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[Tigers] aluminum heads

To: Tigers@autox.team.net
Subject: [Tigers] aluminum heads
From: rab65tiger@aol.com
Date: Mon, 16 Jun 2008 22:50:07 -0400
My reading indicates cast iron heads may be superior for performance, IF flow 
numbers are the same, and some real world factors like hardened valve seats for 
unleaded gas are included, higher octane gas, the cast iron may be superior to 
aluminum heads.? The recent explosion of available aluminum heads with newer 
designs, typically out flow stock vintage cast iron heads, and the included 
hardened valve seats are a bonus.? The cost of port and polish and adding 
hardened valve seats to cast iron heads, combined with some weight savings, and 
maybe the possibility of running a little more compression without race gas 
seems to make aluminum heads an easy and cost effective solution. The after 
market is probably swamped with aluminum heads do to a lower cost to design, 
manufacture and machine compared to cast iron.? One caveat on Tigers, many 
aluminum heads are dimensionally different than OEM castings, making firewall 
clearance and header/ exhaust interface a concern.? Some aluminum heads utilize 
stock dimensions and exhaust port locations, some alter these dimensions.? Some 
headers offer different size tubes, that may align better with the exhaust 
ports on non stock heads.

Randie
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