Cam Choices?
#298590
04/24/09 09:59 PM
04/24/09 09:59 PM
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Joined: Jan 2008
Posts: 602
Alexandria, VA
SealockRacing
OP
mopar
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OP
mopar
Joined: Jan 2008
Posts: 602
Alexandria, VA
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so, putting together a list of parts i need to buy to get the motor finished.
wondering about cams, now that i know more about what i will be running.
itll be the stock 72 short block, with like 9-1 compression, probably less. with the edelbrock performers with the 84cc chambers.
itll probably have either a 650 holley my boss gave me, or ill rebuild the old carb my dad ran which is like a 750 but could be an 850, idk.
id like to keep it a sold cam, seeing as we already have the hardland sharp rockers.
so, what would run good in a combo i need to find out what cam some friends ran who had the same combo and ran 10.20's.
also, where can i get new rings for the stock pistons? not sure where to look...
John
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Re: Cam Choices?
[Re: SealockRacing]
#298591
04/24/09 10:55 PM
04/24/09 10:55 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Hello I would let the experts order up a good cam tailored for your combo. Like a SQ lobe from Comp Cams. That engine would be easy to over cam. If your looking at a shelf cam.... The 557 MP would work excellent and be about a max cam for the engine IMO. And should clear fine even with stock pistons. I assume the converter will be up to snuff also, do you know which one you have, or going to get? What intake do you plan to run or have? These will play a important roll on cam selection too. Rings can be had through Summit etc. Get a good set of +.005 rings and file fit them for the bore. It would be nice to get the compression up another point or so. Pump gas will be no problem even with a full point more compression. If the budget allows, give Dewayne Porter a call and mull it over a bit. He has quite a bit of experience with similar combo's... I know you probably already have, but if not check out the Tech Archives Default 500HP combo... 
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Cam Choices?
[Re: SealockRacing]
#298592
04/24/09 11:42 PM
04/24/09 11:42 PM
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Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
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Quote:
so, putting together a list of parts i need to buy to get the motor finished.
wondering about cams, now that i know more about what i will be running.
itll be the stock 72 short block, with like 9-1 compression, probably less. with the edelbrock performers with the 84cc chambers.
itll probably have either a 650 holley my boss gave me, or ill rebuild the old carb my dad ran which is like a 750 but could be an 850, idk.
id like to keep it a sold cam, seeing as we already have the hardland sharp rockers.
so, what would run good in a combo i need to find out what cam some friends ran who had the same combo and ran 10.20's.
also, where can i get new rings for the stock pistons? not sure where to look...
John
No offense...but nobody ran 10.20's in the 1/4 on the motor with the combo your describing.
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Re: Cam Choices?
[Re: RemCharger]
#298597
04/27/09 08:10 PM
04/27/09 08:10 PM
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Joined: Jan 2008
Posts: 602
Alexandria, VA
SealockRacing
OP
mopar
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OP
mopar
Joined: Jan 2008
Posts: 602
Alexandria, VA
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carbs going to be an 850 holley, intake is an old weiand. converter, no idea, but its been 10.30's in this car, and 11.00's in a dart. headers are like 1 and 5/8's or something, pretty big.
i dont plan on spinning this up any higher than 6500.
the motor has about 30 minutes of runtime on it, so i think ill be checking the bearing clearances with some plastigage, and probably reusing the bearings. same with the rings.
also, another question, do arp rod bolts have to be professionally installed, or could i do it with a press at work?
im trying to do as much of this as possible, why pay for something i can do myself?
John
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Re: Cam Choices?
[Re: SealockRacing]
#298598
04/27/09 08:15 PM
04/27/09 08:15 PM
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Joined: Mar 2009
Posts: 1,169
Virginia Beach, VA
Old School
super stock
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super stock
Joined: Mar 2009
Posts: 1,169
Virginia Beach, VA
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headers are like 1 and 5/8's or something, pretty big. are you serious? 
68 cuda formula S 588" bb 5sp
70 CUDA CONVERT 500" 5SP (SUBLIME)
70 CUDA CONVERT 500" 5SP (PLUMCRAZY):TOO MUCH HORSEPOWER, IS ALMOST ENOUGH!
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Re: Cam Choices?
[Re: SealockRacing]
#298599
04/27/09 08:31 PM
04/27/09 08:31 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
carbs going to be an 850 holley, intake is an old weiand. converter, no idea, but its been 10.30's in this car, and 11.00's in a dart. headers are like 1 and 5/8's or something, pretty big.
i dont plan on spinning this up any higher than 6500.
the motor has about 30 minutes of runtime on it, so i think ill be checking the bearing clearances with some plastigage, and probably reusing the bearings. same with the rings.
also, another question, do arp rod bolts have to be professionally installed, or could i do it with a press at work?
im trying to do as much of this as possible, why pay for something i can do myself?
John
if it has only 30 minutes of run time and it has/had good oil pressure then why mess with it, as far as rod bolt's yes you can replace them your self but you will need to re-size the big end of the rod, 1.625 is not big for that motor, that is smallblock size, I would go with a 2" header at the very least. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Cam Choices?
[Re: dartman366]
#298600
04/27/09 09:22 PM
04/27/09 09:22 PM
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Joined: Jan 2008
Posts: 602
Alexandria, VA
SealockRacing
OP
mopar
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OP
mopar
Joined: Jan 2008
Posts: 602
Alexandria, VA
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you guys do understand im 18 years old, and have not been involved with building a big block, let alone putting together my own car right?
i am just eyeballing stuff, ill measure them, whatever size they are, they look big, if i had to guess, id say the collectors are 3.5 maybe even 4 inch...
why do the big ends have to be resized when you install new bolts?
also, ive been told you cant install main studs without having the block line bored.
to me, i dont see the problem, but, im not an engine builder, nor do i have experience with this stuff.
i just know most of the time, a stud is stronger than a bolt.
so i should just check the bearings, make sure everythings in order and stick it together?
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Re: Cam Choices?
[Re: SealockRacing]
#298601
04/27/09 09:47 PM
04/27/09 09:47 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
carbs going to be an 850 holley, intake is an old weiand. converter, no idea, but its been 10.30's in this car, and 11.00's in a dart. headers are like 1 and 5/8's or something, pretty big.
i dont plan on spinning this up any higher than 6500.
the motor has about 30 minutes of runtime on it, so i think ill be checking the bearing clearances with some plastigage, and probably reusing the bearings. same with the rings.
also, another question, do arp rod bolts have to be professionally installed, or could i do it with a press at work?
im trying to do as much of this as possible, why pay for something i can do myself?
John
First off... the converter you got might have gone
10.30s with a strong engine... but the converter
isnt going to stall anywhere near what it stalled
with a high torque engine. The headers are small
but a small header helps to make torque down low
and you will need the help. Pay a shop to install
the rod bolts that way they can re-size them. Forget
the plastigauge... your at a shop, correct, borrow
the proper equipment to check it.... but if its only
got 30 minutes on it, just open a couple bearings
and look at them. But I think your pulling this
engine apart just because you want to... if the engine
has 30 minutes on it and it ran you should be set
(if you truly know about the engines history)... JMO
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Re: Cam Choices?
[Re: SealockRacing]
#298603
04/28/09 12:49 PM
04/28/09 12:49 PM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,163
CT
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If youre going to re-use the stock pistons why not buy some out of an earlier engine to up the compression? I would think the compression drop in '72 is due to a shorter piston, combustion chambers were the same size.
Theres a guy in the big block parts for sale section with a bucket full of them for like 40 bucks. You could probably acheive near 11:1 compression if you shave the heads as well, you will have to take a bit off but I'd say its probably doable.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Cam Choices?
[Re: GTX MATT]
#298604
04/28/09 10:48 PM
04/28/09 10:48 PM
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Joined: Jan 2008
Posts: 602
Alexandria, VA
SealockRacing
OP
mopar
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OP
mopar
Joined: Jan 2008
Posts: 602
Alexandria, VA
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thats another option, but i really just want to get some seat time before i start going fast...
ive never driven this car, nor a car with big tires, and a big block...
ive driven an 11 second smallblock dart, which was plenty fast, but i was 17 at the time.
just want to get something together, get it running pretty good, have some fun, and get used to it. im not going to half [Edited by Moparts - Keep it clean] it, but not going to break the bank just yet...
my next motor will hopefully be alot meaner...
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