What spark plugs to use?

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superbird6bbl

superbird6bbl

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Terre Haute, In.
I just installed a new set of RHS/Indy Cylinder Heads LA-X heads. I have a .484 Purple shaft,air gap intake, 750 Holley ,4200 stall, 904, 3.55 gears, and 9x28x15 Hoosier slicks . I run 1/8th miles Bracket racing. Thank you.
 
autolite 65 what I run strong and dependable, but I run a hot Factory X headed 345 never a problem .
 
K.O. SWINGER said:
autolite 65 what I run strong and dependable, but I run a hot Factory X headed 345 never a problem .
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Thanks K.O. I hand started the plugs but my regular spark plug socket wouldn't go into the hole to tighten them?? Do the RHS LA-X heads need plugs for Magnum heads? I had to buy Magnum head bolts since the LA bolts where too short, except for the longer one on each side.
 
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