Also please look at our track and dyno proven line burr ported manifolds. The video above is a simple, condensed how to guide on cylinder head porting and polishing. This is short video using flow strings and flow ball in a harley davidson cylinder head. Speier racing heads offers full hand porting on all brands of cylinder heads and manifolds. Henderson deserves kudos for employing a novel camago. I believe chad speier used proheader cores for his budget import casting heads. This is part of our harley davidson performance seminar coming soon. Vizards vortec cylinder head porting and the views increased about like they. Chad gained experience for cnc type equipment while working for the worlds leader in billet connecting rods, grp and mgp. Stan weiss cylinder head flow data at 28 inches of water dfw. Some flow numbers for chad speier heads come from their web site. Cylinder head porting basics harley porting seminar youtube. Srh in vizard bbc book terry walters and i did mud motor that had to have iron heads. David vizard please note most builds are not max effort.
Heads srh cnc heads srh head manifold porting speier racing heads offers full hand porting on all brands of cylinder heads and manifolds. What is cylinder head porting, and how does it increase horsepower. No idea what you are building tho so port size wise idk what would be best. I know, i have already talked to darin,chad, joe, and every cylinder head. Chevy with a set of chad speierported profiler heads hogged out to. Read the tech article on doityourself smallblock cylinder head porting, brought to you by the experts at chevy high performance magazine. Mark continued, i have been watching what chad has been doing for a while, and he is a talented man with a grinder. It is meant for novice and inexperienced porters who want to know what is porting and polishing and how. Thoughts on these two cylinder heads with similar porting programs. What is cylinder head porting, and how does it increase. The 407 smallblock chevy from henderson power sports qualifies on day two of engine. The most critical areas when porting a cylinder head are those which pass the most air at the highest speed and for the longest duration, the port is at or near the valve seat, optimizing airflow.
Chad began porting heads in the mid 90s after spending several years working at madcap racing engines in denver, colorado. Again, roof length plus floor length divided by two. Its a job for only the mostskilled of mechanics, but head porting can lead to some impressive power gains if performed properly. Arent you the one that had a set of heads done by speier racing heads. You can search this page by using your browsers edit find command. Another key to the personnel puzzle was cylinder head man, chad speier. Cylinder head porting and polishing how to diy guide. Chads cylinder heads and intakes have had positive results in all forms of racing. Porting of a cylinder head returns the most bang for the buck, especially if the camshaft and intake manifold are also changed. Ive been thinking of changing up my package for the profiler cnc heads. If for any reason you purchase a set of heads from srh or have yours ported, and they dont perform like we discuss, send them back and i will work on them until they do at no cost to you. Srh has become one of the leading suppliers of properly designed powerful cnc heads. From nhra records to working with major cylinder head companies, let our knowledge.
Gary collander did you show these to chad spier or darin morgan. Its my duty to provide results rather than a number. The basic problem with the big rectangularport factory heads is that it. On the dyno, the chad speiermodified heads proved their worth by. Well the targets were exceeded by a bunch as the attached power curves show. I was pleased at the outcome of the first head porting seminar that marvin and i put on.
Doityourself smallblock cylinder head porting tech. All flow numbers for bob legere ported heads came from him updated march 09 and. Modern cylinder head can port all types of heads from full blown race cars to mild street cars. Cylinder head porting head games modified magazine. Our math is telling us to achieve 7000 rpm from a 434 cid, we need 2. Chad speier has been porting cylinder heads for well over 20 years. Power tec 10 ep5 david vizards vortec cylinder head porting. Srh proudly ports iron cylinder heads, call for quote. Power tec 10 ep5 david vizards vortec cylinder head porting, duration.