Crazy question I never have pushed on rockers after engine has sat a few days and I can push down on all lifters real easy with fingers even after starting it not sure what might be going on ?
Rhoades are anti pump up/bleed down lifters........they are made to not be fully bumped up at lower rpms, this shortendvthe lift and duration to make the car idle and drive better............but when running rpms there isn't enough time to bleed down so the cam performs closer to spec. So yes when the engine is off and there is 0 oil pressure they will bleed off and have a touch of play in them Totally normal for rhoades lifters
Pressure gauge says 80 lbs oil comes out of rocker shafts so what is a touch of play ? Seems I can push them down till they bottom out after they sit awhile when I check them right after I shut it down most are tight and a couple on each head I can move on rocker shaft if the lobe is not opening the valve and the ticking noise is annoying. How much lift can cam have and not use those lifters. I have a set with lifter cup further down but they are melling lifters the cam is a Kenne Bell MK3 with adjustable pushrods
Is this a street car that needs the extra vacuum to have smooth idea.......if not there is not much need for them. I know some ppl use the to run a bigger than allowed cam in class racing. You still need to have proper pushrod lengths. I ran and still have a set........not in my race motor.........never had any issues with them
Has nothing to do with lift. It's the duration that matters when it comes to overlap, low vacuum, and rough idle. The Rhoads lifters bleed down at idle reducing the duration so you have more vacuum and smoother idle. Then they pump up at higher RPM delivering full duration. If you want a cam recommendation, you'll have to provide more information like your static compression ratio and exactly what you expect from the engine and how the car will be used.
I have a KB MK 3 In it now and seems ok so far seems ok and compression is 9-1 and decked almost zero piston is 009 in the hole
The only specs I have are for the KB MK3H. It is 252*/252* on a 106* LSA. That's pretty big and would be a good candidate for Rhoads lifters.
Like I said be wary of low oil pressure.....the cars I've seen them with have very low idle oil pressure. One motor had 5-10 at HOT idle and 25-30 after putting stock lifters back in. But I guess if it goes up to 60-80 when revving HOT it's ok. Sounds horrible at low speeds as well.
I put adjustable pushrods in and it smoothed thing out some still is noise at idle at 20 lbs pressure. I have a lunati sp1228 cam but dont know what specs are was thinking of trying that one come spring
Probably SP1 cam. Lunati 33302? This is an old catalog from Buick1. They used to sell a variety of Buick cams,