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Old 06-14-2014, 01:47 PM
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Efuel, which heads?

Some may remember my thread a few months ago when my 7.3 decided to let go. Well I'm finally getting somewhere. Long story short my block was shot so I found a $300 '02 used long block on craigslist that "had a knock". My hope was that it could be built relatively inexpensive. Well after tearing down I discovered that wasn't the case. It would need machining, a cyl sleeve pistons and I didn't want the pmr rods. So I found another complete "low mileage" 7.3 that was said to be pulled from a running '97 f-450. Just tore it down today because I couldn't just put it in my truck based on what some guy told me. It's in really good shape. I think I'll hone it put new bearings and rings in it and put it in. My question is which heads do I use? Obviously I will check for straightness but is there an advantage to using the sd heads over the obs since I'm doing efuel? I know the sd heads are a deadhead system and I'll be better off doing a reg return but didn't know if there was any reason to choose one versus the other. Btw I will be doing the 6.0 fuel pump efuel conversion.
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Old 06-14-2014, 02:33 PM
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As long as the OBS motor truly is a 97 the heads are exactly the same. The older 94.5/95 heads have 8 bolt intakes instead of 10 bolt and the heads are build a little heavier in 96+ years.

As for the fuel the heads are the same with plugs instead of fittings
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Old 06-14-2014, 02:41 PM
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I would use the heads that came with the engine.
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Old 06-14-2014, 09:01 PM
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Also the 99+ heads have 3" intake runners instead of the stock obs 2" style
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Old 06-16-2014, 06:01 AM
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I have the filter housing from the sd enginge. Should i use that as a post pump filter since i would assume it is designed to handle the full psi of the system? Or just go aftermarket with the housing.
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Old 06-16-2014, 05:39 PM
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Go aftermarket for better filtration and to get rid of everything in the valley
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Old 06-16-2014, 10:00 PM
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Can I ask why the opposition to a deadhead setup?

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Old 06-17-2014, 04:41 AM
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well just from my research it seems that a regulated return is an improvment. Figured while I was doing efuel i would do a rr setup too.
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Old 06-17-2014, 01:58 PM
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The regulated return provides more constant fuel pressure to the injectors with the surges in the rails due to injectors opening and closing
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