LTX and LSX Putting LT1s, LS1s, 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.

iron head lt1

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Old 07-19-2007, 09:27 PM
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iron head lt1

How much lift can the stock iron head valve spring take?
Old 07-28-2007, 11:13 AM
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Car: 89 IROC
Engine: 95 350 LT1
Transmission: 4L60E
Re: iron head lt1

check out the impalass forums. They have all the good iron head LT1 info
Old 08-23-2007, 04:56 PM
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Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
Axle/Gears: 4.71
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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