problem.
For the rest I already have a Crane cam with a pressed on iron gear that is compatible with the iron gears of regular dizzy's.
Le Mans Master
Joined: Oct 2001
Posts: 5,943
Likes: 3
From: Wildwood IL
Crower tech said billet core cams need the bronze tip fuel push rod. Cast steel core cams can use any fuel push rod.Eddie
Drifting
Joined: May 2005
Posts: 1,629
Likes: 4
From: Somers CT
I bet that's top notch.
Racer
Joined: Mar 2006
Posts: 276
Likes: 1
From: Pistoia PT (ITALY)
Check the specs of your cam...... it must be evident if you have to utilize bronze distributor gear or/and bronze tipped pump pushrod.
There is cams (like the Crane I have) with iron gear planted in the steel core (a roller cam MUST be in steel due to the very high pressure contact with the roller tip of the lifter) still needing bronze tipo for the pushrod....
The cam manufacturer must give that kind of infos!
There is cams (like the Crane I have) with iron gear planted in the steel core (a roller cam MUST be in steel due to the very high pressure contact with the roller tip of the lifter) still needing bronze tipo for the pushrod....
The cam manufacturer must give that kind of infos!
