Need opinion on complete BB value. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jeff M. · 03-27-2002, 11:14 PM

I've got a '71 402 from a 1/2 ton pickup. It has 8.5 : 1 compression ratio. I'm not sure about those heads as I've never had it apart. I know it sure ran good in my truck for 25 years or so. Had about 80,000 miles and still ran great. Just had to play with something different for a while, hehe. If that engine still has the stock bore it would be a good base for whatever you want to do with it. But I've seen lots of big blocks that have been punched out .030-.060. Good luck.

03-27-2002, 11:14 PM	#1
Jeff M. Registered User Join Date: Feb 2000 Location: Pixley, Ca. Posts: 486	I've got a '71 402 from a 1/2 ton pickup. It has 8.5 : 1 compression ratio. I'm not sure about those heads as I've never had it apart. I know it sure ran good in my truck for 25 years or so. Had about 80,000 miles and still ran great. Just had to play with something different for a while, hehe. If that engine still has the stock bore it would be a good base for whatever you want to do with it. But I've seen lots of big blocks that have been punched out .030-.060. Good luck. __________________ 69 C-10 CST Short Fleet, Factory Air, BB427-400 Auto-2400 stall-tilt-cruise-Tach & Vac Gagues, 4/6 drop, power one piece side windows, Eaton posi.



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