Join Date: Mar 2012
SixPack is offline
Re: How much to rebuild a 4.3L v6 vortec?
My daughter purchase a 1991 S10 Blazer 4x4 new at a Chevrolet dealership in Bremerton WA. She gave it to me three years ago rather than trade it in on a new car. The S10 Blazer had 150,000 miles on it. She kept good care of the car and had it serviced regularly at the Chevrolet dealership.
The engine ran smooth and quiet and it was in excellent condition EXCEPT it had two bad intake valve seals on #2 and #3 cylinders. The dealership said was normal for a 4.3L V6 after 30K to 50K miles. Instead of replacing the lousy factory umbrella seals, I pulled the motor and had it bored and completely rebuilt. It was rebuilt with a new Comp Cams roller camshaft, 350 V8 forged pistons, and 1995 L35 heads. I have about $2500 in the engine, which includes about $800 invested in the heads that have Manley SS valves, roller rockers and beehive valve springs. Many would say "I could have had a V8" for the same price.
I have about 6,000 miles on the fresh engine and I am really surprised how well it runs. It was built by a local experienced racing engine builder who has built all kinds of racing engines including several 4.3L V6 Bowtie racing engines. He has built three Pontiac V8 engines for me since 1970.
I would have never purchased any Chevrolet S10 truck if I did not known it's history. Since my 1991 S10 Blazer 4x4 was a gift and I knew the engine, wheels, body and interior was in excellent condition, I had less to lose if the engine did not meet my expectations.
The spare tire on my 1991 S10 Blazer 4x4 has never been on the ground and it still has 1991 air in it.