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Hey Dins, when you're all done with the V12 too, be sure to give a big fat middle finger to 'Smokey' Nagato's Supra with the same engine. Make sure you make it 1,000 HP supercharged to top his 950.
The LS1 driver's side head sets extra 1.5" further back and with my LS1 2-piece BH being 5.8" deep I still have another 2.5" I can set my engine back if I wanted to. That said the 1GZ heads are symetrical and the BH is 6.25" deep. Doing the math, this thing should distribute the weight similar to my LS swap which handles like a dream with all the front end weight gone. Dins will adapt a GM alternator and dump some LBS there too.