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Briggs Raptor Restrictor Plate (Purple .425")

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Our valve spring retainers fit our GX390 55lb. valve springs. These retainers will also fit our LCT 414cc racing engines and Honda GX610, GX620 and GX670 engines along with our valve springs. Upgrade the durability of your GX390 valvetrain by installing our retainers and bead lock setup!
*Color of retainers may be blue or silver sold as a set of two retainers*

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This guideplate fits any GX340 or GX390 Honda or Clone Big Block engine! This guideplate far outperforms the factory Honda or Clone Big Block guideplate design. Our guideplate will work with the factory rocker arms, our 1.12:1 rocker arms or our 1.3:1 rockers. Check out the features below:

Features	Benefits
Hardened guideplate	More durable and stable valvetrain operation
Slotted rocker stud holes	Gives engine assembler more adjustability
Slotted pushrod guide	Allows you to use our 1.3 ratio stamped rocker arms where the stock guideplate won't work. You also do not have to bend your Honda guideplate to get the chrome moly pushrods to work !
Thick	Will not flex at the pushrod area and will allow maximum clamp force for the rocker arm stud to prevent flexing at the guideplate stud mounting area !
Durable	Check out our picture comparison of the stock Big Block Clone guideplate above and you will notice that the stock guideplate is only .040" thick and very soft (notice the rocker arm studs digging into the factory guideplate material causing less clamp force !

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These billet aluminum roller rocker arms will fit Honda GX340/GX390 or any Clone 340 / 390! These have a rocker ratio of 1.3:1. We have put hours of dyno time on these rockers including track simulation testing on our dynamometer. These rocker arms are CNC machined from 7000 series aluminum alloy. They also incorporate bearing grade brass bushings to reduce rotational friction at the trunnion area. The roller tip is a precision ground hardened steel roller. The rocker shaft is a hardened steel shaft that will reduce any valvetrain flexing, unlike the stock rocker arm studs which flex under higher spring rate and rpm! The lash adjuster features a cupped pushrod area to house the pushrod end. This design eliminates the need for the factory pushrod guideplate, rocker arm studs, and factory adjuster nuts! The lash adjuster nut is a 12 point ARP fastener. These rockers will eliminate the weak design of the factory valvetrain components and also come with complete installation instructions.

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Put some life into your Honda GX340, GX390 engine by adding our billet aluminum custom fabricated intake manifold! Our manifold is a direct bolt on part that doesn't require any other fabrication to make it fit. Our intake includes the intake bolts, intake gasket and pulse fitting. If you do not need the pulse fitting just plug it with an 1/8"npt plug. Either way it is there for you so there is NO drilling necessary to add this feature. Don't forget to add our Mikuni 32mm racing carburetor in either a round slide or flat slide version. The throttle response and power increase is awesome!

Specifications
Billet aluminum design	6061 T-6 aluminum
Manifold OAL	2" (50.79mm)
Flange thickness	3/8" (9.53mm)
Pulse fitting thread	1/8" NPT
Port I.D.	1.292" (32.82mm)

Features	Benefits
Longer runner length than factory spacer	More torque and horsepower
Increased airflow	More power especially when used with our Mikuni 32mm carbs!

Parsons Racing Engines customer with Mini Trike build!

This is our 414cc engine designed to work with this mini trike platform. Click on the blue link above and view this really cool video! We build engines for all types of applications from these minichoppers, minibikes to Jr. Dragsters and karts! We have an in house Superflow 300 flowbench, Bridgeport milling machines, Engine Dynamometer and design and create our own cam profiles to work with your application.

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