284 cam in 360
#226444
02/16/09 09:01 AM
02/16/09 09:01 AM
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Anonymous
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i have recently rebuilt a 1981 360, bored .30 over with 4.00" stroke crank, performer intake with 650 4bbl carb i have a beast 284 cam w/.480 lift can the stock 360 heads support that cam, i know most of you rebuild cars this however is in a 4x4 truck with 3.55 gear ratio and a granny low 4-speed
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Re: 284 cam in 360
#226446
02/17/09 01:54 AM
02/17/09 01:54 AM
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Thanks for the imput not sure about the rotators but ill check it out, thanks again
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Re: 284 cam in 360
[Re: MoparforLife]
#226447
02/17/09 08:56 AM
02/17/09 08:56 AM
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Joined: Sep 2006
Posts: 1,139 West Tennessee
rbstroker
super stock
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super stock
Joined: Sep 2006
Posts: 1,139
West Tennessee
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Moparforlife, Thats the kind of times I am hoping to run with a 2900# car. Can you give some more engine specs? What year engine did you use and what pistons did you have? 2.02 valves?
This is the land of the free
because of the brave
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Re: 284 cam in 360
[Re: MoparforLife]
#226449
02/18/09 02:53 AM
02/18/09 02:53 AM
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well first off im ashamed to admit that some of the stuff your talking about i have no clue but heres what i know, its a "81" 360 with a golden eagle crank with 4.00 stroke, speed pro hypernuematic flat top pistons .020 oversized, performer rpm intake with a holley 670 truck avenger carb, headers, i didnt have enough funds to buy high performance heads so i went with stock heads "81" as well but i have the larger cam now and was unsure if those heads would work, i was told that the stock springs would work but im not to sure bout that so thats why im asking, and like previously mentioned this is a 4x4 pickup that i off road with and do hill climbs and mud boggs,but dont get me wrong i love drag racing and when it comes to engines you are the guys who know what they are talking about not store owners who is told me that stock 360 heads and valve train would work although my cam would be pushing the limits because stock springs will handle .50 lift, im not very smart when it comes to cylinder heads ive never dealt with them before
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Re: 284 cam in 360
#226450
02/18/09 03:01 AM
02/18/09 03:01 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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take your valve cover off and look at the spring retainers...
if the intake and exhaust valve spring retainers look the same...you are ok...
if they look different...you probably have what is call rotators instead of regular valve spring retainers..
those need to be replaced with regular retainers.
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: 284 cam in 360
[Re: 70AARcuda]
#226451
02/19/09 09:23 AM
02/19/09 09:23 AM
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i do not have rotators, both intake/exhaust look the same. i have also been told that the stock valve train would handle my cam stock springs and everything since there was no rotators. and then some one else said that for a larger cam i needed new pushrods,springs, retainers, new lifters pretty much everything had to be upgraded, if i stick with the stock springs what will happen, and when i am looking for new springs how do i tell if they can handle 444/467 gross lift w/ 288/298 adv. duration
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Re: 284 cam in 360
[Re: 70AARcuda]
#226452
02/19/09 09:42 AM
02/19/09 09:42 AM
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first off i want to thank you for your imput, i am trying to rebuild this engine while being deployed here in iraq with the army, and no thats not all i do while im here its just what im doing on my "down time" to relax and it has turned out to be not so relaxing trying to coordinate purchasing, shipping, receiving, and assembly via the telephone or e-mail and ensuring that everything is there and will work without being there has become a difficult task not that i am finishing up the heads, i have never rebuilt heads nor have i installed larger cams with out high performance heads which were already set up for high performance cams so i appologize for so many questions but im tired of getting ran around by local mechanics and dealers who for the most part dont know any more than i do which is why im asking you guys first hand who have learned what will and what wont through experiance
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Re: 284 cam in 360
#226453
02/19/09 09:45 AM
02/19/09 09:45 AM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
first off i want to thank you for your imput, i am trying to rebuild this engine while being deployed here in iraq with the army, and no thats not all i do while im here its just what im doing on my "down time" to relax and it has turned out to be not so relaxing trying to coordinate purchasing, shipping, receiving, and assembly via the telephone or e-mail and ensuring that everything is there and will work without being there has become a difficult task not that i am finishing up the heads, i have never rebuilt heads nor have i installed larger cams with out high performance heads which were already set up for high performance cams so i appologize for so many questions but im tired of getting ran around by local mechanics and dealers who for the most part dont know any more than i do which is why im asking you guys first hand who have learned what will and what wont through experiance
Here is what a rotater looks like. 2nd pic. Here is what can happen with using too short of a valve spring without enough travel for the lift. This was using a cam with 474.485 lift causing coil bind with the stock springs that the cam company told me would be fine. Always check for yourself. It also took the cam and had to sleeve one cylinder along with the head.
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Re: 284 cam in 360
[Re: MoparforLife]
#226454
02/19/09 10:24 AM
02/19/09 10:24 AM
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once again another question, i know what your thinking just get a set of performance heads and shut up already, like previously mentioned im ordering everything online so all i get on valve spring information is pressure and install height,and compressed height, how do you know what the springs can handle by that information, and with the stock 360 heads, if i put upgraded springs will the stock non-adjustable rocker arm shafts and rocker arms work if the upgraded springs have a higher pressure rating and more travel
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Re: 284 cam in 360
[Re: MoparforLife]
#226456
02/19/09 12:40 PM
02/19/09 12:40 PM
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Thank You very much that should wrap it up
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Re: 284 cam in 360
#226457
02/19/09 07:42 PM
02/19/09 07:42 PM
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Joined: Sep 2004
Posts: 2,093 oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Stock springs would not have enough pressure for a performance cam.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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