302 build - Vintage Mustang Forums

 
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post #1 of 12 (permalink) Old 02-16-2017, 10:19 PM Thread Starter
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302 build

I know there are many variables but wanted to get some input on a 302 I want to freshen up. This summer I purchased a 91 302 (code F1SE). The guy had AFR 185 heads(72cc); Airgap intake; 670 avenger carb, Comp Magnum 1.6 rockers. He says the bottom end is stock. Also, says it has 91,000 miles on it. Had BBK headers but sold those because wouldn't fit in my 66'. The engine was in the car running when I looked at it and is now on a stand in my garage.

I would like to put a cam in it to take advantage of the heads. From what I've read 165's would be better but this is what I have so would like to make them work. My first concern is the valve-piston clearance. Are there any other ways I need to approach this. Planning on running a AOD behind this (haven't bought yet) and keeping my 8 in with 3:55 gears. This car will be driven on weekend trips and maybe(?) a trip to the strip from time to time. I want good sound, plenty of getup, and reliable. And plenty of get up (just scary enough so my wife won't ask to drive it!).
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post #2 of 12 (permalink) Old 02-17-2017, 12:09 PM
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Those are very nice heads I just think a little big for a 302, but my main concern with them is the 72cc combustion chambers. ON a stock 90s 5.0 compression ration was 9:1 with the 60-63cc stock heads. You just dropped that compression into the 8 to something range with these heads slowing velocity down. Ill let other more knowledgeable folks input on the cam but I would think you would have wanted the 58cc AFR 185 heads or mills yours down to that.
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post #3 of 12 (permalink) Old 02-17-2017, 12:17 PM
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To really take advantage of those heads one should build an engine capable of 7000 to 8000 RPM PEAK POWER.
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post #4 of 12 (permalink) Old 02-17-2017, 03:09 PM Thread Starter
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I'm not an engine guy but that was one of my concern's with the 72cc heads. The engine was in a 91' foxbody set up for the strip. My question is what advantage would this setup have on the strip?
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post #5 of 12 (permalink) Old 02-17-2017, 03:23 PM
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Sounds like perfect heads and compression for a supercharger
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post #6 of 12 (permalink) Old 02-17-2017, 06:39 PM
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Originally Posted by Il66 View Post
I'm not an engine guy but that was one of my concern's with the 72cc heads. The engine was in a 91' foxbody set up for the strip. My question is what advantage would this setup have on the strip?
Are you sure they are 72cc heads?
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post #7 of 12 (permalink) Old 02-18-2017, 01:41 AM
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Any part numbers on the heads? That will tell you the combustion chamber size.
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post #8 of 12 (permalink) Old 02-18-2017, 10:26 AM
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Sounds like perfect heads and compression for a supercharger
Ding,ding,ding! Winner chicken dinner! Put some forced induction to it and have a ball!

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post #9 of 12 (permalink) Old 02-18-2017, 02:45 PM Thread Starter
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The # on the heads is:1387.
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post #10 of 12 (permalink) Old 02-18-2017, 03:22 PM
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Those heads are NOT too big for a 302. It's a complete myth that is constantly being perpetuated across the forum. The secret to making more power is lots of air in and lots out. You've got a great starting point with the AFR 185's, now pick a cam to make the most of them!

Call Lunati or Comp and tell them what you want out of the car. You're going to need to pull those heads to find out what pistons you have and measure for piston to valve clearance.

As mentioned before, double check that those are 72 CC chambers as that is HUGE. If that's really the case, consider having them milled a bit to bump up compression.

As is, it's probably a great candidate for forced induction

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post #11 of 12 (permalink) Old 02-19-2017, 01:50 AM
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The # on the heads is:1387.
That is the 72cc combustion chamber head. If it hasn't been milled yet you may have some decisions to make.
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post #12 of 12 (permalink) Old 02-19-2017, 10:36 AM
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The # on the heads is:1387.
I would sell the heads and buy something else. If you angle mill the heads (Flat mill will not get you enough)you may also need to mill the Intake manifold to fit or have the face of the heads milled to fit the intake. as going from 72cc to 58-61cc is a lot. If you have stock pistons and are going to use them with AFR 185 heads you normally need to cut the valve reliefs, the previous owner may have already done this.

Last edited by cmefly; 02-19-2017 at 11:06 AM.
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