Originally Posted by tylera189
what if you had a little bigger cam with a larger lobe sep like 108. Would that help it clear the 4inch rods. I was told it would help. my cam is .679/.645 and I am planning on a 434. it is a .900 base. Also its a 4/7 swap, would that make it harder or easier to clear a 434 rod. And I know you can send a cam back in to be re-ground. So would they change the specs all together, or would they be able to change the base circle to help make it clear, but leave the specs alone??
I have a little bigger spec cam than you are talking about, .689 in fact and will run 1.6 rockers on it, and i had Bullit grind me a 4/7 swap cam, but they ground it to .870 base to be sure the .900 will be close if not hit "H" beam rods. They can go as low as .850 base circle, there is another issue which comes up. You absolutely have to use vertical tie bar lifters with the small base circle cams. The horizonal tie bars will almost alway hit the lifter boss in the valley. In my 434" i have tall seat lifters that will not have this problem, also make sure you get the lifters that are made for small base circle cams. They have more clearance on the side struts where the roller is installed.
All just precautions
Zip.