Comp Cams 268H...anyone have this?
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Comp Cams 268H...anyone have this?
Installed this cam into my '81 rebuild...and now wondering what in the world I was thinking...
Anyone have this cam and driving it on the steet? In what engine? What base timing are you using?
Comp Cams state a 1500 - 5500 RPM range....is this going to work on the street?....what was I thinking
Anyone have this cam and driving it on the steet? In what engine? What base timing are you using?
Comp Cams state a 1500 - 5500 RPM range....is this going to work on the street?....what was I thinking
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
For a stock motor with stock lousy heads like you have it will work but not like if you had some decent compression and a better set of heads. Beyond that I think the 268 is a very mild cam. Yes it can easily be run on the street. I would and do run a much larger cam on the street.
Burning Brakes
Joined: Feb 2003
Posts: 1,128
Likes: 4
From: Upland Ca
I have this cam in my son's 72 1/2 ton short bed. Rebuilt short block with flat tops. Vortec heads, Lar's carb. 350 THM with shfit kit, stock converter. It runs good, nice lope on idle, will laydown a nice loooooooong chrip in second, and gets decent mileage. Good cam for every day driver.
Le Mans Master
Joined: Apr 2000
Posts: 5,202
Likes: 10
From: cincinnati ohio
St. Jude Donor '09
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Pro
Joined: Feb 2003
Posts: 582
Likes: 0
From: Ashaway RI
Installed this cam into my '81 rebuild...and now wondering what in the world I was thinking...
Anyone have this cam and driving it on the steet? In what engine? What base timing are you using?
Comp Cams state a 1500 - 5500 RPM range....is this going to work on the street?....what was I thinking
Anyone have this cam and driving it on the steet? In what engine? What base timing are you using?
Comp Cams state a 1500 - 5500 RPM range....is this going to work on the street?....what was I thinking
Racer
Joined: Mar 2004
Posts: 292
Likes: 2
From: Plumas Lake CA
I've got this cam in my 350, using L98 aluminum heads, 650 Mighty Demon, Holley dual plane, and Hooker header/sidepipes. It pulls about 17" of vacuum at 650 rpm. I'm still tuning it and my tranny (stock turbo 400, not downshifting or upshifting properly) is not set up right but I think it runs really well. I've got 35 degrees of total timing, 12 degrees initial. I'm going to go with a 700R4 with my 3.08 gearing and finish dialing it in.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
For a stock motor with stock lousy heads like you have it will work but not like if you had some decent compression and a better set of heads. Beyond that I think the 268 is a very mild cam. Yes it can easily be run on the street. I would and do run a much larger cam on the street.
Still using the stock intake and E3ME carb though...at least at this time as I was going to have to go through emissions testing...but not anymore....no moer EGR valve, AIR pump...all sitting on the shelf.
I was just wondering about base timing setting....originally was 8 BTDC...not sure it will go that low and idle.
Le Mans Master
Joined: Apr 2000
Posts: 5,202
Likes: 10
From: cincinnati ohio
St. Jude Donor '09
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Thats what I did. I unplugged the computer, set the timing to around 10 BTDC; plugged the computer back in, then held the engine at 2000 rpm and set the timing to be 36-38. I did not go back and see what the base timing was afterwards with the computer unplugged....it was 12-14 with the computer plugged in at idle.
Le Mans Master
Joined: Apr 2000
Posts: 5,202
Likes: 10
From: cincinnati ohio
St. Jude Donor '09
Thats what I did. I unplugged the computer, set the timing to around 10 BTDC; plugged the computer back in, then held the engine at 2000 rpm and set the timing to be 36-38. I did not go back and see what the base timing was afterwards with the computer unplugged....it was 12-14 with the computer plugged in at idle.
Instructor
Joined: May 2006
Posts: 127
Likes: 0
From: Smethport PA
I just installed a 268H into an 81 and dyno tuned it this morning. You guys are right on with the timing. Best runs were at 35 degrees. Intial on this car was 15.5.
The cam makes nice power and has a good sound at idle. Nice cam.
The cam makes nice power and has a good sound at idle. Nice cam.
