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Old 08-13-2003, 01:18 PM
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71's olds 455

2 questions.......1 - what is the max lift the stock valve springs can handle?.......2- what is the stock compression ratio?


came out of a 71' olds Delta 88, if it makes a difference

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Old 08-13-2003, 03:47 PM
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the compression is about 11 or 12, if you are using a harmonic balancer if not, its about 8.3...the valve springs can hanlde 3 inches of lift but only if you port and polish the cylinders to increse displacement and also put the intake manifold on with the thermostat facing the rear of the motor for improper cooland flow resulting in more valve to piston clearence
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Old 08-13-2003, 06:52 PM
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71 was the first year of GM's across the board compression cut so you are probably looking at 8.5-9 to 1 compression ratio, as for stock springs I wouldn't go any more than about .470-.480 lift any more and you will be hitting on the guides and destroying the seals. These are torque motors not rpm.
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