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Old 09-03-2013, 12:37 PM   #1
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GT40 heads

Im new to the muscle scene. I bought my 5.0 about 2 months ago and learning pretty fast on keeping the car side ways. :] This is also my first rwd car. Anyways, I was wondering what I needed to install the GT40 heads? Is it straight bolt on or do I need some extra modding? My car's current mods are BBK headers, 650 DoublePumber carb, holley fuel pump, Edelbrock manifold, msd ignition and distributor, e303 cams, and 4.10 gears.. Im probably missing some more mods but nothing major... The guy I bought it from gave me the GT40 ported heads and a T5 transmission with the car cause the current transmission grinds 5th gear every now and then. I appreciate any help thanks
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Old 09-03-2013, 06:20 PM   #2
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Should bolt right on. Are they GTs or GTPs? Stock valve springs should be alright for the Ecam. If they're the Ps, you'll either need to fab up a tool to change the plugs or buy FRPP headers for clearance.
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Old 09-03-2013, 06:35 PM   #3
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They are the GTs.. I remember asking him if they bolt right on. And I think i recall him saying something about needing some hardened pushrods.
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Old 09-03-2013, 06:39 PM   #4
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If your using stock rockers, the pushrods should be the same length. Wouldn't hurt to get hardened pushrods for added insurance and they're cheap.
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Old 09-03-2013, 07:55 PM   #5
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Ill definitely look into that. I just want to be safe on the motor. Like I said, Im new to the muscle scene. So I still have a bit of research to do. Thanks for your help
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Old 09-03-2013, 08:21 PM   #6
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Just to make sure, look on the outside if the casting on the front or back.... If they have three vertical bars they are GT40's.

Sounds like you got hooked up with your purchase! That's great. And they'll bolt right up. As stated earlier, hardened push rods aren't necessary but good added insurance. Wouldn't be bad to swap in some high lift springs to go with them.
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Old 09-04-2013, 12:36 AM   #7
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Ive checked them before and yes it has the 3 vertical bars. And thanks!! People have told me that I got hooked up for the price. The car was apparently dynode at 300 to the wheel. They said I should get big improvements with the T5 and GT40s... Speaking of the springs tho, I think the guy put new high lift springs on the GT40s. He was fixing the car himself but had a family emergency. One of the reason why he sold it so cheap.
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Old 09-04-2013, 06:13 AM   #8
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Even though that's unfortunate, sounds like it was your gain.

If the work has already been done and the springs were upgraded, sounds like it's time for new gaskets and head swap time!
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Old 09-04-2013, 09:39 AM   #9
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Cool!. I just have to wait a couple of days for fedex. Lol. Im gunna break in some new tools :]
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Old 09-04-2013, 09:57 AM   #10
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Quote:
Originally Posted by Dion11197 View Post
Just to make sure, look on the outside if the casting on the front or back.... If they have three vertical bars they are GT40's.

Sounds like you got hooked up with your purchase! That's great. And they'll bolt right up. As stated earlier, hardened push rods aren't necessary but good added insurance. Wouldn't be bad to swap in some high lift springs to go with them.
+1 that.

---------- Post added at 08:57 AM ---------- Previous post was at 08:56 AM ----------

Have a look at your springs. Single? Or dual?
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Old 09-04-2013, 02:05 PM   #11
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How can I tell the difference?
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