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  #1  
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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  #2  
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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  #3  
Old 30th November 2012
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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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Quote:
Originally Posted by mrmom9r View Post
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.
Thanks for the reply.
Yes I know what you are saying about the EVO port size and velocity.
I guess I should have asked what you didn't like about the 70 and 71 heads.
As far as I knew the only difference was the Int. Valve size and the 71's don't have the 3 fins.
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Old 30th November 2012
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Quote:
Originally Posted by mrmom9r View Post
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".

Did i read correctly to mean the same size intake and exhaust for the Nitro motor? If so, is there something about Nitro that influences that? steve
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Old 30th November 2012
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I read a book by Smokey Yunick, where he said he used to put epoxy in his intakes so that he could shape them how he wnated them. Probably not a great idea from a longeviity standpoint, but it might be a good thing for experimenting with different port shapes on a flow bench.
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Old 30th 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 30th 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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thank's for your reply,mrmom9r.
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