Mustang 1964-2020 Valve Stem Seals Positive Type, Guide Mounted Seal

Boost your engine's power seamlessly with our Valve Stem Seal Set of 16, crafted for GT-40 heads—no machining needed. Experience unmatched sealing and durability, fitting most standard guide diameters for superior engine performance.

PART NUMBER	TYPE	APPLICATION NOTES	PACKAGING
M-6571-A50**	Rubber ²	GT-40 cylinder heads. No machining required.	Pkg. of 8 intake and 8 exhaust seals.

NOTES: ¹ Guides must be machined to 0.530" diameter. See page 158 for details. ² Fits most production 0.550" - 0.570" diameter guides.