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Old 06-12-2009, 01:17 PM   #1 (permalink)
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Default Best Heads for 302/5.0

Hi,

I have a 302/5.0 HO in my 64 1/2 Mustang that came out of a 93 stang with 37K miles. For the most part the engine is stock. I did put a E303 cam with Edelbrock RPM manifold with 4 barrel carburetor. I would like to change the heads and get the most bang (HP) for the bucks. The engine runs very strong, but I would like to have a few more horses under the hood. I really don't want to mess with the bottom end, but anything else goes. Thanks in advance for any ideas you might have.

Doug
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Old 06-12-2009, 01:44 PM   #2 (permalink)
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TFTW FTW!
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Old 06-12-2009, 02:51 PM   #3 (permalink)
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by far, the most popular for the 5.0 engines seem to be the afr 165/185 heads...
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Old 06-12-2009, 03:30 PM   #4 (permalink)
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I had essentially the same setup as you except for EFI... the engine made 231 rwhp.

Now it's been stroked to 331, AFR165s, 1.7 roller rockers, E303 cam and EFI. It does 107.5 MPH in the quarter mile. I don't have actual dyno numbers yet, but according to Virtual Engine 2000, it should be about 313 rwhp / 356 SAE hp.

AFR 165s are a bolt on, the 185s have 2.02" intake valves and may require notching your pistons... Both RHS and AFR suggest the 1.94 intake valve on a 302.
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Old 06-12-2009, 08:24 PM   #5 (permalink)
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I think the AFR 165's are the top seed for your application. 185's would be too big for the CID and cam.

Tim
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Old 06-12-2009, 11:36 PM   #6 (permalink)
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Thanks for all the input, seems like the ARF 165's are the best fit. I'll start rounding up the things I need to make the change.

Doug
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Old 06-13-2009, 12:49 AM   #7 (permalink)
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Best head I would say afr165. Best bang for the buck would be gt-40 or gt-40p, if they will work with your exhaust. Both of these are iron not aluminum like the afr. Me if I were spending the money on heads I would splurge for the afr's, unless I found a great deal on some used gt-40's
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Old 06-13-2009, 12:50 AM   #8 (permalink)
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Quote:
Originally Posted by Mustanggoins
Thanks for all the input, seems like the ARF 165's are the best fit. I'll start rounding up the things I need to make the change.

Doug
great choice. let us know how you like them.

Z.
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Old 06-13-2009, 12:57 AM   #9 (permalink)
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+1 on the 165's. That is what I am running and they work great. I put down over 400 at the wheels when I had my original tune. I only took it up to 5200 rpm and that was with a vacuum leak on the intake. I think I should be about 430 now that it runs good. I chose the 165's because I did not want to notch the stock pistons and I will not spin it to the rpm's that the 185's will give me a big benefit. I also have an E cam. Good choice on going with the 165's!
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Old 06-13-2009, 10:42 AM   #10 (permalink)
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Thanks to all.

Should I use 1.6 or 1.7 roller rockers?
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Old 06-13-2009, 01:49 PM   #11 (permalink)
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Can I use my stock push rods or do I have to purchase hardened ones and is so what length?
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Old 06-13-2009, 05:41 PM   #12 (permalink)
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Check this article out. Exactly what you are looking for.

http://www.carcraft.com/techarticles...dup/index.html

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Old 06-13-2009, 06:00 PM   #13 (permalink)
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I used 1.7 and was able to use the stock length push rods. I did get new pushrods though.
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Old 06-13-2009, 07:01 PM   #14 (permalink)
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ALWAYS check the pushrod length if your using a roller rocker. It's easy to do, and can save you some headache on wearing out your valvetrain in a hurry. The length checker tool is like $8.
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Old 06-13-2009, 10:19 PM   #15 (permalink)
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Default Best Heads for 302/5.0

Thanks you all for the information, it really helps. One final question, heads for Stud or Pedestal mount rockers?
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