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Main Jet Performance Upgrade Kit For GX390 and Predator 420cc Main Jet Performance Upgrade Kit For GX390 and Predator 420cc

Our main jet kit is a must for the Honda GX390, Predator 420cc engines that have had the performance K&N style air filter setup installed on the engine. Maximizes the engine for best performance and air fuel ratio.

Our Price: $8.14
Side Cover Gasket, 10 Bolt 460cc Big Block Side Cover Gasket, 10 Bolt 460cc Big Block

10 bolt side cover gasket for the 440cc and 460cc 10 bolt side cover

List Price: $11.44
Our Price: $9.95
Sale Price: $8.96
Savings: $2.48
Head Gasket Fits GX440 and 460cc Engines 92mm Bore MLS Head Gasket Fits GX440 and 460cc Engines 92mm Bore MLS

Our Multi Layer Steel (MLS) head gasket fits the 440cc and 460cc big block clone engines with 92mm bore size.

List Price: $14.89
Our Price: $12.95
Sale Price: $11.66
Savings: $3.23
Air Filter Adapter for Mikuni 38mm Super BN Carburetor Air Filter Adapter for Mikuni 38mm Super BN Carburetor

Bullfrog Performance Products air filter adapter for Mikuni 38mm Super BN carburetor.

List Price: $38.95
Your Price $27.50
Sale Price: $19.95
Savings: $19.00
Head Gasket, 93mm Bore for 440cc and 460cc Engines Victor Reinz Head Gasket, 93mm Bore for 440cc and 460cc Engines Victor Reinz

Head gasket fits 440cc and 460cc big block engines.  Made by automotive gasket supplier Victor Reinz.

List Price: $29.95
Our Price: $24.95
Savings: $5.00
Cylinder Deck Spacer 1/2" Thick Big Block Cylinder Deck Spacer 1/2" Thick Big Block

Bullfrog Performance Products cylinder deck spacer fits 460cc big blocks with 92mm bore x 1/2" thick and is used to increase the deck height of the cylinder block.  It is preferred to weld our spacer onto your block and re-sleeve the cylinder for best results.

List Price: $43.47
Our Price: $37.80
Sale Price: $34.02
Savings: $9.45
Cylinder Deck Spacer 1/4" Thick Big Block Cylinder Deck Spacer 1/4" Thick Big Block

Bullfrog Performance Products cylinder deck spacer fits 460cc big blocks with 92mm bore x 1/4" thick and is used to increase the deck height of the cylinder block.  It is preferred to weld our spacer onto your block and re-sleeve the cylinder for best results.

List Price: $43.47
Our Price: $37.80
Sale Price: $34.02
Savings: $9.45
Header Kit, GX390 Mud Motor Header w/Muffler Straight Header Kit, GX390 Mud Motor Header w/Muffler Straight

Mud Boat header kit that fits the big block Honda GX240, GX270, GX340, GX390, Predator 420cc and 460cc engines. Our header kit features 1 1/4" O.D. header tube and is TIG welded for best durability. Our header kit includes the following components:

  • Straight header tube to fit mud motor specifically
  • Our custom TIG welded header flange
  • Screw on muffler

Our Price: $36.00
Header Kit, GX390 Mud Motor Header w/Muffler Angled Header Kit, GX390 Mud Motor Header w/Muffler Angled

Mud Boat header kit that fits the big block Honda GX240, GX270, GX340, GX390, Predator 420cc and 460cc engines. Our header kit features 1 1/4" O.D. header tube and is TIG welded for best durability. Our header kit includes the following components:

  • Header
  • Our custom TIG welded header flange
  • Screw on muffler

Our Price: $38.00
Bullfrog Pro Velocity High Performance Air Filter Kit for Honda GX390 Bullfrog Pro Velocity High Performance Air Filter Kit for Honda GX390

Our Pro Velocity high performance air filter kit fits Honda GX340, GX390, Predator 420cc and 460cc big block clone engines. Upgrade your go kart, mini bike or drift trike with our high performance air filter kit. Our kit includes the following items:


  • High flow racing style air filter 4" filter length
  • Foam Pre-Filter
  • Radiused air filter adapter
  • Choke hold bracket

Our Price: $44.95
Titanium Exhaust Valve 6mm Stem, 35mm O.D., 3.650" Length Titanium Exhaust Valve 6mm Stem, 35mm O.D., 3.650" Length

Titanium Exhaust valve for the Honda GX340, GX390, 460cc big block engines. Our titanium exhaust valve has a 35mm diameter head with 6mm diameter stem and is 3.650" overall length. This valve is also DLC coated to prevent wear between guide and seat contact area.
Limited quantity available so get this valve while it is available!

Our Price: $100.00
Titanium Exhaust Valve 6mm Stem, 45mm O.D., 3.650" Length Titanium Exhaust Valve 6mm Stem, 45mm O.D., 3.650" Length

Titanium Exhaust valve for the Honda GX340, GX390, 460cc big block engines. Our titanium exhaust valve has a 45mm diameter head with 6mm diameter stem and is 3.650" overall length. This valve is also DLC coated to prevent wear between guide and seat contact area.
Limited quantity available so get this valve while it is available!

Our Price: $100.00
92.25mm Forged Flat Top Piston Kit 460cc, 1.100" Comp Height 92.25mm Forged Flat Top Piston Kit 460cc, 1.100" Comp Height

Bullfrog Performance Products forged flat top piston kit for the 440cc and 460cc big block engine.  This forged piston kit is an 92.25mm (.010" overbore) for the 440cc and 460cc engine.  Our piston fits our 4.440" length billet rod or the ARC Racing connecting rods.

List Price: $224.25
Our Price: $195.00
Sale Price: $175.50
Savings: $48.75