Because our heads are the best QUALITY and BARGAIN! And our CS is second to NONE!!
Having said that, DusterDoug has had great results doing his own deal with the RHS heads so that's proof you don't HAVE to get them from us.
We just put together a great package deal that works well, takes alot of abuse and will last a long time.
Because of the low installed height these heads exhibit when assembled with no spring pad work, it takes a really short spring. Those tend to wear out quicker than a taller spring. And if you do cut the spring pad down for the larger O.D. spring you take a serious chance of breaking into water or the roof of the intake port.
So be warned!!
The beehive spring fits the bill perfectly. And as for the Ferrea valves....neither they or Manley would do custom valves for us in any amount in their "budget" line so we are stuck with the higher end valve.
But they are tough as nails and will handle high compression, high rpm and NOS-Turbo-Blown applications at will.
Not bad for under 1400.00 complete.
Brian