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Davidf · 04-20-2021, 09:37 AM

LS swap! dime a dozen 5.3L truck engine makes what 300hp (or close to it). My (not original) 350 fouls the #7 spark plug...all the excuse I needed to pull th trigger on a LS swap. Bought my neighbors '01 Tahoe for $600 (185k miles) and going through the engine now.

Good thing I decided to go through the engine as I found traces of coolant in the oil. Asked the neighbor and he said mystery coolant lose for past year. Good thing COVID caused him to work from home and rarely drove the truck since the issue began. Other than a bit of sludge (from coolant mixing with oil) the engine seems ok. Upon tear down, one of the head gaskets was leaking. Had the heads pressure checked, new stem seals, and surfaced. Should be good to go soon and then the fun starts!

But, if I was going to rebuild the 350 SBC, I would stroke it for sure.

04-20-2021, 09:37 AM	#23
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: Cracked 350 Crank, build 383? LS swap! dime a dozen 5.3L truck engine makes what 300hp (or close to it). My (not original) 350 fouls the #7 spark plug...all the excuse I needed to pull th trigger on a LS swap. Bought my neighbors '01 Tahoe for $600 (185k miles) and going through the engine now. Good thing I decided to go through the engine as I found traces of coolant in the oil. Asked the neighbor and he said mystery coolant lose for past year. Good thing COVID caused him to work from home and rarely drove the truck since the issue began. Other than a bit of sludge (from coolant mixing with oil) the engine seems ok. Upon tear down, one of the head gaskets was leaking. Had the heads pressure checked, new stem seals, and surfaced. Should be good to go soon and then the fun starts! But, if I was going to rebuild the 350 SBC, I would stroke it for sure.