454 + TH400 + 4.11 POSI = no freeway - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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454 + TH400 + 4.11 POSI = no freeway

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06-23-2017, 06:29 PM	#31
Hayden Buck Registered User Join Date: Jun 2017 Location: Davis ok Posts: 91	Re: 454 + TH400 + 4.11 POSI = no freeway I have a chevy 350 with a thr400 trans in it and run it at 7 with 100 percent octane and it seems to run great as long as I don't run less than 100 octane. It gets 16 mpg with the trans kit I have in it Posted via Mobile Device

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