Header to spark plug boot clearance???

[taws697]

So, I threw the headers on my 327 to see how they fit. After threading in some spark plugs, I realized that they are tight to the primaries. In fact, the boot would touch. After doing some “clearancing” it got a little better. How close is too close? I plan to get the headers Jet Hot ceramic coated which should help with the heat as well. Here is how it looked at first:

And here is after I clearanced the primary:

This is just a random wire/ boot I had laying around. I’m just not sure what an acceptable distance would be to avoid toasting stuff. I think I’ve determined these headers must be designed for angle plug heads but I’d like to try and use them. Any input is appreciated! Thanks

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[boostedguy05]

Unsure how close is too close, you can get heat sleeves

https://www.summitracing.com/parts/the-14260?seid=srese1&gclid=Cj0KCQjw3s_4BRDPARIsAJsyoLMl9sqzDt1PFqUr0V1uHkKgAPI9rPc71SfIvKhJflzAGGoDccKa2J8aAvfzEALw_wcB

 

[daturbosix]

i assume you dont want to dimple the tubes?

you could always swap over to a shorty plug too... see if that helps.

 

[Bob Kazamakis]

The Fiberglass sleeves do wonders

 

[taws697]

Unsure how close is too close, you can get heat sleeves

https://www.summitracing.com/parts/the-14260?seid=srese1&gclid=Cj0KCQjw3s_4BRDPARIsAJsyoLMl9sqzDt1PFqUr0V1uHkKgAPI9rPc71SfIvKhJflzAGGoDccKa2J8aAvfzEALw_wcB

I might have to look into those. I was trying to avoid it because I’m going for a semi-factory look. (Whole engine painted orange, factory valve covers, cast iron gray headers, black wires, etc.) I may have no choice though.

i assume you dont want to dimple the tubes?

you could always swap over to a shorty plug too... see if that helps.

The last photo is where I started to dimple the primary. I guess I’m unsure of how far to go though. I guess I can keep banging these hookers. The shorty plugs are a good idea also....

 

[Ron Vogel]

If you Jet-hot them, what you did is enough. I’ve jet hot headers before on a SC motor, and even though they get hot, we’re talking maybe 500f tops. With an air gap it’s plenty

 

[Jon01]

Accel makes shorty plugs for many applications that will help with that problem.

 

[Ron Vogel]

Yeah, but I remember those accel plugs were the suck

 

[Bob Kazamakis]

I have sleeves on my plugs because they sit very close to my headers. This one actually lays against the primary.

 

[Bob Kazamakis]

Amazon.com: SHINEHOME Car 1200 Degree Spark Plug Wire Boots Heat Shield Protector Sleeve Cover Compatible with SBC BBC 350 454 8PCS : Automotive

Buy SHINEHOME Car 1200 Degree Spark Plug Wire Boots Heat Shield Protector Sleeve Cover Compatible with SBC BBC 350 454 8PCS: Coil On Plug Boots - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Those are the ones I have.

 

[Jon01]

Yeah, but I remember those accel plugs were the suck

I've never used them. Good to know their quality is on par with most accel products.