Pontiac V8 engine
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==Bore and stroke== | ==Bore and stroke== | ||
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<tr align="middle" valign="center" bgcolor="#FFF8DC"> | <tr align="middle" valign="center" bgcolor="#FFF8DC"> | ||
<td><font face="Arial">'''DISPLACEMENT''' (ci)</font></td> | <td><font face="Arial">'''DISPLACEMENT''' (ci)</font></td> | ||
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The combustion chamber volume can be changed by milling the head deck. One cc will be removed per 0.005" removed from the deck. All heads can be safely milled 0.050". The 1971 #96 and the 1972 #7K3 heads can be safely cut 0.070" and the 1971-'73 round port heads can be cut 0.085". If 0.030" or more is removed, the intake side of the head should be cut equally to keep the port and bolt holes in alignment. The chamber volume should be rechecked after a valve job; most times a valve job on the same size valve (not replacing a smaller valve with a larger valve) will add 2-4cc to the chamber volume. | The combustion chamber volume can be changed by milling the head deck. One cc will be removed per 0.005" removed from the deck. All heads can be safely milled 0.050". The 1971 #96 and the 1972 #7K3 heads can be safely cut 0.070" and the 1971-'73 round port heads can be cut 0.085". If 0.030" or more is removed, the intake side of the head should be cut equally to keep the port and bolt holes in alignment. The chamber volume should be rechecked after a valve job; most times a valve job on the same size valve (not replacing a smaller valve with a larger valve) will add 2-4cc to the chamber volume. | ||
| − | There were three sizes of combustion chambers on 6X heads. For most builds, the small chamber head is what is wanted. The late large chamber 455 heads on a 400 will put the compression ratio in the 7.8:1 range, even with a 0.040" quench. The small chambered 6X and similar head on a 0.030" over 455 with a 0.040" [ | + | There were three sizes of combustion chambers on 6X heads. For most builds, the small chamber head is what is wanted. The late large chamber 455 heads on a 400 will put the compression ratio in the 7.8:1 range, even with a 0.040" quench. The small chambered 6X and similar head on a 0.030" over 455 with a 0.040" [http://www.crankshaftcoalition.com/wiki/Quench '''quench'''] will result in a CR of about 9.75:1. On a 400 the CR will be around 9.2:1. |
*6X-4 and 6X-7: 93cc (have been seen to be as much as 95cc). The 6X-4 heads were found on mid '75-'77 350ci; 1977-'79 W72 400ci (TA "6.6 Litre" option) | *6X-4 and 6X-7: 93cc (have been seen to be as much as 95cc). The 6X-4 heads were found on mid '75-'77 350ci; 1977-'79 W72 400ci (TA "6.6 Litre" option) | ||
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Be aware that published figures often differ. The only sure way to know what the combustion chamber volume is, is to actually measure it. This will take everything into account: previous valve jobs, milling done to the decks, manufacturing and casting tolerance creep/stack up, etc. | Be aware that published figures often differ. The only sure way to know what the combustion chamber volume is, is to actually measure it. This will take everything into account: previous valve jobs, milling done to the decks, manufacturing and casting tolerance creep/stack up, etc. | ||
| − | + | <table border="1" cellspacing="1" cellpadding="1" style="border: 1px solid darkgray;" bgcolor="#FFF8DC"><tr><td colspan="5" align="center"><h3>Cylinder head applications</h3></td></tr><tr><td><strong>Casting</strong></td><td><strong>Secondary ID</strong></td><td><strong>Valve diameter (in.)</strong></td><td><strong>Chamber volume</strong></td><td><strong>Original application</strong></td></tr><tr><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><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><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><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><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><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><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><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><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 have been reported to have a secondary stamp of "2"</td></tr></table> | |
| − | <table border="1" cellspacing="1" cellpadding="1" bgcolor="#FFF8DC"><tr><td colspan="5" align="center">< | + | |
An alternative to using the larger chamber heads is to install dished pistons and use any of the smaller chambered performance heads. | An alternative to using the larger chamber heads is to install dished pistons and use any of the smaller chambered performance heads. | ||
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<table border="1"> | <table border="1"> | ||
<tr valign="center" align="middle"><td bgcolor="#FFF8DC"><font size="4"> <strong>PART:</strong></font></td> | <tr valign="center" align="middle"><td bgcolor="#FFF8DC"><font size="4"> <strong>PART:</strong></font></td> | ||
| − | <td bgcolor="#FFF8DC"><font size="4"><strong> | + | <td bgcolor="#FFF8DC"><font size="4"><strong>INTERCHANGE YEARS:</strong> </font></td></tr> |
<tr valign="center" align="middle"><td bgcolor="#FFF8DC"><strong>Block:</strong></td> | <tr valign="center" align="middle"><td bgcolor="#FFF8DC"><strong>Block:</strong></td> | ||
<td bgcolor="#FFF8DC">1955,1956,1957,1959-'60,1961-'64 (full size V8), 1964-'69 (Tempest/Grand Prix V8), 1970-'79.<br> '''Note:''' No block mount starter holes on pre-1964 blocks.</td></tr> | <td bgcolor="#FFF8DC">1955,1956,1957,1959-'60,1961-'64 (full size V8), 1964-'69 (Tempest/Grand Prix V8), 1970-'79.<br> '''Note:''' No block mount starter holes on pre-1964 blocks.</td></tr> | ||
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