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We gained an additional 5 hp by using a 1-inch tapered four-hole Super Sucker spacer from High Velocity Heads, netting us the final 583hp figure.
Chevy Small Block Dyno Tests - Old School Meets New

We gained an additional 5 hp by using a 1-inch tapered four-hole Super Sucker spacer from High Velocity Heads, netting us the final 583hp figure.  View Related Article