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Old 05-22-2010, 09:47 AM
Roadkill Roadkill is offline
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Join Date: May 2010
Posts: 278
Default 2.9 rebuild project.

Hi, I'm rebuilding a 1991 2.9 and I was wondering if anyone had some ideas for getting more power out of it. I'm thinking of haveing it bored .030 over and putting some headers on it. Would a bigger cam help? My brother has a chevy truck and was told that a bigger cam wouldn't do anything for it because it's fuel injected and the computer wouldn't give anymore gas, is ford the same way? thanks for any help.
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Old 05-24-2010, 07:09 AM
Psychopete Psychopete is offline
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Join Date: Jun 2009
Posts: 1,488
Default Re: 2.9 rebuild project.

The MAP/SD computer system can handle small cam changes. Anything too much and you'll have to switch over to a MAF computer to measure actual air flow as opposed to engine vacuum.

Boring is generally for restoring worn out cylinder walls as opposed to a performance upgrade on an engine with this little displacement. The money involved is not worth the return from a performance perspective.

Lots to a cam than just bigger, or higher lobes. Overlap, duration, etc all important factors on what cam will work best for how it needs to perform. Ask yourself what you want, then ask around some different cam manufacturers if they can grind it and work with them on a grind that will work best for your application.

If I had to do it all over again, I would start my build with having 2.8L flat top pistons installed (boring required and maybe some modifications). Mid/high RPM cam with matching valve springs, will have to figure out your new compression ratio. World heads ported with valve work and matched intakes. ARP rod bolts installed in the rods. Aluminum rocker arm spacers. Would try to find a way to do 1.5:1 or 1.6:1 rockers, but may not be feasible. Camcraft did make roller tip 1.55:1 roller rockers, but not sure if they still sell them ($500). Either way, you're looking at A LOT of money to get significant gains.

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