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Old 08-31-2004, 09:17 PM
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402 or 454

i have 402bb 72model with oval port heads is that motor worth anything im wanting to build a 500 horse motor i also have a buddy who has a 454 with rect heads who would swap even which route is the best to take

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Old 08-31-2004, 09:23 PM
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The old saying is "There is no replacement for displacement" I think you'll reach your goal quicker with the 454.
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Old 08-31-2004, 09:31 PM
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454

what kind of moneywould it take to reach 500 horses in a 454
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Old 08-31-2004, 09:33 PM
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reher morrison says "build the biggest motor you can" I guess I agree, unless that is the original motor??
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Old 09-04-2004, 09:13 AM
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to get 500 ponies you are going to need more compression, so that requires new pistons and probably rods while you are at it. add cam and lifters, carb and a home porting job and you will be getting warm. I would guess in the $2500-$5000 range depending on how thorough you are in the build. Put it this way you can spend as much as you want on a motor. usually more than you can afford and always twice what you expected on the onset of the project!
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Old 09-04-2004, 09:36 AM
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As stated above "Ain't no substitute for cubic inches" even the wives agree!
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Old 09-04-2004, 10:43 AM
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If your goal is 500HP, do the swap for the 454, then sell off the original square port heads and build your motor to these specs:

http://www.edelbrock.com/automotive/7161pp.html

I should have added this. The motor will be more responsive in the bottom end with the oval port heads (original or the Edelbrock heads). The Original rectangular port heads a still sought after, so you should be able to get a pretty good price for yours.

I've got plans to build a motor to these specs that will find it's home in a 77 Datusn 280Z with a Tremic T-56 behind it.

Last edited by 5foot2; 09-04-2004 at 10:43 AM.
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Old 09-05-2004, 07:57 PM
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we did a 9.5 to 1 454, stock open chamber oval port heads with bigger valves installed, an isky 280 mega hyd. cam, performer manifold and a 750 and it was 490hp on the dyno. stock crank and rods will be fine. i would build a 454 but loose the rectangle heads unless this is a strip motor. you`ll have more lower end torque with the oval ports and the won`t need a ton of work to get the power you want.

just add bigger valves, mild bowl port work and gasket match and a good valve job is all they need to make 500hp. if this is a street car, build it for low end torque with a rpm limit of about 5,500-6,000 and you`ll have fun with it. by the way, torque is what your *** feels when it`s shoved through the seat when you nail the gas. good luck.
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