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Need Cam advice - 383 #1195021 03/11/12 09:34 AM 03/11/12 09:34 AM
Joined: Feb 2012 Posts: 3 West Michigan T turbo36 OP member
turbo36 OP member T Joined: Feb 2012 Posts: 3 West Michigan	I need a second opinion on some cam recomendations for my 65' Plymouth Belvedere II Have two cam recommendations from Comp Cam: XR274HR-10 //Duration: intake .274 - exhaust .282 // lift: intake .538 - exhaust .534 // lobe sep 110 XR280HR-10 //Duration: intake .280 - exhaust .288 // lift: intake .541 - exhaust .537 // lobe sep 110 Here is the build: 65' 383 Block, bored .060 over - deck cut .030 to correct a very bad previous machining job 516 Heads - cut to 71.25cc low compression flat top pistons ( wanted to use forged stock height pistons but the top of the piston would be above the block height comp ratio 9.5 to 1 1 3/4" headers Eddy Performer intake Eddy Performer 600 CFM Carb Comp Hyd roller lifters Comp Roller rockers 4 speed tranny 4.10 posi rear MSD Ignition tire diameter 26.2" weight with driver 3,400 lbs I want a quick/fun cruiser not a strip car. thanks, Bob

Re: Need Cam advice - 383 [Re: turbo36] #1195022 03/11/12 10:06 AM 03/11/12 10:06 AM
Joined: Mar 2005 Posts: 3,145 Central NC gch master
gch master Joined: Mar 2005 Posts: 3,145 Central NC	Go with the smaller one.

Re: Need Cam advice - 383 [Re: gch] #1195023 03/11/12 10:32 AM 03/11/12 10:32 AM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	none of the above. when you use adjustable rockers with those cam profiles you will probably have piston to valve clearance issues and definitely retainer to guide issues. if those heads haven't had some serious reworking they can't use the extra lift. use an xe274 with stock stamped rockers and put the extra money someplace else. don't overcam!

Re: Need Cam advice - 383 [Re: lewtot184] #1195024 03/11/12 11:07 AM 03/11/12 11:07 AM
Joined: Feb 2012 Posts: 3 West Michigan T turbo36 OP member
turbo36 OP member T Joined: Feb 2012 Posts: 3 West Michigan	Why would adjustable rockers be different from non-adjustable? The low comp pistons sit approx .080 further down the hole then the stock pistons, even with the deck cutting we are still better then stock.

Re: Need Cam advice - 383 [Re: turbo36] #1195025 03/11/12 01:32 PM 03/11/12 01:32 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I would go with this XR280HR-10 especially with a 4 speed. and it will lower the cylinder pressures a bit so a little less chance of detonation!

Re: Need Cam advice - 383 [Re: turbo36] #1195026 03/11/12 01:36 PM 03/11/12 01:36 PM
Joined: Jul 2003 Posts: 1,107 Spring Valley ,Ca. moparsquid super stock
moparsquid super stock Joined: Jul 2003 Posts: 1,107 Spring Valley ,Ca.	with low comp id sugest a mp hemi grind or six pac grind,stock rockers will work fine and a 2800 stall converter and 3.91 gears.

Re: Need Cam advice - 383 [Re: turbo36] #1195027 03/11/12 01:45 PM 03/11/12 01:45 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	The smaller one and that is nowhere near enough carb. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Need Cam advice - 383 [Re: turbo36] #1195028 03/11/12 02:36 PM 03/11/12 02:36 PM
Joined: Jan 2003 Posts: 1,307 BC, Canada Black_Bee pro stock
Black_Bee pro stock Joined: Jan 2003 Posts: 1,307 BC, Canada	Do you already have the required lifters and rockers? Im sure that you are aware, but these roller cams you have been recommended cost a small fortune and seem really out of place in your build. If you have to buy the lifters and rockers to support the cam, you are looking at an something like $1000! If you just want a fun quick cruiser, why not look at something like a Comp xe268h or even a xe274h for a fraction of the cost? Paul '69 Super Bee 383 EFI Turbo

Re: Need Cam advice - 383 [Re: Black_Bee] #1195029 03/11/12 02:45 PM 03/11/12 02:45 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	Quote: Do you already have the required lifters and rockers? Im sure that you are aware, but these roller cams you have been recommended cost a small fortune and seem really out of place in your build. If you have to buy the lifters and rockers to support the cam, you are looking at an something like $1000! If you just want a fun quick cruiser, why not look at something like a Comp xe268h or even a xe274h for a fraction of the cost? good advice.

Re: Need Cam advice - 383 [Re: lewtot184] #1195030 03/11/12 03:28 PM 03/11/12 03:28 PM
Joined: Feb 2012 Posts: 3 West Michigan T turbo36 OP member
turbo36 OP member T Joined: Feb 2012 Posts: 3 West Michigan	Thanks to all the replies, very good advice. The reason I was leaning toward the roller lifters and rockers was to have a reliable cruiser using today's oils, cost wasn't a primary issue for this build. Interesting thing; after reading these replies I went to the Comp Cam calculators to see projected HP and torque for these recommendations and was shocked to see the roller cams were 80-90 HP less then the flat lifter cams. Perhaps I'm missing something or the software is wrong?? I am reconsidering the XE series or the magnum (270H or 280H) series now and running the fortified race oils. I'll save my money for the 440 stroker build

Re: Need Cam advice - 383 [Re: turbo36] #1195031 03/11/12 03:45 PM 03/11/12 03:45 PM
Joined: Jan 2003 Posts: 1,307 BC, Canada Black_Bee pro stock
Black_Bee pro stock Joined: Jan 2003 Posts: 1,307 BC, Canada	Quote: Thanks to all the replies, very good advice. The reason I was leaning toward the roller lifters and rockers was to have a reliable cruiser using today's oils, cost wasn't a primary issue for this build. Interesting thing; after reading these replies I went to the Comp Cam calculators to see projected HP and torque for these recommendations and was shocked to see the roller cams were 80-90 HP less then the flat lifter cams. Perhaps I'm missing something or the software is wrong?? I am reconsidering the XE series or the magnum (270H or 280H) series now and running the fortified race oils. I'll save my money for the 440 stroker build Regular oil plus a ZDDP additive is pretty cheap. Something isn't right with Comp's calculator then... from a stock cam to the largest solid roller and everything in between, it is unlikely that there would be 90HP difference in your combo coming from the cam only. Paul '69 Super Bee 383 EFI Turbo

Re: Need Cam advice - 383 [Re: Black_Bee] #1195032 03/11/12 05:10 PM 03/11/12 05:10 PM
Joined: Jan 2003 Posts: 313 nj M MoJoe enthusiast
MoJoe enthusiast M Joined: Jan 2003 Posts: 313 nj	I have the xe268h in my Roadrunner without the roller set up. I have basically a stock rebuild .30 over, stock exhaust manifolds, 355 gears, 4 speed, DP4B intake and the 600 Eddie carb. It's fast and fun... I like it.

Re: Need Cam advice - 383 [Re: turbo36] #1195033 03/11/12 07:26 PM 03/11/12 07:26 PM
Joined: Jan 2003 Posts: 5,186 Wherever I am. J Junky master
Junky master J Joined: Jan 2003 Posts: 5,186 Wherever I am.	If ya want a fun cam for the street, try the Hughes Whiplash cam. I have that in my 383. I'm very happy with it. That 600 carb ain't gonna cut it! A good carburetor, among a few, is the Holley 750. Good all around carb for what you need and the one I run. 2010 Black Challenger SE <> 3.5 V6 Custom Shift Knobs www.flameball.com Check It Out

Re: Need Cam advice - 383 [Re: turbo36] #1195034 03/11/12 09:17 PM 03/11/12 09:17 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	Quote: Thanks to all the replies, very good advice. The reason I was leaning toward the roller lifters and rockers was to have a reliable cruiser using today's oils, cost wasn't a primary issue for this build. Interesting thing; after reading these replies I went to the Comp Cam calculators to see projected HP and torque for these recommendations and was shocked to see the roller cams were 80-90 HP less then the flat lifter cams. Perhaps I'm missing something or the software is wrong?? I am reconsidering the XE series or the magnum (270H or 280H) series now and running the fortified race oils. I'll save my money for the 440 stroker build you can buy an awful lot of zinc additive for the extra cost of a hydraulic roller, not to mention that to my knowledge nobody makes a good .904 hydraulic roller tappet. i was just over at the 62-65 mopar site and there's a good article written by don dulmage on building a 383. read it and take special note about cam profiles, piston to valve clearance. they're good engines, i used to hot rod them, but easy to screw up with hot cams.

Re: Need Cam advice - 383 [Re: lewtot184] #1195035 03/11/12 11:13 PM 03/11/12 11:13 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	I agree. All of the cams are too big except maybe for the 268, and I'd go a step smaller than that! A 383 is ridiculously easy to overcam. Those hydraulic rollers are way too big. IF cost is no obstacle I'd say telephone Hughes and talk it through. Buy the whole shebang from them and you should be good. Most of the cam manufacturers are 10 times more familiar with a chevy engine than a Mopar, and a smallblock chevy 383 is a whole different breed than long-rod short-stroke 383. Or go to the Lunati Voodoo series, probably a 302. R.

Re: Need Cam advice - 383 [Re: turbo36] #1195036 03/12/12 05:08 AM 03/12/12 05:08 AM
Joined: Jan 2003 Posts: 8,940 Holly/MI D Dean_Kuzluzski master
Dean_Kuzluzski master D Joined: Jan 2003 Posts: 8,940 Holly/MI	Just my opinion but if you're going to run a 4.10 gear and a 26" tire...... then I'd add more cam, carb and intake to make it worth all that wasted rpm on the street. Or, dial back to a 3.55 to use the low-end torque the milder cam/intake/smallish carb will provide for you. Add the 1.74 exhaust valve to those 516's, if you haven't already, do a bowl porting to clean them up. Run the thin steel headgaskets to get best compression. Personally, I'd run a Performer Rpm or an old DP4B, a 700 cfm Holley and a cam with 224-228 @ .050 duration. Once you get into the 230+ duration cams, carb & mech. advance mods, although already required, get pretty intense for best throttle response/driveability. Your set-up with 3.55 gears would be good spirited driving with some very respectable fuel economy. Last edited by Dean_Kuzluzski; 03/12/12 05:09 AM. R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04

Re: Need Cam advice - 383 [Re: Dean_Kuzluzski] #1195037 03/12/12 10:15 AM 03/12/12 10:15 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	I personally wouldnt run either 1 of those cams. I hope you put larger valves in those 516s. I tried a set and my 383 quit pulling arount the 1000ft mark in the quarter. put a set of 452s and they made a ton of difference.. I am truckless..

Re: Need Cam advice - 383 [Re: turbo36] #1195038 03/12/12 03:30 PM 03/12/12 03:30 PM
Joined: Apr 2008 Posts: 1,285 Pacific NW USA CompSyn pro stock
CompSyn pro stock Joined: Apr 2008 Posts: 1,285 Pacific NW USA	Give Bob a call...

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