Baldwin B34 vs Champ PH400: Oil Filter Compatibility
Compare Baldwin B34 and Champ PH400 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a 3/4-16 thread.
Quick verdict
Both use a 3/4-16 thread.
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
Baldwin B34 and Champ PH400 specifications
How matching is scored| Specification | Baldwin B34 | Champ PH400 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 71.4 mm | 70.1 mm |
| Gasket ID | 62.7 mm | 62.5 mm |
| Can OD | 93.7 mm | 93.73 mm |
| Height | 98.4 mm | 104.9 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 8 | 14 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 1.3 mm (Baldwin B34: 71.4 mm, Champ PH400: 70.1 mm).
Gasket ID differs by 0.2 mm (Baldwin B34: 62.7 mm, Champ PH400: 62.5 mm).
Champ PH400 is 6.5 mm taller (Baldwin B34: 98.4 mm, Champ PH400: 104.9 mm) -- check clearance before substituting.
Can OD is identical at 93.7 mm.
Both open their bypass valve in a comparable range: Baldwin B34 at 8-8 psi, Champ PH400 at 14-14 psi -- these ranges do not overlap.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.