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Username Post: 327 cam , did some homework        (Topic#354087)
60chev 
Contributor
Posts: 113
60chev
Loc: Rotchester, NY
Reg: 01-24-09
11-27-18 09:06 AM - Post#2752525    

So here's what I have : 57 chevy factory 3:55 posi, turbo 400 w/shift kit and 2000 stall. Motor is originally 1969 327 2bbl 1.72 small valve headed flat top pistons. Factory says 9:1 CR?. I put on edelbrock performer rpm hi-rise dual plane intake with edelbrock 600cfm carb. Long -tube headers with cherry bomb type mufflers(loud). Has HEI ignition. Power brakes. Still running factory cam(390/410 I guess) which is probably worn some. Runs good but definitely needs more cam to make my combo work. I looked on grumpy's cam chart on here and I surmised this cam spec: Dur @ .050" 209/216 | Lift .435/.455 | Lobe Sep. 110/110
GOOD LOW END TORQUE AND PULLING POWER.
RPM Range 1500-4000. I like the tighter LSA for quicker flatter torque and also doesn't kill vacuum for my power brakes. I use as daily driver here and there so I dont want to kill MPG either. My highway engine rpm is around 3000. What do you-all think? Thanks in advance. By the way the camquest calculator is down.

60chev

1957 Bel-Air 4-door 327/th400
1979 C20 350/4speed


 




65_Impala 
Very Senior Member
Posts: 4139

Reg: 12-29-02
11-28-18 09:29 AM - Post#2752661    
    In response to 60chev

I think you're in the right ballpark with that cam spec. Go too more duration and you'll need more stall. The operating range is typically based on a 350 displacement, so with the smaller displacement it will go up a little.



 
Shepherd 
Frequent Contributor
Posts: 1551

Loc: Lake George, NY
Reg: 11-11-15
11-28-18 10:45 AM - Post#2752670    
    In response to 60chev

That set up is almost identical to the 305 in my 51 Belair, .030 over, decked block, about 9.3 with flat tops and 60 cc stock 1.72 heads.That cam has nothing over 4k, I would have liked the next step up. My car is 3.08, cruises just right at 65-70. With 3.55 you will run out of steam pretty early. Of course no matter what you do here, the heads are the limiting factor, All in all, that cam should get the job done,



Edited by Shepherd on 11-28-18 01:49 PM. Reason for edit: No reason given.

 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17232
grumpyvette
Age: 70
Loc: FLORIDA USA
Reg: 03-16-01
11-28-18 11:06 AM - Post#2752672    
    In response to Shepherd

the main advantage the 327 potentially has is the short stroke and the engines ability to rather easily reach upper rpm ranges, obviously a auto transmission limits your choices but Id certainly suggest upping the game at least marginally from that level

https://www.summitracing.com/parts/crn-100052?seid ...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 
60chev 
Contributor
Posts: 113
60chev
Loc: Rotchester, NY
Reg: 01-24-09
11-29-18 06:52 AM - Post#2752766    
    In response to grumpyvette

Thanks for the responses guys. Grumpy, would that .454 cam hurt my vacuum for power brakes? Also would a wider LSA like 112 help with the RPMs on the .435 cam? Thanks.

60chev

1957 Bel-Air 4-door 327/th400
1979 C20 350/4speed


 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17232
grumpyvette
Age: 70
Loc: FLORIDA USA
Reg: 03-16-01
11-29-18 07:29 AM - Post#2752770    
    In response to 60chev

why not talk to the tech guys at crane cams,and ask their opinion also,
I have used that cam in the past but it was in a 383 SBC, and I don,t remember having any power brake booster issues but my combo and brakes may not match what you have in your car

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


 
Rick_L 
Honored Member
Posts: 27510
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
11-29-18 08:54 AM - Post#2752785    
    In response to 60chev

Your engine is severely limited by the heads with the 1.72" intake valves.

You will be well served to get some better heads. Anything with at least a 1.94" intake valve will be a quantum leap.

If you do a camshaft and keep your heads you're killing yourself because the cam is going to kill low end power, and the heads are going to restrict high end power no matter what the camshaft is.



 
60chev 
Contributor
Posts: 113
60chev
Loc: Rotchester, NY
Reg: 01-24-09
11-30-18 06:27 AM - Post#2752882    
    In response to Rick_L

I know the heads are weak but Ive had success with cams in the past with these heads. Im just trying to find the right balance for my application. Im not racing or any thing. Just want to do burn-outs and get on it once in a while. Also Im running 87 octane which Im gonna keep. I go to swapmeets all the time and plan on some rebuildable heads eventually. The rpm I drive at is right in the midrange of the engine 2000-4000 so im trying to get close to that for VE in my cam selection. Thanks for the suggestions and comments.

60chev

1957 Bel-Air 4-door 327/th400
1979 C20 350/4speed


 
60chev 
Contributor
Posts: 113
60chev
Loc: Rotchester, NY
Reg: 01-24-09
12-01-18 06:36 AM - Post#2752977    
    In response to 60chev

After doing more extensive research, Grumpy is right on the money for my application and set-up. I ordered the Comp .454 cam. Its going to do exactly what my powertrain wants and should be a lot of fun. Thanks Grump

60chev

1957 Bel-Air 4-door 327/th400
1979 C20 350/4speed


 
busterrm 
Frequent Contributor
Posts: 1222
busterrm
Loc: Wichita Falls, Tx
Reg: 08-30-10
12-01-18 03:56 PM - Post#2753022    
    In response to 60chev

I agree, you need larger valves, those little 1.72 intakes are seriously limiting your engine breathing abilities. 1.94 or 2.02 would be a massive increase in performance.

==== BOB ====
If I can't smoke the tires I want more!

1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2008 Harley Davidson XL1200 Sportster


 
69_BOWTIE 
Senior Member
Posts: 1009

Loc: WYOMING,USA
Reg: 02-27-02
12-04-18 06:59 PM - Post#2753404    
    In response to busterrm

I run about the same setup as you (64/327) but I have a set of 461 heads and a 700r4 trans. Engine Pro#1991= dur @50 224/224 ,adv. dur. 298/298, valve lift 465/465,lobe sep. 107 2k/5500 rpm. love this cam and great vacuum pulls like a train and when diving decent will get 14/16 mpg in a 69 C-10 WITH 3:73. Nice little lope to boot
My 63 Imp. has a 700r4,3:36 30 over original 327 with the power pack heads Speed Pro #1014R Dur @50 204I/214E,Adv.Dur.270I/280E,Valve lift
420I/442E 1500/4000RPM this pulls pretty dam good allso , seat of the pants dyno is a good cam and pretty steady at 14 mpg not a lot of seat time in it but very respectful cam in this tug boat

2001 Silverado 4X4
2005 FXDWGI
69 CHEVY Short Step
63 IMPALA 2/DR HRDTOP 327


Edited by 69_BOWTIE on 12-04-18 07:10 PM. Reason for edit: No reason given.

 




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