Not_An_Abba_Fan
Exhaust Guru
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- Aug 18, 2006
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I agree with the above, you would be battling to get 300hp let alone 400. 400rwhp is expensive. I built a 355 not that long ago but kept the standard heads and banana intake. Never got it dyno'd but just by feel, I reckon it was under 300.
The standard computer can handle it, a few people are really good at tuning them. The one I built already had a Haltech. I didn't mind it, but not many people can tune them.
Hydraulic cams aren't that bad. Flat tappet is more of a worry, I munched 2 cams because of issues starting it. Go roller. I read an article on a guy that built a 5.0L in a Mustang and had valve float at anything above 5000rpm. Worked out that the solid lifters were not letting the valves close properly, changed to hydraulic lifters and the damping let it rev cleanly to 8000rpm. Different engine, but interesting to read.
The standard computer can handle it, a few people are really good at tuning them. The one I built already had a Haltech. I didn't mind it, but not many people can tune them.
Hydraulic cams aren't that bad. Flat tappet is more of a worry, I munched 2 cams because of issues starting it. Go roller. I read an article on a guy that built a 5.0L in a Mustang and had valve float at anything above 5000rpm. Worked out that the solid lifters were not letting the valves close properly, changed to hydraulic lifters and the damping let it rev cleanly to 8000rpm. Different engine, but interesting to read.