The pump part number is Melling M55HV and here is a SBC pump with a plate and pressure guage:
http://wasteveggieoilexplorations.shutterfly.com/48
THere is a junk yard in Hazelton and I"m sure that a used pump will down just as well as new... but cheaper.
Its a high volume pump that replaces OEM.. here's a list of cars that should have the pump or a similiar one:
categories > Automotive > Parts > Auto (45996)
1958 to 1994 CHEVY BUICK GMC ISUZU OIL PUMP HIGH VOLUME MELLING M55HV
1958 to 1994 CHEVY BUICK GMC ISUZU OIL PUMP HIGH VOLUME MELLING M55HV
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New In Box - New Old Stock CLOSEOUT!
FITS the Following GM and Isuzu applications
Buick 94-99 3.1L Vin M, 90-93 Vin T, 00-05 3.1L Vin J (Century), 02-05 3.4L Vin E(Rendevous)
Chevy 90-95 3.1L Vin D (Lumina APV), 99-03 3.1L Vin J (Malibu), 94-99 3.1L Vin M, 90-94 3.1L Vin T, 1993 3.1L Vin W, 96-04 3.4 Vin E (Lumina Van, Venture, Monte Carlo and Impala), 93-95 3.4 Vin S and 04-05 3.5L Vin 8 (Malibu and Uplander). Chevy/GMC Trucks 90-93 with the 2.8L Vin R.
Isuzu Trooper 90-91 with 2.8L Vin R GM engine, 91-94 Pick-up and Rodeo with the 3.1L Vin Z GM engine.
Oldsmobile 90-95 3.1L Vin D (Silhouette Van), 99 3.1L Vin J (California Emissions Only), 93-99 3.1L Vin M, 90-93 3.1L Vin T, 96-04 3.4L Vin E (Silhouette, Alero).
Pontiac 90-95 3.1L Vin D (Transport), 00-03 3.1 Vin J (Grand Prix), 94-99 3.1L Vin M, 90-94 3.1L Vin T, 96-04 3.4L Vin E (Firebird,Grand Am,Grand Prix,Transport,Aztek and Montana. 93-95 3.4L Vin S and 2005 3.5L Vin 8 (G6 and Montana).
Manufacturer's Application List Chevrolet
200,229,262,265,267,283,305,307,327,348,350,400 and 409ci engines in the following applications; 77-87 Buick cars with the Chevy 305ci Vin's G,H & U, 77-79 Buick cars with the Chevy 350ci Vin L, 93 Buick with the Chevy 350ci Vin 7 and 94 Buick with the Chevy 350ci Vin P(LT1). 91-92 Cadillac cars with the Chevy 305 Vin E, 90-93 Cadillac cars with the Chevy 350ci Vin 7 with the 5/8" dia.inlet hole, 94 Cadillac cars with the Chevy 350ci Vin P with the 5/8" dia.inlet hole. 78-79 Chevy cars with the 200ci V-6 engine, 75-76 Chevy cars with the 262ci V-8 engine, 85-92 Chevy cars with the 4.3L (262) Vin Z V-6 engine, 94 Chevy cars with the 4.3 (262) Vin W V-6 engine with the 5/8" dia.inlet hole, 79-82 Chevy cars with the 267ci engine, 58-67 Chevy cars with the 283ci engine (except the 64-67 Chevy II), 76-93 Chevy cars with the 305ci All Vin's with the 5/8" dia.inlet hole, 68-73 Chevy cars with the 307ci engine, 62-69 Chevy cars with the 327ci engine (except the 64-67 Chevy II), 58-61 Chevy cars with the 348ci engine, 67-94 Chevy cars with the 350ci Chevy engine All Vins with the 5/8" dia.inlet hole, 70-76 Chevy cars with the 400ci engine and 61-65 Chevy cars with the 409ci engine (except 65 with dual 4-barrell carbs). 78-79 Chevy/GMC trucks with the 200ci engine, 80-84 Chevy/GMC trucks with the 229ci engine, 90-91 Chevy/GMC trucks with the 4.3L (262ci) Vin B engine, 85-86 Chevy/GMC trucks with the 4.3L (262ci) Vin N engine, 92-93 4.3L (262ci) Vin W engine with the 5/8" dia.inlet hole, 86-94 Chevy/GMC trucks with the 4.3L (262ci) Vin Z engine with the 5/8" dia.inlet hole, 79-82 Chevy/GMC trucks with the 267ci engine, 57-67 Chevy/GMC trucks with the 283ci engine, 76-94 Chevy/GMC trucks with the 305ci engine with the 5/8" dia.inlet hole, 68-73 Chevy/GMC trucks with the 307ci engine, 62-68 Chevy/GMC trucks with the 327ci engine, 58-65 Chevy/GMC trucks with the 348ci engine, 69-94 Chevy/GMC trucks with the 350ci (all Vins) engine with the 5/8" dia.inlet hole, 74-80 Chevy/GMC trucks with the 400ci engine and 62-65 Chevy/GMC trucks with the 409ci engine.
Note: adds an additional 20% volume over stock oil pump. It is recommended to use an aftermarket Steel oil pump drive shaft (IS55E) with the steel collar attached instead of the factory shaft and plastic collar.