q about new heads...

jst6

Founding Member

Jan 9, 2002

152

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0

Tucson, AZ

Apr 19, 2005

#1

• Apr 19, 2005

• #1

The little 289 in my car have the stock heads and I want to upgrade the heads ASAP. My biggest question is can I go with a 2.02/1.60 valve size and not hit the stock flat top piston? I don't want to be forced to buy new pistons to accommodate as that would mean an entire rebuild (one of those "while I’m doing this" type of things. Or would anyone suggest a 1.90/1.60 valve like the performer rpm head?

 

LMan

Founding Member

Aug 10, 2002

1,246

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Mom's basement

Apr 19, 2005

#2

• Apr 19, 2005

• #2

Id change your rear gears before I fooled with heads. You'll want a new cam then, anyway.

Rear gears, headers, carb, heads+cam.

 

D

D.Hearne

New Member

Sep 29, 2000

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south louisiana

Apr 19, 2005

#3

• Apr 19, 2005

• #3

Another thing to watch for when head shopping ( for aluminum heads) is combustion chamber size. When swapping to aluminum, you want to increase the comp ratio, and all aftermarket aluminum heads have larger chambers than the 289's 54 cc heads. This will lower not raise the ratio. The smallest chambers offered for most heads is 58 cc. Which means you need to mill them to get them down to at least 54 cc for a 289. Most pistons have valve reliefs for up to 1.94/1.60 valves, very few accomodate 2.02's.You're better off anyway with the smaller valves on a 289.

 

WantaGT

Member

Jul 13, 2003

336

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ohio

Apr 19, 2005

#4

• Apr 19, 2005

• #4

here's a thought, a cheap one too. i'm having Thumper (just search Thumper in the 5.0 forums) port and polish my heads, intake, exhaust, bowls and milled to 50cc for $500 bucks. That might free up some money for gears and the such.

 

65ShelbyClone

Founding Member

Sep 9, 2000

4,675

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119

Antelope Valley, SoCal

Apr 19, 2005

#5

• Apr 19, 2005

• #5

I too would recommend 1.90/1.60 valves. Most mainstream aftermarket aluminum heads have a chamber around 60-61cc.

 

coolblue65

Founding Member

Jul 26, 1999

1,224

2

39

Algonquin, IL

Apr 19, 2005

#6

• Apr 19, 2005

• #6

The only head that you can for sure get 2.02" intake valves with and have flat top pistons without worrying are Trick Flows.

 

A

A67auto

New Member

Jul 21, 2003

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Sacramento,CA

Apr 20, 2005

#7

• Apr 20, 2005

• #7

coolblue65, I checked out your site and it was cool, I also checked out your page where you installed the trick flow heads and noticed that you drilled the block, what was it that you were drilling and why? I have a set of trickflows that I am going to be putting on my motor pretty soon and I did not know you had to drill anything.. Thanks

 

HistoricMustang

Active Member

Apr 11, 2003

2,359

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Confederate States of America

Apr 20, 2005

#8

• Apr 20, 2005

• #8

65ShelbyClone said:

I too would recommend 1.90/1.60 valves. Most mainstream aftermarket aluminum heads have a chamber around 60-61cc.

Click to expand...

I am in the 1.90/1.60 boat also.

HistoricMustang
www.historicmustang.com

 

coolblue65

Founding Member

Jul 26, 1999

1,224

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39

Algonquin, IL

Apr 20, 2005

#9

• Apr 20, 2005

• #9

A67auto said:

coolblue65, I checked out your site and it was cool, I also checked out your page where you installed the trick flow heads and noticed that you drilled the block, what was it that you were drilling and why? I have a set of trickflows that I am going to be putting on my motor pretty soon and I did not know you had to drill anything.. Thanks

Click to expand...

It depends on what block you have, if you actually have the heads already, it is explained in the directions (I know who reads those ). Its basically necessary for the early blocks. The only way you will no for sure is when you pull your old heads off and if you see the 4 little holes there already, then you wont have to drill. If you have to, use the gasket to mark where to drill at-just get a couple of good drill bits and it will go quick.