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SVTPerformance's Chain of Restaurants
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1991 Chevy Lumina Z34 | Retro Review
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<blockquote data-quote="xblitzkriegx" data-source="post: 16339050" data-attributes="member: 105608"><p>If the head gasket was routinely failing, I'd say that improper repairs were being made. I had one car that failed it's gasket and it was due to the radiator that let go in a spectacular fashion in winter. I've owned half a dozen Quad4 powered cars and they all routinely saw the Rev limiter along with summers in the South and only only failed. It was my LO/auto Calais that lost the radiator first. </p><p></p><p>Back then, a lot of mechanics weren't used to a dohc engine and didnt check the deck and surface the head. Most didnt bother to follow the torque sequence either. Also, the OEM victor-rienz gasket was subpar. A felpro replacement was the way to go. </p><p></p><p>Timing chain noise is due to the tensioners and they really only wore out due to improper maintenance. Worn out oil from long interval oil changes wear out the plastic and the plunger can only adjust so far. </p><p></p><p>The IDI definitely had flaws. Putting the ignitions system between the cam towers without adaquate ventilation was a mistake. They did fail a lot. The revised housing fixed most of the issues.</p><p></p><p>Cracked heads were very common with the sohc engine, not so much with the dohc unless you abused the engine. The sohc lacked material in important spots and cracked externally. It was a mess. The dohc did crack sometimes around the valve seats but it didn't cause any issues. Not that it was ok though. Most of those resulted from overheating as well. </p><p></p><p>The Quad4 was not an engine you could ignore. You had to stay on top of the maintenance and to be honest, it was more fragile than it should have been. </p><p></p><p>Regardless, it was a technologically sound engine that made great power before import engines came around. </p><p></p><p>Id still rather have a Quad4 over the 3.4 dohc from the era. Converting a ohv engine to dohc and using belts with 60k service life intervals sucks. Plus, changing the alt on that thing is something I wouldn't wish on an enemy.</p></blockquote><p></p>
[QUOTE="xblitzkriegx, post: 16339050, member: 105608"] If the head gasket was routinely failing, I'd say that improper repairs were being made. I had one car that failed it's gasket and it was due to the radiator that let go in a spectacular fashion in winter. I've owned half a dozen Quad4 powered cars and they all routinely saw the Rev limiter along with summers in the South and only only failed. It was my LO/auto Calais that lost the radiator first. Back then, a lot of mechanics weren't used to a dohc engine and didnt check the deck and surface the head. Most didnt bother to follow the torque sequence either. Also, the OEM victor-rienz gasket was subpar. A felpro replacement was the way to go. Timing chain noise is due to the tensioners and they really only wore out due to improper maintenance. Worn out oil from long interval oil changes wear out the plastic and the plunger can only adjust so far. The IDI definitely had flaws. Putting the ignitions system between the cam towers without adaquate ventilation was a mistake. They did fail a lot. The revised housing fixed most of the issues. Cracked heads were very common with the sohc engine, not so much with the dohc unless you abused the engine. The sohc lacked material in important spots and cracked externally. It was a mess. The dohc did crack sometimes around the valve seats but it didn't cause any issues. Not that it was ok though. Most of those resulted from overheating as well. The Quad4 was not an engine you could ignore. You had to stay on top of the maintenance and to be honest, it was more fragile than it should have been. Regardless, it was a technologically sound engine that made great power before import engines came around. Id still rather have a Quad4 over the 3.4 dohc from the era. Converting a ohv engine to dohc and using belts with 60k service life intervals sucks. Plus, changing the alt on that thing is something I wouldn't wish on an enemy. [/QUOTE]
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1991 Chevy Lumina Z34 | Retro Review
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