Pontiac V8 engine
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==Bore and stroke== | ==Bore and stroke== | ||
| − | <table border=" | + | <table border="2" cellpadding="2" cellspacing="0" > |
<tr align="center" bgcolor="#DDDFFF" valign="center"> | <tr align="center" bgcolor="#DDDFFF" valign="center"> | ||
<td>'''CID'''</td> | <td>'''CID'''</td> | ||
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===Original head applications=== | ===Original head applications=== | ||
| − | <table border=" | + | <table border="2" cellpadding="2" cellspacing="0"><tr><td colspan="5" align="center" bgcolor="#DDDFFF"><font size="4"><strong>CYLINDER HEAD APPLICATIONS</strong> </font></td></tr><tr><td bgcolor="#FFF8DC"><strong>Casting</strong></td><td bgcolor="#FFF8DC"><strong>Secondary ID</strong></td><td bgcolor="#FFF8DC"><strong>Valve diameter (in.)</strong></td><td bgcolor="#FFF8DC"><strong>Chamber volume</strong></td><td bgcolor="#FFF8DC"><strong>Original application</strong></td></tr><tr bgcolor="#F1F1F1"><td>4X</td><td>1/1H</td><td>2.11/1.66</td><td>112 cc</td><td>1973-'74 455ci 4-bbl</td></tr><tr><td>4X</td><td>3/3H</td><td>2.11/1.66</td><td>98-99 cc</td><td>1973-'74 400ci 4-bbl manual trans.</td></tr><tr bgcolor="#F1F1F1"><td>4X</td><td>4/4H</td><td>1.96/1.66</td><td>98-99 cc</td><td>1973-'74 400ci 2-bbl</td></tr><tr><td>4X</td><td>7/7H</td><td>2.11/1.66</td><td>98-99 cc</td><td>1973-'74 400ci 4-bbl auto trans.</td></tr><tr bgcolor="#F1F1F1"><td>4C</td><td>5/5H</td><td>1.96/1.66</td><td>96 cc</td><td>1973-'74 350ci 2-bbl w/A.I.R.</td></tr><tr><td>4C</td><td>8/8H</td><td>1.96/1.66</td><td>98 cc</td><td>1973-'74 400ci 2-bbl w/A.I.R.</td></tr><tr bgcolor="#F1F1F1"><td>46</td><td>6/6H'''*'''</td><td>1.96/1.66</td><td>96 cc</td><td>1973-'74 350ci</td></tr><tr><td>5C</td><td>4</td><td>2.11/1.66</td><td>92-94 cc</td><td>1975 350ci</td></tr><tr bgcolor="#F1F1F1"><td>5C</td><td>7</td><td>2.11/1.66</td><td>99-101 cc</td><td>1975 400ci w/A.I.R.</td></tr><tr><td>5C</td><td>8</td><td>2.11/1.66</td><td>99-101 cc</td><td>1975 400ci</td></tr><tr bgcolor="#F1F1F1"><td>5C</td><td>9</td><td>2.11/1.66</td><td>92-94 cc</td><td>1975 350ci w/A.I.R.</td></tr><tr><td>6X</td><td>4</td><td>2.11/1.66</td><td>92-94 cc</td><td>Mid 1975-'77 350ci; 1977-'79 W72 400ci</td></tr><tr bgcolor="#F1F1F1"><td>6X</td><td>8</td><td>2.11/1.66</td><td>99-101 cc</td><td>Mid 1975-'78 400ci</td></tr><tr><td>6S</td><td>7</td><td>2.11/1.66</td><td>99-101 cc</td><td>Mid 1975-'76 400ci w/A.I.R.</td></tr><tr bgcolor="#F1F1F1"><td>6S</td><td>9</td><td>2.11/1.66</td><td>92-94 cc</td><td>Mid 1975-'76 350ci w/A.I.R.</td></tr><tr><td>51</td><td>6</td><td>2.11/1.66</td><td>124.5 cc</td><td>1975 455ci</td></tr><tr bgcolor="#F1F1F1"><td>6H</td><td>6</td><td>2.11/1.66</td><td>124.5 cc</td><td>Late 1975-'76 455ci</td></tr><tr><td colspan="5">'''*'''Some reported to have a secondary stamp of "'''2'''"</td></tr></table> |
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*Best exhaust port: 1968 1/2 Ram Air II | *Best exhaust port: 1968 1/2 Ram Air II | ||
*Best D-port head: No.16, No.48, No.12 (tie) | *Best D-port head: No.16, No.48, No.12 (tie) | ||
| − | *Best low | + | *Best low compression D-port head: No.96(1971) |
| − | *Best low | + | *Best low compression post-1972 head: No. 6X |
*Best balanced head (exhaust to intake): 1963 421 SD | *Best balanced head (exhaust to intake): 1963 421 SD | ||
*Best low-lift (under .400) head: 1967 No.670 | *Best low-lift (under .400) head: 1967 No.670 | ||
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*Biggest disappointment: 1969-70 RA V, 1973-74 455 SD (tie) | *Biggest disappointment: 1969-70 RA V, 1973-74 455 SD (tie) | ||
*Biggest "sleeper": 1975 No. 5C | *Biggest "sleeper": 1975 No. 5C | ||
| − | *Most | + | *Most under-cammed: 1963 SD, 1971 455 HO, 1973-74 455 SD (tie) |
| − | *Most | + | *Most under-exhausted: 1964 GTO (No.9770716) |
*Most potential for porting: 1973-74 455 SD, 1968 1/2 RA II (tie) | *Most potential for porting: 1973-74 455 SD, 1968 1/2 RA II (tie) | ||
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Because the 1967 and newer valves don't line up correctly with the 1966-back piston valve reliefs in the pistons (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 engines. While these pistons will get the job done, from a high performance standpoint they are not desirable. | Because the 1967 and newer valves don't line up correctly with the 1966-back piston valve reliefs in the pistons (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 engines. While these pistons will get the job done, from a high performance standpoint they are not desirable. | ||
| − | Pontiac went to 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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[[File:PONTIAC CCW ROTATOIN ADVANCE WEIGHTS.jpg|thumb|300px|left|CCW orientation of mechanical advance weights and cam]] | [[File:PONTIAC CCW ROTATOIN ADVANCE WEIGHTS.jpg|thumb|300px|left|CCW orientation of mechanical advance weights and cam]] | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
| − | See [[Hot rodding the HEI distributor]]. | + | ;See [[Hot rodding the HEI distributor]]. |
==Timing covers== | ==Timing covers== | ||
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==Parts interchangeability== | ==Parts interchangeability== | ||
Based on info from teufert.net and Ken's Speed & Machine. | Based on info from teufert.net and Ken's Speed & Machine. | ||
| − | <table border=" | + | <table border="2" cellpadding="2" cellspacing="0"> |
<tr valign="center" align="middle"><td bgcolor="#DDDFFF"><font size="4"> <strong>PART:</strong></font></td> | <tr valign="center" align="middle"><td bgcolor="#DDDFFF"><font size="4"> <strong>PART:</strong></font></td> | ||
<td bgcolor="#DDDFFF"><font size="4"><strong>INTERCHANGE YEARS:</strong> </font></td></tr> | <td bgcolor="#DDDFFF"><font size="4"><strong>INTERCHANGE YEARS:</strong> </font></td></tr> | ||
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