View Full Version : Valvetrain weight concerns with Caddy lifters

06-16-2007, 01:18 PM
Not sure if this belongs in Advanced or regular, but I'll start here and someone can relocate it if it's inappropriate :)

I've read a little somewhere about the Caddy racing lifters supporting a much lighter valvetrain in the endurance motors. Will the increased valvetrain mass cause longevity problems in a street/autox/road race vehicle unless I use hollow unobtainium valvetrain components instead of typical valves, dual springs, pushrods, etc?

Also, do we have specs on how much open/close spring pressure as well as lobe lift these Caddy lifters will control?

06-17-2007, 09:48 PM
I was under the impression that the Caddy lifters were lighter than the conventional pieces, though I never could find the actual weights.


06-17-2007, 09:50 PM
I think hes asking since they used the caddy lifter in engines with a light valvetrain if they will still perform in a street car with a heavier valvetrain.

06-17-2007, 10:22 PM
the caddy lifters are fine. just dont spin it to 8500 on a heavier valvetrain. your setup will determine how long they last, which, im sure is a long while.

06-18-2007, 04:29 PM
The tech department is a little out of my realm but. The spring adds the load on the lifter, that's the resistence. So what is the spring pressure on the caddy lifter - ls6 spring ie: light. The reason for a light valvetrain is so the ls6 spring can handle higher rpms and last 100k+. A heavy valvetrain isn't the worst thing you just need enough spring to control it at a given rpm. vavlefloat...... (also spring maybe lifter life)

06-18-2007, 04:43 PM
Where you want to try to save the most weight in a valvetrain is on the spring side of the rocker fulcrum. Lifter weight and pushrod weight has a little effect on your valvetrain dynamics. The biggest reason why you see light pushroads in some racing is that they are trying to achieve a "spring board" effect from them and actually storing energy in the pushrod.

Lighter is still better on that side, but for the sake of durablity sometimes not worth it.

06-20-2007, 09:10 AM
The lightweight lifter is not the assembly itself. The magic is inside. If you need more info, contact me.

06-29-2007, 08:21 PM
The lightweight lifter is not the assembly itself. The magic is inside. If you need more info, contact me. I have spoken with SDPC recently about ordering a set of these for my motor. I have had some issues recently w/my Futral cam and it's questionable heat treat (Or lack thereof!) and since I had to buy a new cam, as one lobe was scored, I figured that with 30,000 miles on a Hi-Po motor, I should replace the lifters also. I did not see any unusual wear on any of the lifters, but they are stock hydraulic rollers and figured that, if nothing else, these new "Caddy" lifters might provide a little over-rev insurance, and maybe a few extra ponies over 6200 R's or so. SDPC quoted a $225.00 price for 16 of them. Pace in Ohio has stock replacements (OEM), like I have been using, for $118.00, which sounds awful cheap for even the stock pieces. You said to ask about these new Caddy lifters, so here I am!! Thanks in advance. :drive:

07-01-2007, 03:38 PM
The lightweight lifter is not the assembly itself. The magic is inside. If you need more info, contact me.
You have a PM.

How about the pushrod wall thickness and diameter? Will 3/8 x .08 be sufficient for a 145/390 dual spring? Should I use the recommended preload of .060 for the Caddy lifters? I read reducing the preload will help...