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I have a worked 350 in a 51 Ford coupe. Car sits on an 83 GMC chassis so I had to get headers to clear everything and they are tight to the block. Regular sized plugs would not even come close to fitting. These shorty plugs work great and just clear the headers enough to get boots on. I did add spark plug wire covers as well. Very pleased with how it has worked out for me
Verified purchase: Yes | Condition: New
Looking for plugs that will work on your headers? Look no further these fit my 79 GMC truck great. I highly recommend these plugs for your llSBC 350'sSBCSBSSBCSBS NlSBCSBSSBCSBSSBCSBS
Verified purchase: Yes | Condition: New
Spark plugs made big difference in engine performance.
Verified purchase: Yes | Condition: Pre-owned
It may not be a lot but the shorty plug allows the socket to fit against the header on my chevy
Verified purchase: Yes | Condition: New
great plugs
Verified purchase: Yes | Condition: New
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