Pontiac V8 engine

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Line 97: Line 97:
 
<td style="width: 81px">'''1969'''</td>
 
<td style="width: 81px">'''1969'''</td>
 
<td style="width: 48px">303'''**'''</td>
 
<td style="width: 48px">303'''**'''</td>
−
<td style="width: 54px">4.125</td>
+
<td style="width: 54px">4.120</td>
 
<td style="width: 60px">2.84</td>
 
<td style="width: 60px">2.84</td>
−
<td style="width: 49px">3.00</td>
+
<td style="width: 49px">2.50</td>
 
<td style="width: 53px">2.25</td></tr>
 
<td style="width: 53px">2.25</td></tr>
 
<tr bgcolor="#F1F1F1">
 
<tr bgcolor="#F1F1F1">
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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">2.25</td></tr>
+
<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">2.25</td></tr>
+
<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>
 +
 
==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">2.25</td></tr>
+
<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">2.25</td></tr>
+
<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>
 
<td style="width: 62px">1969</td>
 
<td style="width: 62px">1969</td>
−
<td>4.125</td>
+
<td>4.120</td>
 
<td style="width: 60px">2.84</td>
 
<td style="width: 60px">2.84</td>
−
<td style="width: 46px">3.00</td>
+
<td style="width: 46px">2.50</td>
 
<td style="width: 26px">2.25</td></tr>
 
<td style="width: 26px">2.25</td></tr>
 
<tr>
 
<tr>
Line 288: Line 289:
 
     <td >3.00</td>
 
     <td >3.00</td>
 
     <td >3.00</td>
 
     <td >3.00</td>
−
     <td >2.25</td></tr>
+
     <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>
Line 300: Line 301:
 
     <td >3.00</td>
 
     <td >3.00</td>
 
     <td >3.00</td>
 
     <td >3.00</td>
−
     <td >2.25</td></tr>
+
     <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 >4.125</td>
+
     <td >4.120</td>
 
     <td >2.840</td>
 
     <td >2.840</td>
−
     <td >3.00</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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A dual pattern cam like Comp Cams' XE series or a Lunati Voodoo would be good cams to look into. For info on Comp Cams XE series of cams you can contact Butler Performance for good solid info. For info on Crower cams contact Kauffman Racing Engines or Spotts Performance. These shops can be contacted via phone or email.
 
A dual pattern cam like Comp Cams' XE series or a Lunati Voodoo would be good cams to look into. For info on Comp Cams XE series of cams you can contact Butler Performance for good solid info. For info on Crower cams contact Kauffman Racing Engines or Spotts Performance. These shops can be contacted via phone or email.
 +
 +
List of camshafts: http://www.pontiacpower.org/PontiacCams.htm
 +
 
;[[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]]
 
;[[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]]
  
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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.
−
 
−
You must use the 8 valve relief pistons if you bore out your 67 400 2bbl engine if you use the 67 400 2bbl heads, but you will gain around around 15 cc of piston dish displacement due to the extra valve reliefs, lower compression height and the crown cut on the edges of the piston.  However, if the standard 400 bore is not more than .003" worn, you can hone them and install .060" over-sized 65-66 389 pistons and .060" 389 rings.  They will have the correct valve reliefs for the 2bbl engine, a true flat-top and you will retain close to stock compression.  67 400 2bbl engines were offered in 8.6 or 10.5:1 compression ratios (different cylinder heads) so the 8 valve relief pistons may work better if need to lower compression on a 10.5:1 engine down to around 8.5:1 give or take depending on deck, head gasket, etc.
 
  
 
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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The same timing chain cover was used for both '64 and '65 and had just a simple pointer. These were cast with number '''9773371'''. The timing cover used on '66 and '67 employed a small timing scale marked -4-0-+6 and is otherwise identified as casting #'''9783130'''. The '68, '69 and '70 timing covers look very similar with timing marks of 0-6-12 degrees BTDC and accommodated the large diameter damper. The '68 timing cover casting number is '''9790347''' and uses the 8-bolt water pump. The '69-'70 timing cover casting number is '''9796346''' and uses the improved 11-bolt pump. For '71-up the timing cover timing tab is marked from 4 degrees ATDC to 12 degrees BTDC and is graduated all the way to 16 degrees BTDC. As compression ratios were lowered to 8:1 and less there became a need for increased initial advance. Casting number for this cover is '''482883'''. If you need to order a water pump the Federal Mogul part numbers are: '64-'68 is FP1388N, early '69 is FP1409N and late '69-on is FP1423.   
 
The same timing chain cover was used for both '64 and '65 and had just a simple pointer. These were cast with number '''9773371'''. The timing cover used on '66 and '67 employed a small timing scale marked -4-0-+6 and is otherwise identified as casting #'''9783130'''. The '68, '69 and '70 timing covers look very similar with timing marks of 0-6-12 degrees BTDC and accommodated the large diameter damper. The '68 timing cover casting number is '''9790347''' and uses the 8-bolt water pump. The '69-'70 timing cover casting number is '''9796346''' and uses the improved 11-bolt pump. For '71-up the timing cover timing tab is marked from 4 degrees ATDC to 12 degrees BTDC and is graduated all the way to 16 degrees BTDC. As compression ratios were lowered to 8:1 and less there became a need for increased initial advance. Casting number for this cover is '''482883'''. If you need to order a water pump the Federal Mogul part numbers are: '64-'68 is FP1388N, early '69 is FP1409N and late '69-on is FP1423.   
 
</blockquote>
 
</blockquote>
 +
 +
Pontiac Timing Cover Indentification (and Parts) from Butler Performance:
 +
http://butlerperformance.com/n-13416-pontiac-timing-cover-identification.html
 +
 
;[[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]]
 
;[[Pontiac V8 engine #Parts interchangeability|Return to Parts interchangeability]]
  
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===Water pump===
 
===Water pump===
 
There were two basic water pump designs used between 1964 and the end of production: an 8-bolt (up to '68-early '69) and an 11-bolt pump used after the 8-bolt pump.
 
There were two basic water pump designs used between 1964 and the end of production: an 8-bolt (up to '68-early '69) and an 11-bolt pump used after the 8-bolt pump.
 +
1969-1976 with Timing Pointer, 1977-up without Timing Pointer.
 +
 +
1955-1963: 4-bolt water pump
  
 
If the engine seems to be overheating, first be sure the temp gauge is reading correctly. Use a temporary mechanical gauge to check it. Then check the ignition timing to be sure it's not retarded.
 
If the engine seems to be overheating, first be sure the temp gauge is reading correctly. Use a temporary mechanical gauge to check it. Then check the ignition timing to be sure it's not retarded.
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*[http://www.highperformancepontiac.com/techarticles/index.html Various tech articles], from High Performance Pontiac
 
*[http://www.highperformancepontiac.com/techarticles/index.html Various tech articles], from High Performance Pontiac
 
*[http://www.jalopyjournal.com/forum/showthread.php?t=316668 Pontiac Hemi] HAMB thread
 
*[http://www.jalopyjournal.com/forum/showthread.php?t=316668 Pontiac Hemi] HAMB thread
 +
*Passenger-Side-Only Lifter Clatter (HotRod Magazine): http://butlerperformance.com/files/images/oil-galley-plug.jpg
  
 
[[File:7K3 Pont HEADS DRILLED FOR HEADERS 2.jpg|thumb|300px|left|7K3 heads drilled for headers. [http://www.spottsperformance.com/ Spots Performance] also sells "L" brackets for heads like these that don't have the pad.]]
 
[[File:7K3 Pont HEADS DRILLED FOR HEADERS 2.jpg|thumb|300px|left|7K3 heads drilled for headers. [http://www.spottsperformance.com/ Spots Performance] also sells "L" brackets for heads like these that don't have the pad.]]

Latest revision as of 17:30, 27 September 2022

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