Basic Blower Measurements This page is for basic blower measurements and is not intended for blueprint making or for specifics of any one individual blower. Blower Type/Manufacturer Named Size C.I.D./Rev (approx) Style Of Rotor Center Case/Rotor Length Center Case Height Photo Of Blower Detroit Diesel "GMC" Straight 71 series 2-71 136 c.i.d./rev 3 lobe 30º helix Ball/Roller bearing 4.875 inches Non-standard case side inlet   Detroit Diesel "GMC" Straight 71 series 3-71 210 c.i.d./rev 3 lobe 30º helix Ball/Roller bearing 7.500 inches 7.500 inches Detroit Diesel "GMC" Straight 71 series 4-71 280 c.i.d./rev 3 lobe 30º helix Ball/Roller bearing 10.000 inches 7.500 inches Detroit Diesel "GMC" Straight 71 series 6-71 420 c.i.d./rev (large bore) 3 lobe 30º helix Ball/Roller bearing 15.000 inches 7.500 inches Detroit Diesel "GMC" Straight 71 series (converted 8v71 to aftermarket case) 8-71 448 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 15.900 inches 7.500 inches   Detroit Diesel "GMC" "V" 71 series 6V71 338 c.i.d./rev 3 lobe 30º helix Ball/Roller bearing 12.000 inches 7.500 inches Detroit Diesel "GMC" "V" 71 series 8V71 448 c.i.d./rev 3 lobe 30º helix Ball/Roller bearing 15.900 inches 7.500 inches Detroit Diesel "GMC" Straight 53 series 2-53 70 c.i.d./rev 2 lobe straight Friction NON ball bearing 4.375 inches 5.750 inches Non-standard case side inlet Detroit Diesel "GMC" Straight 53 series 3-53 104 c.i.d./rev 2 lobe straight Friction NON ball bearing 6.500 inches 5.750 inches Detroit Diesel "GMC" Straight 53 series 4-53 SHORT BORE 120 c.i.d./rev 2 lobe straight Friction NON ball bearing 7.500 inches 5.750 inches   Detroit Diesel "GMC" Straight 53 series 4-53 LONG BORE 139 c.i.d./rev 2 lobe straight Friction NON ball bearing 8.700 inches 5.750 inches Detroit Diesel "GMC" "V" 53 series 6V53 SHORT BORE 174 c.i.d./rev 2 lobe straight Friction NON ball bearing 10.900 inches 5.750 inches Detroit Diesel "GMC" "V" 53 series 6V53 LONG BORE 209 c.i.d./rev 2 lobe straight Friction NON ball bearing 13.100 inches 5.750 inches Detroit Diesel "GMC" "V" 53 series 8V53 330 c.i.d/rev 3 lobe 30º helix Ball/Roller bearing 15.000 inches 6.500 inches Eaton M-45 45 c.i.d./rev 3 lobe 60º helix Ball/Needle bearing 4.921 inches Non-standard case rear inlet Eaton M-62 62 c.i.d./rev 3 lobe 60º helix Ball/Needle bearing 4.921 inches (taller rotors) Non-standard case rear inlet Eaton M-90 90 c.i.d./rev 3 lobe 60º helix Ball/Needle bearing 5.433 inches Non-standard case rear inlet Eaton M-112 112 c.i.d./rev 3 lobe 60º helix Ball/Needle bearing 5.386 inches (taller rotors) Non-standard case rear inlet B & M 144 144 c.i.d./rev 2 lobe straight Ball/Ball bearing 8.700 inches 5.750 inches   B & M 174 174 c.i.d./rev 2 lobe straight Ball/Ball bearing       B & M 250 250 c.i.d./rev 2 lobe straight Ball/Ball bearing       Weiand/Holley Pro Street 142 Pro 142 142 c.i.d. 2 lobe straight Ball/Ball bearing 8.700 inches 5.750 inches   Weiand/Holley Pro Street 144 Pro 144 144 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing 8.700 inches 5.750 inches   Weiand/Holley Pro Street 174 Pro 174 174 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing       Weiand/Holley Pro Street 177 Pro 177 177 c.i.d./rev 2 lobe straight Ball/Ball bearing       Weiand/Holley Pro Street 250 Pro 250 250 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing       Weiand/Holley Pro Street 256 Pro 256 256 c.i.d./rev 2 lobe straight Ball/Ball bearing       Weiand/Holley 6-71 6-71 411 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 15.000 inches 7.500 inches   Weiand/Holley 8-71 8-71 436 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 15.900 inches 7.500 inches   Weiand/Holley 10-71 10-71 469 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 17.100 inches 7.500 inches   Weiand/Holley 12-71 12-71 497 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 18.100 inches 7.500 inches   Weiand/Holley 14-71 14-71 522 c.i.d./rev 3 lobe 30º helix Ball/Ball bearing 19.000 inches 7.500 inches   Camden Five Inch 80 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing 5.000 inches 5.500 inches   Camden Seven Inch 112 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing 7.000 inches 5.500 inches   Camden Nine Inch 144 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing 9.000 inches 5.500 inches   Camden Twelve Inch 192 c.i.d./rev 2 lobe straight w/teflon Ball/Ball bearing 12.000 inches 5.500 inches   Original S.Co.T Italmeccanica Italian made 4500cc Same internally 275 c.i.d./rev boost up to 6psi 2 lobe straight cast rotor Ball/Ball bearing 8.700 inches 7.750 inches   Original S.Co.T Italmeccanica Italian made 4000cc Same internally 275 c.i.d./rev boost up to 6psi 2 lobe straight cast rotor Ball/Ball bearing 8.700 inches 7.750 inches   New improved S.Co.T H&H Flatheads Italmeccanica U.S.A. made "S.Co.T." Blower 142 c.i.d./rev boost up to 10+ psi 2 lobe straight billet rotor Ball/Ball bearing 8.700 inches 7.750 inches

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