Is GM Vortec 454 essentially the same thing as the 300-HP L29 7.4L?
#21
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Join Date: Dec 2001
Location: Rapid City SD
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I built my L-29 up using the .510/.540 magnum cam and it runs awesome! It has a little more rumble at idle but has excellent torque at 3,000 an above. I bought the cam for less than $200 and got a new single row timing chain as well and it was pretty cheap. I did install larger valves and did some minor, basic port cleanup but I think the gains were very small from that. Use a nice air gap dual plane intake and throw that 800 carb on and enjoy the summer! TBF
#24
If I was going to run this thing hard or had a ton of money invested in it, you can bet I would install the inconel valves. My "good" motor that I am building now has them.
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Sorry to not mention that but I did buy a set of brand new vortec heads with new springs installed. The spings were taller and did not use the original style valve spring rotators....... Valves were 2.19/1.88 size and I did some significant bowl blending but I don't think it helped much withheld larger valves. Springs were not very expensive, just get the stock magnum/HO stuff and use it...... Easy 500 ft/lbs of torque all day long! TBF
#30
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Sorry to not mention that but I did buy a set of brand new vortec heads with new springs installed. The spings were taller and did not use the original style valve spring rotators....... Valves were 2.19/1.88 size and I did some significant bowl blending but I don't think it helped much withheld larger valves. Springs were not very expensive, just get the stock magnum/HO stuff and use it...... Easy 500 ft/lbs of torque all day long! TBF