Magnum 360 heads "best" for my build?

moper said
That is a very good looking rocker setup... Just what the RHS/Indy's NEEDED. As far as the cam... Comp probably thinks the XE268 will have problems with the stock valve/spring package and 1.6 ratio rockers (comes to .512 lift at the lifter... prob closer to .490 in reality at the valve but they don't want to risk it). So they gave you basically the XE262 spec lobes.

I was planning on new valve springs anyway, the 901 springs they recommend will tolerate about .510 lift but I don't want to go that high. The installed height of my current springs/retainers is 1.670 (with .060 safety margin already figured in,) the 901 springs will bind at 1.160 - seems they will work for up to .512 lift, or less wtih the 20-223-3 cam; if I go that route with 1.6 rockers

rumblefish360 said
The cam is more suited to the small carb size, gear ratio/tire size and stock head set up than a larger cam is. This is why I also suggested a 3.55 gear with a 26 inch tire.

I am seriously leaning towards the 2.94 or 3.21 gears, converter stall TBD, purely from a fwy economy point of view. If I had an OD trans, 3.73 would be my choice ratio, but I do have those 3.91s ready to bolt in... tempting

The "LA" heads have a 1.5 and a 1.6 as the extra lift arm. As far as I know, you can not get a 1.5 rocker for the Magnum head.

I could if I use SBC rockers. I have a set of stock vortec 1.5 SA stamped rockers off my 906 vortec heads... Hmmm

A slant 6 rad. is not enuff to cool the engine well and constantly. While it is possible for use, it is best used as a short term runner or a track car that see extremely limited running time. Best bet, Advanced Auto/AutoZone, for a new V-8 rad.
A electric cooling fan and shroud is a nice (but expensive) move that will free up some good HP.

Not worried about the cost of cooling, it is a necessary evil for hp and HP. Ironically my car was a factory V8 car, I thought my rad was stock. I am looking at an 22" alu on ebay, wish it were cross flo tho...