Cannot Find A Aftermarket Head
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Senior User
Joined: Sep 2003
Posts: 101
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From: Houma,La
Cannot Find A Aftermarket Head
I Need Some Help Finding A Better Head Than The Stock One I Have Now.i Had Ordered The Big P.a.w. Catalog And All It Had Pretty Much Was Different Cams But Not A Head.should I Just Port And Polish The One I Have Now.any Suggestions Would Be Greatly Appreciated.
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Joined: Dec 1999
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From: Copley, OH
The only aftermarket head for the 300 is a drag-race only piece made by Allan Johnson. It has no water jackets so it is not streetable, costs $8000 and requires a custom cam since it changes the order of the intake and exhaust valves.
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Joined: Dec 2003
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From: Centerville, Iowa
Make sure you talk with somebody who's done all that before, or else you could hurt your engine. Your 300 is designed for low-end...so if you port too much at the wrong place, you can ruin your low-end power. Inside the head removing material could bump your engine up to a 5.0 though =)
As said..consult with somebody about how to do the porting..and where to port. I'd think you mght just polish around the intake, and do your porting on the exhaust side. Throw in some headers, a single high-flow cat, and straight 2.5 inch pipes all the way back...and you've got a nice exhaust. Bolt in a home-made CAI with a polished intake and large-bore TB...and you're well on your way.
As said..consult with somebody about how to do the porting..and where to port. I'd think you mght just polish around the intake, and do your porting on the exhaust side. Throw in some headers, a single high-flow cat, and straight 2.5 inch pipes all the way back...and you've got a nice exhaust. Bolt in a home-made CAI with a polished intake and large-bore TB...and you're well on your way.
Posting Guru
Joined: Dec 2003
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From: Centerville, Iowa
That all depends on how much is removed, how good he is with it all, how the engine reacts.
The thing is, the porting and polishing could hurt his low-end torque a tad, and end up bumping his powerband higher - but his cam isn't set up to take a higher powerband very well.
Like I said..he'd have to talk to somebody truely experienced in the P&P technicalities.
You can pick up anywhere from 5-25 HP easily with a Port/Polish job. Maybe more on a big cube (460) engine. You also get better responsiveness because your intake and and exhaust are all polished so that they restrict flow less.
The thing is, the porting and polishing could hurt his low-end torque a tad, and end up bumping his powerband higher - but his cam isn't set up to take a higher powerband very well.
Like I said..he'd have to talk to somebody truely experienced in the P&P technicalities.
You can pick up anywhere from 5-25 HP easily with a Port/Polish job. Maybe more on a big cube (460) engine. You also get better responsiveness because your intake and and exhaust are all polished so that they restrict flow less.
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Joined: Dec 2003
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Personally, on a daily driver I only remove flash and smooth contours when I port a head. Maybe remove any valve shielding in the combustion chamber while you're at it but hogging out the ports in an engine that hits peak HP in the mid 3s will do nothing unless a cam is made custom for it. I wouldn't go for the glass surface on the intake ports; that works great on high rev engines, but you will benefit more from better atomization from a slightly rough surface.
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