Where can I find tuneup specs for 1970 402 (LS3)? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 06-06-2012, 11:11 PM

My rebuilt engine is on the dyno, and I'd like to find the original tuneup specs for the 1970 402 w/TH400. On the dyno they're having trouble getting it to idle below 900 (all stock) and I'm pretty sure the stock idle speed is much lower than that.

On the cars there was usually a sticker on the rad support with timing and mixture settings and the RPM in drive, etc. But my truck doesn't have it, and I cannot locate it in the owner's manual nor the service manual.

Can anyone point me to where I can find the "official" tuneup settings?

Thanks!
Dave

06-06-2012, 11:11 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Where can I find tuneup specs for 1970 402 (LS3)? My rebuilt engine is on the dyno, and I'd like to find the original tuneup specs for the 1970 402 w/TH400. On the dyno they're having trouble getting it to idle below 900 (all stock) and I'm pretty sure the stock idle speed is much lower than that. On the cars there was usually a sticker on the rad support with timing and mixture settings and the RPM in drive, etc. But my truck doesn't have it, and I cannot locate it in the owner's manual nor the service manual. Can anyone point me to where I can find the "official" tuneup settings? Thanks! Dave __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible



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