Tell us about the rest of the engine and vehicle combination.
What was the old cam duration vs new? Lobe separation old vs new?
Was the cam the only thing you changed?
I just recently received my CS XR280 R-10 and called Comp with your same concern, they said: "if the open spring pressure at max lift is less than 500lbs, its not a problem". I went with 110 lob sep due to the weight of my truck.
So 65Guera if idle quality is not a concern consider the XR274R (or brand XXXX with similar advertised numbers) ground on a 108 or even a 106 lob sep to help wake it up.
But the best advice is probably right in your own back yard: http://www.joeshermanracing.com/
Yesterday 11:58 PM
I checked out the Link....This guys is right down the street from me...I am going to call him tomorrow and I hope he can help me decide what to do...
As far as what I have...its a
1965 El Camino
I have a 357 SBC .40 over
Lunati roller cam and lifters Part#50157 248 duration @ .050...555 lift 110 LOB
Roller rockers 1.6
Dart 215 pro1 aluminum heads
MSD ready to run dist and 6AL ignition box
373 rear gears
The idle quality i have with the current cam is good...
its smooth not to rough..I have enough vacuum for brakes...
and it goes like a bat out H.ll down the freeway...But out and about on the street kinda feels like it needs more power....When I had this thing chassis Dyno'd it only output 300RWHP..I was hoping that it would be in the 400 - 450 range.....