Lt1 Vs Ws6 Heads
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From: POULSBO WA.
Lt1 Vs Ws6 Heads I recently picked up a 97 ws6 motor lt1 and was considering swapping the heads I hear they flow 30 horse more than my 93 heads from the factory. Would it be worth the effort to do, along with the cc503 cam? Or should I slap down 1500 to have the 93 heads done? how much more will the ws6 heads flow over the 212 cfm of the 93 heads? thanks.
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In all reality 94-97 LT1s make the around the same RWHP. It is just how gm put it out. Would you by a car that came with more emissions and a second cat if it was the same HP rating as the ones that didn't have it. just like the C5 being rated at 350hp and the TA being rated at 305
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There are 3-4 different casting numbers for the LT1 heads from 92-97 all of which flow basically the same. The difference between some of them has to do with the thickness of the castings and angle of the plugs. What you really want to find is castings that end in 374 as they have more material in the castings which allows you to do more port work.
If you pulled these off of a 97, then your casting numbers probably end in 561 which are the thinner castings.
10128374 = Gen.II LT1, 53cc, angle plug, aluminum, reverse flow cooling, 175/68cc ports
10205245 = Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
10207643 = Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
12551561 = Gen.II LT1, aluminum
If you pulled these off of a 97, then your casting numbers probably end in 561 which are the thinner castings.
10128374 = Gen.II LT1, 53cc, angle plug, aluminum, reverse flow cooling, 175/68cc ports
10205245 = Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
10207643 = Gen.II LT1, aluminum, reverse flow cooling, 175/68cc port volumes
12551561 = Gen.II LT1, aluminum
Originally Posted by FAD2BLK93
My no. end in the 561 so are you saying they flow the same from the factory...but you cant port the 561 as much as the others?
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Joined: Jul 2005
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From: Midland
Originally Posted by FAD2BLK93
My GM catalog says no. different part no. If that is so how come the 96 and 97 had different power ratings with basically the same cam.
