400 heads
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Laughing Gas
Joined: Mar 2016
Posts: 757
Likes: 43
From: Cheyenne, Wy
400 heads
Hello all.
My local jy recently brought in an April 72 galaxy500 with a 400. So here is my question. Would the heads from the 72 400 have better comp ratio than the heads on my 79bronco 351m or better than the heads on my 79 400 f150?
I thought I would ask here first but if I need to I will post in the 335 engine section. Thanks for the help.
My local jy recently brought in an April 72 galaxy500 with a 400. So here is my question. Would the heads from the 72 400 have better comp ratio than the heads on my 79bronco 351m or better than the heads on my 79 400 f150?
I thought I would ask here first but if I need to I will post in the 335 engine section. Thanks for the help.
Logistics Pro
Joined: May 2010
Posts: 4,436
Likes: 19
From: Regina, Saskatchewan
Hello all.
My local jy recently brought in an April 72 galaxy500 with a 400. So here is my question. Would the heads from the 72 400 have better comp ratio than the heads on my 79bronco 351m or better than the heads on my 79 400 f150?
I thought I would ask here first but if I need to I will post in the 335 engine section. Thanks for the help.
My local jy recently brought in an April 72 galaxy500 with a 400. So here is my question. Would the heads from the 72 400 have better comp ratio than the heads on my 79bronco 351m or better than the heads on my 79 400 f150?
I thought I would ask here first but if I need to I will post in the 335 engine section. Thanks for the help.
351M/400 Performance Build Up
Grumpy goat
Joined: May 2017
Posts: 3,059
Likes: 597
What I've read says the 400 was 9.5:1 until 1973 when it went to 8:1. However, I don't know what they did to change the ratio. Was it dish pistons, or larger combustion chamber? I also read that combustion chambers ran from roughly 74cc to 80cc. It might be worth it to pull those heads and measure the volume.
Logistics Pro
Joined: May 2010
Posts: 4,436
Likes: 19
From: Regina, Saskatchewan
What I've read says the 400 was 9.5:1 until 1973 when it went to 8:1. However, I don't know what they did to change the ratio. Was it dish pistons, or larger combustion chamber? I also read that combustion chambers ran from roughly 74cc to 80cc. It might be worth it to pull those heads and measure the volume.
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78bigbronco
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
18
Mar 28, 2003 05:58 PM
muddawg
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
10
Jan 31, 2002 04:07 PM
