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Username Post: spark plug boot too tight        (Topic#364160)
Big T 
"15th Year" Silver Supporting Membe
Posts: 2751
Big T
Loc: Simi Valley CA
Reg: 04-14-06
01-29-21 03:08 PM - Post#2813220    

350 ho #6 cap "boot" is touching the fire wall. Motor is already moved 3/4 inches forward.


Is there a simple fix other than putting dent in the fire wall' ouch!!

can I shave any off the back top edge of the boot----maybe 1/16 "
tom

Tom

55 4 door BelAir


 


Rick_L 
Member #409
Posts: 27818
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-29-21 03:46 PM - Post#2813222    
    In response to Big T

I am assuming you have a big cap HEI.

If you trim the boot, the spark for that cylinder will short out to the firewall. HEI's are bad about that even with good boots and more clearance.



 
Big T 
"15th Year" Silver Supporting Membe
Posts: 2751
Big T
Loc: Simi Valley CA
Reg: 04-14-06
01-29-21 10:19 PM - Post#2813238    
    In response to Rick_L

thank you rick it is the large cap

Tom

55 4 door BelAir


 
56sedandelivery 
Gold Supporting Member
Posts: 5897
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
01-29-21 11:02 PM - Post#2813240    
    In response to Big T

Maybe a little WD-40 inside the boot before it goes on, just a touch however. You don't really want to use an oil based product on rubber parts at it does dissolve rubber. I am Butch/56sedandelivery.




 
wagonman100 
Site Ambassador
Posts: 15022

Loc: Baltimore, MD
Reg: 11-27-04
01-30-21 08:34 AM - Post#2813255    
    In response to Big T

You can get one of these caps. It arranges the wires to the side. All odd cylinders on the left side and even on the right.

https://performancedistri butors.com/product/dui-cr...

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Rick_L 
Member #409
Posts: 27818
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-30-21 08:39 AM - Post#2813257    
    In response to wagonman100

"Crossfire cap" is a good name for that. It will have the spark going to the wrong cylinders (crossfire) in no time. Far worse than a short to the firewall.



 
japete92 
"7th Year" Silver Supporting Member
Posts: 1592
japete92
Loc: No. Virginia
Reg: 01-18-13
01-30-21 09:48 AM - Post#2813262    
    In response to Big T

  • Big T Said:
thank you rick it is the large cap



There are 'small cap' distributors available. Simply add a separate coil (like GM did). I recommend an oil filled/cooled coil over and epoxy cooled type.

One of many:

https://www.summitracing.com/parts/msd-8560?seid=s ...

Pete



 
wagonman100 
Site Ambassador
Posts: 15022

Loc: Baltimore, MD
Reg: 11-27-04
01-30-21 04:20 PM - Post#2813285    
    In response to Rick_L

  • Rick_L Said:
"Crossfire cap" is a good name for that. It will have the spark going to the wrong cylinders (crossfire) in no time. Far worse than a short to the firewall.



No it won’t. It has the brass routed to go from where the rotor makes contact to the correct tower for the firing order encased in the plastic. We used one on my friend’s Nova that I converted to large cap HEI and had no room to route the wires around the cap as you normally would. Worked great. It neatens up the look of the wires as well.


Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Bad56Sedan 
"14th Year" Gold Supporting Member
Posts: 1335
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
01-31-21 09:44 AM - Post#2813335    
    In response to Big T

If you are that close already and you are apparently concerned,
possibly replace that HEI with the other GM HEI that is smaller in diameter?
Or replace with one of the smaller diameter after market distributors?
But to be 3/4" forward you would think it should fit so I wonder if you have other possible issues.
Possible motor/trans mount issues and the engine /trans has dropped a bit?






VC56S 2 door Sedan, 40 Years

[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image]


 


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