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LTX and LSX Putting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.

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Old 07-19-2007, 10:27 PM   #1
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iron head lt1

How much lift can the stock iron head valve spring take?
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Old 07-28-2007, 12:13 PM   #2
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Car: 89 IROC
Engine: 95 350 LT1
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Re: iron head lt1

check out the impalass forums. They have all the good iron head LT1 info
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Old 08-23-2007, 05:56 PM   #3
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Car: 88 iroc-z/28
Engine: 408 lsx
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Re: iron head lt1

about .480 is going to be the max. you might be better off staying around .460 if the motor has miles on it.
rule of thumb... cam AND springs.
dont shortcut if you want the most power and reliability.
good luck.
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Old 08-23-2007, 05:56 PM
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3rd, body, gen, head, iroc, iron, lsx, lt1, spring, springs, valve
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