-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 BEgzb0saCvS/5cf3AHNmFLZnHU2LEnVoJTgp7IgQMrtDjxyKEj3BLCAoHXfJlMbH
 QGuKAIWf3DFnPyfFF2KS2g==

<SEC-DOCUMENT>0001104659-03-027834.txt : 20031204
<SEC-HEADER>0001104659-03-027834.hdr.sgml : 20031204
<ACCEPTANCE-DATETIME>20031204153049
ACCESSION NUMBER:		0001104659-03-027834
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030813
FILED AS OF DATE:		20031204

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GENCOR INDUSTRIES INC
		CENTRAL INDEX KEY:			0000064472
		STANDARD INDUSTRIAL CLASSIFICATION:	CONSTRUCTION MACHINERY & EQUIP [3531]
		IRS NUMBER:				590933147
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		5201 N ORANGE BLOSSOM TRAIL
		CITY:			ORLANDO
		STATE:			FL
		ZIP:			32810
		BUSINESS PHONE:		4072906000

	MAIL ADDRESS:	
		STREET 1:		5201 N ORANGE BLOSSOM
		CITY:			ORANLANDO
		STATE:			FL
		ZIP:			32810

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MECHTRON INTERNATIONAL CORP
		DATE OF NAME CHANGE:	19880128

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MECHTRON GENCO CORP
		DATE OF NAME CHANGE:	19720411

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MECHTRON CORP
		DATE OF NAME CHANGE:	19690909

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HOUTKIN HARVEY
		CENTRAL INDEX KEY:			0000905215

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11703
		FILM NUMBER:		031037825

	BUSINESS ADDRESS:	
		STREET 1:		160 SUMMIT AVE.
		CITY:			MONTVALE
		STATE:			NJ
		ZIP:			07645
		BUSINESS PHONE:		2017820888

	MAIL ADDRESS:	
		STREET 2:		160 SUMMIT AVE
		CITY:			MONTVALE
		STATE:			NJ
		ZIP:			07645
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-08-13</periodOfReport>
  <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000064472</issuerCik>
        <issuerName>GENCOR INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>GNCI</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000905215</rptOwnerCik>
            <rptOwnerName>HOUTKIN HARVEY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>160 SUMMIT AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MONTVALE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07645</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>0</isOfficer>
      <isTenPercentOwner>1</isTenPercentOwner>
      <isOther>0</isOther>
    </reportingOwnerRelationship>
  </reportingOwner>
  <nonDerivativeTable>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>852654</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>30000</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>As director and officer of Attain Technology, Inc.</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>537276</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>As director and officer of Domestic Securities, Inc.</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>43809</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>Owned by Mr. Houtkin's son, Stuart Houtkin</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
    <nonDerivativeHolding>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>467358</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>Owned by Mr. Houtkin's wife, Sherry Houtkin</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeHolding>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
      </securityTitle>
      <transactionDate>
        <value>2003-08-13</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>P</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>200000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>2.35</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>852654</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
        <footnoteId id="F1"/>
      </securityTitle>
      <transactionDate>
        <value>2003-08-13</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>P</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>200000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>2.35</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>30000</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>Attain Technology, Inc.</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
        <footnoteId id="F1"/>
      </securityTitle>
      <transactionDate>
        <value>2003-08-13</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>P</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>200000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>2.35</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>467358</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>By wife-Sherry Houtkin</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
        <footnoteId id="F1"/>
      </securityTitle>
      <transactionDate>
        <value>2003-08-13</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>P</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>200000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>2.35</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>45237</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>By Son-Stuart Houtkin</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
    <nonDerivativeTransaction>
      <securityTitle>
        <value>Class A Common Stock</value>
        <footnoteId id="F1"/>
      </securityTitle>
      <transactionDate>
        <value>2003-08-13</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>P</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>200000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>2.35</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>27289</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>I</value>
        </directOrIndirectOwnership>
        <natureOfOwnership>
          <value>By-Domestic Securities, Inc.</value>
        </natureOfOwnership>
      </ownershipNature>
    </nonDerivativeTransaction>
  </nonDerivativeTable>
  <footnotes>
    <footnote id="F1">Same transaction as above</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>/S/ Harvey Houtkin</signatureName>
    <signatureDate>2003-12-03</signatureDate>
  </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
