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#1
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Lifter Resurfacing
With all the concerns about HFT lifter & cam failures I decided to purchase a set of slightly used GM lifters from the 80’s or 90’s for a really good price. The story was that they were used for 5 dyno pulls then swapped out for a roller cam. All the lifters do look like they were only used for a few pulls, two or three have some marks on the face that I can’t feel with my fingernail, pic is below. Regardless my plan was to have them resurfaced so before I pick a place randomly I figured I’d ask the group if there’s a place that you know of that will do the resurfacing?
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#2
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Camcraft cams
Egge Machine https://mizpahprecision.com/pricing.htm qppcams I believe Schneider racing cams resurfaces lifter also. |
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#3
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Paul Carter
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
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#4
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Carter could cryo the lifters too.
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#5
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#6
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Hopefully not off track.
But with things the way they are today, would this be a 'blueprint' operation to consider? Most know how this works. You have pistons in hand before final hone. You have main bearings in place and measured before grinding crank. You get the idea. Disclaimer. I dont have a lot of real world experience, but being a machinist I think about this shtuff. For sake of discussion lets assume we have good quality parts and machine work is accurate. Numbers/design are just for theory only. So picture this. We have a lifter on cam. Left side of lifter is in line with cam lobe. Cam lobe tapers .010 down to right. Lifter has crown of .005 You guys with parts in hand could give an idea on real world numbers. So now we have cam company A that has these dimensions. Now some prefer to mix and match companys. So company B's lifters have .003 crown. Installed on A's cam you lose .002. Would this be a case where one would want to have the cam in hand and grind lifters to 'match'? I know brand and breed of engine design comes into play. And level of build also. IE. Backyard build vs. Nascar build. Whats your experience or opinion on the matter? |
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#7
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I've always thought of it like setting up a ring and pinion. The 'pattern' of where the lifter rides on the lobe isn't going change appreciably based on it's crown alone. The taper on the cam would have a more significant role? Dunno.
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#8
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that is a good question. how about add to the fact a cam can be given to some companies who can build up the specs to what you want by adding material!?
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane |
#9
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__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
The Following User Says Thank You to 77 TRASHCAN For This Useful Post: | ||
#10
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Oregon Cams regrinds lifters also. You have disassemble them and only send the lifter body. They advise to keep the internal parts together and don’t mix and match on reassembly.
Price is pretty reasonable.
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
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#11
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Quote:
Lifter face radius question https://www.speed-talk.com/forum/viewtopic.php?t=46101 Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#12
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If those lifters were mine, I'd verify that they still have some crown. If they do, I'd pull 'em apart ONE AT A TIME for cleaning and inspection of the guts.
Assuming they look OK inside, I'd put a piece of exceedingly-fine sandpaper (1000 grit?) in the palm of my hand or on some firm closed-cell foam like a better-style water-ski life vest, twist the lifter foot against the sandpaper for about two seconds, wipe 'em off with a soft cloth perhaps with some solvent. |
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#13
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I'd love to see any HFT cam, and any set of lifters sent to "someone" who could positively put proper matching lobe taper and lifter crown on the items, then install in engine and see how it goes.
Don't know of anyone that would do this sort of thing ... but I'd bet if the parts were decent quality to begin with, that it would break-in and run beautifully.
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I'm World's Best Hyperbolist !! |
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#14
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David Vizard recommended figure eights, but his approach was more aggressive
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#15
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Quote:
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
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#16
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My thanks to Stan for posting his link to SpeedTalk. Very interesting and that link had a link within it to EngineBuilder which was quite helpful. Below are links to the two sites mentioned. Thank you Stan.
https://www.speed-talk.com/forum/viewtopic.php?t=46101 https://www.enginebuildermag.com/200...owned-lifters/
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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