Bob's Resource Website (2007)
R3 / R4 technical Data
According to Studebaker, the R3 - 304.5 cubic inch block was bore is..3 -
21/32". The piston people say 3 - 5/8" + 0.093". The original R3 also has
pistons manufactured by Forge True and can be identified by either an
embossed Studebaker 'S' logo or Embossed Forge True logo on the top of the
piston. The R3 cylinder block serial number will start with a 'B' in place of
a 'R' or 'RS' My R3 engine is serial number B110 and Carolyns R2 number is
RS2117. An R3 engine block has the top of the cyilinder walls relieved,
looks like some one at Paxton took a half round file to the front and rear
edge of the cylinder wall at the deck. This was done to allow better flow
around the larger and wider spaced valves. I hope this answers some of your questions.
Doug Crall
(314)355-9951 / ccrall@aol.com
R3-R4 power ratings
Engine Specs
R3 / R4 Engine pics, courtesy of Paul Johnson
Mike Float, Clone R4
R4 Parts
Lionel Stone R3 Heads
R3 Specific Parts
Control Arms
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Upper inner pin
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R3 Transistor Ignition Blueprints
R3 Parts
Intake gasket
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Rear drum backing plates
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Upper control arms
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Axles
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Upper inner bushings / pin
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R3 Head gasket
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R3 Manifold & Headers
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Pistons
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Pistons
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8" Crank Pully
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Nelson Bove's R3 Daytona
Read about an R3 Daytona Purchase
Notes
531191 NOS pin and bushing kit. Upper inner a-arm 1951 - 1952 All. 1962 - 1964 Y1 - Y3 - P3 - F3. 1963 - 1964 Avanti R3, R4. Can be used on all 1951 - 1966 cars and Avanti 1963 - 1983 if using upper A- arm number 527921
R3 suspension miscellaneous
What happened to the DUO CENTO?
Change to R3 upper control arms