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My 57 Chevy feels the need for NO speed.
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<blockquote data-quote="tRidiot" data-source="post: 3556802" data-attributes="member: 9374"><p>The problem with the 706 heads is most are made by Castech and there was a manufacturing defect which led to corrosion and coolant leakage into the heads. This is what got me in trouble with my 5.3L, it's been going on for several years.</p><p></p><p><a href="https://ww2-secure.justanswer.com/uploads/Bluegorilla/2008-12-05_142924_Coolant_loss_5.3.pdf" target="_blank">https://ww2-secure.justanswer.com/uploads/Bluegorilla/2008-12-05_142924_Coolant_loss_5.3.pdf</a></p><p></p><p>So that made up my mind - absolutely NO Castech heads. The 706 is the most common, but there are reports of the 862s also Castech manufactured having the same defect. There are SOME 706s out there NOT manufactured by Castech, but the only way to tell is to pull the valve cover and look for the casting mark. Most of the remanufactured engines I've found out there seem to come with 706 heads and even if the remanufacturer claims they've been inspected, reworked or 'repaired'... I don't want to run the risk of having to deal with this again.</p><p></p><p>Therefore, the 6.0 LQ9 and 317 heads is the route I decided to go. The flat pistons give it a slightly better compression ratio than the LQ4 and I'm just looking for longevity and reliability at this point. Mileage is a concern, HP is a distant dark horse for this one. I do run 3 alternators, so it'll be nice to have a little more power than my 5.3L L59 did - although I never felt it was 'anemic', I'm sure I'll notice the extra 40+ from the bigger motor. Aaaaand, this one won't have 275k on it, either, lol. The lift [USER=7248]@SlugSlinger[/USER] was so incredibly nice to help me do a couple years back ate into my mileage some more, so I'm just gonna cross my fingers, I guess. Having a 10MPG vacation vehicle for the family may hurt a little bit, but for me, getting away from even the remotest possibility of the Castech 706s was paramount.</p><p></p><p>Later I may upgrade the intake and exhaust, buy a tuner of my own and see about working with it a little bit to fine tune things - but I may just leave it pure stock, if it runs well and doesn't guzzle like Kid Rock on tour. <img src="/images/smilies/new/lmfao6.gif" class="smilie" loading="lazy" alt=":lmfao:" title="Lmfao6 :lmfao:" data-shortname=":lmfao:" /></p></blockquote><p></p>
[QUOTE="tRidiot, post: 3556802, member: 9374"] The problem with the 706 heads is most are made by Castech and there was a manufacturing defect which led to corrosion and coolant leakage into the heads. This is what got me in trouble with my 5.3L, it's been going on for several years. [URL]https://ww2-secure.justanswer.com/uploads/Bluegorilla/2008-12-05_142924_Coolant_loss_5.3.pdf[/URL] So that made up my mind - absolutely NO Castech heads. The 706 is the most common, but there are reports of the 862s also Castech manufactured having the same defect. There are SOME 706s out there NOT manufactured by Castech, but the only way to tell is to pull the valve cover and look for the casting mark. Most of the remanufactured engines I've found out there seem to come with 706 heads and even if the remanufacturer claims they've been inspected, reworked or 'repaired'... I don't want to run the risk of having to deal with this again. Therefore, the 6.0 LQ9 and 317 heads is the route I decided to go. The flat pistons give it a slightly better compression ratio than the LQ4 and I'm just looking for longevity and reliability at this point. Mileage is a concern, HP is a distant dark horse for this one. I do run 3 alternators, so it'll be nice to have a little more power than my 5.3L L59 did - although I never felt it was 'anemic', I'm sure I'll notice the extra 40+ from the bigger motor. Aaaaand, this one won't have 275k on it, either, lol. The lift [USER=7248]@SlugSlinger[/USER] was so incredibly nice to help me do a couple years back ate into my mileage some more, so I'm just gonna cross my fingers, I guess. Having a 10MPG vacation vehicle for the family may hurt a little bit, but for me, getting away from even the remotest possibility of the Castech 706s was paramount. Later I may upgrade the intake and exhaust, buy a tuner of my own and see about working with it a little bit to fine tune things - but I may just leave it pure stock, if it runs well and doesn't guzzle like Kid Rock on tour. :lmfao: [/QUOTE]
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