Intake Valves

Intake Valves: the part that decides how much air your head can breathe

The intake valves open on every intake stroke to let the air-fuel charge into the cylinder, then seal against the seat while the mixture burns. On a built or boosted engine that seal and that flow path matter: worn, cracked or bent valves cost you compression and cause hot spots, and a stock valve can be the choke point once you add cam, boost or oversized ports. People replace them during a head rebuild, a rebuild after a valve failure, or when they want a heavier-duty valve that survives higher rpm and heat than the factory piece. Oversized (+1mm) valves are used to gain a little more flow when the seats can be recut to suit.

What ThreePiece stocks

This category currently holds 116 intake valve products across five brands. By count the range leans on Supertech (50 items), followed by GSC Power Division (29), Brian Crower (18), Ferrea (17) and Manley Performance (2). Current in-stock pricing runs from $40 to $381 - that is the live range for what's on the shelf, not a fixed quote. Many listings are full valve sets (commonly sets of 12) rather than single pieces, so read each product's set count.

Concrete examples: the Brian Crower Nissan VQ35DE 37mm intake valves, the Supertech VQ37VHR +1mm oversize nitrided set, the Supertech RB25 24V +1mm oversize set, the GSC B58 / S58 30.1mm head set for Supra, Z4, M3 and M4, and two Ferrea VR38DETT options - the 37mm stock-size Competition Plus set and the 38mm +1mm Comp Plus set.

How to choose

Start with the size and stem your head needs - a valve only works if the head diameter, stem diameter and length match your application, which is why fitment matters more than brand loyalty. Choose stock-size valves when you're simply refreshing a tired head, and +1mm oversize when your machinist can recut seats to gain flow. Nitrided finishes (as on the Supertech sets above) are aimed at wear resistance under heat. Price tracks the application and set size: budget single-valve listings sit near the $40 floor, while full sets for engines like the VR38DETT reach the $381 top of the range.

What else you need with it

A valve job rarely stops at valves. Look at head gaskets and gasket kits for reassembly, pistons if you're building the bottom end at the same time, and bearings for the rebuild. Browse the full Engine Components section for the rest.

Fitment help and ordering

Fitment data is present on 18 of these products, covering sample vehicles such as the Subaru WRX and Impreza, Mitsubishi Lancer Evolution, Toyota Supra and GR Corolla, Acura Integra, BMW M3/M4 and Nissan 300ZX across a 1990-2024 year span. Confirm your exact head and engine code before ordering. Every order ships free, and Affirm and Katapult financing is available. Not sure a set fits your build? Call fitment help at 813-535-5801.

Intake Valves: the part that decides how much air your head can breathe

The intake valves open on every intake stroke to let the air-fuel charge into the cylinder, then seal against the seat while the mixture burns. On a built or boosted engine that seal and that flow path matter: worn, cracked or bent valves cost you compression and cause hot spots, and a stock valve can be the choke point once you add cam, boost or oversized ports. People replace them during a head rebuild, a rebuild after a valve failure, or when they want a heavier-duty valve that survives higher rpm and heat than the factory piece. Oversized (+1mm) valves are used to gain a little more flow when the seats can be recut to suit.

What ThreePiece stocks

This category currently holds 116 intake valve products across five brands. By count the range leans on Supertech (50 items), followed by GSC Power Division (29), Brian Crower (18), Ferrea (17) and Manley Performance (2). Current in-stock pricing runs from $40 to $381 - that is the live range for what's on the shelf, not a fixed quote. Many listings are full valve sets (commonly sets of 12) rather than single pieces, so read each product's set count.

Concrete examples: the Brian Crower Nissan VQ35DE 37mm intake valves, the Supertech VQ37VHR +1mm oversize nitrided set, the Supertech RB25 24V +1mm oversize set, the GSC B58 / S58 30.1mm head set for Supra, Z4, M3 and M4, and two Ferrea VR38DETT options - the 37mm stock-size Competition Plus set and the 38mm +1mm Comp Plus set.

How to choose

Start with the size and stem your head needs - a valve only works if the head diameter, stem diameter and length match your application, which is why fitment matters more than brand loyalty. Choose stock-size valves when you're simply refreshing a tired head, and +1mm oversize when your machinist can recut seats to gain flow. Nitrided finishes (as on the Supertech sets above) are aimed at wear resistance under heat. Price tracks the application and set size: budget single-valve listings sit near the $40 floor, while full sets for engines like the VR38DETT reach the $381 top of the range.

What else you need with it

A valve job rarely stops at valves. Look at head gaskets and gasket kits for reassembly, pistons if you're building the bottom end at the same time, and bearings for the rebuild. Browse the full Engine Components section for the rest.

Fitment help and ordering

Fitment data is present on 18 of these products, covering sample vehicles such as the Subaru WRX and Impreza, Mitsubishi Lancer Evolution, Toyota Supra and GR Corolla, Acura Integra, BMW M3/M4 and Nissan 300ZX across a 1990-2024 year span. Confirm your exact head and engine code before ordering. Every order ships free, and Affirm and Katapult financing is available. Not sure a set fits your build? Call fitment help at 813-535-5801.