Shop By Product Matching "Proform"
Choose your Submodel for your 1978 GMC C25
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- 16 Pcs
- SB Chevy Std Length 16 Pcs Finish: Black Oxide Material: 4130 Chromoly Steel Stud Diameter (in.): 5/16 in.
- Sold As Set Of 16 Pieces
- Product Attributes:
- Category: 1-piece Pushrod Set
- Feature/Benefit: Heat-treated .065 Wall Thickness 4130 Chrome Moly, For Use With Guide Plates.
- Applications: Chevy Small Block Engines
- Exhaust Overall Length: 7.800 In.
- Make: Chevrolet
- Material: 4130 Chromoly Steel
- Pushrod Style: 1-piece
- Stud Diameter (in.): 5/16 In.
- Finish: Black Oxide
- Intake Overall Length: 7.800 In.
- Heat-treated .065 wall thickness 4130 chrome moly, for use with guide plates. 25% thicker walls than a major competitor's brand. Gloss black finish. Premium one-piece pushrods for the price of competitors 3-piece! Each end is precision formed with specified radius for optimum wear characteristics with minimal metal-to-metal friction. 16 pieces per package.
-
Suggested Purchase Quantity: 16
- Most jobs typically require 16 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 5.0L | 305 |
- 100% New
- 80 AMP; 1 Wire Style; Machined Pulley; Chrome Finish; 100% New
- Sold Individually
- Product Attributes:
- Brushless: No
- Voltage: 12 Volt
- Ground Type: Positive
- Pulley Diameter: 2 1/2 Inch
- External Fan Included: Yes
- Case Material: Aluminum
- Case Color: Chrome
- Fan Type: Internal
- Amperage Rating: 80
- Amperage Output: 80 Amp
- Family: 10si Style
- Finish: Chrome
- Case Circumference: 17.5
- Drive End To Rotor Shaft End Distance: 6
- AC Service Tap: No
- Category: Alternators
- Applications: Chevy Small Block 305 To 350 Engines 1972 To 1987; Chevy Big Block 402 To 454 Engines 1970 To 1986; Pontiac 326 To 455 Engines 1962 To 1979; Oldsmobile 215 To 455 Engines 1963 To 1984; Buick 215 To 455 Engines 1963 To 1977
- External Regulator Included: Yes
- Case Style: 10si Style
- Regulator Type: Internal
- Decoupled Or Clutch Pulley: Yes
- Distance Between Mounting Feet: 6.133
- Drive End To Pulley 1st Groove Distance: 1.4
- Feature/Benefit: A Manufacturing Break-through Has Enabled Proform To Offer 100% New Alternators With The Same Affordability As Our Popular Re-built Models!
- One Wire Capable: Yes
- Outside Pulley Diameter: 2.621
- Pulley Cogged Quantity: 1
- Plug Clock Rear View Main Mounting Ear at 6 O Clock: 2
- Pulley Belt Type: V-belt
- Pulley Groove Quantity: 0
- Mounting Type: Standard
- Can you tell the difference? Most chrome alternators look nearly the same, and that's why what's on the inside is so critical. Reliability starts with how it's made. Choosing PROFORM means choosing alternators with components produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment, with everything 100% new for maximum longevity and optimum performance. After assembly each alternator is individually tested at the factory. Finally, it's boxed with a quality assurance graph that documents the specific unit's output performance. We do the testing, not you! And PROFORM proves it!
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- 100% New
- 80 AMP 1 Wire Style Machined Pulley Chrome Finish 100% New
- Sold Individually
- Product Attributes:
- Brushless: No
- Voltage: 12 Volt
- Ground Type: Positive
- Pulley Diameter: 2 1/2 Inch
- External Fan Included: Yes
- Case Material: Aluminum
- Case Color: Chrome
- Fan Type: Internal
- Amperage Rating: 80
- Amperage Output: 80 Amp
- Family: 10si Style
- Finish: Chrome
- Case Circumference: 17.5
- Drive End To Rotor Shaft End Distance: 6
- AC Service Tap: No
- Category: Alternators
- Applications: Chevy Small Block 305 To 350 Engines 1972 To 1987; Chevy Big Block 402 To 454 Engines 1970 To 1986; Pontiac 326 To 455 Engines 1962 To 1979; Oldsmobile 215 To 455 Engines 1963 To 1984; Buick 215 To 455 Engines 1963 To 1977
- External Regulator Included: Yes
- Case Style: 10si Style
- Regulator Type: Internal
- Decoupled Or Clutch Pulley: Yes
- Distance Between Mounting Feet: 6.133
- Drive End To Pulley 1st Groove Distance: 1.4
- Feature/Benefit: A Manufacturing Break-through Has Enabled Proform To Offer 100% New Alternators With The Same Affordability As Our Popular Re-built Models!
- One Wire Capable: Yes
- Outside Pulley Diameter: 2.621
- Pulley Cogged Quantity: 1
- Plug Clock Rear View Main Mounting Ear at 6 O Clock: 2
- Pulley Belt Type: V-belt
- Pulley Groove Quantity: 0
- Mounting Type: Standard
- Can you tell the difference? Most chrome alternators look nearly the same, and that's why what's on the inside is so critical. Reliability starts with how it's made. Choosing PROFORM means choosing alternators with components produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment, with everything 100% new for maximum longevity and optimum performance. After assembly each alternator is individually tested at the factory. Finally, it's boxed with a quality assurance graph that documents the specific unit's output performance. We do the testing, not you! And PROFORM proves it!
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- 100% New
- Amperage Output:100 AMP; Case Style:10SI Style; Finish:Chrome
- Sold Individually
- Product Attributes:
- Brushless: No
- Voltage: 12 Volt
- Ground Type: Positive
- Pulley Diameter: 2 1/2 Inch
- External Fan Included: Yes
- Case Material: Aluminum
- Case Color: Chrome
- Fan Type: Internal
- Amperage Rating: 100
- Amperage Output: 100 Amp
- Family: 10si Style
- Finish: Chrome
- Case Circumference: 17.5
- Drive End To Rotor Shaft End Distance: 6
- AC Service Tap: No
- Category: Alternators
- Applications: Chevy Small Block 305 To 350 Engines 1972 To 1987; Chevy Big Block 402 To 454 Engines 1970 To 1986; Pontiac 326 To 455 Engines 1962 To 1979; Oldsmobile 215 To 455 Engines 1963 To 1984; Buick 215 To 455 Engines 1963 To 1977
- External Regulator Included: Yes
- Case Style: 10si Style
- Regulator Type: Internal
- Decoupled Or Clutch Pulley: Yes
- Distance Between Mounting Feet: 6.133
- Drive End To Pulley 1st Groove Distance: 1.4
- Feature/Benefit: This Alternator Can Be Clocked To All Four Positions By The User.
- One Wire Capable: Yes
- Outside Pulley Diameter: 2.621
- Pulley Cogged Quantity: 1
- Plug Clock Rear View Main Mounting Ear at 6 O Clock: 2
- Pulley Belt Type: V-belt
- Pulley Groove Quantity: 0
- Mounting Type: Standard
- Can you tell the difference? Most chrome alternators look nearly the same, and that's why what's on the inside is so critical. Reliability starts with how it's made. Choosing PROFORM means choosing alternators with components produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment, with everything 100% new for maximum longevity and optimum performance. After assembly each alternator is individually tested at the factory. Finally, it's boxed with a quality assurance graph that documents the specific unit's output performance. We do the testing, not you! And PROFORM proves it!
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- 100% New
- Amperage Output: 100 AMP Case Style: 10SI Style Finish: Chrome
- Sold Individually
- Product Attributes:
- Brushless: No
- Voltage: 12 Volt
- Ground Type: Positive
- Pulley Diameter: 2 1/2 Inch
- External Fan Included: Yes
- Case Material: Aluminum
- Case Color: Chrome
- Fan Type: Internal
- Amperage Rating: 100
- Amperage Output: 100 Amp
- Family: 10si Style
- Finish: Chrome
- Case Circumference: 17.5
- Drive End To Rotor Shaft End Distance: 6
- AC Service Tap: No
- Category: Alternators
- Applications: Chevy Small Block 305 To 350 Engines 1972 To 1987; Chevy Big Block 402 To 454 Engines 1970 To 1986; Pontiac 326 To 455 Engines 1962 To 1979; Oldsmobile 215 To 455 Engines 1963 To 1984; Buick 215 To 455 Engines 1963 To 1977
- External Regulator Included: Yes
- Case Style: 10si Style
- Regulator Type: Internal
- Decoupled Or Clutch Pulley: Yes
- Distance Between Mounting Feet: 6.133
- Drive End To Pulley 1st Groove Distance: 1.4
- Feature/Benefit: This Alternator Can Be Clocked To All Four Positions By The User.
- One Wire Capable: Yes
- Outside Pulley Diameter: 2.621
- Pulley Cogged Quantity: 1
- Plug Clock Rear View Main Mounting Ear at 6 O Clock: 2
- Pulley Belt Type: V-belt
- Pulley Groove Quantity: 0
- Mounting Type: Standard
- Can you tell the difference? Most chrome alternators look nearly the same, and that's why what's on the inside is so critical. Reliability starts with how it's made. Choosing PROFORM means choosing alternators with components produced by highly specialized machines, assembled by highly trained personnel using dedicated jigs and equipment, with everything 100% new for maximum longevity and optimum performance. After assembly each alternator is individually tested at the factory. Finally, it's boxed with a quality assurance graph that documents the specific unit's output performance. We do the testing, not you! And PROFORM proves it!
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- For Chevy V8 Engines
- HEI Distributor; Racing Type w/Vac-Adv;Housing Finish:Polished; Cap Color:Red
- 100% New
- Product Attributes:
- Rotation: Standard
- Housing Finish: Polished
- Voltage: 50,000 Volts
- Distributor Cap Included: Yes
- Grade Type: Performance
- Make: Chevrolet
- Gear Material: Cast Iron
- Trigger Type: Magnetic
- Advance Type: Mechanical And Vacuum
- Category: Distributors
- Marine Approved: No
- Applications: Chevy V8 Engines
- Vacuum Advance: 13 Degrees
- Ignition Box Required: No
- Feature/Benefit: Designed To Meet The High Performance Demands Of Racing Competition, These Units Fit Chevy Small Block And Big Block Engines.
- Shaft Material: Aluminum
- Cap Color: Red
- Rotor Rotation: Clockwise (right)
- Ignition Rotor Included: Yes
- Mechanical Advance: 22 Degrees
- Ignition Coil Included: Yes
- Coil Wire Included: Yes
- Terminal Type: Lead Wire
- Terminal Gender: Male
- Shaft Length: 9.65
-
Features:
- Designed to meet the high performance demands of racing competition, these units fit Chevy small block and big block engines.
- Designed to meet the high performance demands of racing competition, these units fit Chevy small block and big block engines. These 100% NEW distributors have all the reliable components of the 66940, but they also include a highpower 50,000 volt coil. This high-performance distributor produces a 50,000 volt spark through 7,500 RPM with true spark alignment for instantaneous response, a high performance curve, a premium cap with brass terminals, and a low-saturation ignition module. All have die-cast aluminum housings, polished to a brilliant billet-look appearance, except as noted.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- For Chevy V8 Engines
- HEI Distributor Racing Type w/Vac-Adv Housing Finish: Polished Cap Color: Red
- 100% New
- Product Attributes:
- Rotation: Standard
- Housing Finish: Polished
- Voltage: 50,000 Volts
- Distributor Cap Included: Yes
- Grade Type: Performance
- Make: Chevrolet
- Gear Material: Cast Iron
- Trigger Type: Magnetic
- Advance Type: Mechanical And Vacuum
- Category: Distributors
- Marine Approved: No
- Applications: Chevy V8 Engines
- Vacuum Advance: 13 Degrees
- Ignition Box Required: No
- Feature/Benefit: Designed To Meet The High Performance Demands Of Racing Competition, These Units Fit Chevy Small Block And Big Block Engines.
- Shaft Material: Aluminum
- Cap Color: Red
- Rotor Rotation: Clockwise (right)
- Ignition Rotor Included: Yes
- Mechanical Advance: 22 Degrees
- Ignition Coil Included: Yes
- Coil Wire Included: Yes
- Terminal Type: Lead Wire
- Terminal Gender: Male
- Shaft Length: 9.65
-
Features:
- Designed to meet the high performance demands of racing competition, these units fit Chevy small block and big block engines.
- Designed to meet the high performance demands of racing competition, these units fit Chevy small block and big block engines. These 100% NEW distributors have all the reliable components of the 66940, but they also include a highpower 50,000 volt coil. This high-performance distributor produces a 50,000 volt spark through 7,500 RPM with true spark alignment for instantaneous response, a high performance curve, a premium cap with brass terminals, and a low-saturation ignition module. All have die-cast aluminum housings, polished to a brilliant billet-look appearance, except as noted.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 7.4L | 454 |
- 16 Pcs
- SB Chevy;Std Length; 16 Pcs; Finish:Black Oxide; Material:4130 Chromoly Steel;Stud Diameter (in.):5/16 in.
- Sold As Set Of 16 Pieces
- Product Attributes:
- Category: 1-piece Pushrod Set
- Feature/Benefit: Heat-treated .065 Wall Thickness 4130 Chrome Moly, For Use With Guide Plates.
- Applications: Chevy Small Block Engines
- Exhaust Overall Length: 7.800 In.
- Make: Chevrolet
- Material: 4130 Chromoly Steel
- Pushrod Style: 1-piece
- Stud Diameter (in.): 5/16 In.
- Finish: Black Oxide
- Intake Overall Length: 7.800 In.
- Heat-treated .065 wall thickness 4130 chrome moly, for use with guide plates. 25% thicker walls than a major competitor's brand. Gloss black finish. Premium one-piece pushrods for the price of competitors 3-piece! Each end is precision formed with specified radius for optimum wear characteristics with minimal metal-to-metal friction. 16 pieces per package.
-
Suggested Purchase Quantity: 16
- Most jobs typically require 16 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 5.0L | 305 |
- SB Chevy
- Orange SB Chevy Mounting Bolt(s) Included: No Emblem Style: Raised/Milled Emblem Valve Cover Bolt Pattern: Perimeter Bolt Valve Cover Height: Tall Material: Die Cast Aluminum
- Sold As Pair
- Product Attributes:
- Emblem: Chevrolet & Bowtie Emblem
- Grade Type: Premium
- Mounting Hardware Included: No
- Grommets Included: Yes
- Oil Filler Cap Included: No
- Make: Chevrolet
- Valve Cover Bolt Pattern: Perimeter Bolt
- Hold Down Tabs Included: No
- Finish:
- Chevy Orange
- Painted
- Contains Oil Baffles: Yes
- Category: Valve Covers
- Cylinder Head Type: Ohv
- Applications: Chevy Small Block 262 To 400 Engines 1959 To 1986
- Material:
- Aluminum
- Die Cast Aluminum
- PCV Grommet Included: Yes
- Feature/Benefit: Valve Covers Feature Raised And Milled Aluminum Inchchevrolet Inch And Inchbowtie Inch Logos.
- Engine: Chevy Sb Gen 1
- Breather Grommet Included: Yes
- Valve Cover Gasket Included: No
- Valve Cover Height: 4 Inch
- Mounting Location: Perimeter
- Baffeled: Yes
- Surface Type: Logo
- Construction: Cast
- Material Thickness:
- 0.175
- 4.5
- Breather Cap Included: No
- Emblem Style: Raised/milled Emblem
- Mounting Bolt(s) Included: No
- Inside Clearance Height:
- 2.825
- 71.5
- Sheen Level: Semi-gloss
- Valve Cover Type: Tall
- These innovative valve covers have an aggressive design that will make your engine stand out at the show. These premium die-cast aluminum valve covers offer more internal clearance than most other valve covers because our innovative mold designs are at the forefront of modern die-casting technology. All valve covers with baffles include grommets. Sold in pairs.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 5.0L | 305 |
- SB Chevy
- Orange;SB Chevy; Mounting Bolt(s) Included:No; Emblem Style:Raised/Milled Emblem; Valve Cover Bolt Pattern:Perimeter Bolt; Valve Cover Height:Tall; Material:Die Cast Aluminum
- Sold As Pair
- Product Attributes:
- Emblem: Chevrolet & Bowtie Emblem
- Grade Type: Premium
- Mounting Hardware Included: No
- Grommets Included: Yes
- Oil Filler Cap Included: No
- Make: Chevrolet
- Valve Cover Bolt Pattern: Perimeter Bolt
- Hold Down Tabs Included: No
- Finish:
- Chevy Orange
- Painted
- Contains Oil Baffles: Yes
- Category: Valve Covers
- Cylinder Head Type: Ohv
- Applications: Chevy Small Block 262 To 400 Engines 1959 To 1986
- Material:
- Aluminum
- Die Cast Aluminum
- PCV Grommet Included: Yes
- Feature/Benefit: Valve Covers Feature Raised And Milled Aluminum Inchchevrolet Inch And Inchbowtie Inch Logos.
- Engine: Chevy Sb Gen 1
- Breather Grommet Included: Yes
- Valve Cover Gasket Included: No
- Valve Cover Height: 4 Inch
- Mounting Location: Perimeter
- Baffeled: Yes
- Surface Type: Logo
- Construction: Cast
- Material Thickness:
- 0.175
- 4.5
- Breather Cap Included: No
- Emblem Style: Raised/milled Emblem
- Mounting Bolt(s) Included: No
- Inside Clearance Height:
- 2.825
- 71.5
- Sheen Level: Semi-gloss
- Valve Cover Type: Tall
- These innovative valve covers have an aggressive design that will make your engine stand out at the show. These premium die-cast aluminum valve covers offer more internal clearance than most other valve covers because our innovative mold designs are at the forefront of modern die-casting technology. All valve covers with baffles include grommets. Sold in pairs.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1978 - GMC C25 | V | - | 8 Cyl 5.0L | 305 |
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