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Krc "rv" Cam

10K views 34 replies 17 participants last post by  Ricker97  
#1 ·
KRC Performance has a cam grind they call "RV". 200/206 480/480 lift on 112 with 1.6 RR. I have a set of Harland Sharp 1.7 RR on my stock 5.2L. What would happen if the 1.7 RR was used with this RV cam. Would it improve or hurt the performance of this cam.
 
#6 ·
KRC Performance has a cam grind they call "RV". 200/206 480/480 lift on 112 with 1.6 RR. I have a set of Harland Sharp 1.7 RR on my stock 5.2L. What would happen if the 1.7 RR was used with this RV cam. Would it improve or hurt the performance of this cam.
The 1.7 ratio has a quicker ramp-up speed than the 1.6. I doubt you'd hear a difference in the sound of the engine though.

i couldn't find it on there website.the only cam close was the 206 cam.
Yeah I'm thinking it's the 206 cam. Same specs but not totally sure.
 
#7 ·
I don't beleive KRC has it listed on their web site. I found it while I was reading through the old posts. Bill, I think from KRC, had Comp Cams grind it and he put it in his Durango to try it out. With the pretty much stock (I don't remember all that was changed prior to this cam install, headers and R/T heads was) Durango, it made great torque and was very streetable.

I'm looking for a rebuild that I can run in our bi-annually mud race. The track (actually a trail) is about 1/8 mile long, with alot of mud/water pits, moguls,turns, and straight-a-ways. So alot of on/off the gas racing. Thought maybe this cam with the low rpm torque and higher rpm range would be a good fit.

Any other suggestions on a better cam? Thanks Ricker
 
#8 ·
if your rebuilding the engine because it needs refreshing,then i think its a GREAT cam choice,i'm planning on using it in my rebuild (if i can't locate an R/T+10 cam) this coming fall.if you just looking to swap cams only,then don't waste your time.
 
#10 ·
is there room for that lift on a 318? how big can you get away with?
 
#12 ·
I put the e-bay camin my watch page. The rust doesn't seem to bad, I think it would clean up. If I was going to sell a cam on e-bay I would at least make an attempt to try and clean it up, especially if the effort was taken of having it checked out by a local machine shop. Plus no cam card, not the end of the world for that price, I'll keep an eye on it. Thanks for the heads up. Alot of people have been pushing me toward the KRC 206x 206/210dur. 480/512lift 108. A friend said this cam should do everything I want plus have the lopey idle I was looking for. I'll keep ya posted on decision. Thanks again Ricker
 
#13 ·
its really nice of you guys on this website to look after each other with ebay deals and such.unfortuntatly,this is just a bit to big for me,as i'm going to retain my 1.7 rockers and want to keep gross lift under .510-.520.
 
#16 ·
is that for the 318 or 360? I thought I read on here that the 318 pistons have no relief in them and the 360's do.
 
#17 ·
does the 210x cam effect gas milage ?
 
#20 ·
That's the valve relief on a stock 360 piston, my new cam ill be putting in with the 1.7s will be around .561/.569 and i shouldn't have any valve to piston clearance issues, im also going to use .620lift springs for a better seat pressure.

I don't think .535 is the max...
I'd be interested to know the duration on your cam. I also have a 360 with a fair bit of lift on the cam. I checked with clay and piston to valve was close but I thought it looked OK. However, I haven't run it yet so it's not a done deal yet.

In my case I have only .512/.512 lift (with 1.6 rockers) but I also decked the block 40 thou and used a .027 gasket, so my net equivalent is:

.512 + .040 + (.040 - .027) = .565

cam duration is 227/234 @ 50

I have the same springs as you.
 
#22 ·
The 318 pistons are a true flat top piston with no valve reliefs and I'm not sure what the max lift you can run is, but I've got .512 .512 lift on my cam and it is really close, even after retarding it back -4 degrees with the timing chain.
 
#31 ·
A little update...I ended up calling Comp Cams and with the motor I'm building they suggested thier #20-746-9 cam. I believe this is the same cam that Harsh-R/T is using.
265/273 Duration (216/224 @ .050)
506/ 506 Lift 114 LSA

I want to use this with 1.7 RR, so I can get more lift (Mopar 6062 .600" lift springs will also be used). What would be my lift with these? I'm thinking .538"
 
#33 ·
Make sure to check p2v. My guess is that .538 with that duration will be too much lift for a 318. What size valves? Stock flat-top pistons? Def will need to measure and maybe need to fly-cut those pistons..
 
#34 ·
Make sure to check p2v. My guess is that .538 with that duration will be too much lift for a 318. What size valves? Stock flat-top pistons? Def will need to measure and maybe need to fly-cut those pistons..
Yes. A guy recently tried to install a .488/.488 210/210 on a 110+4 in his 5.2and didn't have the .080 int/.100 exh P2V clearance he was looking for.

http://www.bionicdodge.com/bionic/index.php?topic=10753.0
 
#35 ·
I'm sorry, when I first started this thread back in Feb. I was looking to rebuild the 5.2L that was in the truck, but after tearing it down I found some problems and a friend had a 5.9L block that was already machined for a stroker build, so I changed horses in mid stream and went with a 408. I didn't realize I never updated this thread until now.
The Ross pistons I'm using have the valve cuts in them.