Increase compression ratio? - 460 Ford Forum
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post #1 of 6 (permalink) Old 02-10-2010, 12:31 AM Thread Starter
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Question Increase compression ratio?

What is the easiest and best way to increase my compression ratio? I have a 460 out of a 1986 F350. Can I just mill the heads? If so, how much without going to adjustable overhead? What about just changing the pistons? I am looking for about 10:1 at the end. Thanks for the help.
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post #2 of 6 (permalink) Old 02-11-2010, 10:10 AM
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the easiest way imo is to get a set of c8,c9 or dove heads.Randy.
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post #3 of 6 (permalink) Old 02-11-2010, 12:12 PM
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You can mill the current heads .020 without any changes in the valvetrain required, but that will only raise the compression by .2 of a point.

Milling the heads .020, installing flat tops and zero decking will get you about 9.6:1.

Installing early small chamber heads on the current setup will get you about 10:1, but will require a different valvetrain.

Installing dome pistons with the current heads, no other machine work, and no change in valvetrain will get you about 10.5:1.

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Last edited by CarsByCarl; 02-11-2010 at 12:19 PM.
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post #4 of 6 (permalink) Old 02-27-2010, 08:47 PM Thread Starter
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Originally Posted by CarsByCarl View Post
You can mill the current heads .020 without any changes in the valvetrain required, but that will only raise the compression by .2 of a point.

Milling the heads .020, installing flat tops and zero decking will get you about 9.6:1.

Installing early small chamber heads on the current setup will get you about 10:1, but will require a different valvetrain.

Installing dome pistons with the current heads, no other machine work, and no change in valvetrain will get you about 10.5:1.
Thanks, I like the idea of changing the pistons vs messing with the milling and head work.
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post #5 of 6 (permalink) Old 03-09-2010, 06:51 PM Thread Starter
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the easiest way imo is to get a set of c8,c9 or dove heads.Randy.
Is it as easy as bolting on the right heads and leaving everything else alone? I understand DOVE heads. What do you mean by C8 and C9 heads?

Thanks, Tony
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post #6 of 6 (permalink) Old 03-09-2010, 07:23 PM
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Originally Posted by TonyS View Post
Is it as easy as bolting on the right heads and leaving everything else alone? I understand DOVE heads. What do you mean by C8 and C9 heads?

Thanks, Tony
C8 and C9 are essentially the same as D0VE heads and can be bolted on in place of the current heads, but they will require different rockers, etc. than the later D3 style heads.

Be sure to consider the cost of the early heads, machine work to make them right (hard seats, valve job, guides), new valvetrain, etc. and compare it to the cost of pistons, balance work, pressing rods on the pistons, etc.

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