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428 on 87 octane

 
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Old 03-20-2004, 10:15 AM
Goodold71
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Question 428 on 87 octane

Is there any way to make a 428 run good on 87 octane?
 
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Old 03-20-2004, 11:02 AM
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I guess it all depends on how much compression your running?

Depending on compression..you can aleays retard the timing a few degrees... but you will lose a little HP and torque!

Good luck!! Russ!
 
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Old 03-20-2004, 01:02 PM
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How might I go about running 9:1 compression or 8.5:1 compression . Do I buy pistons that are this compression ratio or what ?
 
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Old 03-21-2004, 12:25 AM
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You can buy pistons with a larger dish, or use a thicker head gasket....a cam with a little more overlap will also work...lots of ways to do it...d44hd
 
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Old 03-21-2004, 08:31 AM
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You could also modify the combustion chamber and unshroud the valves to gain CC's there. That will lower the compression ratio and also help put back some of the power that the lower compression ratio will lose. While you're in there, polish the combustion chamber. Theory is that it makes the carbon not stick as easily. Also free's up some CC's.
 
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Old 03-21-2004, 10:18 AM
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I don't see why it wouldn't run with higher compression, the 10.25 to 1 comp ratio 390 runs fine on 87 octane. Initial timing is 12 degrees, heads are C8AE-H's ( completely stock),pistons are the original cast flat-tops cam is a Crane 272 degree Energizer, intake is a 428PI with a 750 Holley. We use 87 octane mixed every other tank with CD-2 lead substitute.
 
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Old 03-21-2004, 01:08 PM
MudinMan19704x4
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go buy 5 gallons of racing fuel and ad one gallon in every tank I bet it'll help but.......... what do i know.......
 

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