Jetuplusllc AFM/DOD Oil Block Off Plugs for Gen IV & Gen V LS/LT Engines — Set of 8, Press-Fit with Removal Thread

Jetuplusllc AFM/DOD Oil Block Off Plugs are an eight-piece kit designed to seal AFM/DOD oil galleys on original Gen IV (2005–2018) and Gen V (2014–current) valley covers, enabling conversion from variable-displacement lifters to traditional lifters.

These precision-machined plugs fit the factory DOD/AFM valley cover oil passages and are intended for use when disabling displacement on demand systems or when converting to standard LS/LS7-style lifters. They press into the oil galley openings and sit flush with the plug lip; if removal is required later, the threaded top section accepts a small puller. Made specifically for original DOD/AFM valley covers, they will not fit non-DOD or aftermarket valley covers.

How do these plugs stop AFM/DOD oil flow?

The plugs physically block the oil passage under the valley cover so oil cannot reach the AFM/DOD lifter circuits. They are installed by gently tapping each plug into the oil galley hole until the plug lip is flush with the cover surface. The top also includes a tapped section to aid removal if needed.

• Blocks oil galley passages beneath the VLOM/valley cover
• Pressed-in installation — tap until flush with plug lip
• Top has 4mm x 0.7 tapped thread for removal tools
• Designed for factory DOD/AFM valley covers only

Will these fit my Chevy/GM/Olds/Cadillac LS/LT engine?

They are compatible with Gen IV engines from 2005–2018 and Gen V engines from 2014 onward when the original DOD/AFM valley cover is present. Confirm your engine uses the original DOD/AFM valley cover; aftermarket or non-DOD valley covers are not compatible with these plugs.

• Fits GM Gen IV (2005–2018) and Gen V (2014–current) with original DOD/AFM valley cover
• Not suitable for non-DOD or aftermarket valley covers
• Sold as an 8-piece kit to cover typical AFM/DOD galley locations

How are the plugs installed and removed?

Installation is straightforward: align the plug with the oil galley hole and gently tap it into place until the bottom lip is flush. For removal, the plug’s top has a tapped hole (4mm x 0.7) so a puller or threaded extractor can engage and back the plug out without damaging the valley cover.

• Install: slight tapping until flush with plug lip
• Removal: use the 4mm x 0.7 tapped top with an extractor
• No adhesives required; mechanical sealing via interference fit

Will using these plugs affect engine performance or maintenance?

These plugs only isolate the AFM/DOD oil passages and do not alter other oiling circuits. They are commonly used during conversion to conventional lifters; follow your conversion instructions and service manual to ensure correct lifter and oiling configuration. No lubricant or permanent modification is required for the plug installation itself.

• Isolates AFM/DOD lifter oil circuits only
• Common step during DOD/AFM lifter conversions to LS/LS7-style lifters
• Reversible removal possible via tapped top hole

Who is this for: Professional mechanics and experienced DIYers performing AFM/DOD disablement or lifter conversions on GM Gen IV and Gen V small-block engines. Choose these plugs if you have the original DOD/AFM valley cover and need a reliable, reversible way to block AFM oil galleys during a conversion or repair. Not for use with aftermarket valley covers or on engines that retain active AFM/DOD operation.