B motor 512 cam advice
#2699866
09/22/19 01:51 PM
09/22/19 01:51 PM
|
Joined: Jun 2018
Posts: 114 Oklahoma City, Oklahoma
MrMayhem
OP
member
|
OP
member
Joined: Jun 2018
Posts: 114
Oklahoma City, Oklahoma
|
https://www.compcams.com/magnum-250-250-solid-flat-cam-for-chrysler-383-440.htmlHey all, like most of us I am on a budget and I am trying to make the most with what I have. I am building a B based 512 for 72 Duster with the goals of being somewhere in the 600-650Hp range. I am doing some parts trading to help a friend out more than myself and in the trade I an going to end up with a Comp cams Magnum 250/ solid cam and lifters. Is there any opinion on this cam that could be shared and how it might perform in the theoretic 512 B based combo with a heads the flow 300 cfm. How well would this cam perform in the 512 packed noted below? Currently I have a set of fully ported Bruce Toth heads (same casting as the Marsh performance heads), Set of Crane Gold 1.6 rockers I bought new many years ago, 2 intakes to choose from Eddy RPM and a M1 single plane, both intakes being fully ported and gasket matched. With a Quick Fuel 850 dp to top it off until I go EFI. As per a previous post I am still waiting to purchase my bottom end but I except to do so in the next 2 months. Also on the shelf is a Comp Cams XE284 that I feel is a bit small for the goal I trying to reach. Thanks
|
|
|
Re: B motor 512 cam advice
[Re: MrMayhem]
#2699880
09/22/19 02:45 PM
09/22/19 02:45 PM
|
Joined: Aug 2011
Posts: 2,872 Pattison Texas
CSK
master
|
master
Joined: Aug 2011
Posts: 2,872
Pattison Texas
|
cam is to small in my opinion. add some lift & about 10 to 15 deg of duration , that 250 cam will be in the 550 hp range at best with 300 cfm in my opinion, call & talk to Dwayne Porter, Porter Racing Heads
Last edited by csk; 09/22/19 02:54 PM.
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
|
|
|
Re: B motor 512 cam advice
[Re: AndyF]
#2700106
09/23/19 11:44 AM
09/23/19 11:44 AM
|
Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,020
Frostbitefalls MN (Rocky&Bullw...
|
No specific cam recomendation hear, just an opinion on cam choice. Write down the charactotistics you want in a cam. Things like maintenance intervals, where you want it to smooth out so it can work well with your trans, quality of parts you are willing to buy. Add anything else you think is important. The LAST thing you want on your list is a horsepower goal. That often forces the builder into a compromise they may not like for a mostly street car.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
Re: B motor 512 cam advice
[Re: gregsdart]
#2700356
09/24/19 08:18 AM
09/24/19 08:18 AM
|
Joined: Jan 2003
Posts: 13,402 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,402
Marion, South Carolina [><]
|
No specific cam recomendation hear, just an opinion on cam choice. Write down the charactotistics you want in a cam. Things like maintenance intervals, where you want it to smooth out so it can work well with your trans, quality of parts you are willing to buy. Add anything else you think is important. The LAST thing you want on your list is a horsepower goal. That often forces the builder into a compromise they may not like for a mostly street car. LOL, that's the opposite of how I do it. I start w/ the power I want, then compromise everywhere else! In all seriousness, Greg gives good advice here. I'm just willing to deal w/ more than most on the street to get the performance I'm after.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
|
|
|
Re: B motor 512 cam advice
[Re: AndyF]
#2700528
09/24/19 05:11 PM
09/24/19 05:11 PM
|
Joined: Jun 2018
Posts: 114 Oklahoma City, Oklahoma
MrMayhem
OP
member
|
OP
member
Joined: Jun 2018
Posts: 114
Oklahoma City, Oklahoma
|
If you are mostly driving on the street then that 294S with the 1.60 rockers and the Performer RPM should be a good combo. Especially if you want to cruise down the freeway to a car show. I'd put it together with that combo and drive it for a year and see how it works for you. Once you get some miles on it you can change your mind. The more I think about it, the more I agree with you Andy. The 16 year old racer in me wants a 700 hp monster but in reality, I don't think I would enjoy driving a race car as much as I want to drive this. I have been following your Duster build very closely and love the work you do and your articles. I am at the point where I have everything I need to build this engine minus the rotating assembly. I hope to have that purchased in the next 2-3 weeks or I'll blow the cash on something else I dont need lol. I just want to make sure it's done right the first time so it only needs done once. Thanks for the input
Last edited by MrMayhem; 09/24/19 05:13 PM.
|
|
|
Re: B motor 512 cam advice
[Re: MrMayhem]
#2700596
09/24/19 08:53 PM
09/24/19 08:53 PM
|
Joined: Jun 2015
Posts: 150 It's Complicated
HDNMOPERS
member
|
member
Joined: Jun 2015
Posts: 150
It's Complicated
|
This is what I'm running in my low deck 512. With 1.6 RAS rockers B3 Geometry set up 10.3 comp Trick Flow 240s M1 single plane both ported by Larry Smith with a 850 Thumper carb. Been to busy with work to dyno. But will be on the pump in about a week or so. I will post results. Hoping for any where between 590-610 hp. Will see though. Not chasing a number. It will make what it makes. But should be a real nice pump gas street engine.
Last edited by HDNMOPERS; 09/24/19 09:00 PM.
|
|
|
Re: B motor 512 cam advice
[Re: HDNMOPERS]
#2700829
09/25/19 03:30 PM
09/25/19 03:30 PM
|
Joined: Jun 2018
Posts: 114 Oklahoma City, Oklahoma
MrMayhem
OP
member
|
OP
member
Joined: Jun 2018
Posts: 114
Oklahoma City, Oklahoma
|
This engine will certainly hit the dyno. I am not opposed to going larger with the cam, I can afford to spend an extra $300-500 to make it perform more to it's potential. Though I still need some sensibility as it will be driven on the street on the weekends going to and from various events. That being said... it was your money what cam would you install?
Last edited by MrMayhem; 09/25/19 03:30 PM.
|
|
|
Re: B motor 512 cam advice
[Re: MrMayhem]
#2700835
09/25/19 03:50 PM
09/25/19 03:50 PM
|
Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
|
We started here because the car will be driven to shows 5-6 hrs away. I seem to recall talk of an overdrive trans, conservative gearing, and a fairly heavy vehicle being part of the mix as well. One size def doesn’t fit all.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
|
|
|
Re: B motor 512 cam advice
[Re: MrMayhem]
#2700838
09/25/19 03:58 PM
09/25/19 03:58 PM
|
Joined: Jun 2015
Posts: 150 It's Complicated
HDNMOPERS
member
|
member
Joined: Jun 2015
Posts: 150
It's Complicated
|
What I installed or what you already have. This car will be used with the same intended use as yours. Im thinking the next cam. If I even do another cam it will still be conservative also. But more like 560-570 lift with 1.6 rockers and roughly 250-260 range @50. But thats just me. I like my pure street stuff more conservative than others.
Last edited by HDNMOPERS; 09/25/19 04:26 PM.
|
|
|
Re: B motor 512 cam advice
[Re: fast68plymouth]
#2700842
09/25/19 04:00 PM
09/25/19 04:00 PM
|
Joined: Jun 2015
Posts: 150 It's Complicated
HDNMOPERS
member
|
member
Joined: Jun 2015
Posts: 150
It's Complicated
|
Thats exactly right Mr Porter. And I think you nailed it with the cam for this build and it's intended use. Matt Hensley thought it was a very good cam for this engines application. During the build.
Last edited by HDNMOPERS; 09/25/19 04:07 PM.
|
|
|
Re: B motor 512 cam advice
[Re: CSK]
#2703294
10/03/19 12:46 AM
10/03/19 12:46 AM
|
Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
|
cam is to small in my opinion. add some lift & about 10 to 15 deg of duration , that 250 cam will be in the 550 hp range at best with 300 cfm in my opinion, call & talk to Dwayne Porter, Porter Racing Heads I agree as I run a Dwayne Porter solid flat tappet cam in my pump gas 493 street car and I love it. He knows his stuff so I would give him a call. Good luck , Ron
|
|
|
|
|