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Old 06-18-2004, 00:06   #1 (permalink)
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400 compression

I think from memory the compression on the 400 with flat top pistons is 9.0:1 with open chamber heads (someone correct me if i'm wrong).

What would the compression be if I installed 302 closed chamber heads on it? I'm thinking it would be too high for 98 octane but not entirely sure.
Any ideas?
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Old 06-19-2004, 01:41   #2 (permalink)
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Re: 400 compression

not a clue. but its not hard to work out if you have the clearance volume and know how many cc,s the chamber of the head is
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Old 06-19-2004, 02:29   #3 (permalink)
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Re: 400 compression

Just be sure to work it out carefully because the 4" stroke can really pump up the compression,more so than a 351..
One i was involved with with 351 flat tops and 302 heads was close to 12:1...The reason being i believe is the original 400 pistons are a fair way down in the hole..
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Old 06-21-2004, 00:13   #4 (permalink)
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Re: 400 compression

I worked out on a CR calculator with:
59cc combustion chamber volume
-6.5cc piston volume
Gasket thickness 0.040
Piston .010 below deck?? not sure with this one I guess it depends on piston height?

Works out CR of 11.86:1..........still too high.

Can I get pistons with more negative volume?

Gives me
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Old 07-23-2004, 22:15   #5 (permalink)
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Re: 400 compression

I have a complete 400 I am going to sell if you need an extra. $130 + ship. all there except carb and distributor. I got pics.
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Old 07-24-2004, 05:17   #6 (permalink)
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Re: 400 compression

Already have one.
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Old 08-07-2004, 05:36   #7 (permalink)
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cool Re: 400 compression

Quote:
Originally Posted by shooterpcb
I have a complete 400 I am going to sell if you need an extra. $130 + ship. all there except carb and distributor. I got pics.
im interested
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