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The Terminator
Engine/Tuning
PAC springs, anybody tried them?
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<blockquote data-quote="AirFlowEngineer" data-source="post: 11483237" data-attributes="member: 122828"><p>I used to work in a race shop in NC where I ported heads and intakes, performed valve jobs, and set up cylinder heads. The company I worked for manufactures all of PAC's retainers, spring locators, and spring cups. Jimmy is right, PAC springs are state of the art! That's why KB Racing, John Force Racing, RCR, and many other top teams use PAC. PAC is the performance/racing division of the Peterson Spring Corporation, who is most likely the largest manufacturer of spring products. Chances are the valve springs in your daily driven car were manufactured by the Peterson Spring Corporation. </p><p></p><p>I have installed PAC springs on many types of cylinder heads ranging from typical SBC to 5.0 inch bore space 800 inch Nitrous Pro Mod cylinder heads. As far as the fitment, on the springs that I have installed the retainer should fit snug. PAC typically makes it so that the ID of the spring on the retainer end should snap into the retainer, we're probably only talking about a .0005 clearance. This is unlike springs I have installed from Comp, where the retainer just lies in place on top of the spring. I'm guessing here, but I think the reason PAC makes the fit tighter than what people are traditionally use too is to help additionally stabilize the valve spring.</p><p></p><p>I don't have any personal experience with the 1223, but out of all the different PAC valve springs I've installed, they all have the same fit.</p></blockquote><p></p>
[QUOTE="AirFlowEngineer, post: 11483237, member: 122828"] I used to work in a race shop in NC where I ported heads and intakes, performed valve jobs, and set up cylinder heads. The company I worked for manufactures all of PAC's retainers, spring locators, and spring cups. Jimmy is right, PAC springs are state of the art! That's why KB Racing, John Force Racing, RCR, and many other top teams use PAC. PAC is the performance/racing division of the Peterson Spring Corporation, who is most likely the largest manufacturer of spring products. Chances are the valve springs in your daily driven car were manufactured by the Peterson Spring Corporation. I have installed PAC springs on many types of cylinder heads ranging from typical SBC to 5.0 inch bore space 800 inch Nitrous Pro Mod cylinder heads. As far as the fitment, on the springs that I have installed the retainer should fit snug. PAC typically makes it so that the ID of the spring on the retainer end should snap into the retainer, we're probably only talking about a .0005 clearance. This is unlike springs I have installed from Comp, where the retainer just lies in place on top of the spring. I'm guessing here, but I think the reason PAC makes the fit tighter than what people are traditionally use too is to help additionally stabilize the valve spring. I don't have any personal experience with the 1223, but out of all the different PAC valve springs I've installed, they all have the same fit. [/QUOTE]
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PAC springs, anybody tried them?
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