When we tore down our $400 LS1, we discovered some positive things and some negative things. We also discovered a horrible thing: The stock 853-code heads, which are regarded as some of the worst flowing to ever top an LS-based engine. We didn't quite know what our engine's destiny would be, but we…
5.3L heads can have LS1-sized valves installed in them, and have a slightly smaller combustion chamber that will give a compression boost.
Good to see this one's still moving forward albeit slowly. What years and models did the 799 heads appear in?
799 heads are from 2005 and newer 4.8 and 5.3-liter trucks.
FYI the front drive 5.3 engines have 243 heads
JB Weld for the win!
5.3 heads have been a well kept secret for a while. How do you think you get 400hp from a 5.3 with just a cam change and a carb? It is all about the stock heads on those being so good.
Been a minute, but aren't the rockers in 5.3 heads better than the LS1 parts?
I'm loving this project. But I have to say, I have always thought the reason motor-swappers pay up for an LS engine instead of a Ford was the turn-key package of HP and TQ. None of that fussing around required with SBF. This project is making me rethink that.
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