HELP! Installing GT40 Heads on a 289 engine. - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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Old 07-30-2011, 10:36 PM   #1 (permalink)
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HELP! Installing GT40 Heads on a 289 engine.

Here I am again needing help OK so here is my situation I recently picked up some freshly rebuilt GT40 (NOT GT40P) heads with a ARP head bolt kit and 2 new Fel Pro head gaskets for a cool 200$ I was hoping I can install them on my 289 engine. Here is my question.. or questions.

1. Can I use the rocker arms and pedestals from a 5.0 HO? or do they have to be from a car that came with GT40 Heads?

2. Since GT40 heads came on blocks with rollers will there be a problem with the 289 running on non roller hydraulic lifters?

3. Can the GT40 heads handle a cam with the following specs:


Hydraulic = 298 duration, .460 lift


As for push rod length I am going to try to measure it as soon as I get the heads bolted on. Unless anyone out there has done this conversion and knows the length.
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Old 07-31-2011, 03:37 PM   #2 (permalink)
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Re: HELP! Installing GT40 Heads on a 289 engine.

Just going by what I've read or been told;
stock pedestal rockers may hit the retainers so you'll have to check that.

The FRPP rockers for those heads require the taller 5.0 HO valve covers. They may have a clearance issue with regular height valve covers.

I think the GT40 valve springs are 120 pounds closed/240 open, 1.82 inch closed height, 1.4 open height. If that is in the range of your cam you should be good to go.

Considering all the things that can be involved you'll just have to check your pushrods. I think that is the only roller related issue.

The GT40 heads may have the intake ports lifted. I don't know if they all are that way or they redesigned the intakes at some point. If they are you will have an intake mis-match. You should have enough material in your intake to match that up. The GT40 heads require a specific intake gasket.

Good luck.
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Old 08-06-2011, 03:26 PM   #3 (permalink)
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Re: HELP! Installing GT40 Heads on a 289 engine.

The intake opening is the same as the old DOOE heads the runner is a bit different. The exhaust port is a bit larger. Think its about the same as some of the early 60s 289. Not shure but thinking there the same on the exhaust as the 289 HIPO heads runner a different though.
Most of the aftermarket gaskets will need the extra bolt hole at the front and rear water crossover trimmed out.
If your using the 289 stock pistons there will be a big compression loss. There was with the DOOE heads on a 289. The combustion chambers on the GT40s are a few more CCs than the old DOOE heads. You should do some caculations to find out just how much it goes down. I have specs on most 289 heads CCs if you need it.

+1 on checking push rod length.
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Old 08-06-2011, 03:36 PM   #4 (permalink)
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Re: HELP! Installing GT40 Heads on a 289 engine.

Quote:
Originally Posted by turbo2256b View Post
If your using the 289 stock pistons there will be a big compression loss. it.

+1 on checking push rod length.
I agree..Most 289 heads are in the 54cc range(advertised) vs about 60-64ccs for the newer E7 and GT 40 heads..That will drop you about one full point of compression..
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