The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Going to look at a Tahoe. High miles-should I worry

justcuz · 07-03-2012, 02:27 AM

Look up castech heads, then see if you have them. I replaced mine in my 2000 Suburban and it had 179,000 miles on it. It now has 218,000 miles on it, so putting new heads on an old engine story is baloney. Actually old race engine mechanics used to clean up the heads after an engine was broken in to pick up extra power frequently. Mine had original machining marks in the bores and no ridge. The pistons did not rock in the bores so I went for it. It has had about 40,000 miles put on it since the heads were done. These engines are pretty bulletproof, but be careful buying used engines, they may have the bad heads and the 4.8 and 5.3 use the same block, so you may end up with a 4.8 thinking you got a 5.3.

07-03-2012, 02:27 AM	#63
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: Going to look at a Tahoe. High miles-should I worry Look up castech heads, then see if you have them. I replaced mine in my 2000 Suburban and it had 179,000 miles on it. It now has 218,000 miles on it, so putting new heads on an old engine story is baloney. Actually old race engine mechanics used to clean up the heads after an engine was broken in to pick up extra power frequently. Mine had original machining marks in the bores and no ridge. The pistons did not rock in the bores so I went for it. It has had about 40,000 miles put on it since the heads were done. These engines are pretty bulletproof, but be careful buying used engines, they may have the bad heads and the 4.8 and 5.3 use the same block, so you may end up with a 4.8 thinking you got a 5.3.