55 series head December 30, 2012 01:34PM
When u have a 40 series 466 block and u want to put a 55 series head on it, what all do u need?
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Re: 55 series head December 30, 2012 04:30PM
New bolts and head gasket
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Re: 55 series head December 31, 2012 11:17AM
I mean do you need 55 series push rods or will the 40 series work?
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Re: 55 series head January 01, 2013 04:41AM
Everything bolts up and works but your comp ratio will be way low , may be won't start
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Re: 55 series head January 01, 2013 07:48AM
Quote
111249
Everything bolts up and works but your comp ratio will be way low , may be won't start

I thought it was the opposite.. you gain compression when bolting a 55 series head on 40 series block/piston
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Re: 55 series head January 01, 2013 07:52AM
A 55 series head has a 20cc cumbustion chamber in the head. A 40 series head is flat. So yes you will loose compression when putting on a 55 from a 40 series.
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Re: 55 series head January 01, 2013 07:54AM
Did not know that .. Thanks!
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Re: 55 series head January 01, 2013 02:11PM
well what do u do about the compression ratio? how do you cure that problem?
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Re: 55 series head January 01, 2013 02:20PM
It will start just fine. Leave it alone.
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Re: 55 series head January 01, 2013 04:20PM
so i can put one on my block and have no troubles.
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Re: 55 series head January 01, 2013 05:00PM
We put one on 3 years ago. No problem yet.
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Re: 55 series head January 02, 2013 01:39PM
My rough math has cylinder volume on a 466 ci engine as somewhere around 1270ccs. I'm taking a pure guess because I don't know the Deere specs but if it's for example roughly 18:1 compression stock, that's 1270 cylinder volume + 75cc bowl = (1345 cc air volume) / (75 cc bowl) = 17.9:1 compression ratio.

Add a 20cc dish in the head, now you have 1365 cc volume / 95 cc bowl = 14.3:1 compression ratio.

Should still start, plus now you're ready to put in more air and fuel. Just my 2 cents.
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Re: 55 series head January 02, 2013 02:09PM
i think run good at open rpms it will probably not hang in good at lower engine speeds
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Re: 55 series head January 03, 2013 03:36AM
I just got a 466 block out of a 6620 combine so does that have a 40 series head?
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Re: 55 series head January 03, 2013 10:00AM
Depends on what year the 6620 was. If it was a "79-82 was a 40. 83-88 was a 50 and from 88 or 89 it was a 55 series. The 6620 Titan II was made mid 85 to 89 and had a green roof. Older 6620's had the yellow roof. Hope this helps.
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Re: 55 series head January 07, 2013 04:06AM
Thanks was the 50 series head a flat based head?
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