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Old 05-27-2009, 01:35 PM   #1 (permalink)
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Ford 300 4.9L

I am currently building a High Performance 300 6 cyl. and would like to know where I can find an aluminum head, or one of those australian crossflow heads. Also, what are the best pistons to achieve power, Ford V8 351, 360, or 390? or dodge like I heard from someone. Thanks for the help.
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Old 05-27-2009, 04:11 PM   #2 (permalink)
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Re: Ford 300 4.9L

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Originally Posted by whampton1 View Post
I am currently building a High Performance 300 6 cyl. and would like to know where I can find an aluminum head, or one of those australian crossflow heads. Also, what are the best pistons to achieve power, Ford V8 351, 360, or 390? or dodge like I heard from someone. Thanks for the help.
The Aussie x-flow is based on the small Ford I6, 144/170/200. Even the 250 (4.1) x-flow is based on the 200 and not on the slightly different US 250. The head wouldn't even come close to fitting the much longer 300. There used to be an alloy head on the market for the 300 that was based on the 351C head. The head was a build-to-order, race-only head that required a custom built intake and exhaust.
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Old 05-27-2009, 05:10 PM   #3 (permalink)
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Re: Ford 300 4.9L

I think Alan Johnson makes the only aluminum heads at the moment and they're billet race only heads.

Alan Johnson Performance : AJPE 4.9 liter 6 Cylinder Ford Race Head
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Old 05-27-2009, 06:53 PM   #4 (permalink)
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Re: Ford 300 4.9L

[quote=BlueOvalBandit;1498775]I think Alan Johnson makes the only aluminum heads at the moment and they're billet race only heads.

Alan Johnson Performance : AJPE 4.9 liter 6 Cylinder Ford Race Head[/q

Last edited by whampton1; 05-27-2009 at 06:53 PM. Reason: made mistake
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Old 05-27-2009, 07:24 PM   #5 (permalink)
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Re: Ford 300 4.9L

Alan J head was /is listed in the Ford racing catalog. as for the best piston, custom made
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Old 05-28-2009, 10:40 PM   #6 (permalink)
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Re: Ford 300 4.9L

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Originally Posted by whampton1 View Post
I am currently building a High Performance 300 6 cyl. .... what are the best pistons to achieve power, Ford V8 351, 360, or 390? or dodge like I heard from someone. Thanks for the help.
Stock 300 is a 1.767 CH with a .975 pin. As such the 390 piston (Probe 14833) is the closest to it with a 1.765 CH and the .975 pin but this requires you to be able to go to a 4.080 bore (doubtful on a stock block but I'm no 300-6 expert).

The Probe 12355 piston is a 4.030 bore 1.772 CH but a .912 pin so you would have to have the rods bushed and, assuming a stock piston puts you at zero deck, would put the piston .005 out of the hole (which is fine).

Other than that you're looking at a custom piston or settling for a hyper from KB if you use stock crank and rods.

You could also look for different rods which may require offset grinding of the crank and/or bushing/boring the little end to fit whatever pin size you come up with. You also have to be concerned with big end width when looking at different rods.

There may be other pistons from manufacturers other than what you find on Summit or from Probe so look around for a piston with a.975 pin and something very close to 1.767 CH. You can adjust the block if you find something that is .010 shorter or you can go as much as .010 out of the hole if need be.

So I guess to sum all this up, you have no easy choices for a forged piston but with a bit of inventiveness you can find a combination that will work, its all about the dimensions.

Also keep in mind that the valve reliefs may be all wrong so you may have to flycut whatever you find. All this stuff makes the cost of a custom piston look better and better.
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Old 05-29-2009, 11:17 AM   #7 (permalink)
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Re: Ford 300 4.9L

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The Probe 12355 piston is a 4.030 bore 1.772 CH but a .912 pin so you would have to have the rods bushed and, assuming a stock piston puts you at zero deck, would put the piston .005 out of the hole (which is fine).
FYI, I believe the early 300 rods used a .912 pin. It shouldn't be that hard to find a set.
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Old 05-30-2009, 09:32 PM   #8 (permalink)
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Re: Ford 300 4.9L

Go to Fordsix.com. There is info on alum head development by 2 individuals, both can be used on the street. One is by cutting/welding chevy ls1(?) heads, making a crossflow head, but you must make your own intake/exhaust. Pics are available of this setup. 90 deg distributor body must be used. The other is a 'work-in-progress' head that will use available intakes/exhaust. There's a lot of info on the site about pistons/rods/etc.
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