Subject says it all. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

This term is usually used incorrectly, it indicates .750" lift camshaft. I think there is even a company that is called 3/4 race cams, only im sure they sell mostly cams that dont come close to that much lift. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

Josh...

You are really showing your age!

I haven't heard that term used since I was a kid. And that was a long long time ago.

I always wanted the "Full Race Cam"! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

There is a guy saying he has a 3/4 race cam in his SBC. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> I thought it was just slang. As for .750 isn't that just 3/4 of an inch? <img src="http://www.click-smilie.de/sammlung/fragend/fragend013.gif" alt=" - " />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kimchee and Rice:
<strong>Josh...

You are really showing your age!

I haven't heard that term used since I was a kid. And that was a long long time ago.

I always wanted the "Full Race Cam"! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I not that young. I am just having some fun. So a full race cam is what? 270/270/1.000/1.000/111lsa
I mean if .750 is 3/4 race 1.000 is full race.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Toxic Texan:
<strong>There is a guy saying he has a 3/4 race cam in his SBC. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" /> I thought it was just slang. As for .750 isn't that just 3/4 of an inch? <img src="http://www.click-smilie.de/sammlung/fragend/fragend013.gif" alt=" - " /></strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Correct .750" is 3/4 of an inch, i have a cam in my 68 Chevy II that has these specs: .750"int. lift .690"exh. lift 285*at .050" and 292* exh. duration on a 108* LSA

<small>[ October 23, 2002, 05:19 PM: Message edited by: LS1derfull ]</small>

 

<img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Damn when you start that chevy II does the bumper fall off. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

 

Hey c'mon "PRO"fessor Full I heard U had a 7/8th cam in that badass chevy 2 ! <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" />

 

Is it a Wolverine cam. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

The true meaning of 3/4 race cam goes all the way back to flat head fords. You had stock cams, slighty over stock cams, 3/4 race cam which was the 2nd biggest and then you had the race cam. There wasn't alot of manufactures back then and thats how it got started. It carried on through many years but as cam technology came around, there were too many grinds to consider so its kinda faded away.

 

This is a good thread. Since I still have the stock cam in, can I tell people I have a 1/2 race cam? It's close to .500. That would be cool <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> I have a 226/.570 cam that will go in this next month. What will I tell people then?

 

I remember the "Duntov 30 30" cam for the very early Corvette SB engines. Think it was the original "Fuelie" cam.

Never did really understand the "thirty thirty" though?
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

I always thought the 3/4 meant the duration ( 270 degrees). I have never heard anyone say for sure what it means. All I know is the old racers are the ones who say it. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Y2K Blackbird:
<strong>The true meaning of 3/4 race cam goes all the way back to flat head fords. You had stock cams, slighty over stock cams, 3/4 race cam which was the 2nd biggest and then you had the race cam. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thank you. I've listened to endless drivel from my father, who lived the Detroit, '60s Chrysler Hemi race crapola. He worked at CAAP, JAP, and Lynch Rd during those days. That term just describes relative cam spec of the day. It's entirely inappropriate in today's world.

Then, "Street Hemis" were barely servicable, poor performing beasts. On the street 428SCJs and LS6/ZL1s ran them down like dogs. Street Hemis only had a rep because the KBs of the world were completely rebuilding them to be competetive.

SC-

<small>[ October 23, 2002, 07:05 PM: Message edited by: SS00Blue ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kimchee and Rice:
<strong>I remember the "Duntov 30 30" cam for the very early Corvette SB engines. Think it was the original "Fuelie" cam.

Never did really understand the "thirty thirty" though?
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You set valve lash at thirty !!!! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Agave...

Ok, that makes sense now. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

30 thou on those solid lifters. No wonder thay clattered so much!

 

a 3/4 cam is a very old term but it has nothing to do with lift. it is 285 degree duration type cam usually measured at .006 lift or basicly, the valve is open 3/4 of the time. this was a popular cam for manufatures because it gained good power in almost every engine and usually gave a range of 1600 to 6000 rpms. funny thing is, is that it still works. this would be similar to a .224 to .232 duration cam measured at .050 lift on LS1s. plenty of people are using these durations now and are still makeing good power. of coarse, the lobes are state of the art now but the acually duration has stayed the same over the years. just dont go around saying you got a 3/4 cam. some people will laugh.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by AgaveCorvette:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kimchee and Rice:
<strong>I remember the "Duntov 30 30" cam for the very early Corvette SB engines. Think it was the original "Fuelie" cam.

Never did really understand the "thirty thirty" though?
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You set valve lash at thirty !!!! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">whats valve lash?? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Drew

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kimchee and Rice:
<strong>I remember the "Duntov 30 30" cam for the very early Corvette SB engines. Think it was the original "Fuelie" cam.

Never did really understand the "thirty thirty" though?
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">There was one GM street mechanical cam(3849346) in the mid 60's that did call for .030/.030 lash. It had 283/283 duration at the lash point (less at .050 of course) and .447/.447 lift. with a LCA about 114.5 deg.

 

3/4 race cam!! haven't heard that one in a while, what about "four barrels kicked in" or "cought posi"
he-he
Ed

<small>[ October 24, 2002, 08:05 AM: Message edited by: Ed Potter @ LPE ]</small>