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Spark plugs with aluminum heads.

January 10 2018 at 5:06 PM
Jerry Mooney  (Login rcar5077)
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What plugs to run in a 428 race car with Edelbrock aluminum heads?

 
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paulie
(Login Paul_Lovett)
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Autolite 3924's......or

January 10 2018, 5:21 PM 

......or of you need a colder plug for a very high compression engine, try the Autolite 3923's or 3922's.

JMO,

paulie

 
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Brent Lykins
(Login blykins)
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What’s the compression ratio?

January 10 2018, 5:39 PM 

May be able to use an AR3924 for lower compression stuff all the way down to an AR3910 for higher compression.

 
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Jerry Mooney
(Login rcar5077)
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Compression ratio

January 10 2018, 8:48 PM 

Zero deck,.036 head gasket,69 cc heads 4.190 bore, 3.984 stroke.

 
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Brent Lykins
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What pistons and how far down are they? n/m

January 11 2018, 1:35 AM 


 
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Blair Patrick
(Login CaptCobrajet)
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NGK R-5671A-9........n/m.

January 11 2018, 4:59 AM 

Blair Patrick

 
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Joe-JDC
(Login Joe-JDC)
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Better check your piston to valve clearances, and your

January 11 2018, 6:34 PM 

actual clearance with a compressed head gasket. With a true zero deck and .036" compressed head gasket, you will most likely suffer a kiss from the pistons to the head. All FE's that I have experience with have the piston touch the heads with less than .038" clearance because of rod growth when hot. That is why most folks run the .041" gaskets to keep from this happening. Steel rods used to have a warning to make sure there is .050" combined clearance between pistons at TDC and the head when hot. Joe-JDC

 
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Barry_R
(Login Barry_R)
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Agreed

January 13 2018, 4:45 PM 

I had one very well developed engine with positive deck and .036 piston to head. With a 4.350 bore it would just barely show a witness in the carbon after a bunch of 6500 RPM dyno pulls. Thats as close as I would ever go. I think you can get a little closer with an aluminum block due to growth - but thats getting pretty brave.
Barry Rabotnick
Survivalmotorsports.com

 
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