Pontiac V8 engine
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(→Heads: Add table) |
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===4X heads=== | ===4X heads=== | ||
| − | <table border="1"><tr> | + | <table border="1"><tr bgcolor="#FFF8DC"> |
<td align="center"><strong>Application Stamp</strong></td> | <td align="center"><strong>Application Stamp</strong></td> | ||
<td align="center"><strong>Application</strong></td> | <td align="center"><strong>Application</strong></td> | ||
| Line 399: | Line 399: | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td colspan="4" align="center">*All rocker arms are threaded beginning with | + | <td colspan="4" align="center" tr bgcolor="#FFF8DC">*All rocker arms studs are threaded beginning with unit number 709986, assembled on or about May 7, 1973<br></td> |
</tr> | </tr> | ||
| − | </table> | + | </table><br> |
| + | ===Head ID code identifiers=== | ||
| + | <table border="1"> | ||
| + | ====1973-'74 4X, 46, 4C, 16/X==== | ||
| + | |||
| + | <tr bgcolor="#FFF8DC"> | ||
| + | <th align="center">Stamped ID</th> | ||
| + | <th align="center">Head # Code</th> | ||
| + | <th align="center">Chamber Volume<br>(cc)</th> | ||
| + | <th align="center">Valve Diameter<br>int./exh. (in.)</th> | ||
| + | <th align="center">Valve Length<br>(in.)</th> | ||
| + | <th align="center">CID</th> | ||
| + | |||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">1H / 1 </td><td align="center">4X </td><td align="center">112.30</td><td align="center">2.11/1.66</td><td align="center">4.78</td><td align="center">455 </td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">2H </td><td align="center">46</td><td align="center">96.17</td><td align="center">1.96/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">3H / 3</td><td align="center">4X</td><td align="center">98.21</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">4H / 4</td><td align="center">4X</td><td align="center">98.94</td><td align="center">1.96/1.66</td><td align="center">4.86</td><td align="center">350/400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">5H </td><td align="center">4C (AIR)</td><td align="center">96.17</td><td align="center">1.96/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">6H </td><td align="center">46</td><td align="center">96.17</td><td align="center">1.96/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">6H </td><td align="center">16/X</td><td align="center">110.74</td><td align="center">2.11/1.77</td><td align="center">4.97</td><td align="center">455 SD</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr><td align="center">7H </td><td align="center">4X</td><td align="center">98.21</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">8H / 8</td><td align="center">4C (AIR)</td><td align="center">98.94</td><td align="center">1.96/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td colspan="6" align="center" bgcolor="#FFF8DC">*All rocker arm studs are threaded beginning with unit number 709986, assembled on or about May 7, 1973<br></td> | ||
| + | </tr> | ||
| + | </table><br> | ||
| + | <table border="1"> | ||
| + | ====1975 (early) 5C, 51, 5I==== | ||
| + | <tr bgcolor="#FFF8DC"> | ||
| + | <th align="center">Stamped ID</th> | ||
| + | <th align="center">Head # Code</th> | ||
| + | <th align="center">Chamber Volume<br>(cc)</th> | ||
| + | <th align="center">Valve Diameter<br>int./exh. (in.)</th> | ||
| + | <th align="center">Valve Length<br>(in.)</th> | ||
| + | <th align="center">CID</th> | ||
| + | |||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 4</td><td align="center">5C</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">6 </td><td align="center">5C / 51</td><td align="center">124.51</td><td align="center">2.11/1.66</td><td align="center">4.71</td><td align="center">455</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">7 </td><td align="center">5C (AIR)</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 8</td><td align="center">5C</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 9</td><td align="center">5C (AIR)</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | </table><br> | ||
| + | <table border="1"> | ||
| + | ====1975-'79 6X, 6H==== | ||
| + | <tr bgcolor="#FFF8DC"> | ||
| + | <th align="center">Year</th> | ||
| + | <th align="center">Stamped ID</th> | ||
| + | <th align="center">Head # Code</th> | ||
| + | <th align="center">Chamber Volume<br>(cc)</th> | ||
| + | <th align="center">Valve Diameter<br>int./exh. (in.)</th> | ||
| + | <th align="center">Valve Length<br>(in.)</th> | ||
| + | <th align="center">CID</th> | ||
| + | |||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <th rowspan="6" bgcolor="#FFF8DC">1975-'76</th> | ||
| + | <td align="center"> 4</td><td align="center">6X</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">6 </td><td align="center">6X</td><td align="center">124.51</td><td align="center">2.11/1.66</td><td align="center">4.71</td><td align="center">455</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">6 </td><td align="center">6H</td><td align="center">124.51</td><td align="center">2.11/1.66</td><td align="center">4.71</td><td align="center">455</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center">7 </td><td align="center">6S (AIR)</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 8</td><td align="center">6X</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 9</td><td align="center">6S (AIR)</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">350</td> | ||
| + | </tr> | ||
| + | |||
| + | |||
| + | <tr> | ||
| + | <th rowspan="2" bgcolor="#FFF8DC">1977</th> | ||
| + | <td align="center"> 4</td><td align="center">6X</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">350 / 400 W72</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td align="center"> 8</td><td align="center">6X</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <th bgcolor="#FFF8DC">1978</th> | ||
| + | |||
| + | <td align="center"> 8</td><td align="center">6X</td><td align="center">100.04</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400</td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <th rowspan="2" bgcolor="#FFF8DC">1978-'79</th> | ||
| + | <td align="center"> 4</td><td align="center">6X</td><td align="center">93.74</td><td align="center">2.11/1.66</td><td align="center">4.86</td><td align="center">400 W72</td> | ||
| + | </tr> | ||
| + | </table><br> | ||
| + | |||
===Valve sizes=== | ===Valve sizes=== | ||
Often, modified Pontiac "X" heads have 1.77" exhaust valves installed in place if the stock 1.66" and this is obviously going to be very easy to determine. As far as the rest of the work that may have been done to the heads, you can visually look to see if they both have at least 3-angle seats (that won't tell you if the seats are concentric, though). The valves can be inspected to see that they have adequate margins, seat widths, and if they've been back cut or have undercut stems. I would suggest measuring the valve guide clearances, too. | Often, modified Pontiac "X" heads have 1.77" exhaust valves installed in place if the stock 1.66" and this is obviously going to be very easy to determine. As far as the rest of the work that may have been done to the heads, you can visually look to see if they both have at least 3-angle seats (that won't tell you if the seats are concentric, though). The valves can be inspected to see that they have adequate margins, seat widths, and if they've been back cut or have undercut stems. I would suggest measuring the valve guide clearances, too. | ||
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