Gidday guys. Just about finished my motor with a lot of help from yous. I was copying one of my old mans motors as I loved the way it moved. Unfortunately i didnt fully strip it before i started buying. Block is 350 30 over, decked .020, 2.02/1.6 63cc 170cc runners, rpm manifold, 750 vac sec downleg boosters, hei, nice set of headers, 3.9 gears and turbo 350 with 2500 stall. Now, i finally pulled his cam out, it was a isky 270 mega cam hyd. What will the difference be with me using the xe274 over this cam, loss/gain, advantage /disadvantage. Also noticed while pulling the rockers off they had some lash. Took lifters out and noticed they were infact solid. So now I am unknown to what the valve lash was set at. Its common practise over here to use solid lifters with the hydraulic cam so going to take the route myself. If I can work out what my valve last should be. Must have been reasonably tight as it wasnt loud like the other solid cammed motor he has. His block had only had a skim and was using .200 longer pushrods. I will try use .100 longer as my blocks decked a bit more and have higher lift and 1.6 roller rockers. I take it this will work. Any help on the valve lash is appreciated..
Oh you going to be like that. I have my cam. Im not going to buy anothr cam. I was trying to copy this motor as it was more than enough power for me. I was just asking if anyone would know how to find the lash. Im not aftre a solid cam design, i am building it as i said and if you cant help please dont write. If I cant work it out I will have to use hyd lifters as I arent going to start playing trial and error.I was just trying to build a nicely warmed up basic 350 and just adding a few things to make slight gains, (downleg instead of straight leg holley, 1.6 rockers longer pushrods, lifters etc, was hoping all these things would add up to 15-20 hp gain, nothing wrong with trying something different you know,. No need to insult people because they dont do what you would do.. It may not be recomended to use solids on hydaulic cams but is doing and with success, the other way round I wouldnt attempt it because of the ramp rates..
It is common here to in restricted circle track engines BUT it is not good practice for a hotrod.The reason being is hyd. cams do not have the lash ramps ground into them designed to meet the valves and rockers gently. The hyd cams are designed with the rockers already in constant contact with the valves and the take up ramps aren't needed.
So it shouldnt be that noticeable gain anyway, i read maybe like extra 500 revs uptop... i knew there must be a reason why they do it, as quite a few motors over here have been set up like that. So if there is no gains to be made, will I gain any lift by using the longer pushrods
how about the anti-pump lifters with the xe274, or would i lose power compared to normal hyd lifters.. will thexe274 match the 270megacam? i dont want to be throwing away power when i dont have to
how about the anti-pump lifters with the xe274, or would i lose power compared to normal hyd lifters.. will thexe274 match the 270megacam? i dont want to be throwing away power when i dont have to
Use a good hydraulic lifter w/internal "C"-clips (not the wire retainers) that are used to retain the p-rod cup in the lifter body.
Zero lash them (no pump-up if the valves were to bounce, float or the lifter leave the nose of the cam at high rpm), and you'll be fine, IMO.
BTW, there may be good lifters that'll zero lash w/o any drama that do use wire retainers, check w/the manufacturers and see if any will commit to being dependable if zero lashed. I doubt they will, but you could ask.
Barring that, you might have to ask around.
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