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862 upgrade?

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Old 05-17-2018, 10:52 PM
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Default 862 upgrade?

So the plan was to do a 5.3 swap in my 67 camaro , all I was going to do was put a cam in and run it! Well I found water in a couple of cylinders, so I installed new flat top Pistons , a TSP 220r cam . I cannot find 243 or 799 heads and when I do they want big money right now! My question is it worth putting money into the 862 and having a 2 inch valve installed ? Or should I just run them ? Would I really gain that much ?
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Old 05-17-2018, 11:00 PM
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You should have NO trouble finding 243/799 heads as they come on nearly all Gen IV 5.3L truck engines, which are filling wrecking yards as we speak....
What year is the 5.3 you have?
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Old 05-17-2018, 11:10 PM
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Itís a 2003!
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Old 05-17-2018, 11:28 PM
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When you go into a wrecking yard, look for 2007-up trucks w/5.3 engines. Most if not all heads on those trucks are 799/243. They should not be that expensive, as common as they are.
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Old 05-18-2018, 03:56 AM
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Those 862's will perform very close to the 799/243 heads if they are completely worked over
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Old 05-18-2018, 09:07 AM
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There’s been testing done where the stock 862’s actually outperformed the 799/243 heads on a 5.3L.
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Old 05-18-2018, 12:34 PM
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Originally Posted by KCS View Post
Thereís been testing done where the stock 862ís actually outperformed the 799/243 heads on a 5.3L.
very true. And gearhead4life has a great DIY porting thread where he put LS1 2.00Ē intakes in plus milling and 4.8 flat tops to get 11.3:1 in the 5.3 engine
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Old 05-19-2018, 10:43 AM
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Look for Bobby Stipkovic of Steel City Auto in Pittsburgh. He has a set of 799/243 heads cleaned and assembled for about $500.
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Old 05-20-2018, 09:30 AM
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Keep the stock 862 heads, they are better than the 243s in what your doing.
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