High Horse Performance, Inc.Answer
Apr 22, 2026 - 01:53 PM
No, only the exhaust side of the 6.1L heads would need to be shimmed.
(8 shims come for 6.1s, to be installed over the valve seal on the intake side).
If you have further questions, or would like to place an order, please email sales@highhorseperformance.com back or call us at 888-894-1115 M-F 9am-6pm est
(8 shims come for 6.1s, to be installed over the valve seal on the intake side).
If you have further questions, or would like to place an order, please email sales@highhorseperformance.com back or call us at 888-894-1115 M-F 9am-6pm est
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