'70 350 CR, Gov Loc ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zac · 03-13-2010, 08:07 PM

Just bought a '70 burb, put regular gas in it like I used to with my '72 and it rattles. I noticed engine has an HEI with adjustable vacuum advance. Before I screw with that, does anyone know what the stock compression ratio would have been for the optional 350 4bbl, code 4LS9AD in 1970?

Glove box also says it has 4G80AF REAR POSITRACTION A. I think that's the infamous gov loc. I asked the PO about it and he said it was just a one wheel wonder as far as he knows. Is there an easy way to check if it still has the gov loc and if it is functional without popping the rear cover? The rearend doesn't make noise but I'm curious. Thanks

03-13-2010, 08:07 PM	#1
zac Registered User Join Date: Jul 2008 Location: louisville, ky Posts: 502	'70 350 CR, Gov Loc ID Just bought a '70 burb, put regular gas in it like I used to with my '72 and it rattles. I noticed engine has an HEI with adjustable vacuum advance. Before I screw with that, does anyone know what the stock compression ratio would have been for the optional 350 4bbl, code 4LS9AD in 1970? Glove box also says it has 4G80AF REAR POSITRACTION A. I think that's the infamous gov loc. I asked the PO about it and he said it was just a one wheel wonder as far as he knows. Is there an easy way to check if it still has the gov loc and if it is functional without popping the rear cover? The rearend doesn't make noise but I'm curious. Thanks

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