I would call Smith Brothers and get a shorter set of pushrods made.
www.pushrods.net
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| Lifter pre-load for hydraulic cams https://www.slantsix.org/forum/viewtopic.php?t=18874 |
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| Author: | RMDV [ Fri Jul 28, 2006 1:23 pm ] |
| Post subject: | Lifter pre-load for hydraulic cams |
I'm putting together an '83 225 out of a Dodge pickup for my '63 Valiant. The engine was originally equipped with a hydraulic cam and lifters which I have replaced with a Comp Cams 64-246-4, grind CR6 252H10 and their hyd lifters and new springs. The instructions with the cam explains how to determine the amount of pre-load on the lifters and how to compensate if it isn't correct. The rockers are non-adjustable, the pre-load turned out to be ~.100" using the method described in the pamphlet. This seems to imply that I have to shim the rocker shaft ~.070" to get the desired pre-load of .030" recommended by Comp. I called Comp and was advised to try what I have alluded to above, but since this is the first time I have tried this, I wanted to get other opinions. This is my first re-build on an engine with non-adjustable rockers. The rockers are new, but the push rods are the original ones furnished with the stock cam from the factory. Thanx for your help and consideration. RMDV. |
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| Author: | slantzilla [ Fri Jul 28, 2006 1:36 pm ] |
| Post subject: | |
I would call Smith Brothers and get a shorter set of pushrods made. www.pushrods.net |
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| Author: | 1sexy6 [ Fri Jul 28, 2006 5:07 pm ] |
| Post subject: | |
I had "very" bad luck with rocker shaft shims. I used a clifford hydraulic cam and milled the head .100". I had to use 3 .030" shims under the rocker shaft. Stupid me snugged the shaft down too tight and cracked a few of the rocker shaft perches  The shims didn't fit together very well, and figured they would "squash" a little. The top edges of the shims ended up narrower then the rocker shaft and "spread" the perches apart. I didn't over do it by any means (I managed to do that with a normal box end wrench).... Anyways where I am going with this is if you end up using multiple shims make sure you trim them to fit proper!!!
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| Author: | RMDV [ Sun Aug 06, 2006 9:58 am ] |
| Post subject: | Re: Lifter pre=load etc |
Hey Slantzilla, Good call. I called Smith Brothers and they are making a new set of push rods for me that will accomodate the proper valve train geometry. Thanx for the help. And I was comforted to find I had measured the pre-load properly. Those guys were a great help. Hopefully I will have the 'ol Valiant back in the stop light derby. Regards. RMDV. |
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| Author: | 75duster [ Sun Aug 06, 2006 2:48 pm ] |
| Post subject: | |
why not just use the rockers off of a mechanical cam motor? that way you can manually set the preload |
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| Author: | mopar_nocar [ Sun Aug 06, 2006 3:02 pm ] |
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most parts stores will have a list of pushrods....all machine shops worthy of the name will. stock length is 10.009" get a 5/16 ball/ball push rod that is 9.900" and be done with it....i spent $1.50 each on mine. what is smith bros gonna charge you? or buy a new set, use a tubing cutter and make your own. just thinking out loud here. sb |
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| Author: | Joshie225 [ Sun Aug 06, 2006 4:47 pm ] |
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Quote: why not just use the rockers off of a mechanical cam motor? that way you can manually set the preload
Because then he won't have oil to the lifters. There is no lifter oil galley on a slant so the hyd lifters get their oil through the valve gear and down the pushrods.
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| Author: | 75duster [ Mon Aug 07, 2006 8:11 am ] |
| Post subject: | |
yea i remembered that last night |
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