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Eldon, Missouri 65026

 

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Marvel Carburetor adjustments

DIMENSIONS All dimensions are in thousandths of an inch

CARBURETOR NUMBER This is the carburetor identification number (I did not list the prefix 10 normally associated with Marvel numbers. Thus the first entry 524 should be read as 10-524).

FLOAT ADJUSTMENTS

Type 1 updraft carburetor measure from top of float when closed to top of bowl casting with fuel valve closed.

Type 2 updraft carburetor measure from BOTTOM of float when closed to bowl casting with fuel valve closed.

Type 3 downdraft carburetor measure from BOTTOM of float to top of lower casting with fuel valve closed.

AIRVALVE CLEARANCE

Measure the clearance from the bottom of airvalve to the spacer block with the top of the airvalve seated against the throttle body. Due to warpage (expansion) of the spacer block, normally one will need to machine the spacer block to obtain this dimension.

CAVIAT The dimensions given below represent the LATEST information in my possession. These dimensions, ESPECIALLY float height, may not agree with information in a factory car service manual. Marvel seemed to change the float dimension with the change of the moon! This list is not a complete list of Marvel carburetors; but it is what I have.

 

Carburetor number Float height Type Airvalve clearance range

524 0.625 1 0.009 0.017

544 0.625 1 0.009 0.017

587 0.625 1 0.008 0.013

 

592 0.625 1 0.009 0.017

610 0.625 1 0.008 0.013

611 0.625 1 0.006 0.010

 

617 0.5625 1 0.009 0.017

621 0.5625 1 0.008 0.013

633 0.625 1 0.008 0.013

 

637 0.34375 1 0.006 0.010

639 0.34375 1 0.006 0.010

642 0.5625 1 0.009 0.017

 

658 0.625 1 0.009 0.017

659 0.34375 1 0.009 0.017

661 0.5625 1 0.006 0.010

 

663 0.625 1 0.006 0.010

669 0.5625 1 0.006 0.010

671 0.34375 1 0.006 0.010

 

672 0.5625 1 0.009 0.017

673 0.625 1 0.008 0.013

676 0.625 1 0.008 0.013

 

677 0.625 1 0.008 0.013

686 0.297 1 0.008 0.013

688 0.297 1 0.006 0.010

 

690 0.297 1 0.006 0.010

693 0.297 1 0.008 0.013

695 0.297 1 0.008 0.013

 

696 0.297 1 0.008 0.014

697 0.297 1 0.006 0.010

705 0.297 1 0.020 0.024

 

707 0.297 1 0.020 0.024

708 0.34375 1 0.010 0.014

712 0.297 1 0.008 0.012

 

714 0.297 1 0.008 0.012

716 0.297 1 0.020 0.024

718 0.297 1 0.020 0.024

 

719 0.296875 1 0.020 0.024

721 0.34375 1 0.010 0.014

723 0.34375 1 0.010 0.014

 

725 0.297 1 0.020 0.024

733 0.3125 1 0.008 0.012

739 0.297 1 0.008 0.012

 

740 0.296875 1 0.008 0.012

748 0.297 1 0.020 0.024

750 0.297 1 0.020 0.024

 

752 0.34375 1 0.009 0.017

753 0.297 1 0.020 0.024

756 0.297 1 0.020 0.024

 

759 0.297 1 0.020 0.024

761 0.296875 1 0.020 0.024

764 0.297 1 0.020 0.024

 

770 0.297 1 0.020 0.024

773 0.297 1 0.008 0.014

775 0.46875 1 0.008 0.013

 

777 0.297 1 0.010 0.014

779 0.3125 1 0.010 0.014

780 0.3125 1 0.010 0.014

 

781 0.34375 1 0.010 0.014

783 0.296875 1 0.010 0.014

795 0.297 1 0.018 0.022

 

796 0.297 1 0.018 0.022

894 0.297 1 0.018 0.022

940 0.46875 1 0.008 0.013

 

941 0.46875 1 0.008 0.013

943 0.296875 1 0.020 0.024

946 0.34375 1 0.007 0.011

 

947 0.34375 1 0.007 0.011

949 0.296875 1 0.010 0.014

950 0.297 1 0.010 0.014

 

952 0.46875 1 0.008 0.013

955 0.34375 1 0.008 0.012

982 0.297 1 0.008 0.012

 

983 0.297 1 0.018 0.022

984 0.297 1 0.018 0.022

989 0.297 1 0.010 0.014

 

992 0.297 1 0.010 0.014

993 0.46875 1 0.008 0.013

 

995 0.34375 1 0.007 0.011

1501 0.297 1 0.018 0.022

1503 0.297 1 0.018 0.022

 

1505 0.34375 1 0.007 0.011

1506 0.34375 1 0.007 0.011

1508 0.34375 1 0.01 0.014

 

1511 0.34375 1 0.007 0.011

1514 1.1875 2 0.018 0.022

1515 1.1875 2 0.008 0.012

 

1518 1.1875 2 0.018 0.022

1530 0.34375 1 0.016 0.020

1531 0.34375 0

 

1534 0.297 1 0.010 0.014

1545 1.42875 3

1549 1.42875 3

 

1577 1.21875 2 0.008 0.012

1579 1.21875 2 0.008 0.012

1581 1.21875 2 0.008 0.012

 

1603 1.40625 3

1621 0.34375 1 0.016 0.020

1633 0.40625 1

 

1653 0.40625 3

1673 1.375 3

1678 1.375 3

 

1680 1.5 3

1690 1.375 3

1690 1.375 3

 

1691 1.375 3

1691 1.375 3

1692 1.5 3

 

1744 1.5 3

1749 0.40625 3

1750 0.40625 3

 

1751 0.40625 3

1752 0.40625 3

1762 0.25 3

 

1763 0.25 3

1765 1.375 3

1796 0.1875 3

 

1797 0.1875 3

1798 0.25 3

1799 0.25 3

 

1802 0.59375 3

1808 0.59375 3

1809 0.59375 3