chilsam
Well-Known Member
Will 4.0 heads work on 2.9? Have 4.0 intake & exhaust manifolds.Is there a diff in deck higth "ie distance between heads" THANX!!
-
Welcome Visitor! Please take a few seconds and Register
for our forum. Even if you don't want to post, you can still 'Like' and react to posts.
Head swap
- Thread starter chilsam
- Start date
- Joined
- Jun 1, 2001
- Messages
- 7,897
- Age
- 64
- Vehicle Year
- 1987... sorta
- Transmission
- Manual
Yes, the 4.0 is to a 2.9 as a 351windsor is to a 302.
The Deckheight is raised 20mm.
So, no the heads/manifolds won't work.
The Exhaust manifolds would bolt right up but then your Y-pipe would no longer fit.
The 4.0 with it's higher deck uses exhaust manifolds that "hug"
the block a little tighter so that BOTH the 2.9 and 4.0 bolt up
to the same Y-pipes...
I believe ford played the same trick on some F-series trucks with the 302 and 351
This information is "useful" because in something OTHER than an F-150
using 351 manifolds can make a 302 fit easier into a tight engine bay.
AD
The Deckheight is raised 20mm.
So, no the heads/manifolds won't work.
The Exhaust manifolds would bolt right up but then your Y-pipe would no longer fit.
The 4.0 with it's higher deck uses exhaust manifolds that "hug"
the block a little tighter so that BOTH the 2.9 and 4.0 bolt up
to the same Y-pipes...
I believe ford played the same trick on some F-series trucks with the 302 and 351
This information is "useful" because in something OTHER than an F-150
using 351 manifolds can make a 302 fit easier into a tight engine bay.
AD
chilsam
Well-Known Member
Thanx!!
What about just heads off 4.0 ,2.9 is an mfg/88 4.0 is 91. With 2.9 would coolent passages be on bottem or side of head? Sorry if I ask 2 many questions I believe knowledge is power Ive only worked with 300 & 460s in the process of putting the 91 sb ranger bod on 91 fs 300 e4od bronco chassis wheel base diff is only 1' + r - wish me luck! THANX 4 your time n knowledge!
What about just heads off 4.0 ,2.9 is an mfg/88 4.0 is 91. With 2.9 would coolent passages be on bottem or side of head? Sorry if I ask 2 many questions I believe knowledge is power Ive only worked with 300 & 460s in the process of putting the 91 sb ranger bod on 91 fs 300 e4od bronco chassis wheel base diff is only 1' + r - wish me luck! THANX 4 your time n knowledge!
- Joined
- Jun 1, 2001
- Messages
- 7,897
- Age
- 64
- Vehicle Year
- 1987... sorta
- Transmission
- Manual
No, the heads are similar, but not nearly similar enough to make them work.
AD
AD
Sponsored Ad
Sponsored Ad
TRS Events
Member & Vendor Upgrades
For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.
Recently Featured
Ranger Adventure Video
TRS Merchandise
Follow TRS On Instagram
