[Tigers] Hipo Heads

[Thomas Witt]

I did a search of Google images under hipo 289 and found this image.  Would 
this "HP" be the HiPo indictor?
http://www.google.com/imgres?imgurl=http://mackrafab.com/vmf/images/hp_head.jpg&imgrefurl=http://www.xiongdudu.com/image/Ford_Engine_Specs/10&usg=__5V_4J1Y_buloq02ghaXcLCq0OVY=&h=384&w=512&sz=30&hl=en&start=28&zoom=1&tbnid=hhObZs0acy-iQM:&tbnh=125&tbnw=170&prev=/images%3Fq%3D289%2Bhipo%2Bheads%26hl%3Den%26safe%3Doff%26client%3Dfirefox-a%26sa%3DG%26rls%3Dorg.mozilla:en-US:official%26biw%3D1440%26bih%3D710%26gbv%3D2%26tbs%3Disch:10%2C646&itbs=1&iact=hc&vpx=1140&vpy=333&dur=971&hovh=194&hovw=259&tx=195&ty=114&ei=eNR9TMXxNJKqsAPfw43BCw&oei=jtN9TPWBJoW8sAP53Pz0Cg&esq=13&page=2&ndsp=28&ved=1t:429,r:20,s:28&biw=1440&bih=710

Tom
----- Original Message ----- 

> Hi Group,  recessed valve springs and screw in studs and 64 cc chambers 
> are
> easily fabricated in a good auto machine shop,  done all the time for a
> "warmed up"  engine job,  it makes the heads work great,  but original,
> atleast early Hipo heads have the casting,  Clyde