Where to find head casting numbers - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 05-04-2011 Thread Starter
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Where to find head casting numbers

Just a quickie here, where can I find the casting number for my heads? I can't tell if it is PI or not, the more and more I push the car, the harder it is to believe it is NPI.


Black with saddle 1996 Mustang GT convertible. Manual. NPI, 2v 4.6L. Full bolt-ons.
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post #2 of 10 (permalink) Old 05-04-2011
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Post a close-up of the intake manifold, that'll tell me real quick if it's NPI or PI. And the casting numbers are on the side of the heads, which will be hard to see with the engine in the car.


2001 Dark Highland Green Bullitt
[email protected] naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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post #3 of 10 (permalink) Old 05-04-2011
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Nevermind, I looked at your pics and it's NPI.

2001 Dark Highland Green Bullitt
[email protected] naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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post #4 of 10 (permalink) Old 05-04-2011 Thread Starter
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Quote:
Originally Posted by Bullitt5339 View Post
Nevermind, I looked at your pics and it's NPI.
how can you tell??

Black with saddle 1996 Mustang GT convertible. Manual. NPI, 2v 4.6L. Full bolt-ons.
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post #5 of 10 (permalink) Old 05-04-2011
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Because it has 2 coolant temp sensors on a plastic coolant crossover.

Be happy, because if you think it's powerful now, with probably less than 200rwhp, wait until you do a PI swap and have 260rwhp..

2001 Dark Highland Green Bullitt
[email protected] naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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post #6 of 10 (permalink) Old 05-04-2011 Thread Starter
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Quote:
Originally Posted by Bullitt5339 View Post
Because it has 2 coolant temp sensors on a plastic coolant crossover.

Be happy, because if you think it's powerful now, with probably less than 200rwhp, wait until you do a PI swap and have 260rwhp..
I may be about to ask something stupid, but when doing a PI swap, do you absolutely have to swap the intake?

Black with saddle 1996 Mustang GT convertible. Manual. NPI, 2v 4.6L. Full bolt-ons.
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post #7 of 10 (permalink) Old 05-04-2011
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Pretty much, since the coolant ports are different, and anyone who would spend the time to swap the heads would know that just the PI intake is good for about 10-12rwhp gains over the NPI, so I doubt that they would swap the heads without the intake to match.

2001 Dark Highland Green Bullitt
[email protected] naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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post #8 of 10 (permalink) Old 05-04-2011 Thread Starter
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Quote:
Originally Posted by Bullitt5339 View Post
Pretty much, since the coolant ports are different, and anyone who would spend the time to swap the heads would know that just the PI intake is good for about 10-12rwhp gains over the NPI, so I doubt that they would swap the heads without the intake to match.
Makes sense to me! Thanks!

Black with saddle 1996 Mustang GT convertible. Manual. NPI, 2v 4.6L. Full bolt-ons.
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post #9 of 10 (permalink) Old 05-04-2011
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No problem, just remember, it gets better than what you're feeling now. And for the age, your engine is immaculately clean, I wish mine looked that good.

2001 Dark Highland Green Bullitt
[email protected] naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
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post #10 of 10 (permalink) Old 05-05-2011 Thread Starter
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Quote:
Originally Posted by Bullitt5339 View Post
just remember, it gets better than what you're feeling now.
To be honest I'm finding it hard to even imagine! I'm planning on doing the swap this summer, a little nervous because it's my first major mod. But thanks, that was the biggest factor when I bought it. I put in new springs this weekend and only came across one bolt that gave me any sort of trouble. Hell, even the isolators looked new!

Black with saddle 1996 Mustang GT convertible. Manual. NPI, 2v 4.6L. Full bolt-ons.
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