Reproduction Parts For Sale
We have reproduced some of the parts needed to restore Quicksilver racing lower units. We hope to be able to furnish enough parts to be able to totally restore your unit. Following is a listing of the parts we have made or are in the process of manufacturing. These parts are built just like factory original parts. The aluminium parts are made from 6061T6 grade stock.
These parts are for the Mercury Mark 20H, Mark 30H and Mark 55H. The A/B parts will also work on the Mercury KG4H, KG7H, KG4Q and the KG7Q.
To order parts email, call or mail a request to the information listed on our Contact page. Most shipping will cost around $5.50 for the first item and one dollar for each additional item ordered.
All purchases delivered or picked up in Florida are subject to a sales tax of 6.5%.
D Driveshafts for the Mercury Mark 55H or Mod engines.
There are three versions available, the standard Mark 55H, a second in the standard length with five (5) inches of crankshaft splines and the third that is two (2) inches longer which can be cut down to any length for use with a coupler. The standard length with the longer splines can be cut off up to four (4) inches so a coupler does not have to be used for a shorter shaft length. All of the shafts are made like the originals including heat treating and hardening in the bearing area.
Prices Standard length $295.00
Longer length $225.00
Standard with longer splines $295.00
Shipping to USA addresses including insurance is $25.00
Mark 30H and Mark 20H Driveshafts
Made from Mercury plans and checked against an NOS C shaft. These are the standard Mark 30H shaft and the Mark 20H shaft that uses the Mark 30H bottom end and the 16 mm 6202/16 bearing. This shaft has been called the Metric shaft due to the use of this larger bearing. Also available is a cut down version of the C shaft for use on a Mod unit. You just have to make a coupling on the top and you are set to go.
Price Mark 30H $275.00
Mark 20H $275.00
Stub $175.00
Shipping to USA addresses including insurance is $25.00
Mercury Recoil Rope, KG4, KG7 and Mark 20
Recoil rope, Original style cloth wrapped with galvanized steel core wire. Dyed wine color like original.
5.5' with metal anchor pin $15.00
This is an exact reporduction of the cone nut used on the KG4Q and KG7Q racing lower unit. An Oillite bushing has been installed that will fit the OEM propshaft.
21875A1 A/B Bushed cone nut $45.00

A-20902 A/B/C Propshaft Cone Nut $35.00
A-21590 D Propshaft Cone Nut $40.00
We can polish any cone nut we sell for $5.00 additional cost.
46-20905 A/B/C Water Pump Cover (Bearing Carrier) $30.00
46-21587 D Water Pump Cover (Bearing Carrier) $35.00
(shown with seals and bearings installed for an additional charge)
Seals & Bearings for either Carrier installed additional $80.00
46-21892 D Water Pump Cartridge $65.00
Seal installed in cartridge for an additional $ 9.50
Water Pump "L" Ring used behind the cartridge
12-21890 D Water Pump L Ring $ 11.00
Gaskets
Mark 20H Conversion Specific Gasket Set
27-29508, 27-29509, 27-29502, 27-29504 $20.00
27-20531 Mark 20H, KG7H & KG4H Cyl. Block CoverGasket $4.50
Non conversion 20H
27-20536 Mark 20H, KG7H & KG4H Block to Manifold Gasket $ 6.00
Block to Crankcase
27-21173 KG4-7,KE7,KF7,KH7,MK 15, 20 Gasket, $ 4.75
27-20030 KG4H, KG7H, MK 20H, MK 30H, MK 55H
Single $1.75 Two $3.00 Four $5.00 
27-20478 MK 20H and MK 55H
Carb to Crankcase for both Carter N or KA7A $ 3.75
27-20501 MK 20H and MK 25
Lower Bearing End Cap (Thin) $3.75
27-20538 K Series engines, MK 20H,(Non Conv.) MK 15, MK 25
Exhaust Cover to Baffle $ 7.00
27-20642 MK 20H and MK 25
Powerhead to Lower Unit Mid Section $ 5.00
27-21173 MK 20H and MK 25
Crankcase to Engine Block $ 4.75
27-21613 1939 to 1953 K Series engines
Powerhead to Lower Unit Mid Section $ 6.00
Mark 20H Original Gasket Set:
27-20478, 27-20501, 27-21713, 27-20030 (2), 27-20538, 27-20536, 27-20531, 27-20642, 27-20039
Price $40.00
This set can be used for a KG 4 or KG 7 by eliminating 27-20478 & 27-20039 Price $33.00
Mark 20H Conversion Gasket Set:
Includes 27-20478, 27-20501, 27-21713, 27-20030 (2), 27-20642, 27-29502, 27-29504, 27-29508, 27-29509 and 23014A1 Diaphram kit, copper gaskets 27-29582 see below.
Price $64.00
Copper exhaust O Ring gaskets, 27-29582
Price Set of two rings $15.00
Two sets sold together, four rings $24.00
Plus shipping of $5.00
Printed Material
1962-1967 Speedliner Decals $ 30.00 set
90-26116 Mark 20H Parts list $ 5.00
Instructions, Mark 20H Conversion, 16:21 Gears & Tiliston Carb. $ 5.00
Harry Brinkman's manual on how to modify your Mercury for more horsepower is being published by Aeroliner Race Boats, LLC. This is Manual number 2 first published in 1994 by Harry Brinkman. We hope to be able to read through Harry's notes and incorporate them into an updated version some time in furture. But until then this treatise is the best of the best knowledge on this subject.
Price $ 40.00plus shipping
Mercury Mark 20H, Description of an Unmolested Engine

This article shows and describes the exterior & powerhead of an unmolested Mark 20H Included are many photos with a running explanation as the cowlings were removed for the first time. Part numbers, a full parts list, covers of the owners manual, owners envelope and a 1954 prices list are included. A history of the 1959 conversion kits with a photo of the prototype exhaust, together with an explanation of the developement by Charlie Strang, an interview with Jack Leek and the patent issued are part of the article. In all there 76 pages with over 80 color photos.
Price $35.00 plus shipping