Headers and short plugs. - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C4 Tech/Performance
L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Headers and short plugs.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-24-2005, 11:19 AM   #1
Fozzy_Bear
Waka, Waka, Waka!
CI 4-6-8 & 10 Veteran
St. Jude Contributor
Support Corvetteforum!
Thread Starter
 
Fozzy_Bear's Avatar
 
Member Since: Jun 2002
Location: Hanover Maryland
Posts: 2,427
Thanks: 0
Thanked 0 Times in 0 Posts
Default Headers and short plugs.

Hi All.
I just installed TPIS long tube headers and plug number 7 is very close to the tube. I want to put a shorter spark plug in to give myself a little space (using Accell U groove plugs right now). I am sure I can spend 2 hours searching and find a list of plugs that would fit, but does anybody have any personal recommendations?
I am using stock heads (late '86 aluminium) now. And I will be swapping in a set of twisted wedge heads when I do a rebuild later this year.

thanks
Fozzy_Bear is offline   Reply With Quote
Old 03-24-2005, 12:37 PM   #2
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

Mr Gaskets website has Accels numbers, but I think they are the only short plug. Yo might want to also call Myron at TPIS and see what plug they use. I put a socket on one of my plugs, then tighten it, and the boot is real close to the header.
Accels tech line responded to me last night within a couple housr. But, they say they only make platinums for mine, 93 LT1.
steve40th is offline   Reply With Quote
Old 03-24-2005, 12:43 PM   #3
snoopdan
CF Senior Member
 
snoopdan's Avatar
 
Member Since: Sep 2004
Location: Fort Knox
Posts: 1,961
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Sounds like you have similar problems with your headers. My other thread about my headman woes might help ya. Us 86L owners have a few issues with headers, it appears.


snoopdan
snoopdan is offline   Reply With Quote
Old 03-24-2005, 12:44 PM   #4
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

That is strange, even with the shorter plugs? Does anyone else have shorter plugs. Dimpling the headers doesnt hurt, and I have heard of TPIS headers having to have this done.
steve40th is offline   Reply With Quote
Old 03-24-2005, 12:55 PM   #5
CTYANK2
CF Senior Member
Support Corvetteforum!
St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16
 
CTYANK2's Avatar
 
Member Since: Jan 2003
Location: SIMSBURY CT
Posts: 5,088

Thanked 23 Times in 22 Posts
Default

CTYANK2 is offline   Reply With Quote
Old 03-24-2005, 01:20 PM   #6
LD85
2005 Corvette
Support Corvetteforum!
 
LD85's Avatar
 
Member Since: Feb 1999
Location: Indianapolis IN
Posts: 12,716
Thanked 4 Times in 4 Posts
Default

header shorty plugs summit racing # acc-0414s and acc-0416s

Jegs # 111-0416s 14mm X .750 $2.99 each.

Summit has a ten day back order wait.
LD85 is offline   Reply With Quote
Old 03-24-2005, 01:23 PM   #7
Fozzy_Bear
Waka, Waka, Waka!
CI 4-6-8 & 10 Veteran
St. Jude Contributor
Support Corvetteforum!
Thread Starter
 
Fozzy_Bear's Avatar
 
Member Since: Jun 2002
Location: Hanover Maryland
Posts: 2,427
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by steve40th
That is strange, even with the shorter plugs? Does anyone else have shorter plugs. Dimpling the headers doesnt hurt, and I have heard of TPIS headers having to have this done.
They do have slight dimples for a few of the bolts, but nothing for the plug boots.

I _DO_ have thick boots (MSD) and there _IS_ some space (like .010") so I am not claiming that the headers are poorly designed (the Y pipe sucks, but that's a different thread). I just want a little more safety margin than that. I have ordered some heat insulating material from the forrum store; that will probably do the trick. I skimmed Snoop's thread and it was kind of the reason I was posting the question. a few people mentioned short plugs, so I thought I'd ask the question more specificly and see what people had to say.
Fozzy_Bear is offline   Reply With Quote
Old 03-24-2005, 01:26 PM   #8
Fozzy_Bear
Waka, Waka, Waka!
CI 4-6-8 & 10 Veteran
St. Jude Contributor
Support Corvetteforum!
Thread Starter
 
Fozzy_Bear's Avatar
 
Member Since: Jun 2002
Location: Hanover Maryland
Posts: 2,427
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by LD85
header shorty plugs summit racing # acc-0414s and acc-0416s

Jegs # 111-0416s 14mm X .750 $2.99 each.

Summit has a ten day back order wait.
Thanks,
But do you have any personal experience with those particular products? I was hoping to get some feedback from people who have actually used them.
Fozzy_Bear is offline   Reply With Quote
Old 03-24-2005, 01:54 PM   #9
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

They are the U Groove, which is very similiar to the V Groove in NGK. I cant see really how plugs are made any different. There is probably a company thaqt is contracted to do the plugs for Accell.
steve40th is offline   Reply With Quote
Old 03-24-2005, 02:06 PM   #10
JAKE
CF Senior Member
 
JAKE's Avatar
 
Member Since: Feb 2000
Location: Kempner Texas
Posts: 9,715
Thanks: 0
Thanked 5 Times in 5 Posts
Default

Champion makes a RC series plug that is almost 1/4" shorter than regular plugs. Edelbrock recommends using that series for more clearance.

Something like RC12YC.

Jake
JAKE is offline   Reply With Quote
Old 03-24-2005, 02:09 PM   #11
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

Jake, I have an LT1, do you know if that is the same plug by chance, or do I need to just go down and find some Champion plugs?
steve40th is offline   Reply With Quote
Old 03-24-2005, 02:20 PM   #12
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

Hey I just went to the Jegs website and they have 2 plugs there, a RC12YC that is a .750" reach, and a RV12YC that is a .460" reach. I checked Accels and they say LT1 have a .460" reach for the recommended plugs needed. SO is the LT1 that different to the L-98 motors?
The reason I say this is Edlebrock does recommend the RC12YC, but Accell recommends the .460" reach, and I believe the reach part is how m\far the plug goes into the head?
steve40th is offline   Reply With Quote
Old 03-24-2005, 02:29 PM   #13
JAKE
CF Senior Member
 
JAKE's Avatar
 
Member Since: Feb 2000
Location: Kempner Texas
Posts: 9,715
Thanks: 0
Thanked 5 Times in 5 Posts
Default

Quote:
Originally Posted by steve40th
Hey I just went to the Jegs website and they have 2 plugs there, a RC12YC that is a .750" reach, and a RV12YC that is a .460" reach. I checked Accels and they say LT1 have a .460" reach for the recommended plugs needed. SO is the LT1 that different to the L-98 motors?
The reason I say this is Edlebrock does recommend the RC12YC, but Accell recommends the .460" reach, and I believe the reach part is how m\far the plug goes into the head?
Steve, I've got an Excel file with TONS of plugs in a cross reference format. If you'd like it, let me know and I'll send it.

Might help you out.

Jake
JAKE is offline   Reply With Quote
Old 03-24-2005, 02:41 PM   #14
vettefast
CF Senior Member
 
vettefast's Avatar
 
Member Since: Sep 2003
Location: 1990 383 Stroker Baltimore Maryland
Posts: 1,652
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by LD85
header shorty plugs summit racing # acc-0414s and acc-0416s

Jegs # 111-0416s 14mm X .750 $2.99 each.

Summit has a ten day back order wait.
These are the plugs I had to change to after I had my 383 built with Hooker long tube headers. To date they work great and hasn't missed a beat. Also I have not had a burnt boot yet! I got them through Summit.
vettefast is offline   Reply With Quote
Old 03-24-2005, 02:44 PM   #15
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

Jake, please email it to me. corvettesrule@hawaii.rr.com
This is confusing, about the reach, as 2 companies recommended diferent reaches.
Just went to Chamions website and they recommend a RS14Yc6 which has a .708" reach. Now I begin to wonder. I am going to go to the store, and buy one of each with the different reaches and put them in my heads. I have the heads off and will get photos.

Last edited by steve40th; 03-24-2005 at 02:48 PM.
steve40th is offline   Reply With Quote
Old 03-24-2005, 02:49 PM   #16
DINO
CF Senior Member
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
I went to Cruise-In V with Vetteweiser
 
DINO's Avatar
 
Member Since: Feb 2000
Location: Howell N.J. Home of Redgar
Posts: 3,529
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I had a similar problem with #8 , we put a shield that the F-bodies have on there plugs and wah la no problems .
DINO is offline   Reply With Quote
Old 03-24-2005, 03:08 PM   #17
JAKE
CF Senior Member
 
JAKE's Avatar
 
Member Since: Feb 2000
Location: Kempner Texas
Posts: 9,715
Thanks: 0
Thanked 5 Times in 5 Posts
Default

Quote:
Originally Posted by steve40th
Jake, please email it to me. corvettesrule@hawaii.rr.com
This is confusing, about the reach, as 2 companies recommended diferent reaches.
Just went to Chamions website and they recommend a RS14Yc6 which has a .708" reach. Now I begin to wonder. I am going to go to the store, and buy one of each with the different reaches and put them in my heads. I have the heads off and will get photos.
Already sent to you and you've already received it. Fast "ain't" I?

You probably already know this, but you've got to choose plugs with the correct reach, thread, hex and heat range, seat type and over-all length.

I've seen heads with .460 reach plugs installed when they should have been .750 and several threads in the heads were exposed to the combustion process.

I've also seen plugs meant for aluminum heads screwed into cast iron jobs. My conclusion: Don't depend on the parts counter guy to give you the correct plugs. Know what you need before you walk in the door.

Just my thoughts.

Jake

Jake
JAKE is offline   Reply With Quote
Old 03-24-2005, 03:40 PM   #18
tpi1986
CF Senior Member
 
tpi1986's Avatar
 
Member Since: May 2004
Location: Martell NE
Posts: 227
Thanked 3 Times in 2 Posts
Default

problem is they told me that was with a tappered seat, which the factory alm head is not. Freaking driving me nuts
tpi1986 is offline   Reply With Quote
Old 03-24-2005, 03:50 PM   #19
steve40th
CF Senior Member
St. Jude Donor '03 & '05
 
Member Since: Feb 1999
Posts: 8,522
Thanks: 0
Thanked 1 Time in 1 Post
Default

TPI86, Didnt GM have a aluminum head on the Vette and a cast iron head on the Camaro L-98 motors? Maybe they are confused.
steve40th is offline   Reply With Quote
Old 03-24-2005, 04:05 PM   #20
tpi1986
CF Senior Member
 
tpi1986's Avatar
 
Member Since: May 2004
Location: Martell NE
Posts: 227
Thanked 3 Times in 2 Posts
Default

Quote:
Originally Posted by steve40th
TPI86, Didnt GM have a aluminum head on the Vette and a cast iron head on the Camaro L-98 motors? Maybe they are confused.
Yes that is true alm on the vette from feb 86 on and Iron always on the camaros, but the problem is that the alm head has a 3/4 reach with a non tappered seat. The seat seems to be the big problem. I have found plugs that are short, with the right reach but have a tappered seat.

Believe me, if someone finds one I will be their biggest fan. This entire search has about made me nutz
tpi1986 is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Headers and short plugs.
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Headers and angle plugs croaker C3 General 12 05-18-2016 08:10 AM
    Colder plugs after header install? Bone Daddy C6 Tech/Performance 6 02-03-2007 05:08 PM
    stupid angle plug head question bumpnzx3 C4 Tech/Performance 9 02-18-2006 04:50 PM
    Short Spark Plugs for Angle Plug Heads Ed Blue 03 C3 Tech/Performance 24 02-13-2006 08:39 AM
    AFR and Hooker plug clearance LD85 C4 Tech/Performance 4 09-23-2004 05:24 PM


    Tags
    0414ss, 383, c4, headers, plugs, short, shorter, stroker, vehicles

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 02:38 AM.