240 / 300 Head

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Jun 1, 2003 | 05:50 PM

lrac

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Joined: Feb 2001

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From: Anderson, SC.

240 / 300 Head

Other than increasing the compression ratio by using the 240 cid head on my 300, are there other advantages/dis-advantages to take into consideration. Am I right in figuring that if the 240 had a compression ration of 9.2 then that head on a 300 would give a ratio of 11.5?

Thanks for any advise,

Jun 1, 2003 | 06:49 PM

chuckman

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Joined: Apr 2002

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From: St. Louis, MO USA

240 / 300 Head

theres a good explain of what kind of comp you can expect over at FSP, heres a linky:

http://fordsix.com/forum/viewtopic.php?t=5343

hope that helps

Jun 23, 2008 | 03:50 PM

Iman901

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From: KFalls

Im not sure it would be that high, 300s came with really low compression- like in the 7s- for emissions reasons

Jun 23, 2008 | 05:29 PM

Harte3

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Joined: Dec 2006

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From: Spokane, WA

I think the lower cr's came in the HD engines that were used in heavy trucks like 2 ton type farm trucks.

Jun 26, 2008 | 11:52 PM

Iman901

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From: KFalls

sorry about that, I was looking at a chart of CPs in a manual, the low ones were actually from a 360V8.
I just read in another post that the 300EFI head had the same size chamber as the 240 plus its a more efficient design.