sbc spark plug heat range

Discussion in 'PSI Superchargers Tech Questions' started by alkynova, Mar 31, 2009.

  1. alkynova

    alkynova New Member

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    I need some help on choosing the right heat range spark plugs for my sbc. 355 ci. 2.08 head. 10.5 scr 8 pounds of boost with injected alky. mallory 5 amp mag
     
    #1
    Last edited: Mar 31, 2009
    alkynova, Mar 31, 2009
  2. Mike Canter

    Mike Canter Top Dragster
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    You should use a -9 or a -10 plug. Probably the best would be a NGK R5671A-10. Remember alcohol does not foul a cold plug and you are not reading the fuel ring on the porcelein so you want a real cold plug to prevent detonation.

    If you are driving this on the street then it would be a little different.
     
    #2
    Mike Canter, Mar 31, 2009
  3. Blown Altered

    Blown Altered New Member

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    I have run the -9 (B9ES) plug for a long time on a small block with up to 23lbs of boost with no problems. The -10 plug is usually quite a bit more expensive than the -9 with no benefits in this type of combination. Good Luck
     
    #3
    Blown Altered, Mar 31, 2009
  4. GregM784

    GregM784 Member

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    I warm up on -8s and run on -9 5671 NGK's. I only blow about 17psi currently. 10.4:1, 372 Chevy
     
    #4
    GregM784, Apr 1, 2009
  5. crashly

    crashly Member

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    -9 plugs with 358sbc , 23 deg head
    20+ psi boost
     
    #5
    crashly, Apr 2, 2009

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