85 C4 headers question
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
85 C4 headers question
I'm wondering about installing headers on my 85. I have AFR 190 heads (pn 1011) with a 7.5 qt. oil pan. Concerned about clearing the plugs and oil pan; noise; radiant heat into engine/passenger compartment; EASE of installation; significant power increase? All opinions welcome. TIA!!
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: 85 C4 headers question (GRX)
Do you have angle plug heads, cause you will need them!
If so, with the hookers 2151-1 you will clear fine but I have straight plugs & with the hookers an they are close on #3 & #4
If so, with the hookers 2151-1 you will clear fine but I have straight plugs & with the hookers an they are close on #3 & #4
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Re: 85 C4 headers question (GRX)
Then I would check into headers to clear the plugs better than mine, I can get by but I would do it different next time.
Maybe some others can tell about their setups.
Maybe some others can tell about their setups.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: 85 C4 headers question (GRX)
Hooker 2149, 2151, and 2151-1, all show to fit 1984 up L83s and L98s. I haven't installed any of these, but Hooker says they'll fit either stock head. They are specifically are listed to NOT fit angle plug heads, other than the "L98" angle, as mentioned above. good luck, and...
RACE ON!!!
PS. I believe Hooker specifically excludes the "AFR angle", angle plug heads. If your 190's are the "L98" angle, you should be OK.
[Modified by CFI-EFI, 6:44 PM 7/7/2003]
RACE ON!!!
PS. I believe Hooker specifically excludes the "AFR angle", angle plug heads. If your 190's are the "L98" angle, you should be OK.
[Modified by CFI-EFI, 6:44 PM 7/7/2003]
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: 85 C4 headers question (scorp508)
Careful! You need "L98 Angle" plugs, not "Angled" plugs.
Weird, so much variation on a simple motor! :lol:
[Modified by GRX, 6:08 PM 7/7/2003]
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Team Owner
Joined: Mar 2000
Posts: 83,383
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From: Boston, MA
Re: 85 C4 headers question (GRX)
AFR told me that 84 and 85 years had the "straight" plug (as I confirmed with my old iron heads). They also said that 86 thru later utilized the "L98 angle".
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: 85 C4 headers question (GRX)
AFR told me that 84 and 85 years had the "straight" plug (as I confirmed with my old iron heads). They also said that 86 thru later utilized the "L98 angle".
Weird, so much variation on a simple motor! :lol:
Weird, so much variation on a simple motor! :lol:
RACE ON!!!
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Re: 85 C4 headers question (scorp508)
AFR told me that 84 and 85 years had the "straight" plug (as I confirmed with my old iron heads). They also said that 86 thru later utilized the "L98 angle".
Yep, but the L98 headers require the L98 Angle plugs to clear. Or you'll be into mallet territory clearencing the things.
Yep, but the L98 headers require the L98 Angle plugs to clear. Or you'll be into mallet territory clearencing the things.
I have an '85 with stock heads and straight plugs, and the LPE longtubes fit and clear them no problem.. No modifications and still using normal Rapidfire plugs... :confused:
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: 85 C4 headers question (MrNuke)
I have an '85 with stock heads and straight plugs, and the LPE longtubes fit and clear them no problem.. No modifications and still using normal Rapidfire plugs... :confused:
Racer
Joined: Apr 2003
Posts: 337
Likes: 0
From: OLD DIRTY BASTARD LIVE AND UNCUT
Re: 85 C4 headers question (GRX)
with the 1985 L98 corvette, you need to use AFR L98 angle plug heads and a/c delco fr5ls or equilavent plugs. The length of the plug is critical so as to not hit the header on 3 of the cylinders.
No clearance problems at all with hooker 2149 or 2151 headers.
And move that f'n o2 sensor to the collector vs the #7 on the hookers.
No clearance problems at all with hooker 2149 or 2151 headers.
And move that f'n o2 sensor to the collector vs the #7 on the hookers.
