Ford 144-250 inline 6 high performance building
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==Cams== | ==Cams== | ||
| − | Aftermarket cam grinds are available from Clay Smith, Comp Cams, Isky and Schneider. Be aware that some of the cams offered exceed the lift capability of stock valve springs, which is about 0.450". They also may exceed the lift rate | + | Aftermarket cam grinds are available from Clay Smith, Comp Cams, Isky and Schneider. Be aware that some of the cams offered exceed the lift capability of stock valve springs, which is about 0.450". They also may exceed the lift rate at the maximum RPM. However, the good news is that there are a few aftermarket spring options. |
| − | Clay Smith offers a couple of options, but they may require machining the head for PC valve seals. Another option is Ford 302 intake springs, which will allow just over 0.500" lift and will provide sufficient pressure to prevent | + | Clay Smith offers a couple of options, but they may require machining the head for PC valve seals. Another option is Ford 302 intake springs, which will allow just over 0.500" lift and will provide sufficient pressure to prevent valve float at high RPM. These are single springs, which allow the use of stock valve seals. However, the valve retainers for these springs were designed for 11/32" diameter valve stems. In order to use them with 144-250ci valves, which have 5/16" diameter stems, it is necessary to mix the 302 V8 retainer parts and the 6 cylinder retainer parts. |
Both of the 144-250ci and 302ci retainers have four parts: | Both of the 144-250ci and 302ci retainers have four parts: | ||
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