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Tractor Pulling Discussion Forum

IH 400 vs. 450 Heads

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1000yds

05-06-2007 15:19:23




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A couple more rookie questions. Is there any real difference between a 450 and a 400 head ? Also, when you are talking about hard blocking does this mean no head gasket? Thanks!




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turbos10

05-08-2007 16:17:54




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 Re: IH 400 vs. 450 Heads in reply to 1000yds, 05-06-2007 15:19:23  
Hardblock is used to fill within an inch of the deck to stabilize the cylinders. Cooling is not affected a whole lot since most of your cooling takes place in the heads and top of the cylinders. I would not do it in a farm tractor but for pulling it is fine. I did it in my 4.25" bore M.

I am curious about the 8574 head being considered high compression. We cc'ed them and ended up with 6.5:1 CR with a flat top in a 300 inch M. My understanding is that they are low compression heads. Mine certainly is and has huge chambers. The valves were actually shorter than some other heads due to this. Maybe mine an oddball...

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CPR

05-07-2007 16:28:42




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 Re: IH 400 vs. 450 Heads in reply to 1000yds, 05-06-2007 15:19:23  
I'm curious on this issue, too. I have an 8060 head now, is this sufficient for a ba!!z-out engine, or is there a 450 casting I need to look out for? What is the 450 head that Lemmons is advertising?

Thanks,

CPR



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BF8690

05-07-2007 22:27:55




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 Re: IH 400 vs. 450 Heads in reply to CPR, 05-07-2007 16:28:42  
The 8060 is OK. The 8574 is better, it is the head that came on the X1 M's. X1 is the suffix at the end of the serial number. It stand for high compression gas. The 8574 flows better but you can't really tell a difference just by looking. I think the 8060 is a dual fuel head which is not as high of a compression ratio as the 8574. What part of the country are you in? Email me.



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BF8690

05-06-2007 19:58:00




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 Re: IH 400 vs. 450 Heads in reply to 1000yds, 05-06-2007 15:19:23  
What really matters is not what tractor the head is off of but what the casting number is. M's, 400's, and 450 had the same head at times. All of these had the 8574 which came with the X1 M's. Some of the 400's and M gas burners had the 8060 head as well. What state do you live in?



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1000yds

05-07-2007 14:23:36




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 Re: IH 400 vs. 450 Heads in reply to BF8690, 05-06-2007 19:58:00  
Ohio.



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BF8690

05-07-2007 22:22:59




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 Re: IH 400 vs. 450 Heads in reply to 1000yds, 05-07-2007 14:23:36  
Email me.



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The Preacher

05-06-2007 18:25:17




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 Re: IH 400 vs. 450 Heads in reply to 1000yds, 05-06-2007 15:19:23  
Not sure about the heads. But, hardblocking means filling the water jackets in the block with a hard concrete-like substance. It adds rigidity to the block around the cylinders when the block has been bored out to accept MUCH larger pistons. The bores are often bored out until the cylinder wall will no longer support the forces of combustion or piston movement. They need to be reinforced or bad things will happen! The downside is that coolant can no longer flow around the cylinders and cool them, so the engine can not be used for long periods of time without the engine over-heating. Some people will only hardblock the cylinder block up about halfway. This way, you get the benefits of hardblocking without sacrificing too much cooling ability. Unless your building an all-out bad-a$$ engine, I wouldn't recommend hardblocking, as it's a permanent addition to your engine. I hope this helps. Try asking Chads or Champspa about the head.

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