Wanting to replace original 2.8l heads with 2.9l heads

Tiny
DARRIN URBAN
  • MEMBER
  • 1985 FORD
  • 2.8L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
I have a Ford 2.8l and I would like to put ford 2.9l heads on. I know there are some machine work needed, but not sure what this entails, what parts to use, head bolts, gaskets, push rods, etc. Do you have any answers, or suggestions?
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Thursday, September 15th, 2016 AT 4:21 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
What are you trying to accomplish? What model do you have and where did you find a 2.9L?
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Friday, September 16th, 2016 AT 1:14 PM
Tiny
DARRIN URBAN
  • MEMBER
I'm not really sure what I'm trying to accomplish, just heard it was possible and am wondering what machine work is necessary.
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Friday, September 16th, 2016 AT 3:51 PM
Tiny
CARADIODOC
  • EXPERT
With no other details, it sounds like you're trying to do an impossible job for no reason. A larger head usually has a larger "chamber" where the fuel and air gets squeezed into. That means with more area, less compression will result. Lower compression means lower horsepower. That is the goal only when adding a turbocharger. Turbocharging an engine with a normal compression ratio leads to all kinds of problems that almost always result in a destroyed engine.

I can't find a Ford model that even uses a 2.9L engine in the year you listed. If the head is from a different model, different year, or different engine size, it is very likely the intake manifold won't bolt up to it and the runners won't match up. Same goes for the exhaust manifold. I suggest you sell this car and buy what you want. Projects like this almost always end up in the front yard with a "For Sale As Is" sign in the window, and a box of parts in the trunk.
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Friday, September 16th, 2016 AT 10:00 PM
Tiny
DARRIN URBAN
  • MEMBER
There's really no reason to sell the car, as I was JUST curious in the first place. I was told it was possible. And as I previously stated, I was curious thank you for your response.
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Saturday, September 17th, 2016 AT 8:07 PM
Tiny
CARADIODOC
  • EXPERT
Yup. Come back and see me when you have something I can really help with.
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Sunday, September 18th, 2016 AT 7:52 PM

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