[Fot] Spitfire cylinder head - which is best?

[Aaron Johnson]

What I found with all spitfire heads is that you really have to look at each one independently.  Some of the factory machining is really really bad.  All the heads have about a .3"-.5" machined portion where they put a diameter for the intake and the rectangle for the exhaust.  There is huge mismatch between this and cast port on some which left a giant step.  

I use the 1.44" valve heads only. 

Aaron

Sent from my iPhone

> On 03-Sep-2016, at 5:57 PM, Joe Curry <spitlist at cox.net> wrote:
> 
> The intake valves are 1-7/16" in diameter as opposed to other 1500 heads
> that use 1-3/8".  With the larger valves, one has to assume that the engine
> is able to breathe more effectively.  The exhaust valves are the same on all
> 1500 heads.  Of course breathing entails all other components of the intake
> and exhaust systems so your results may vary.
> 
> Joe C.
> 
> Sent from my HAL-9000
> -----Original Message-----
> From: Ashley Page [mailto:apage at prosystembrakes.com] 
> Sent: Saturday, September 03, 2016 4:47 AM
> To: Joe Curry
> Cc: don at dcphotos.com; fot at autox.team.net
> Subject: Re: [Fot] Spitfire cylinder head - which is best?
> 
> How did you determine it flows better? 
> What valve diameter did you end up using?
> Thanks!
> 
> Sent from my iPhone
> 
>> On Sep 2, 2016, at 7:35 PM, Joe Curry <spitlist at cox.net> wrote:
>> 
>> I am using one of the early 1500 heads with the larger valves cut down for
>> my small journal 1296.  It breathes a lot better than the other options.
>> 
>> Joe C.
>> 
>> Sent from my HAL-9000
>> -----Original Message-----
>> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of
> don at dcphotos.com
>> Sent: Friday, September 02, 2016 1:42 PM
>> To: fot at autox.team.net
>> Subject: [Fot] Spitfire cylinder head - which is best?
>> 
>> Greetings, 
>> Somewhere, sometime ago, I read one cylinder head casting number for a
>> Spitfire 1300/1500 was made of better metal than the others?
>> Don't know if there is any truth to this or not and, of course, now I
> can't
>> find that info anywhere.
>> 
>> Anyone here know?
>> 
>> Don
>> DON COUCH PHOTOGRAPHY
>> (512)-680-3540
>> 
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