THESE ONLY HAVE 30 STREET MILES ON THEM! LIKE NEW! i got these on trade for some stuff and were going to use them but have desided to go with glidden stuff for hot street /nmra instead! these really have all the goodies check out www.brodix.com/heads/track1/html for more details . these are full cnc heads w/ 225cc intake port w/ s./s. 2.100 intake , a polished exhaust port w/ s./s. 1.60 exhaust valve ,cnc chamber,bowl blended,7/16 studs,5/16 guide plates ,multi- bolt pattern exhaust ,titanium 10 degree retainers & locks ,.700 springs for mechanical roller cam, they flow 334/221 out of the box and cost $2874.00 new ! buy them for 1800.00 what a steal !