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#11 | |
![]() Join Date: Dec 2020
Location: Sydney, Australia
Posts: 85
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Pepmeier Engines does custom tool steel cam blanks that are machined to your specification. |
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#12 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 164
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My '94 has custom Web-Cam camshafts designed by a previous owner.
I believe they're roughly the following @ 0.050 lift. Not sure on the LSA. (Edited per Todd's observations.) Intake: 238* duration, .435" lift. Exhaust: 221* duration, .432" lift. Idle: https://www.youtube.com/watch?v=YhmimYEVaQA Dyno: https://www.youtube.com/watch?v=H6PyzYl_LlE
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red Last edited by scorp508; 06-25-2024 at 03:11 PM. |
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#13 | |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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248 exhaust wouldn't be a reasonable duration @ .050" lift, but also too short for total duration. i'd be curious to see the cam card on those.
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#14 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 164
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This is what I have, no actual cam card.
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#15 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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As was said before, there are three ways I know of to do cams on the LT5.
1) regrinding stock cams. Several guys go this route, especially on a stock displacement engine. In this type, the base circle of the cam is ground smaller by, say .030" maybe more, which translates into more lift and ability to cut it with more duration. The concern here is taking up the added clearance to the bucket lifter... there is only so much travel. Can require a valve job to raise the stem height. 2) welded stock cams. Not as prevalent, although I think one of the tuners uses that method. Web cams is the typical provider of this service. I don't have any first hand experience with welded cams. 3) new cores. These are usually machined from billet, although there were a limited number of unfinished chill-cast iron OEM cores out there several years ago. I use billet steel cores, made from high quality tool steel. These are expensive, but can be tailored to any profile needed for the application. Todd
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#16 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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Cool. Thanks for posting that. Those all seem to be 238-239 ish duration at .050. That seems reasonable, although generally on 4-valve engines the exhaust duration would be significantly less than the intake duration.
.435 lift. I'm thinking these are welded cams, since you said Web Cams. Todd
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#17 | |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 164
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Last edited by scorp508; 06-25-2024 at 03:16 PM. |
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#18 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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#19 |
Join Date: Oct 2018
Location: Indiana
Posts: 47
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@scorp508 congrats sounds great and nice dyno numbers!
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#20 |
Join Date: Feb 2009
Location: Bartlett - IL
Posts: 14
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Don?t know anything about the specs, just a car I had filmed years ago.
https://www.facebook.com/share/r/xQC...ibextid=UalRPS |
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