Just double checked, you are right; for some reason I thought that the turbine wheel was already bigger in the HE351. You don't think the bigger housing will help at all? I would rather add an external wastegate and keep the quicker spool up than go to such a bigger turbine and it be a dog on the low end.
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49 Willys Pickup. 5600lb. 11.8sec @115mph 1/4. 12 valve. MegaSquirted 47RH. 3.54 posi rear. 35" tires. 64mm HE351ve, S475 (75/96/1.32), A/W Intercooler. AFC mods. 5x16s. 191 DVs, 180 pump. 23*. 85psi. Build Thread
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