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You can check ls1tech.com for parts. There's always someone selling lsx engines and parts. Good luck.
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turns out my mockup block is an ls2 block. never really paid any attention since i thought it was trash. it has a few nicks in the deck and the front surfaces which can be welded up. ive also been told that the 5.3 blocks are stronger since there are no windows in the lower webbing. problem is this only complicates windage issues at high rpm. so, steve is telling me to use the ls2 block that i have.
i now just need to decide what i want to do and who i want to build it. im down to two builders right now and will call one more tomorrow. i have a feeling theyll be close to 20k and thats not in my budget. as far as size, i was originally quoted 1500 for a new ls3 block for a 416 and i can buy a block and get it sleeved for 2300. so for 800 bucks more i can get 454 ci. easy choice in my mind since i will regret it if i dont, plus i have friggin 600 dollar hood hinges. the problem is with the added power, the engine builders want me to add a bunch more money for better parts (dry sump, steel caps, titanium valves etc..) this will add a TON to the cost and kill the idea. if i could just build it the same as the 416 but with more cubes it will get done. not sure this motor will ever get pushed the way i think they believe it will. 95% street use and my car and my skills wont complete an autocross like kyle. i just cant see running a dry sump on the street. hell, the 4k cost would buy me a rebuild.