D.I.Y. port work

[grumpyvette]

NO ITS NOT "HARD" but it does take both time and some skill to do correctly.you CAN,T JUST HOG OUT EVERYTHING IN REACH with a grinder and expect good results

 

this might help

 

 

(1) open throat to 85%-90% of valve size

(2)cut a 4 angle seat with 45 degree angle .065-.075 wide where the valve seats and about .100 at 60 degrees below and a .030 wide 30 degree cut above and a 20 degree cut above that rolled and blended into the combustion chamber

(3)blend the spark plug boss slightly and lay back the combustion chamber walls near the valves to the edge of a head gasket

(4)narrow but don,t shorten the valve guides

(5) open and straiten and blend the upper two port corner edges along the port roof

(6) gasket match to/with an intake gasket and raise the port roof slightly

(7) back cut valves at 30 degrees

(8) polish valve face and round outer edges slightly

(9)polish combustion chamber surface and blend edges slightly leaveing no sharp edges

(10) remove and smooth away all casting flash , keep the floor of the port slightly rough but the roof and walls smoothed but not polished.

(11) use a head gasket to see the max you can open the combustion chamber walls

(12) blend but don,t grind away the short side radias

 

 

http://www.ws6transam.org/ported.html

 

http://www.sa-motorsports.com/diyport.shtm

 

http://www.eecis.udel.edu/~davis/z28/buildup/plenum/

 

http://www.babcox.com/editorial/us/us110128.htm

 

http://www.diyporting.com/Shrouding.html

 

http://www.babcox.com/editorial/ar/eb120121.htm

 

http://www.diyporting.com/flowbench.html

 

http://victorylibrary.com/mopar/bench.htm

and YES ,(depending on the application) it CAN give a very noticable improvement in flow and hp