If the space is blank the information is not available to us at the moment. Note: A letter "D" at the end of a model name signifies that this engine has a stellite exhaust valve and seat installed. Therefore an Model VE4 engine is the same as a VE4D, a Model VP4 is the same as a VP4D, etc. Except for the AC4 all engines have bore sizes in 1/4" increments. Measure your bore first to narrow down the choices.

Model	Bore	Crank Case Casting #	Head Casting #	Con Rod Casting #	Carb #	Magneto #
AC4	2-5/8"	.	.	.	.
AM4	3-1/4"	.	.	.	.
AP4	3-1/2"	.	.	.	.
VD4	2-3/4"	.	.	.	.
VE4D	3.0	BA48A previous to ser # 3106939 has a 5-1/2" dia. bore for the main bearing plate pilot and BA48C beginning serial # 3106939 has a 5-7/8" dia. bore for main bearing plate pilot	AB80 replaced by AB80A, rb AB80E rb AB80G rb AB100B	DA51B babbitt lined replaced by DA51C that uses shell bearings	Wisconsin # L-45-11 Stromberg # 4260260, L48, Zenith # 10034E replaced by L63 series Zenith carb	Wisconsin # Y41 (FM # FMJV4B7), Y54 (Wico # XH1343B), Y74 ((FM # FMXV4B7),Y86 and Y106 (FM # FMZB4B7) series mags
VF4D	3-1/4"	BA48A previous to ser # 3106939 has a 5-1/2" dia. bore for the main bearing plate pilot and BA48C beginning serial # 3106939 has a 5-7/8" dia. bore for main bearing plate pilot	AB86 replaced by AB86A rb AB100A	DA51B babbitt lined replaced by DA51C that uses shell bearings	Wisconsin # L-45-20 Stromberg # 426041, L48-2, Zenith # SZ-632-B, replaced by L63 series Zenith carb(same as VE4D)	Wisconsin # Y41 (FM # FMJV4B7), Y54 (Wico # XH1343B), Y74 ((FM # FMXV4B7),Y86 and Y106 (FM # FMZB4B7) series mags
VG4D	3-1/2"	BA49A	AB111	DA66A babbitt lined replaced by DA66B that uses shell bearings	Common one is Wisconsin #L571S1, Zenith # 11532 or less common Wisconsin # L54J1S1 Marvel Schebler # VH69A	Wisconsin # Y95, Y97 and Y98 series mags
VH4D	3-1/4"	BA48C	AB100 relaced by AB100F for gasoline, AB110B replaced by AB100E (TJD head) can be found on propane equipped engines.	DA68 babbitt lined replaced by DA68A that uses shell bearings	Common ones are Wisconsin # L63 series Zenith carbs or L64 series Marvel Schebler carbs	Most commonly used mag is Wisconsin # Y92S2, FM # FMX4B7A
VM4	3-1/4"	.	.	.	.
VP4	3-1/2"	.	.	.	Wisconsin # L54 series, Marvel Schebler VH16, 22, 20, 23, 30, 45, 49, 69A, and 71	Wisconsin # Y54 and Y106 series mags
VR4D	4-1/4"	.	.	.	Wisconsin # L56 (Zenith # 12054B and L56B, Zenith # 12311A	Wisconsin # Y94 series mag
W4-1770	3-1/4"	BA48C	AB100 for gasoline, AB110B (TJD head) can be found on propane equipped engines.	DA68A	Most common ones are Wisconsin # L57 series, Zenith series 87A8	Most commonly used mag is Wisconsin # Y92S2, FM # FMX4B7A
V460D	3-1/2"	BA55 previous to serial # 4904657	AB105 This engine is OHV	DA71 replaced by DA71A	LZ77S1 Zenith # 12708	.
V461D	3-1/2"	BA55 previous to serial # 4904657and BA55C BEG SER #4904657	AB105 This engine is OHV	DA71 replaced by DA71A	LZ77BS1 Zenith # 12708, replaced by LZ77GS1 Zenith #13993, replaced by LZ77LS1	Wisc # Y127S1, Fm # FMXZF4B7C or Wisconsin # Y128S1, FM # FMX4B71
V465D	3-3/4"	BA55B previous to ser # 4904657 and BA55E beginning serial # 4904657	AB105A This engine is OHV	DA71 replaced by DA71A	LZ77BS1 Zenith # 12708, replaced by LZ77GS1 Zenith #13993, replaced by LZ77LS1 at serial # 6271139	Wisc # Y127S1, Fm # FMXZF4B7C or Wisconsin # Y128S1, FM # FMX4B71

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