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08-21-2009, 08:14 PM
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#1 |
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Senior Member
 
Join Date: Jul 2009
Location: Exeter, NH
Posts: 786
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Am I happy or sad?
I just discovered the 350 engine in my truck has 305 heads. What is the advantage/disadvantage or reason ???
Thanks Last edited by mikey531; 08-21-2009 at 08:20 PM. |
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08-21-2009, 08:53 PM
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#2 |
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Formerly- 1972SuperCheyenne
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: Am I happy or sad?
Most of the 305 heads had smaller combustion chambers. Effectively raising your compression ratio. Unfortunately most of them wont flow enough for you to ever see a performance gain. Cant imagine it hurting anything if you are just driving around.
__________________
--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
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08-21-2009, 08:55 PM
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#3 |
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Gearhead and audio junkie
Join Date: Aug 2008
Location: nunyah
Posts: 452
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Re: Am I happy or sad?
Well they don't flow very well and they're usually low compression 76cc smogger heads.Go find a pair of vortecs and GO!!!!
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08-21-2009, 09:03 PM
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#4 | |
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Registered User
Join Date: Mar 2009
Location: Central Texas
Posts: 140
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Re: Am I happy or sad?
Quote:
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08-21-2009, 09:34 PM
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#5 |
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blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: Am I happy or sad?
you must be happy. you have small chambers shrouding the flow in and out, small ports keeping large amounts of air at bay, high compression making you use costlier fuel, and thinner casting to shave weight.
I am extremely happy with my ultra low-buck 1992 TBI heads. |
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08-21-2009, 09:58 PM
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#6 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,233
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Re: Am I happy or sad?
u sure the whole motor isn't a 305?
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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08-21-2009, 10:01 PM
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#7 | |
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Still livin the "dream" in '54
Join Date: Nov 2006
Location: Tucson, AZ
Posts: 2,656
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Re: Am I happy or sad?
Quote:
 I just tell people I have a dyslexic 350! D
__________________
Current build. 1954 Chevrolet 3800 "Ella" SOLD! My '67 stepper "Tangerine Dream" "Anything worth doing is worth doing right" James Dean “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” Sherlock Holmes "There is no spoon." Neo Last edited by Richard8971; 08-21-2009 at 10:02 PM. |
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08-21-2009, 10:04 PM
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#8 |
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Still livin the "dream" in '54
Join Date: Nov 2006
Location: Tucson, AZ
Posts: 2,656
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Re: Am I happy or sad?
I have heard of people doing this, but usually you have to have larger valves installed. Without looking at your heads, it's difficult to know if the person who installed them put larger valves in. But usually they do this to increase compresson.
D
__________________
Current build. 1954 Chevrolet 3800 "Ella" SOLD! My '67 stepper "Tangerine Dream" "Anything worth doing is worth doing right" James Dean “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” Sherlock Holmes "There is no spoon." Neo |
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08-21-2009, 10:18 PM
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#9 | |
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Gearhead and audio junkie
Join Date: Aug 2008
Location: nunyah
Posts: 452
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Re: Am I happy or sad?
Quote:
flow bad with high compression to burn cleaners or something ,tiny CC right? like 58 cc cause the pistons on most 305's are pretty far down in the hole at TDC? all i know is that they don't flow well haha |
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08-21-2009, 10:54 PM
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#10 | |
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Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: Am I happy or sad?
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08-22-2009, 12:05 AM
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#11 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Am I happy or sad?
could be worse... you could have a dodge and need a tranny
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08-22-2009, 12:49 AM
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#12 |
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Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: Am I happy or sad?
305 heads should be good to about 4000 RPM, so its not that bad of thing
It does raise your compression quite a bit, like to 10 or 11:1 So you may need to run premium to keep it from detonating Combustion chambers are 58cc & they have 184 intake / 150 exhaust valves |
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