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what spark plug on alum scj

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gecsr
Lem Evans
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Post  johndickjr June 9th 2014, 9:35 pm

what is a good spark plug to run on a naturally aspirated 472 with 12-1 compression, using alum scj heads

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Post  rmcomprandy June 9th 2014, 10:08 pm

johndickjr wrote:what is a good spark plug to run on a naturally aspirated 472 with 12-1 compression, using alum scj heads

Does this have a domed piston or a flat-top...?

What brand would you like...?

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Post  johndickjr June 9th 2014, 10:31 pm

rmcomprandy wrote:
johndickjr wrote:what is a good spark plug to run on a naturally aspirated 472 with 12-1 compression, using alum scj heads

Does this have a domed piston or a flat-top...?f

What brand would you like...?
Flat tops .ive had good luck using autolite

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Post  rmcomprandy June 9th 2014, 11:34 pm

johndickjr wrote:
rmcomprandy wrote:
johndickjr wrote:what is a good spark plug to run on a naturally aspirated 472 with 12-1 compression, using alum scj heads

Does this have a domed piston or a flat-top...?f

What brand would you like...?
Flat tops .ive had good luck using autolite

Flat-top, 12/1, SCJ heads, NA ... I would use #3911 Autolites.

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Post  Lem Evans June 10th 2014, 10:26 am

R5671A-8 if you are a NGK guy.

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Post  gecsr June 11th 2014, 3:29 pm

So, would this 3911 hold true for the A-429 CJ head as well with the same conditions?
FT, ~12.0-1 CR, NA

Thanks,
Greg

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Post  quick 52 June 11th 2014, 4:36 pm

AR3934 there $4.00 or 3922, 3923 $2.00 .. myself I run the Ar3934 work with spray or n/a been in a couple years and still running fine

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Post  69F100 June 11th 2014, 11:39 pm

gecsr wrote:So, would this 3911 hold true for the A-429 CJ head as well with the same conditions?
FT, ~12.0-1 CR, NA

Thanks,
Greg

I am running the 3911 in my a 429 heads on my 552 with 14.7 c/r on alky and works good for me.
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Post  crittersf1 June 12th 2014, 7:19 am

I'm with Lem on this one. Partial to NGK's.
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Post  nuclearcobra June 14th 2014, 11:37 am

I have a 472 with scj's and diamond flat tops and use the ar3934's as Lem suggested , seem fine and last a while and worked good with a 125 shot so far.
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