Rockers ratio poll

[Nacho-RT74]

as many of you knows my building ( very delayed by the way ) will be


-Magnum 400 engine standart bore sleeved ( 25K miles on it, so will be just honed )
-KB240 pistons
-850cfm stock TQ carb
-MP 280/474  camshaft ( resto HiPo cam as back up )
-166K TC ( 175K TC to arrive someday as backup )
-basic 2186 eddy intake
-452 heads ported and milled ( dunno how much yet, will be defined when pistons are measured in the holes )
-stock HiPo exhauts manifolds
-exhaust pipes already upgraded to 2.5"
-Summit double timming chain setup
-3.55 SG axle
-27" wheels
-Hughes springs (120lbs at stock installed height, can't recall the PN) with Lunati 75713 retainers
-Stock valves
-Metallic headgasket
-stock pushrods

after some calculations made at Moparts got:
Stock Hp Mopar resto camshaft with .450/.458 will convert in to:

.450/1.5=.300x1.6=.480
.458/1.5=.3053x1.6=.48853

new resto cam will be:
268/284 dur with .480/.48853 lift

and the 474 MP cam

.474/1.5=316x1.6=.5056

new 474 cam will be:
280 dur with .5056 lift

what rockers ratio would you get

( Note: working A/C  is mandatory  )

[oldschool]

for that motor,1.5,s. they would be very reliable....

[Purple440]

How do you determine which ratio to go with?  I've read some posts on it but I don't understand it.

Nacho - not sure if you've seen my posts on my detonation problems, but be careful with those 452's and your C/R. 

[firefighter3931]

for that motor,1.5,s. they would be very reliable....

I agree....go with the 1.5's for reliability/longevity. 



Ron

[Nacho-RT74]

1.5 are already on the way this morning.





which one is the thread Purple440 ? 

( funny I'm asking about that on moparts LOL )