240 or 300 head identification
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Freshman User
Joined: Oct 2010
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From: Alberta, Canada
240 or 300 head identification
I need help identifying a couple heads. I am rebuilding my 77 300, and I have a spare head off of an 82 300. The heads are identical with the exception of the combustion chambers. The head on the 77 300 I am rebuilding, has a D shaped combustion chamber, and the head on my spare 82 300 has a kidney shaped contribution chamber. Is it possible that some 300 heads had the kidney shaped combustion chambers. The casting # on the spare head with the kidney shaped chamber is too distorted to make out.
Lead Driver
Joined: Mar 2008
Posts: 7,182
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From: Near Los Angeles
Without a doubt, the kidney bean shaped chambers are on a 240 head. Using a stock 240 head on a 300 is a trick a lot of builders use to boost the compression a bit, about a half point. If you put a 240 head on a 300 with 9.0:1 compression, it will be raised with the 240 head to 9.5:1. If the head has been milled, then the c.r. will go up, depending how much it was shaved.
That's a nice find.
Here is a 300 chamber:
And here is a 240:
That's a nice find.
Here is a 300 chamber:
And here is a 240:
Thread Starter
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Freshman User
Joined: Oct 2010
Posts: 47
Likes: 4
From: Alberta, Canada
Thanks!
I was hesitant to believe it was a 240 because it came off of my spare 1982 300 from a F350 truck, also the head has the bumps in the exhaust ports, and I read somewhere the 240 head had a temp inlet, which this one dose not.
I was hesitant to believe it was a 240 because it came off of my spare 1982 300 from a F350 truck, also the head has the bumps in the exhaust ports, and I read somewhere the 240 head had a temp inlet, which this one dose not.
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