Header Hitting Idler Arm
Thread Starter
Racer
Joined: Apr 2006
Posts: 450
Likes: 0
From: Alexandria Va
Header Hitting Idler Arm
Some of you know I just put a ZZ4 in my 74 Corvette. Tonight I put the passenger side header on and after bolting it tight, I see it's hitting the idler arm. These are Headman headers that came off my old 350 motor and they didn't hit before. The idler arm is new so maybe I got the wrong one. I don't have the old one so take a look at the picture and let me know your thoughts.
yeah I know the headers are rusted but I was going to buy some new ones soon. Maybe now is the time. Anyone install a ZZ4 and have the same problem? Did you replace the header? If so give me a part number and I'll order it tonight. Thanks for any feedback.
Last thing, there are no other holes in the idler arm or frame to be mistaken.
yeah I know the headers are rusted but I was going to buy some new ones soon. Maybe now is the time. Anyone install a ZZ4 and have the same problem? Did you replace the header? If so give me a part number and I'll order it tonight. Thanks for any feedback.
Last thing, there are no other holes in the idler arm or frame to be mistaken.
Racer
Joined: Apr 2005
Posts: 382
Likes: 23
From: Acworth, GA
Mine hit to, ever since I replaced the stock one with the heavy duty idler arm from VB&P. The heavy duty ones are a lot thicker....
Doesn't bother me that much so I just left it....Haven't had any trouble with it as of yet....Knock on wood....
Doesn't bother me that much so I just left it....Haven't had any trouble with it as of yet....Knock on wood....
Racer
Joined: Oct 2006
Posts: 293
Likes: 0
From: Colorado Springs Colorado
The3 -- I have a zz4 in my 73 vert and I have Jetthot headers. Header order # H2134. FYI -- it has been a year and a half since I ordered so the item number could be different. I am very happy with the headers.
No clearance issues with these headers.
Cheers,
Crunch
No clearance issues with these headers.
Cheers,
Crunch
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Burning Brakes
Joined: Jan 2004
Posts: 1,043
Likes: 4
From: Va
Thread Starter
Racer
Joined: Apr 2006
Posts: 450
Likes: 0
From: Alexandria Va
I dimpled the header and there is now about 1/4" separation. I am going to see if it hits when the engine is running (vibration). If it doesn't then they will come off and be sent for coating.
bobs77vette, good idea. I will try and move it tomorrow to get more clearance.
bobs77vette, good idea. I will try and move it tomorrow to get more clearance.
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I have a ZZ4 with Dynomax Ceramic covered headers and a heavy duty idler arm from NAPA. No clearance problems at all. Dynomax's are not very expensive and they were bent perfectly for the application. Only set of headers I've ever installed that fit right out of the box with absolutely modifications.
You can get them from Summit or Jegs.
Jason
You can get them from Summit or Jegs.
Jason
