Magnum 360 heads "best" for my build?
64physhy Good link! I forgot about those. Nice system.
I am not "sold" on this cam, but it does seem like a good compromise in power with mild lift. Not sure if I wll run 1.6 or 1.5 ratio rockers yet... I am open to other cam choices, comp suggested a custom grind, waiting to hear back from them as to why they suggest it over the 20-223-3 XE268H, here are the specs they sent me:
265/273 adv dur (@ .006)
216/224 dur @ .050
.3170/.3170 lobe lift
.4755 valve lift with 1.5s
.5072 valve lift with 1.6s
110 LSA
-install dot to dot for a 106 IC (4 deg adv ground in)
Would love to know what the logic in suggesting this cam is...
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 run a very similar Crane cam in my 318 with 3.21 gears and a small tire. (I need to refresh my memory on it's exact size. I think there 225/70/14, about the same diameter as your wider tires.
It's a preety good combo.
(Crane specs; 216/228-.454/.480/112)
With a Magnum head, your ratio for the rockers start at 1.6 and the 1.7 is the extra lift arm.
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.
The exhaust manifolds are a restriction now matter what exhaust manifolds you have. Period.
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.
(Edit, I also agree with Moper.)