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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0001104659-05-038350.txt : 20050810
<SEC-HEADER>0001104659-05-038350.hdr.sgml : 20050810
<ACCEPTANCE-DATETIME>20050810172614
ACCESSION NUMBER:		0001104659-05-038350
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050809
FILED AS OF DATE:		20050810
DATE AS OF CHANGE:		20050810

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:		051014412

	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>
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    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-08-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000064472</issuerCik>
        <issuerName>GENCOR INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>GNCI.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
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            <rptOwnerCik>0000905215</rptOwnerCik>
            <rptOwnerName>HOUTKIN HARVEY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DOMESTIC SECURITIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>160 SUMMIT AVENUE</rptOwnerStreet2>
            <rptOwnerCity>MONTVALE</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07645</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
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    </reportingOwner>

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            <transactionDate>
                <value>2005-06-08</value>
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            <transactionTimeliness>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>500</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1154750</value>
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            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-06-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1155750</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2005-06-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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            <ownershipNature>
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            <securityTitle>
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            <transactionDate>
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            <transactionTimeliness>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>180</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.1</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1160995</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            </transactionDate>
            <transactionCoding>
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    <ownerSignature>
        <signatureName>S/Harvey Houtkin</signatureName>
        <signatureDate>2005-08-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----