[Barry_R]

I generally use Comp for cams. The lobe library is pretty good, and certainly covers the range of needs for the vast majority of builds.

Although I get arguments about it, few if any race teams outside of F1, NASCAR or Pro Stock will ever be able to quantify a two degree or .010 difference in cam performance. I know that you would need to test numerous cams on dyno and in car in order to determine any real advantages. Unless you have a budget to accomodate such testing, close and rational is what you need for a cam pick.

I also use Morel for hydraulic roller lifters, having had better luck with them than others. Even so, I normally see them lose valvetrain control somewhere around 6000-6200 RPM unless some tricks are employed. You can readily see the onset of control loss on the dyno as an abrupt drop in torque - you can usually hear it as well.

Rick is enamoured with high oil pressure - an opinion which I do not share. Even so, there are many ways to success and nobody has "all the answers".

On a hydraulic roller we will normally use the T&D street rockers. We recently signed on as a Harland Sharp distributor as well - and they also offer a full roller system that - while expensive - looks pretty nice as well. The Erson parts were indeed good value, but after being purchased by PBM they decided to exit the rocker arm business for financial reasons - they remain in business for cams and such.

On larger engines I generally prefer the larger carbs - when set up with the Ford progressive linkage they are very responsive and will give more power upstairs.

The smaller stroke will probably feel a bit more reactive to up & down throttle inputs on a road course, and the reduced torque might be easier to drive further into the throttle. But at 6000 RPM or under there are no physical reasons to avoid the 4.250 stroke - either will be plenty durable.