Re: "Old School" Stocker Cams
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One is a stocker and they both have the same lift and duration.
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Is this a actual old stocker cam you show..another words those old cams had square lobes too? The cam in my 396/325 is square lobe..but has more duration built into it, right? Did they also change the LSA, lobe separation angle of the race cam compared to the stock cam too? More overlap for higher RPM? Thanks for the lesson! I think it makes more sense to me. Will Lamprecht 65 Imp... |
Re: "Old School" Stocker Cams
Maybe not more measured duration from open to close, but more "effective duration" due to opening the valve quicker and closing slower so that the valve is further off the seat for a longer period of time and thus allows more air to flow. "Area under the curve"
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It's hard to compare those specs to .."@ .050, today, because that term was not part of the mix. |
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Impstocker-you have a PM
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I’m not opposed to roller cams in stock and some cars already have them, NHRA has given everything else like a super stocker in stock and in my opinion there is no hp advantage or durability advantage. I also have never had a single valve train problem with my Hemi. It’s not the roller lifter that allows the working rpm range it’s the cam profile.
New billet steel cam $1000 , proper flat tappet lifter for said cam $850 , new set of push rods $400 , about the same price as the roller. If I’m going to upgrade from a cast cam I’d prefer the roller( not that we can have it). I’d also like to eventually run my cam/car through the traps at 85-8600 not so sure we will ever get there with the flat tappet stuff. 20+ years ago I wrote a letter to Nhra asking for roller cams , roller rockers , better springs, aftermarket rods , aftermarket brakes etc... with my opinion why we should do it. I never got an answer but eventually everything except the roller cams has come to pass. I get it Billy And Todd both like the little of what’s left , the purity of stock racing but it has moved so far away who really gives a **** anymore? $3500 stainless headers $6500 transmissions, $5000 torque converters ? Some stocker engines are approaching $30000. not much STOCK anymore for a long time now! This argument has been going on since 1987 when the cam rules changed and it has not gone backward since. |
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It's the hp factors thats the problem! |
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(does anybody on here even remember that?) |
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Sure was fun to read all this information from posts by real Class Racers!
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No we want to race our cars the way the stock rules were intended. We like stock, not super stock. For all you people that think your problems, reliability, and monetarily will be completely solved with allowing your combo to run a roller cam it won’t be. You will still be slow and break parts. Roller lifters break. Ask guys that race Super Stock. |
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Re: "Old School" Stocker Cams
The mind is a terrible thing. Of course I meant the 15 year rule that was put in place to remove all of the 55-57 Chevys from Stock Eliminator.
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Try again ! d |
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I don't have a dog in this fight, but roller cams in Stock, really?? Getting kinda ridiculous.
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D |
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Then race a car built "from the 90's on".
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I don't know if its old school enough but a Lunati 930b 390/410 h was the best sounding cam I ever had. Seemed to run real good in good air but fell off a lot when it got hot Rick.
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Re: "Old School" Stocker Cams
Was that a '68 327/250 horse combo? Mine does that. I've used Lunati and Bullet cams in them as well.
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It was a 71 350/270/278 hp Isa camaro.
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However, I graduate High School in mid 60's. Also ( As my X Wife would explain to you ) = I am generally wrong all the time! |
Re: "Old School" Stocker Cams
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I dug up some old data. This is the lifter raise for a Lunati sticker cam for a 302 Z28 from the mid '70s.Let me add that by the time I got to check the cam it was used.
Stan |
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I remember we put what was called a 7000 plus Cheater cam in a 1868 Dart GTS 340. This was around 1975. Best camshaft way back that I had was a G K that McElroy had something to do with. That was around 1980.
Had Rhodes lifters and 273 adjustable rocker arms. With some pencil neck pushrods compared to todays. Those good old days when tuning was an art and records were set. Paul Haszlauer |
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And Gapp and Roush. I herd that he was working for Roush after he closed his shop.
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I can say,I have ran under the old style rules spring pressure and lift, duration and overlap and it having to check.... and I have and do run under current rules....
I would pick current rules on cam,lifters and springs...been there done the stock pressure spring,which was checked...and duration overlap.... my IHRA pure stock combo 305/160/230 ABSOLUTELY ate springs and valves and it LOVED the taste of them... if nothing went wrong about 35-50 runs heads were coming off for valve job, valves and springs.... present rule stocker... I have one right now in D3 with 3 seasons on engine and same springs... had one with 500 runs on cam and lifters...had 300+repeatedly I will take current rules on springs... however if I built another stocker it would be a roller cam car... no other reason than eliminating cam break in... |
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Any of the Mopar 340 guys ever run either of these cams? I think the Lunati is from the 1990s, GK maybe the 1970s?
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