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Old 29th November 2012
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Default Best head casting for porting Question

What years have the best head casting for porting a 1000cc Ironhead...

I know some are very delicate to port and machine...

Valve spring pockets...etc...
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Old 29th November 2012
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That's a big question. If the displacement is 1000cc.

And you're looking for great mid-range torque with a redline of 6500 rpm.

The best casting to start with is the pre 70 900 head.

I'm sure others will have other opinions.
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Old 29th November 2012
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900 head's will have a,different bolt pattern than,1000 c.c,correct? smaller combustion chamber,3'' bore vs.,3-3/16''? fire ring fit?
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Old 29th November 2012
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Quote:
Originally Posted by brucstoudt View Post
900 head's will have a,different bolt pattern than,1000 c.c,correct? smaller combustion chamber,3'' bore vs.,3-3/16''? fire ring fit?
All those things are true and fixable. If the question was which head is easiest to do, then I gave the wrong answer.

If the question was which head can be turned into the best head for a 1000cc motor I gave the right answer in my experience.

As I said, there will be other opinions.
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Old 30th November 2012
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thank's for your reply,mrmom9r.
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Default best head casting

My question was what years will give you the best casting for porting and machining the valve spring pockets...

O-ring or rubberband style heads...

Just want to know which heads can be ported the best way without loosing any durability in every day use or on the track...

Which heads are more prone to cracks then others...which heads can receive new valve seats without any hassle. Lead free conversions...etc...
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A mrmom ported 1000cc head 'laydown D shape inlet port'
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Quote:
Originally Posted by mrmom9r View Post
That's a big question. If the displacement is 1000cc.

And you're looking for great mid-range torque with a redline of 6500 rpm.

The best casting to start with is the pre 70 900 head.

I'm sure others will have other opinions.
What is it about the pre 70 heads you like?
Is it the smaller Intake valve?
Or was the casting better?
Or was the port finishing better?
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Old 30th November 2012
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Quote:
Originally Posted by chevelle View Post
What is it about the pre 70 heads you like?
Is it the smaller Intake valve?
Or was the casting better?
Or was the port finishing better?
1000 heads have WAY too much volume as cast for a stock size motor. By the time the shape is improved and cleaned up they're way Past too big.

The small port 900's can be made to provide better velocity with adequate airflow.

Check the port size on a 1200 Evo. it's smaller than a 1000 ironhead.

As to the OP's original question: I feel-none are better to put seats in, none are better for cutting spring pockets .

there are a few different castings. I feel some of the later rubberband castings don't center the seat to the port as well.

I have only found it to be an issue when doing all out race heads for large motors with 2" intakes.

When the intake size goes above that so many things start being rearranged that it doesn't matter.

I have been as large as 2.08" intakes on gas with 1.85 exhaust.

My current fuel heads are 1.94"x 1.94".
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Old 30th November 2012
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MrMom,

Why do you use a flat floor on the port, does it increase the flow or are you using it for a turbulence point for fuel air mixture?

Sorry another question, Do you polish the exhaust ports or leave them with a 120 finish?
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