Re: Rocker ratio questions
[Re: fourgearsavoy]
#2594831
12/20/18 10:11 PM
12/20/18 10:11 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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His current cam is 264/270-108....... so he should be used to how that’s going to behave by now.
That Howard’s cam uses faster lobes, so it might be a touch rowdier.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2594912
12/21/18 01:51 AM
12/21/18 01:51 AM
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Joined: Oct 2003
Posts: 4,013 South Park, Pa.
68LAR
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South Park, Pa.
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Gus, With your car being a good 300 pounds lighter than mine, that cam may work well. I personally would look for a cam that has a power band around 3500-7000 or so. But that's just me. We all have our preferences. Like my post about 10 second street/strip cars. Lot's of different combos that seem to be working. Why have a cam that will go to 7600 rpm that your engine will never see? Combo, combo.. If I can offer any suggestions, please feel free to PM me.
Last edited by 68LAR; 12/21/18 01:55 AM.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Rocker ratio questions
[Re: 68LAR]
#2594950
12/21/18 07:05 AM
12/21/18 07:05 AM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
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Sydney,Australia
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Gus, With your car being a good 300 pounds lighter than mine, that cam may work well. I personally would look for a cam that has a power band around 3500-7000 or so. But that's just me. We all have our preferences. Like my post about 10 second street/strip cars. Lot's of different combos that seem to be working. Why have a cam that will go to 7600 rpm that your engine will never see? Combo, combo.. If I can offer any suggestions, please feel free to PM me. I remember when choosing the cam for my 505 i think Hughes noted go about 2 cam sizes over what you would choose for a 440 . I have 258@050 in the 440 i went 272@050 in the 505 . Both have a softer/slower ramp , definately softer than a Howards grind Cam choice is like choosing beer , each to their own . But to initial question i like stock ratio with appropriate cam speced Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2595021
12/21/18 12:48 PM
12/21/18 12:48 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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From what I’ve seen..... with stick cars in particular....... is that “usually”a cam that’s a bit too small will run quicker than one that’s a bit too big.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Rocker ratio questions
[Re: fast68plymouth]
#2595029
12/21/18 01:04 PM
12/21/18 01:04 PM
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Joined: Oct 2003
Posts: 4,013 South Park, Pa.
68LAR
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South Park, Pa.
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From what I’ve seen..... with stick cars in particular....... is that “usually”a cam that’s a bit too small will run quicker than one that’s a bit too big. This is what Scott Brown told me. I was running a MP590 prior. My car picked up a bunch after the Scotty cam was installed. Heavy stick cars are a different breed from auto cars. No insult intended. Just stating what I've heard and learned. Also, with my combo, I went to the 1.6 rockers and picked up a bit more. I run the 1.6's on both valves.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Rocker ratio questions
[Re: 68LAR]
#2595250
12/21/18 10:21 PM
12/21/18 10:21 PM
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Joined: Dec 2004
Posts: 10,556 Rittman Ohio
fourgearsavoy
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This is the hydraulic roller I was looking at With Comp's Hydraulic Roller Retrofit camshafts, you can get all the benefits of the increased power which comes from a roller cam with the low maintenance of a regular hydraulic. Plus, there's no worries of the cam going flat, having to do the correct "break in" process, etc. After helping customers through dozens and dozens of builds, we found that Comp's largest off the shelf Hydraulic Roller just wasn't big enough for the 500 inch and larger engines running a good flowing (325+ CFM) head such as our CNC Stealth heads. We had many customers who had Comp custom grind them this particular cam, and it worked so well that we decided to offer it as an "off the shelf custom," keeping them in stock at all times for our customers. The .571" lift and 252 intake and 258 exhaust duration at .050" really lets the more serious builds reach their potential, while still having enough low end for some street use. These are ground on a 110 degree lobe separation angle. We'd use about a 3500 stall, and some decent rear end gears (3.55-4.10 for the street,) and a minimum of 10:1 compression. With this setup, we recommend our 145-1008 Hydraulic roller lifters, our 145-1014 springs, our 145-1003 retainers, and our 145-1002 locks (if you are using valves with 11/32" stems.) Also, this cam uses three bolt timing chain sets. We carry them (along with the required bolts, etc.) on our timing chains page. And, since this is Comp we're talking about, you can be assured of two things: The product is 100% made in the USA, and the quality is second to none. If you're planning on using this cam, give us a quick call so we can go over your build and make sure everything sounds correct before you pull the trigger. It's a custom deal ground for 440 Source and it looks like a decent cam. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Rocker ratio questions
[Re: AndyF]
#2595260
12/21/18 10:45 PM
12/21/18 10:45 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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264/272 at 050 is going to be pretty rowdy on the street in a pump gas 500 inch engine. You can make it work with a low restriction exhaust and careful carb/ignition tuning but you'll definitely hear it coming. My cam from Dwayne is 264 & 270 @ .050 with .585 & .592 lift on a 110 LSA. I have it in the eng on the recommended 106 ICL. If you watch the video when they go to the back of my car you can hear how it idles pretty good but I did have it idling a bit high in the video. But the cam works great in my 493 driving on the street. It actually sounds a bit milder to me then I thought it would but I love it. Ron https://www.facebook.com/moparmusclemag/videos/10155914655157792/
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2595265
12/21/18 10:52 PM
12/21/18 10:52 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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when they go to the back of my car you can hear how it idles pretty good Baddest cam at the drive in Love the sound of that motor.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2595266
12/21/18 10:54 PM
12/21/18 10:54 PM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
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Comp's largest off the shelf Hydraulic Roller just wasn't big enough for the 500 inch and larger engines? Tighten the LSA to 104.
Boffin Emeritus
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Re: Rocker ratio questions
[Re: fast68plymouth]
#2595269
12/21/18 11:00 PM
12/21/18 11:00 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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when they go to the back of my car you can hear how it idles pretty good Baddest cam at the drive in Love the sound of that motor. Me too thanks to you. Thanks Dwayne , Ron
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2595284
12/21/18 11:25 PM
12/21/18 11:25 PM
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Joined: Aug 2011
Posts: 2,871 Pattison Texas
CSK
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Pattison Texas
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My cam is very close to that comp cam [video:youtube] https://youtu.be/c4jgbv98adY[/video]
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Rocker ratio questions
[Re: GY3]
#2595714
12/23/18 09:20 AM
12/23/18 09:20 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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Balt. Md
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Since we are doing videos... This was before mufflers, drag radials and I had the rev limiter set way low at 5500(?) as I recall. https://youtu.be/FcKEEDBRwno I only posted mine because my cams duration at .050 is very close to the 264 & 272 Andy was talking about. But I enjoyed yours and csk's video's also. Thnaks for posting them, Ron
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Re: Rocker ratio questions
[Re: fast68plymouth]
#2595715
12/23/18 09:23 AM
12/23/18 09:23 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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Too Many Posts
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Balt. Md
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when they go to the back of my car you can hear how it idles pretty good Baddest cam at the drive in Love the sound of that motor. I knew the 'Drive In" reminded me of something as it was the GTO commercial around 1970 about the GTO called the "Humbler". I now remember the commercial with the Humbler GTO cruising through the drive-in and hearing the exh right at the exh tips. You have a good memory Dwayne. Ron
Last edited by 383man; 12/23/18 09:23 AM.
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Re: Rocker ratio questions
[Re: 383man]
#2597789
12/27/18 10:50 PM
12/27/18 10:50 PM
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Joined: Dec 2004
Posts: 10,556 Rittman Ohio
fourgearsavoy
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Well I'm looking at another Howards cam 260/268 duration and 555/574 lift with 108 separation. The lift seems a little low but the duration is where I think would work with my car. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Rocker ratio questions
[Re: fourgearsavoy]
#2597881
12/28/18 03:59 AM
12/28/18 03:59 AM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
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Gus , no thought on getting a custom grind ?
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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