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Old 02-05-2013, 08:43 PM
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Which Camshaft is better for the Street on a chevy 383?

XR258HR .480/.487 lift, LSA 110 1000-5000RPM

XR264HR .487/.495 lift, LSA 110 1200-5200RPM

XR270HR .495/.502 lift, LSA 110 1600- 5400RPM



I was wondering would the smaller camshaft give me better street manners at a lower RPM but i never planned on using the RPM past 5500... Or do you think that all these camshafts would perform very similar with each other?

Also its for 1978 chevy truck big ten, has 22 in wheels with low profile tires (265/35/22), will have a 700r4, has 3.42 gears (might upgrade to a 3.73 in the near future) and i will use the edelbrock rpm cylinder heads 64cc with a 185 intake runner and a 9.5 compression ratio... my driving nature is cruising from time to time then when im on the highway i either cruise or drive like a getaway driver and possibly a little stop light racing but nothing too big... this engine will be a street engine only no strip or track... this so far is my biggest set back...

also check out this website that uses two of the three camshafts listed above... 383 Chevy Engine - The Ultimate 'Stick

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Old 02-05-2013, 09:23 PM
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I would use the xr 270 in a truck. You as a driver have to determine best what suits you. I would use that same cam in a 283 in a small car,,,,
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Old 02-05-2013, 09:24 PM
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with low compression and high gears with no stall use the smaller cam.
the taller wheels and tires will change the ratio as well, the engine isn't going to build big hp with what's inside of it, so do yourself a favor and use the smaller cam.
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Old 02-05-2013, 09:34 PM
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prumora,could you show me the math on your idea please?
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Old 02-05-2013, 09:56 PM
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all 3 cams have a lda of 110 and 4 advance on the intake side
XR258HR this cam would make peak power at 4000 rpm or less
XR270HR would at least make power to 5k or a bit more in a "383" this would get the engine over 400 hp and make great torque from 1800 rpm up,the 258 cam would likely be under 400 hp ,may as well build a 350
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Old 02-06-2013, 01:10 AM
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Which Camshaft is better for the Street on a chevy 383?

Well there isn't that much difference in any of the cams. If I were buying the cam for my 383 ci I would purchase the XR264HR .487/.495 lift, LSA 110 1200-5200RPM. Recommended gear ratio 3.23-3.73. Stock converter.
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Old 02-06-2013, 11:31 AM
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Quote:
Originally Posted by demarques_191 View Post
XR258HR .480/.487 lift, LSA 110 1000-5000RPM

XR264HR .487/.495 lift, LSA 110 1200-5200RPM

XR270HR .495/.502 lift, LSA 110 1600- 5400RPM



I was wondering would the smaller camshaft give me better street manners at a lower RPM but i never planned on using the RPM past 5500... Or do you think that all these camshafts would perform very similar with each other?

Also its for 1978 chevy truck big ten, has 22 in wheels with low profile tires (265/35/22), will have a 700r4, has 3.42 gears (might upgrade to a 3.73 in the near future) and i will use the edelbrock rpm cylinder heads 64cc with a 185 intake runner and a 9.5 compression ratio... my driving nature is cruising from time to time then when im on the highway i either cruise or drive like a getaway driver and possibly a little stop light racing but nothing too big... this engine will be a street engine only no strip or track... this so far is my biggest set back...

also check out this website that uses two of the three camshafts listed above... 383 Chevy Engine - The Ultimate 'Stick
If your static compression ratio is 9.5, the dynamic CR would be below 7:1 w/the 270 cam. That cam mean a significant and unnecessary loss of power from what the cam could make w/more compression.
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Old 02-06-2013, 11:56 AM
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270 cam

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Originally Posted by cobalt327 View Post
If your static compression ratio is 9.5, the dynamic CR would be below 7:1 w/the 270 cam. That cam mean a significant and unnecessary loss of power from what the cam could make w/more compression.
what are you using for intake closing ?
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Old 02-06-2013, 12:07 PM
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Nevermind, it's closer to 7.8, that is if comp uses an IC on the seat on their cam card.
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Old 02-06-2013, 02:59 PM
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Quote:
Originally Posted by cdminter59 View Post
Well there isn't that much difference in any of the cams. If I were buying the cam for my 383 ci I would purchase the XR264HR .487/.495 lift, LSA 110 1200-5200RPM. Recommended gear ratio 3.23-3.73. Stock converter.
Ya know.383's do like you to lean on the exhaust side a little bit.Just a thought to throw on the pile.
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Old 02-06-2013, 05:14 PM
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there seem to be alot of different opinions and its a street motor, your saying the XR270HR isnt a good cam for the 383 with 9.5 compression? There was a site that compares all of the xtreme camshafts with 9.25 compression



http://www.strokerengine.com/CompCams.html take a look and you tell me what you guys think
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Old 02-06-2013, 05:25 PM
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Quote:
Originally Posted by demarques_191 View Post
there seem to be alot of different opinions and its a street motor, your saying the XR270HR isnt a good cam for the 383 with 9.5 compression? There was a site that compares all of the xtreme camshafts with 9.25 compression



http://www.strokerengine.com/CompCams.html take a look and you tell me what you guys think
Your CR is OK w/the XR270.
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Old 02-06-2013, 05:43 PM
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compare apples to apples

Quote:
Originally Posted by demarques_191 View Post
there seem to be alot of different opinions and its a street motor, your saying the XR270HR isnt a good cam for the 383 with 9.5 compression? There was a site that compares all of the xtreme camshafts with 9.25 compression



http://www.strokerengine.com/CompCams.html take a look and you tell me what you guys think
look at the heads they are using.ouch,for power,,,,
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Old 02-06-2013, 06:05 PM
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I don't know what's a 'stroker' about a 0.030" over sbc 400 (406 in other words), either.
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Old 02-07-2013, 06:12 AM
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@vinnie right lol and imagine putting some good flowing heads how much power you can ahieve then lol
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