Headers spacers
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
Looks like the boot is just touching the primary. I'd be tempted to double up the manifold gaskets and relieve the primary a little to get maybe 1/4" of clearance. Might require a heat shield tube to keep from cooking the boot.
Like one of these.
http://www.summitracing.com/parts/tay-2570
http://www.summitracing.com/parts/the-14250
Like one of these.
http://www.summitracing.com/parts/tay-2570
http://www.summitracing.com/parts/the-14250
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
Looks like the boot is just touching the primary. I'd be tempted to double up the manifold gaskets and relieve the primary a little to get maybe 1/4" of clearance. Might require a heat shield tube to keep from cooking the boot.
Like one of these.
http://www.summitracing.com/parts/tay-2570
http://www.summitracing.com/parts/the-14250
Like one of these.
http://www.summitracing.com/parts/tay-2570
http://www.summitracing.com/parts/the-14250
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 64
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
I did cut the flanges as you can see in my pics, so that each connection is individual. I used a Fel Pro aluminum backed gasket set with individual pieces as patterns for the cuts on the flanges and for the spacers.
If i understand correctly, the original cast iron manifolds were bolted on without gaskets when new.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
http://www.sparkplugs.co.uk/graphics...ugs/RC12YC.jpg
Accel's don't seem me shorter but I don't know their lenght...
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
I started out with double gaskets. I had one blow out and did not have another set on hand, so I removed the gaskets and bolted it up tight and it has not leaked since.
I did cut the flanges as you can see in my pics, so that each connection is individual. I used a Fel Pro aluminum backed gasket set with individual pieces as patterns for the cuts on the flanges and for the spacers.
If i understand correctly, the original cast iron manifolds were bolted on without gaskets when new.
I did cut the flanges as you can see in my pics, so that each connection is individual. I used a Fel Pro aluminum backed gasket set with individual pieces as patterns for the cuts on the flanges and for the spacers.
If i understand correctly, the original cast iron manifolds were bolted on without gaskets when new.
You gave me an interesting point of view, thanks
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
The Accel shorty plugs are shorter, I just can't tell you how much exactly. They're about just long enough for the boot to fit on though. Here's a better picture that may help you see the difference.
http://www.summitracing.com/dom/part...make/chevrolet
Beyond that, making spacers is a good idea that will work to get your clearance.
http://www.summitracing.com/dom/part...make/chevrolet
Beyond that, making spacers is a good idea that will work to get your clearance.
Last edited by lionelhutz; Apr 22, 2014 at 12:12 AM.
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Melting Slicks
Joined: May 2006
Posts: 2,590
Likes: 403
From: Nashville TN
St. Jude Donor '09
I just installed the Accel 0414S on mine and they were something like 3/8"-1/2" shorter. The "S" in the part number indicates they are shorty header plugs. You can go online, post them questions with your engine specs and they will make a recommendation . . . they were very responsive (1-2 days) https://prestolite.zendesk.com/anonymous_requests/new
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,352
From: Santa Ana CA
Will it even be feasible to add the spacers?
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Will it even be feasible to add the spacers?
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Scott
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
I just installed the Accel 0414S on mine and they were something like 3/8"-1/2" shorter. The "S" in the part number indicates they are shorty header plugs. You can go online, post them questions with your engine specs and they will make a recommendation . . . they were very responsive (1-2 days) https://prestolite.zendesk.com/anonymous_requests/new
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
Will it even be feasible to add the spacers?
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Consider the curvature of the #1 and #2 downpipes and the fact that the bolt that you need to get into the hole is going to be over an 1" longer. Are you even going to be able to wrangle a long bolt up and though that hole in the header flange, even before putting the spacer behind it?
Some headers make this impossible.
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
I'm not able to found Accel's spark plug lenght...I've searched online but nothing. I only found detailed pics and I've tried to make a virtual misuration and seems that Accel's are the same ar a little longer than my Champion RC12YC which are 2.96" overall lenght. Could someone confirm it?
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
I know you live in Italy, and it's expensive to ship things there from the U.S., but I think the real solution here is to either get straight-plug heads that will work with your headers, or specialty headers that will work with your angle-plug heads.
Scott
Scott
Melting Slicks
Joined: May 2006
Posts: 2,590
Likes: 403
From: Nashville TN
St. Jude Donor '09
I'm not able to found Accel's spark plug lenght...I've searched online but nothing. I only found detailed pics and I've tried to make a virtual misuration and seems that Accel's are the same ar a little longer than my Champion RC12YC which are 2.96" overall lenght. Could someone confirm it?
Drifting
Joined: Jul 2011
Posts: 1,697
Likes: 139
From: Syracuse NY
So nobody wants to suggest this.....but you are going to need to beat the hell out of the tube and dent it for plug clearance. Ive got a set of beautiful Hedman ceramic coated headers on My BB and the same plug was ALWAYS burning out against the pipe. I had to beat mine up to get an extra 1/4 inch clearance.
Thread Starter
Racer
Joined: Apr 2007
Posts: 251
Likes: 0
From: Milan
So nobody wants to suggest this.....but you are going to need to beat the hell out of the tube and dent it for plug clearance. Ive got a set of beautiful Hedman ceramic coated headers on My BB and the same plug was ALWAYS burning out against the pipe. I had to beat mine up to get an extra 1/4 inch clearance.
Melting Slicks
Joined: May 2006
Posts: 2,590
Likes: 403
From: Nashville TN
St. Jude Donor '09
I measured both plugs, same way you had in your photo. Also, found out my old plugs are RN12YC, sorry for any confusion.
CHAMPION RN12YC - 8.0cm
ACCEL 0414S - 7.2cm
So looks like the Accels are .3cm shorter than the RC12YC (7.5cm) that you have.
CHAMPION RN12YC - 8.0cm
ACCEL 0414S - 7.2cm
So looks like the Accels are .3cm shorter than the RC12YC (7.5cm) that you have.