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Old 05-09-2008, 02:37 PM
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350 heads or 305 heads...???

yes i have 350 heads (14102183) and 305 heads (14101081) and i wanted to know wich ones will run better both being ported a little bit and both having 1.94in and 1.6 in a 350 sbc bored 40 over, flat top piston with performer rpm intake and 280h comp cam...???any recomendations...
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Old 05-09-2008, 04:45 PM
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wat cc are both the heads
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Old 05-09-2008, 04:56 PM
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Both these come with 1.84" Intake & 1.50" Exhaust. The 1081 are 58cc Chambers. The 2183s I couldn't find may be 2193 but didn't show the cc. Should be pretty equal if they both have the same cc Chambers
http://www.chevymania.com/partsid/pa...p=head&block=S

Last edited by SSedan64; 05-09-2008 at 04:58 PM. Reason: Forgot link
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Old 05-09-2008, 05:00 PM
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is this your 400? if so i would go with the smallest cc heads for the more compresion too get the milage
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Old 05-09-2008, 06:19 PM
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da 350 heads are 1.94in and 1.5 with 64cc...stock...

da 305 are 1.84in and 1.5 with 58cc...stock...

wich ones are better to use350 heads or 305's for my setup??? (performer rpm intake 6,500,flat top piston,280h comp cam)
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Old 05-09-2008, 07:18 PM
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Quote:
Originally Posted by jkingof9561
da 350 heads are 1.94in and 1.5 with 64cc...stock...

da 305 are 1.84in and 1.5 with 58cc...stock...

wich ones are better to use350 heads or 305's for my setup??? (performer rpm intake 6,500,flat top piston,280h comp cam)
I would use the 081's on your 350. If they are only ported a little bit, you can take that further to get more power. Lots of potential there but a full porting effort is required. Its all about air flow.
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Old 05-10-2008, 01:30 AM
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Is this a drag only, daily driver, street/strip? I'd go with the heads with the larger valves unless you plan to put larger valves in the 305 heads.
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Old 05-10-2008, 01:42 AM
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i want dem for daily driving high performance street/strip...
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Old 05-10-2008, 06:41 PM
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Your 350 64cc heads will be better for street/strip. Larger valves = more flow, The 58cc 305 heads on the larger 350 bore would be too much compression for pump gas. You want 9-9.5 CR to be able to use pump gas without detonation. Racing gas and Octane booster isn't cheap. Hell pump gas isn't either now.
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Old 05-11-2008, 06:10 PM
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Quote:
Originally Posted by SSedan64
Your 350 64cc heads will be better for street/strip. Larger valves = more flow, The 58cc 305 heads on the larger 350 bore would be too much compression for pump gas. You want 9-9.5 CR to be able to use pump gas without detonation. Racing gas and Octane booster isn't cheap. Hell pump gas isn't either now.
The 350 heads he has to work with are the TBI swirl port heads. They have a flow restrictive swirl vane in the intake port that severely limits airflow and power.

The 081 heads once fitted with larger 350 sized valves will have a chamber volume in the low 60's. (slight chamber wall deshrouding is required to clear the larger valve radius) They will flow and perform very well once ported with the larger valves.
Of the two heads he has to work with, the 081's are by far the best choice.
The finished cr will not be excessive.
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Old 05-11-2008, 07:19 PM
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id still take the 305s with 58cc cause on street racin ud come out of the hole like a rocket
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Old 05-11-2008, 11:06 PM
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Quote:
Originally Posted by F-BIRD'88
The 350 heads he has to work with are the TBI swirl port heads. They have a flow restrictive swirl vane in the intake port that severely limits airflow and power.

The 081 heads once fitted with larger 350 sized valves will have a chamber volume in the low 60's. (slight chamber wall deshrouding is required to clear the larger valve radius) They will flow and perform very well once ported with the larger valves.
Of the two heads he has to work with, the 081's are by far the best choice.
The finished cr will not be excessive.
Didn't know those were the swirlports. There absolute junk. Friend of mine built a 90 Chevy van engine with those heads with flat tops. All it would do is detonate/rattle with any timing advance
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Old 05-12-2008, 12:45 AM
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well i been told by some one dat does porting and valve jobs dat da 350 tbi heads are better to use rather dan da 305s...why???cause da 350 heads flow more better once ported and have 1.94in valves wich are bigger dan da 305s 1.84in and dat da head gasgets will burn with time passing and after dat you will have a crossfire in wit pistons...so i no dat 305 heads work gud wit torque and throtle response but i want sumting for daily driving and to be running wit da best fuel economy i can have...but not worried about gas rite now...i just want to be running like a high to mid 11 with all of my setup and tranny...on a 3333lb car...

is there any hope with da 350 heads once fully customized...???

are they capable of making enough hp to be running a high-mid 11's once fully ported...???

thanks jerry
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Old 05-12-2008, 12:53 AM
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and da 350 heads i had them running once in almost da kind of setup without porting,cam and performer rpm intake...

i had da 350 tbi heads running with just performer intake,600cfm carb,stock chevy roller cam,no headers...and stock 700r4 tranny out of a van...and i was running like a low 14 quarter mile in a trans am...

but my question is...can they handle cam,performer rpm intake once fully ported with 1.94in and 1.5ex...???
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