there is a specific rod for a roller cam if I remember correctly.
Hydraulic roller cam wiped out
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
Hydraulic roller cam wiped out
I finished tearing down my motor the other night and found a few interesting things...
I run a factory style mechanical fuel pump, and when I pulled the cam out, I noticed that the fuel pump lobe was completely wiped out. Im surprised the car didnt starve for fuel.
With a roller cam, should I still do a flat tappet style break-in if I use a mechanical fuel pump? The fuel pump pushrod looked fine, and the pump isnt any crazy high flow style either.
Should I get a different pushrod if I get a new cam?
It seems like it would be easier and only slightly more expensive to get a new cam instead of plumbing in a good external electric pump.
I run a factory style mechanical fuel pump, and when I pulled the cam out, I noticed that the fuel pump lobe was completely wiped out. Im surprised the car didnt starve for fuel.
With a roller cam, should I still do a flat tappet style break-in if I use a mechanical fuel pump? The fuel pump pushrod looked fine, and the pump isnt any crazy high flow style either.
Should I get a different pushrod if I get a new cam?
It seems like it would be easier and only slightly more expensive to get a new cam instead of plumbing in a good external electric pump.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Both types exist, and work.
When you buy a new cam, ask the manufacturer what they recommend.
Also, when you buy a new cam you might want to steer clear of buying another one of Comp's cast iron cores.
Billet rollers are much more durable.
When you buy a new cam, ask the manufacturer what they recommend.
Also, when you buy a new cam you might want to steer clear of buying another one of Comp's cast iron cores.
Billet rollers are much more durable.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Comp Crap cams require a bronze tip push rod or even a roller tip. Mine mushed the pump lobe and that is when they added it to the directions years ago
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Racer
Joined: Apr 2005
Posts: 259
Likes: 45
From: Columbus Mn
I'm running Comp Cams Solid Roller 12-704-8 and also ran the 4607 bronze tip fuel pump pushrod. During disassembly this fall I could barely get the fuel pump pushrod out of the motor. Fortunately the fuel pump cam lobe is fine, but the bronze tip sure is wearing fast. I'm wondering how many miles I would get out of the bronze tip, or if it was finally wore in/seated and I shouldn't be concerned.
Race Director
Joined: Jan 2000
Posts: 13,022
Likes: 2,264
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
The steel core cams need a bronze tip. The cheaper austempered cast ones will usually work with the stock pushrod. But one with a tip or roller will work on either. The tip one usually does very well on anything.
JIM
JIM
