Pontiac V8 engine
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==Bore and stroke== | ==Bore and stroke== | ||
| − | <table border="1 | + | <table border="1"> |
<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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==="Low compression" heads=== | ==="Low compression" heads=== | ||
| − | 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. Obviously 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 | + | ===Original head applications=== |
| − | + | <table border="1" cellpadding="1" bgcolor="#FFF8DC"><tr><td colspan="5" align="center" bgcolor="#FFF8DC"><font size="4"><strong>CYLINDER HEAD APPLICATIONS</strong> </font></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> | |
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===Studs and guideplates=== | ===Studs and guideplates=== | ||
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===Rocker arms=== | ===Rocker arms=== | ||
| − | Most Pontiac engines came with 1.5:1 ratio rockers. Exceptions to this were the Ram Air IV engines, which used 1.65:1 rockers. The 1.65 rockers can be used on any Pontiac head but the push rod guide hole in the head has to be carefully inspected/enlongated at the top of the opening. More on | + | Most Pontiac engines came with 1.5:1 ratio rockers. Exceptions to this were the Ram Air IV engines, which used 1.65:1 rockers. The 1.65 rockers can be used on any Pontiac head but the push rod guide hole in the head has to be carefully inspected/enlongated at the top of the opening. More on rocker arm ratios, including cautions can be seen [http://www.pontiacstreetperformance.com/psp/RockerArms.html '''here''']. |
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===Valve springs=== | ===Valve springs=== | ||
| − | Cliff Ruggles has said "We use and prefer the Crower 68404 (1.6" installed height) or 68405 (1.7" installed height) for flat hydraulic cams with Pontiac cylinder heads." | + | Cliff Ruggles has said "We use and prefer the [http://www.summitracing.com/parts/CRO-68404-16/ Crower p/n 68404] (1.6" installed height) or [http://www.summitracing.com/parts/CRO-68405-16/ p/n 68405] (1.7" installed height) for flat hydraulic cams with Pontiac cylinder heads." |
===Round port heads=== | ===Round port heads=== | ||
[[File:D over rnd pont.jpg|thumb|500px|left|D-port #13 heads above a Ram Air IV head]] | [[File:D over rnd pont.jpg|thumb|500px|left|D-port #13 heads above a Ram Air IV head]] | ||
| − | Round port heads were long favored for high performance. But they | + | Round port heads were long favored for high performance. But they are scarce (read expensive), and don't flow all that well. |
Now that Edelbrock and others have come out with affordable aftermarket aluminum heads, the round port heads are all but ignored by the performance crowd. But to restorers, they are still highly sought after. | Now that Edelbrock and others have come out with affordable aftermarket aluminum heads, the round port heads are all but ignored by the performance crowd. But to restorers, they are still highly sought after. | ||
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