4.0 headers on a 2.9?

[richard booth]

I have headers for a 4.0 and I just finished my wife's 2.9 rebuild for her 88 B2 and the bolt pattern matches but are the tubes too big? Want to use them but not sure if it will be advantageous?

 

[88workcar]

Only one sure way to find out. In a normal world too large on exhaust will hurt bottom end power.

 

[Dirtman]

@PetroleumJunkie412 would know for sure...

 

[alwaysFlOoReD]

I believe they fit but the crossover doesnt work.

 

[PetroleumJunkie412]

@PetroleumJunkie412 would know for sure...

No clue. 4.0 is a source for stroker cranks for 2.9. And maybe edis. Early ones break heads as often as 2.9. Don't know much else.

 

[Dirtman]

No clue. 4.0 is a source for stroker cranks for 2.9. And maybe edis. Early ones break heads as often as 2.9. Don't know much else.

You're worthless...

 

[rusty ol ranger]

I have headers for a 4.0 and I just finished my wife's 2.9 rebuild for her 88 B2 and the bolt pattern matches but are the tubes too big? Want to use them but not sure if it will be advantageous?

If they bolt on i dont see why the tubes being larger would matter in a literal sense.

However unless youre planning on letting it scream all the time the bigger tubes will be worthless and will hurt your streetable torque.