Hydraulic to solid lifter swap
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Hydraulic to solid lifter swap
I have what would be basically a 72 police interceptor 460 in my 86 F250HD. The cam is of a street version hydraulic lifter. I am considering swapping out the hydraulics to solids.
The tech at Comp Cams said you can do this (they don't tell many about it he said) as long as you have an adjustable valve train. I already have 351c 1.73 roller rockers and had to go with 351 studs because they are slightly longer than the 460 studs which were needed to gain several more threads for the adjuster nut to hold onto.
I have found where the early (70/71) Boss 429 ran a mechanical camshaft (# DOAZ-6250-D) simular to the cam I'm running. Any thoughts on this swap and/or precautions one could think of?
The tech at Comp Cams said you can do this (they don't tell many about it he said) as long as you have an adjustable valve train. I already have 351c 1.73 roller rockers and had to go with 351 studs because they are slightly longer than the 460 studs which were needed to gain several more threads for the adjuster nut to hold onto.
I have found where the early (70/71) Boss 429 ran a mechanical camshaft (# DOAZ-6250-D) simular to the cam I'm running. Any thoughts on this swap and/or precautions one could think of?
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From: Indiana
I have to ask why? Solid lifters are normally used in high rpm engines. Are you planning on running over 5500 rpm or so? If not, then there is little benefit to solids, plus the hassle of adjustment.
But, if you want to do it, I don't see anything special required, since you already have an adjustable valve train.
But, if you want to do it, I don't see anything special required, since you already have an adjustable valve train.
Post Fiend
Joined: Jan 2003
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From: Iowa
I'd advise against it. You'll lose performance, because the hydraulics are run at zero lash, whereas the solids have a recommended lash. Given the same cam, the hydraulic lifters will keep the valves open slightly longer, and open them slightly farther, than the solid lifters.
Another issue is the oil. I know on FE's at least, that you have to block oil to the lifters so that you can keep oil pressure when you convert a hydraulic lifter block to solid lifters. I dont know if you have to do anything special on 460's or not. I think you would, since you have pressurized oil to the hydraulic lifters.
Another issue is the oil. I know on FE's at least, that you have to block oil to the lifters so that you can keep oil pressure when you convert a hydraulic lifter block to solid lifters. I dont know if you have to do anything special on 460's or not. I think you would, since you have pressurized oil to the hydraulic lifters.
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A stronger hydraulic lifter was required for the cam than is available from the manufacturer.
Because of the lifter companies difficulty of lately the hydraulic lifter needed is back ordered for 24 months.
With this lighter lifter I have had to go back in twice and replace several lifters that didn't work out, they would bleed off overnight and rattle terriblely on start up.
I set them at 1/3 turn from 0 lash, primmed them by turning the motor without spark plugs until oil is at the rocker arms and good break ins.
Because of the lifter companies difficulty of lately the hydraulic lifter needed is back ordered for 24 months.
With this lighter lifter I have had to go back in twice and replace several lifters that didn't work out, they would bleed off overnight and rattle terriblely on start up.
I set them at 1/3 turn from 0 lash, primmed them by turning the motor without spark plugs until oil is at the rocker arms and good break ins.
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Reply to rusty70f100:
As far as performance I"m think'en the difference wouldn't really be noticable, were only talken a thousands or so for lose in valve train slop.
Your second point of oil is what I was somewhat concerned with as I have heard the same thing about the FE's oiling.
My other concern is putting new lifters on an all-ready broke in cam. I've heard a new cam requires new lifters and I believe one can put new lifters on a used cam but never visa versa, any truth to this?
As far as performance I"m think'en the difference wouldn't really be noticable, were only talken a thousands or so for lose in valve train slop.
Your second point of oil is what I was somewhat concerned with as I have heard the same thing about the FE's oiling.
My other concern is putting new lifters on an all-ready broke in cam. I've heard a new cam requires new lifters and I believe one can put new lifters on a used cam but never visa versa, any truth to this?
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