400 highest build with regular gas
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Joined: Jul 2007
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If you want the most from 87 octane, then you need aussie heads or aluminum, and pistons that are designed to work with the closed chamber heads.
9.5:1 compression with 87 octane and 360hp is achievable without breaking the bank.
What you will be doing with the motor will make a big difference. Racing? Towing?
The average rebuild on a 400 will net you .8hp for every cubic inch (320hp). This is a basic rebuild with a flat lifters and stock heads.
Roller cam, closed chamber heads, & the right pistons can get you up to 380hp on 87 octane. These are numbers from motor for a Bronco that never sees 5000 RPM. If you are looking for high RPM applications I am sure you could push 420hp with the right cam, but I have never built a motor like that so I have not experience.
9.5:1 compression with 87 octane and 360hp is achievable without breaking the bank.
What you will be doing with the motor will make a big difference. Racing? Towing?
The average rebuild on a 400 will net you .8hp for every cubic inch (320hp). This is a basic rebuild with a flat lifters and stock heads.
Roller cam, closed chamber heads, & the right pistons can get you up to 380hp on 87 octane. These are numbers from motor for a Bronco that never sees 5000 RPM. If you are looking for high RPM applications I am sure you could push 420hp with the right cam, but I have never built a motor like that so I have not experience.
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killer4x4
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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Jan 26, 2002 03:03 AM
