GT40 heads work with Standard Output 5.0 + stock cam? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 13 Old 04-03-2009, 08:10 PM Thread Starter
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GT40 heads work with Standard Output 5.0 + stock cam?

I bought a 88 T-bird with SO 302 and swapping over to some better parts. I'm going to add GT40 Heads + stock 5.0HO cam. Any reason to be concerned with interference?


87 Coupe work in progress.
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post #2 of 13 Old 04-03-2009, 08:43 PM
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Should be fine even with 1.7 rockers on the stock HO cam.

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post #3 of 13 Old 04-03-2009, 08:46 PM
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if the heads were milled you need to shim the rockers or run stud mounted rockers ( i'm sure you know that)
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post #4 of 13 Old 04-03-2009, 09:19 PM
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It'll be fine. The SO 302's came with the same pistons as the HO's.

'89 LX Coupe
GT40 306 with a few bolt ons and in the 12's
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post #5 of 13 Old 04-03-2009, 11:54 PM
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Originally Posted by Ehardy1971 View Post
It'll be fine. The SO 302's came with the same pistons as the HO's.
No they didn't. Its a cast dished piston. Should still be fine tho.

86 Lincoln Town Car
5.0 HO,FMS 1.72 roller rockers, BHPerformance ported E7 heads, Explorer intake, Hedman shorties, 2.5" dual exhaust with Impala tailpipes, traction lock with carbon-fiber clutches, 4 wheel disc brakes, ASP underdrive pulley

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post #6 of 13 Old 04-04-2009, 08:03 AM
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No they didn't. Its a cast dished piston. Should still be fine tho.
I have an '86 SO in my shop on an engine stand that says otherwise! It came out of a Cougar,and has forged slugs.

'89 LX Coupe
GT40 306 with a few bolt ons and in the 12's
'01 Lightning
#6257 of 6381 Bolt ons, pulleys, and tuned.
'06 TBSS
K&N drop in, and Borla dual exhaust, for now.
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post #7 of 13 Old 04-04-2009, 08:25 AM
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Either way with the pistons, you should be fine as long as the heads weren't milled extensively. You can always break out the clay and do a clearance test if you are concerned about P to V clearances.
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post #8 of 13 Old 04-04-2009, 11:36 AM
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Well as far as I know, SO 5.0 came with pistons that didn't have valve reliefs; mine didnt, and people I know with em had the same thing.

When swapping to the HO cam, you need to get a Mustang computer also (which is easy), and you'll need to change the firing order to that of the Mustang; they were different between the SO and HO. I also recommend that you grab a 60mm TB and HO upper intake, both of which can be had for dirt cheap.

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306ci, GT40 intake, 65mm TB, GT40Y heads, T5 swap, 8.8 disc rear w/3.55s, 11" front brakes, MM front & rear control arms, front coil overs, Koni yellows
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post #9 of 13 Old 04-04-2009, 01:09 PM
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The s/o engine uses the same E6 heads, upper intake, smaller tb and cast versions of the '86 HO's no valve relief pistons, along with a wimpy hr cam that uses the standard (non ho) firing order.

P to V MUST be checked... Most likely it will not NOT clear... If it does, you're one of the lucky few. You definitely won't be able to swap in a larger cam later on with out valve reliefs being cut.

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post #10 of 13 Old 04-04-2009, 03:13 PM
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Clearance with a stock HO cam should be fine....lots of us fox Tbird/Cougar owners run em with stock SO pistons and E7 heads.


1988 Thunderbird 5.0L | 240rwhp - 300rwtq
306ci, GT40 intake, 65mm TB, GT40Y heads, T5 swap, 8.8 disc rear w/3.55s, 11" front brakes, MM front & rear control arms, front coil overs, Koni yellows
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post #11 of 13 Old 04-04-2009, 09:50 PM
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Quote:
Originally Posted by Ehardy1971 View Post
I have an '86 SO in my shop on an engine stand that says otherwise! It came out of a Cougar,and has forged slugs.
I've had a lot of 86+ non-HO motors apart, never found one with forged pistons. All had those crappy cast dished jobbers like this:



Not saying you don't have forged pistons but they don't all have forged pistons. It would be interesting if maybe certain applications did come with forged slugs. All the ones I've played with were out of Vics and other full size cars.

86 Lincoln Town Car
5.0 HO,FMS 1.72 roller rockers, BHPerformance ported E7 heads, Explorer intake, Hedman shorties, 2.5" dual exhaust with Impala tailpipes, traction lock with carbon-fiber clutches, 4 wheel disc brakes, ASP underdrive pulley

91 Mark VII LSC SE - triple black, all stock
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post #12 of 13 Old 04-05-2009, 01:05 AM
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True,considering nothing seemed to be a set standard with a lot of Ford's stuff. "Hey,we're out of hyper pistons!" "F*** it!,we've still got some forged ones,right? Use them!"

'89 LX Coupe
GT40 306 with a few bolt ons and in the 12's
'01 Lightning
#6257 of 6381 Bolt ons, pulleys, and tuned.
'06 TBSS
K&N drop in, and Borla dual exhaust, for now.
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post #13 of 13 Old 04-05-2009, 07:13 AM
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LOL that sounds like Ford hahaha! I could see them doing that.

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