Once its pressed-in it should be sized with a 0.3430 reamer. It should be shortened to 1.625" insertion length (length below the flange). VG-7501R is a universal guide that is almost exactly what is needed for the 351C, except its too long (assuming the valve stems are 0.3415 OD). The guide within the valve pocket will require a burr to knock it down. The upper part of the guide, in the middle of the spring seat, can be knocked down with a fly cutter. Its common these days to completely remove the cast-in guides and press-in the exposed style of guides. I perform the spring seat work and rocker arm pedestal work (if any) afterwards. Once the seats are ground that establishes the valve heights. But I always perform the valve guide work and pocket and combustion chamber blending work before I hand the head castings over to the seat grinder. I've always relied on others to perform the valve seat jobs, I've never owned valve seat grinding or cutting equip. They are 1.75 off the shelf, and 1.90 is about the max you can take them. Its very easy to open up the throat of the 2.19" intake pockets too far, and ruin the venturi. Roughly 0.3 inches less than the OD of the valve head, this applies to both intake and exhaust.
SUMMIT RACING PORTING KIT PLUS
You need room for a 0.060 wide intake seat, or a 0.080 wide exhaust seat, plus the 30 and 60 degree angles on either side of the seat. Street engine throats should be 85% of the valve head OD max, or enough to get the sonic choke above red line as a minimum. For a Pantera the flat roof in the exhaust valve pockets and the bump in the exhaust port roof can be eliminated.
Of course sharp edges, ridges, etc should be removed everywhere. The brakes are then adjusted and tested for reliable stopping power.These days I lean towards only profiling the portions of the valve pockets and combustions chambers into and out of the valve seats, and sizing the valve throats.
SUMMIT RACING PORTING KIT FREE
After this happens, the rear wheel is installed with care to make sure that the chain is tensioned properly and that the free wheel of the bike is in proper working order. Making sure your wheel is true is key to prolonging the life of your rims, and ultimately your whole bicycle. From there, the wheels are taken off individually for the truing process.
During this process, our technicians will go through each of the bearing components, ensuring a solid, smooth ride from the first turn of the cranks. Our certified team of technicians spend the time to fine tune the bike so you don't have to.
SUMMIT RACING PORTING KIT INSTALL
Just tighten the handlebars, install the front wheel,pedals and ride! This process is done with care, by our experienced professional technicians to ensure that your bike not only lasts, but most importantly is covered by any manufacturer's warranty. Our $99 Bike Assembly is here to help you maximize your riding time. Please allow 15-20 business days on select Framed custom built bikes. Since the assembly is performed by hand and per order, it may take 6-8 business days for the assembly of your new bike to be completed and shipped.
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