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flyboy | 113 heads valve lift question | ||
Elite Guru
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I have read on numerous other threads during a google search that .470 is the max. valve lift on stock 113 heads or there will be retainer/seal clearance issues. That the valve guides must be machined to go any higher. I spoke with the machinist at TPIS. He said he had a set of stock 113's with fel-pro seals and that he would run a check for me. He called back and said they were good to .525" lift. Does anyone out there have any knowledge on this? Thanks.
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Posted on: 2009/11/1 23:57
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sliding | Re: 113 heads valve lift question | ||
Senior Guru
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I know that when I installed #219 cam with stock 1.5 rockers I didn't have enough space. That combo is .525" lift. I was using positive style teflon seals. I have #113 heads dissasembled right now, so if you want I could measure from top of the guide to the bottom of the retainer. But you would have to add valve seals that you'll use to that equation
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Posted on: 2009/11/2 14:19
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'90 L98 auto with a lot of mods |
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flyboy | Re: 113 heads valve lift question | ||
Elite Guru
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Thanks, I would appreciate that info. How did you rectify that problem, +.050" valve locks, pehaps?
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Posted on: 2009/11/2 15:34
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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Matatk | Re: 113 heads valve lift question | ||
Webmaster
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I know some guys have run the LT4 hotcam along with springs in the stock 113s. Here's an old thread from CF, check out post #10.
http://forums.corvetteforum.com/c4-te ... 113-casting-max-lift.html |
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Posted on: 2009/11/2 20:29
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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flyboy | Re: 113 heads valve lift question | ||
Elite Guru
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Thanks, Mat. That's what I like about CF. Ask a question and you get nine opinions about something else before someone actually tries to answer the question.
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Posted on: 2009/11/2 20:53
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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vetteoz | Re: 113 heads valve lift question | ||
Senior Guru
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Quote:
Matatk wrote: LT4 / ZZ4 spring worked for me ; under $40 set http://paceperformance.com/index.asp? ... ion=VIEWPROD&ProdID=24732 $20 for the lightweight LT4 retainers http://paceperformance.com/index.asp? ... ion=VIEWPROD&ProdID=22758 Quote:
A little knowledge is a dangerous thing |
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Posted on: 2009/11/2 21:48
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sliding | Re: 113 heads valve lift question | ||
Senior Guru
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Sorry, I didn't have time to measure, I'll get back to you with that info.
I solved my problem by machining (cutting the top) the valve guides. But when I installed my cam, I also added new double springs and retainers that are (if I remember right) thicker than stock retainers. I'll measure the spacing on the stock components for you tomorrow. |
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Posted on: 2009/11/3 21:23
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'90 L98 auto with a lot of mods |
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flyboy | Re: 113 heads valve lift question | ||
Elite Guru
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Thanks. The tech guy at Scoggin-Dickey Chev. also affirmed a .525 lift on the stock 113's. Hopefully these guys are more commited to giving accurate info. than just making sales.
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Posted on: 2009/11/4 2:00
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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sliding | Re: 113 heads valve lift question | ||
Senior Guru
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Here is what I measured at stock head. But I can't tell if this head (valves and seats) has been machined before what could give greater readings.
I've also measured on one exhaust valve and reading was .671" Hope this helps you! |
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Posted on: 2009/11/4 14:26
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'90 L98 auto with a lot of mods |
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flyboy | Re: 113 heads valve lift question | ||
Elite Guru
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Thank you.
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Posted on: 2009/11/4 23:57
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'91coupe, LT4Hotcam, some other stuff. If it's too loud, you're too old. "He works on old cars, then junks 'em" |
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