Mine
(at .050) 248/252/596/605 1.72:1 rocker for that lift
(adv) 284/289/596/605
in my hemi 6 250 Lb/inch double spring
I used offset steel retainers from comp cams, 7* for steel, to fit in the springs, limited space, and multifit collets
they have mopar sized outside diameter and any inside diameter or config to fit with your valves.
i expected a motor that went well from about 2500 rpm
and it does....
it was doughy in the 800-1500 rpm range until i stuck webers on.
To make this cam work in my motor, i had to get a static CR of 10.5:1, and get my dizzy mechanical advance reduced to run 10 initial and 28 total.
originally my dizzy made 34* total with 6 initial i.e it added 28 * measured at the balancer. too much.
I tend to run V power but other than cost it goes well.
The cam grinder said it would be quite horrible if i left the static CR at its previous standard 9.5:1 which actually turned out to be about 8:1.
becasue i got lots of general advice pointing me in the correct direction, But also a wide range of views on how to achieve a nice running engine, that came mainly from people who knew lots about v8s. Or knew lots about 2 litre 4 cylinders. I felt i had to be careful as neither group were dealing with a motor that had a rod ratio like mine.
That was a worry, so......
I used this
http://www.wallaceracing.com/dynamic-cr.php
and this explanation
http://cochise.uia.net/pkelley2/DynamicCR.html
and then used the software at the bottom of the explanation to check i got more or less the same as outcome as the wallaceracing online calculator
a few abortive attempts when i got a few numbers wrong and all was well.
that way based on my rod length bore stroke and static CR i could get a cam that landed me towards the top end of the range between a Dynamic CR of 7.5 and 8.5
and what i found was most all of the advice given generally landed me in that area anyway but now i had a better understanding of why
It was nice to check.
if my DCR had been higher like 10:1 i would have built a pinging grenade
if it had been low like 4 or 5 to one i'd have built an expensive slug.
both advice and software served me well and helped me to avoid making a motor that was less useful than the one i pulled out.
Dave
their cam
