As a general rule the four-hole spacer helps torque while the one-hole spacer helps top end. You may have to rejet the carburetor before any gain from the spacer is found, whether it is a one-hole or a four-hole.
Source: wiktionary
Rejet
Synonyms for "rejet"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.