urgent camshaft question
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I can't find any info on Jones cams, Do you have the actual cam card or specs. I could run some dyno simulations to see what it is doing. I have a dart 215 head flow chart for the optional 2.08/1.625 valve and factory porting job. I suspect yours are the standard 2.055/1.60
Those are good heads without the spark plug to header pipe problems like AFR. They also don't have the oil drain back problems like AFR.
The inverted flank rollers were an idea from years ago. IMO dumb. I think that if you went to the drag races to the Competition eliminator area of the pits and ask them what kind of cam they have. Very few of them would have IF cam lobes. these are the peak of technology racing in strict cubic inch per pound classes. where the best ideas win
Those are good heads without the spark plug to header pipe problems like AFR. They also don't have the oil drain back problems like AFR.
The inverted flank rollers were an idea from years ago. IMO dumb. I think that if you went to the drag races to the Competition eliminator area of the pits and ask them what kind of cam they have. Very few of them would have IF cam lobes. these are the peak of technology racing in strict cubic inch per pound classes. where the best ideas win
Last edited by gkull; Nov 10, 2011 at 10:46 AM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
250/254 280/286 110lsa .670 solid roller
Gen 1 sbc
1000rpm idle
The microphone is horrible so the sound above idle sounds like azz;very distorted
Put something like this in a 1/4in less stroke its going to be pretty rowdy.
With a 108 lsa even more so.
Id use more compression if you can.
http://www.youtube.com/watch?v=Dk-R_ozjGqE
Like Gkull said build the bottom end for 8...probably need it.
Gen 1 sbc
1000rpm idle
The microphone is horrible so the sound above idle sounds like azz;very distorted
Put something like this in a 1/4in less stroke its going to be pretty rowdy.
With a 108 lsa even more so.
Id use more compression if you can.
http://www.youtube.com/watch?v=Dk-R_ozjGqE
Like Gkull said build the bottom end for 8...probably need it.
Last edited by cv67; Nov 10, 2011 at 10:45 AM.
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
The OP's cam should work fine IMO. I've run a 254/254 duration Isky solid flat tappet cam with a 108 deg LSA installed at 104 deg ICL in my 327 L76 Vette with 11:1 compression ratio and a 4-speed stick. The vacuum was very low making for a rough idle; however, when above 2500 rpm, the cam came alive and was very strong to 6500+ rpm. I had to make sure that I would never drive below 2000 rpm. Sure sounded great - lots of good compliments!
As far as solid rollers, they help vacuum with the quicker valve action, even more so with the inverted flanks so that the overall duration at the closing points is decreased compared with flat tappets. I've run a 234/244/112 Crower solid roller in my C3 with a 406, and currently run a larger 243/249/110 Lunati Voodoo solid roller in that motor. The vacuum even is about 10" Hg at idle; so I think you'll be fine with your selection even considering the shorter stroke of your motor.
As far as solid rollers, they help vacuum with the quicker valve action, even more so with the inverted flanks so that the overall duration at the closing points is decreased compared with flat tappets. I've run a 234/244/112 Crower solid roller in my C3 with a 406, and currently run a larger 243/249/110 Lunati Voodoo solid roller in that motor. The vacuum even is about 10" Hg at idle; so I think you'll be fine with your selection even considering the shorter stroke of your motor.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
www.jonescams.com
alias camking on speedtalk.
Please remember that the stroke is smaller but overal Ci is 347. It's the amount of air that the engine inhales that makes for the way the cam is going to preform. The cam doesn't see the stroke.
alias camking on speedtalk.
Please remember that the stroke is smaller but overal Ci is 347. It's the amount of air that the engine inhales that makes for the way the cam is going to preform. The cam doesn't see the stroke.
Last edited by Belgian1979vette; Nov 10, 2011 at 03:02 PM.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
243/248 isn't that bad. I ran a 242/248 with 1.6 rockers in my 383. It made great power from 3500 - to my 7500 red line. It was before I had my 825 cfm carb dialed in by a race shop, so it suffered down low.
with a good tune and a 4.11 and manual tranny it would have really run. I pulled that 383 out and installed a 427 small block and I had the carb completely worked over.
Good luck with your build
Part # Seat .050" Lift 1.5 1.6 1.7
R64352 256° 210° .352" .511" .545" .579"
R71390 284° 236° .390" .568" .606" .644"
R72350 288° 236° .350" .508" .542" .576"
R72395 288° 240° .395" .575" .614" .653"
R73346 292° 238° .346" .503" .538" .572"
R73400 292° 243° .400" .584" .624" .664"
R73401 292° 244° .401" .586" .626" .667"
R74406 296° 248° .406" .593" .634" .674"
with a good tune and a 4.11 and manual tranny it would have really run. I pulled that 383 out and installed a 427 small block and I had the carb completely worked over.
Good luck with your build
Part # Seat .050" Lift 1.5 1.6 1.7
R64352 256° 210° .352" .511" .545" .579"
R71390 284° 236° .390" .568" .606" .644"
R72350 288° 236° .350" .508" .542" .576"
R72395 288° 240° .395" .575" .614" .653"
R73346 292° 238° .346" .503" .538" .572"
R73400 292° 243° .400" .584" .624" .664"
R73401 292° 244° .401" .586" .626" .667"
R74406 296° 248° .406" .593" .634" .674"
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
