GENERAL OEM STYLE REBUILDING
PERFORMANCE HEAD WORK
HEAD PORTING AND FLOWBENCH
Here is a brief explanation of porting and flow measurement using a flow bench.
When a cylinder head is brought to us for performance modification, all above standard services are performed first, ie cleaning, crack checking, and a basic valve job is performed to seal everything up. From this point a dummy (light pressure) valve spring is installed on both the inlet and exhaust valves that are to be used. Then a cam lift simulator (valve opener to check flow at various cam lifts) and a plate with the actual finished bore of your engine is installed. The ports are then measured for flow, usually at .050 valve lift increments, and the results are recorded giving us a baseline. Port, seat and valve modification is then performed, usually on one cylinder's ports with periodic rechecking to determine gains. Once adequate gain is attained all other ports are then modified in a similar fashion until all are equal in both poured volume and flow numbers and finished results are recorded. Head(s) are then cleaned and reassembled final flow numbers are supplied to customer upon pickup.
The largest limitation of a flow bench is the tooling needed, all that must be made not bought, to open the valves and simulate cylinder bores. We have an extensive amount of tooling for this already made, however there are heads we are not yet "tooled up for". Here is what we currently are..
NOTE: If you are serious about performance and in need of porting and your head is not above "tooled for" list, bear in mind as we've tried to demonstrate throughout this site, we are willing to make nearly any adaptation to our tooling to meet demands. Simply call with your head make and we will discuss options. Please understand however, there is literally dozens of hours spent to make the tooling we already have that we do not bill customers for because we keep it, so please have a serious inquiry.