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The Terminator
Engine/Tuning
tick/ new heads
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<blockquote data-quote="APTEN" data-source="post: 932379" data-attributes="member: 912"><p>porting can be helpful for 4V motors, but it's usually pretty expensive when you add disassembly and assembly of the heads.</p><p></p><p>We have a lot of test data showing that the coolant fix actually does work. It's more apparent when you do cars that are in the 600+ RWHP range. Over the years we have seen and read about a lot of problems with 7&8. The GT heads have different areas that run hotter, and we are working on a coolant fix for them. With time we will have more data that we can put in a format for people on the internet, but testing for stuff like this takes time. We do know at this point that the coolant modification has improved cylinder temperatures. We have shared this data with 4 different tuning companies and they have also shared testing and information back with us.</p><p></p><p>For the tick, the reason is they cast the exhaust port too close to the coolant passage on the early cylinder head. The exhaust port got the coolant hot and it caused the valve seats to warp, causing the tick. The only fix that is permanant is to get the better castings. </p><p></p><p>Brian</p></blockquote><p></p>
[QUOTE="APTEN, post: 932379, member: 912"] porting can be helpful for 4V motors, but it's usually pretty expensive when you add disassembly and assembly of the heads. We have a lot of test data showing that the coolant fix actually does work. It's more apparent when you do cars that are in the 600+ RWHP range. Over the years we have seen and read about a lot of problems with 7&8. The GT heads have different areas that run hotter, and we are working on a coolant fix for them. With time we will have more data that we can put in a format for people on the internet, but testing for stuff like this takes time. We do know at this point that the coolant modification has improved cylinder temperatures. We have shared this data with 4 different tuning companies and they have also shared testing and information back with us. For the tick, the reason is they cast the exhaust port too close to the coolant passage on the early cylinder head. The exhaust port got the coolant hot and it caused the valve seats to warp, causing the tick. The only fix that is permanant is to get the better castings. Brian [/QUOTE]
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