Pontiac V8 engine
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Terry Petty (Talk | contribs) m (→Pistons) |
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<td style="width: 60px">3.00</td> | <td style="width: 60px">3.00</td> | ||
<td style="width: 49px">3.00</td> | <td style="width: 49px">3.00</td> | ||
| − | <td style="width: 53px">2. | + | <td style="width: 53px">2.00</td></tr> |
<tr> | <tr> | ||
<td style="width: 81px">'''1980-'81'''</td> | <td style="width: 81px">'''1980-'81'''</td> | ||
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<td style="width: 60px">3.00</td> | <td style="width: 60px">3.00</td> | ||
<td style="width: 49px">3.00</td> | <td style="width: 49px">3.00</td> | ||
| − | <td style="width: 53px">2. | + | <td style="width: 53px">2.00</td></tr> |
</table> | </table> | ||
'''NOTES:'''<br> | '''NOTES:'''<br> | ||
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'''***'''The 350 engine actually displaced 354 ci. | '''***'''The 350 engine actually displaced 354 ci. | ||
<br> | <br> | ||
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==Pontiac engines by displacement== | ==Pontiac engines by displacement== | ||
<table class="style119" style="width: 620px" border="2" cellpadding="2" cellspacing="0"> | <table class="style119" style="width: 620px" border="2" cellpadding="2" cellspacing="0"> | ||
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<td style="width: 60px">3.00</td> | <td style="width: 60px">3.00</td> | ||
<td style="width: 46px">3.00</td> | <td style="width: 46px">3.00</td> | ||
| − | <td style="width: 26px">2. | + | <td style="width: 26px">2.00</td></tr> |
<tr bgcolor="#F1F1F1"> | <tr bgcolor="#F1F1F1"> | ||
<td style="width: 38px">'''287'''</td> | <td style="width: 38px">'''287'''</td> | ||
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<td style="width: 60px">3.00</td> | <td style="width: 60px">3.00</td> | ||
<td style="width: 46px">3.00</td> | <td style="width: 46px">3.00</td> | ||
| − | <td style="width: 26px">2. | + | <td style="width: 26px">2.00</td></tr> |
<tr bgcolor="#F1F1F1"> | <tr bgcolor="#F1F1F1"> | ||
<td style="width: 38px">'''303**'''</td> | <td style="width: 38px">'''303**'''</td> | ||
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<td >3.00</td> | <td >3.00</td> | ||
<td >3.00</td> | <td >3.00</td> | ||
| − | <td >2. | + | <td >2.00</td></tr> |
<tr bgcolor="#F1F1F1" align="center" valign="bottom"> | <tr bgcolor="#F1F1F1" align="center" valign="bottom"> | ||
<td>'''287'''</td> | <td>'''287'''</td> | ||
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<td >3.00</td> | <td >3.00</td> | ||
<td >3.00</td> | <td >3.00</td> | ||
| − | <td >2. | + | <td >2.00</td></tr> |
<tr bgcolor="#F1F1F1" align="center" valign="bottom"> | <tr bgcolor="#F1F1F1" align="center" valign="bottom"> | ||
<td>'''303**'''</td> | <td>'''303**'''</td> | ||
| − | <td >4. | + | <td >4.120</td> |
<td >2.840</td> | <td >2.840</td> | ||
| − | <td > | + | <td >2.50</td> |
<td >2.25</td></tr> | <td >2.25</td></tr> | ||
<tr align="center" valign="bottom"> | <tr align="center" valign="bottom"> | ||
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In 1967 the 400 4bbl engines went to new valve angle and placement and all Pontiac V-8's 1968 and newer. Newer valves don't line up correctly with the 67 2bbl, any 326 or all 1966-back piston valve reliefs (and obviously vice-versa), the correct piston has to be used if any sort of aftermarket high lift cam is used, or else there may be destructive valve to piston interference. There are 8-valve relief pistons available to fit all the valve angle differences used through the years on Pontiac 400 engines. While these pistons will get the job done, from a high performance standpoint they are not desirable partially due to the lower compression. | In 1967 the 400 4bbl engines went to new valve angle and placement and all Pontiac V-8's 1968 and newer. Newer valves don't line up correctly with the 67 2bbl, any 326 or all 1966-back piston valve reliefs (and obviously vice-versa), the correct piston has to be used if any sort of aftermarket high lift cam is used, or else there may be destructive valve to piston interference. There are 8-valve relief pistons available to fit all the valve angle differences used through the years on Pontiac 400 engines. While these pistons will get the job done, from a high performance standpoint they are not desirable partially due to the lower compression. | ||
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Pontiac went to an advertised 7.6:1 compression in about 1975, due in part to the design of the top of the pistons. Pontiac pistons from the low compression years have a 45 degree machined outer edge of the piston top. | Pontiac went to an advertised 7.6:1 compression in about 1975, due in part to the design of the top of the pistons. Pontiac pistons from the low compression years have a 45 degree machined outer edge of the piston top. | ||
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