VAC Motorsports Premium Stroker Kit, BMW S65, 4.4L/4.5L/4.6L/4.7L

VAC Motorsports has specialized in high performance engine builds for nearly 60 years, leading the industry for over two decades since we have started with BMW as a performance focus.

Our stroker kits provide the S65’s reputable natural aspiration with increased, low-rpm power and instant torque throughout its revolution range. We offer two variants: Both in 4.4-4.7L, one for the standard Alusil block so “no machining is needed,” and the other with iron sleeves that “require sleeving” for big boost, forced induction applications.

Option A: 

82.7mm Stroke 

- Bore size of:

-    92 mm gives a displacement of ~ 4400cc

-    93 mm gives a displacement of ~ 4500cc

-    94 mm gives a displacement of ~ 4600cc

Option B:

84mm Stroke  

- Bore size:

-    92 mm gives a displacement of ~ 4500cc

-    93 mm gives a displacement of ~ 4600cc

-    94 mm gives a displacement of ~ 4700cc