Vortec L31 cylinder head

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(→Flow rate of L31 Vortec heads)
(→Vortec intake manifolds)
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<table border="5" cellspacing="0" cellpadding="5"><tr valign="top" tr bgcolor="#CCCCFF"><td colspan="2"><center>'''INTAKE'''</center></td><td colspan="2"><center>'''EXHAUST'''</center></td></tr><tr valign="top" tr bgcolor="#FFF8DC"><td>'''Lift''' (in.)</td><td>&nbsp;'''CFM'''&nbsp;</td><td>'''Lift''' (in.)</td><td>&nbsp;'''CFM'''&nbsp;</td></tr><tr valign="top"><td>0.200</td><td>128.6</td><td>0.200</td><td>100.8</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.300</td><td>188.4</td><td>0.300</td><td>138.6</td></tr><tr valign="top"><td>0.400</td><td>234.8</td><td>0.400</td><td>154.4</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.500</td><td>257.2</td><td>0.500</td><td>152.5</td></tr><tr valign="top"><td>0.600</td><td>263.2</td><td>0.600</td><td>163.8</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.700</td><td>269.1</td><td>0.700</td><td>167.0</td></tr></table>
 
<table border="5" cellspacing="0" cellpadding="5"><tr valign="top" tr bgcolor="#CCCCFF"><td colspan="2"><center>'''INTAKE'''</center></td><td colspan="2"><center>'''EXHAUST'''</center></td></tr><tr valign="top" tr bgcolor="#FFF8DC"><td>'''Lift''' (in.)</td><td>&nbsp;'''CFM'''&nbsp;</td><td>'''Lift''' (in.)</td><td>&nbsp;'''CFM'''&nbsp;</td></tr><tr valign="top"><td>0.200</td><td>128.6</td><td>0.200</td><td>100.8</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.300</td><td>188.4</td><td>0.300</td><td>138.6</td></tr><tr valign="top"><td>0.400</td><td>234.8</td><td>0.400</td><td>154.4</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.500</td><td>257.2</td><td>0.500</td><td>152.5</td></tr><tr valign="top"><td>0.600</td><td>263.2</td><td>0.600</td><td>163.8</td></tr><tr bgcolor="#F1F1F1" valign="top"><td>0.700</td><td>269.1</td><td>0.700</td><td>167.0</td></tr></table>
  
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==Vortec intake manifolds==
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Hello,
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The L30 5.0L and L31 5.7L Vortec engines never came with a carb; they all used EFI so did not need a heat crossover port in the heads. GMPP and the aftermarket sell various carburetor and TBI intakes to fit the Vortec heads, so using a carb or TBI with Vortec heads is easy. Some GMPP Vortec intakes have the provision to run coolant through the plenum area to provide intake heat.
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===Using an early style intake on an aftermarket Vortec-type head===
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Please send us the price quote for the item listed below:
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Vortec heads (also applicable to the 4.3L 90 degree V6) use an intake manifold having 8 instead of 12 bolts. Also, Vortec intake ports are taller than earlier SBC heads; there's not enough metal above the port (except on "raised port" aftermarket intakes) to allow the head and intake port to match up. That means earlier 12 bolt intakes will not match up to the Vortec bolt pattern or ports.
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Many aftermarket Vortec style heads (including Bow Tie Vortec heads) feature dual bolt patterns allowing the use of the early 12-bolt intakes. This has a very limited use.
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Bosch (7305) MR3DII360 Industrial Spark Plug -------------------186 pieces
  
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Commonly available 12 bolt SBC dual plane intakes do not have enough metal above the port to be ported to match the Vortec port, w/o having a vacuum leak or razor thin sealing surfaces above the ports. An early intake would need at least 0.325" of material above the intake port opening to have any chance of sealing, and that doesn't take the difference in the port width/location into account. Because of the height of the Vortec intake port, only the single plane 'raised port' race intakes have enough height to actually match up to the Vortec head intake port- but even then the ports may be too wide or have other fitment issues.
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Your urgent response will be highly appreciated
  
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Because of these differences, a Vortec-specific intake should be used.
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Thank You!
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;Chevrolet says<nowiki>:</nowiki>
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<blockquote>
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Quotation must be submitted on or before 7/30/2019 .Quotes after due date may not be accepted.
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Do not try to modify either the heads or the intake manifold to try to make the Vortec heads match up to a standard 12-bolt intake manifold. The ports will not match up. You must use a Vortec style intake manifold with any Vortec style cylinder head.
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</blockquote>
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Marking of Quotations: Quotations submitted via email should be marked in the
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;Return to '''[[Vortec_L31_cylinder_head#Upgrading and compatibility|''Upgrading and compatibility'']]'''
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subject of email and Quotations as follows: “Company’s name, CH/7/2019 - SDE”.
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Quotations submitted by email must be limited to a maximum of 9 MB, virus-free and no more than two email
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transmissions. They must be free from any form of virus or corrupted contents, or the quotations shall be rejected.
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Quotations that are received after the deadline indicated above, for whatever reason, shall not
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be considered for evaluation. If you are submitting your quotation by email, kindly ensure that they are in the .PDF format, and free from any virus or corrupted files
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Sarah O'connor
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Purchasing Manager
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Illinois Department of Agriculture
  
 
==Intake gaskets==
 
==Intake gaskets==

Revision as of 05:37, 12 July 2019

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