The BTR intake manifold port O-ring services the cylinder-head-to-manifold-runner joint on square-port LS3/L99 Equalizer and Trinity intakes, and Ford Godzilla intakes. It does NOT service LS1 or LS7 applications — see BTR's #149 O-RING 70A for those. Molded from black rubber at a 70A durometer, 8 are required per intake, sold individually.
- Part Number: 146-70A
- Application: Square-port LS3/L99 Equalizer & Trinity intakes, Ford Godzilla intakes (NOT LS1 or LS7)
- Quantity Needed: 8 per intake
- Inside Diameter: 2.625 in
- Outside Diameter: 2.813 in
- Thickness: 0.094 in
- Material: Rubber, black, 70A durometer
FAQ
What engines is the BTR 146-70A intake manifold O-ring designed for?
It services square-port LS3/L99 Equalizer and Trinity intakes, plus Ford Godzilla intakes. It does not fit LS1 or LS7 applications — BTR's #149 O-RING 70A is the correct part for those.
How many O-rings are needed per intake?
8 are required per intake, sold individually.
What are the dimensions of the BTR 146 O-ring?
The O-ring measures 2.625 in inside diameter, 2.813 in outside diameter, and 0.094 in thick.
What material and durometer is the O-ring made from?
It's molded from black rubber at a 70A durometer.

