StockB2FromHell
New Member
- Joined
- May 6, 2004
- Messages
- 5
- Reaction score
- 0
- City, State
- Bremerton, WA
- Year, Model & Trim Level
- 87 Bronco II XLT
I understand that there are some BII/Ranger owners on this site, and so I thought I'd share this little-known bit of info...
The 2.9 will accept the roller cam and roller lifters from a 4.0 OHV engine. The lifter bore is identical, except for a retaining pin recess that must be machined in to keep the roller lifters properly aligned. The 4.0 roller cam will fit, but a bronze gear must be used on the 2.9 distributor shaft. The stock drive gear is chewed up quickly by the 4.0 cam.
Pushrod length? I haven't determined this yet. The 4.0 pushrods may work with the 2.9, since the rocker assembly is identical. The question is whether or not the 4.0's additional deck height will require custom pushrods for a 2.9.
Believe it or not, some of us would rather create an inbred 2.9 than swap in a 4.0
The 2.9 will accept the roller cam and roller lifters from a 4.0 OHV engine. The lifter bore is identical, except for a retaining pin recess that must be machined in to keep the roller lifters properly aligned. The 4.0 roller cam will fit, but a bronze gear must be used on the 2.9 distributor shaft. The stock drive gear is chewed up quickly by the 4.0 cam.
Pushrod length? I haven't determined this yet. The 4.0 pushrods may work with the 2.9, since the rocker assembly is identical. The question is whether or not the 4.0's additional deck height will require custom pushrods for a 2.9.
Believe it or not, some of us would rather create an inbred 2.9 than swap in a 4.0
