The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

raycow · 11-17-2010, 04:56 AM

Any 86 or later engine has a one-piece rear seal and takes a flywheel with the small bolt circle. This is a year thing and not a 305/350 difference. You can not tell the year from the STAMPED code. You must look at the casting date on the top rear of the block. As long as you have the heads off, all you have to do is measure the bore to see if you have a 305 or 350. The 350 was definitely an option in 86, so whoever told you otherwise told you wrong.

ay

11-17-2010, 04:56 AM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: 305 or 350 Any 86 or later engine has a one-piece rear seal and takes a flywheel with the small bolt circle. This is a year thing and not a 305/350 difference. You can not tell the year from the STAMPED code. You must look at the casting date on the top rear of the block. As long as you have the heads off, all you have to do is measure the bore to see if you have a 305 or 350. The 350 was definitely an option in 86, so whoever told you otherwise told you wrong. ay __________________ Live more responsibly. Eat lower on the food chain. Eat vegetarians.