305 Vortec heads VS 350 Vortec's - Chevelle Tech
Engine AdvertisementGeneral Engine Discussion.

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old Feb 4th, 10, 8:08 PM Thread Starter
Tech Team
Patrick
 
Join Date: Aug 2008
Location: Quitman Georgia
Posts: 246
305 Vortec heads VS 350 Vortec's

A customer brought me 2 engines. One is a 97 5.7 Vortec with the popular "906" heads and the other one is a "reman" 97 5.0 with these heads:
12558059...97......305..........Vortec, truck, 1.84"/1.5" valves

I am rebuilding the 5.7 but the owner is trying to save a few bucks and told me if the 305 heads are in better condition to use them.
Would it be ok to use the 305 heads? Would there be any hp loss or gain? I don't know the combustion chamber size of them.

69RS/SS,383,10.25:1cr,4.10,60ft1.6sec,1/8-7.6sec@88mph,1/4-12.1@110mph,Vicjr.intake,RPMheads,mildport,750dp, Proform main body, cam,246*-250*@.050,.510,522lift,1.6rr,700r4,3200stall
Engine is SOLD
Building a 489BBC!
Speedfreek is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Feb 4th, 10, 9:01 PM
Jason
 
Join Date: Feb 2009
Location: Traverse City MI
Posts: 24
Re: 305 Vortec heads VS 350 Vortec's

use the 350 heads.
Onebadbowtie86 is offline  
post #3 of 8 (permalink) Old Feb 4th, 10, 9:11 PM
Team Member
Jake
 
Join Date: Nov 2007
Location: Louisiana
Posts: 7,567
Re: 305 Vortec heads VS 350 Vortec's

059s are small chamber...less than 60 I think. They aren't true "swirl ports", so they're not terrible. I guess it depends on the pistons, right?

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
Highway Star is offline  
post #4 of 8 (permalink) Old Feb 5th, 10, 6:02 AM
Senior Tech Team
Derrick
 
Join Date: Feb 2002
Location: Howard Lake, MN, USA
Posts: 18,841
Re: 305 Vortec heads VS 350 Vortec's

while they aren't as good as the vortec 350 heads, the vortec 305 heads were good enough to help make a '96 305 more powerful and fuel efficient than a '95 350.

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
novaderrik is online now  
post #5 of 8 (permalink) Old Feb 5th, 10, 6:09 AM Thread Starter
Tech Team
Patrick
 
Join Date: Aug 2008
Location: Quitman Georgia
Posts: 246
Re: 305 Vortec heads VS 350 Vortec's

Would there be any noticible hp loss? He said he would sell me the 906's cheap if we decided to use the 305 heads.

69RS/SS,383,10.25:1cr,4.10,60ft1.6sec,1/8-7.6sec@88mph,1/4-12.1@110mph,Vicjr.intake,RPMheads,mildport,750dp, Proform main body, cam,246*-250*@.050,.510,522lift,1.6rr,700r4,3200stall
Engine is SOLD
Building a 489BBC!
Speedfreek is offline  
post #6 of 8 (permalink) Old Feb 5th, 10, 7:44 AM
Senior Tech Team
 
Join Date: Dec 1998
Location: Lubbock, TX
Posts: 3,812
Re: 305 Vortec heads VS 350 Vortec's

The world is full of folks that would run the con and install the 305 heads on the guys' motor just to get the Vortec heads cheap.
The Vortecs are a much better head, but the 305 heads are still probably a lot better than what was available during the smogger era.

Gary Adrian
The correct spelling is
HILLIARY
Busted Knuckles is offline  
post #7 of 8 (permalink) Old Feb 6th, 10, 6:08 AM Thread Starter
Tech Team
Patrick
 
Join Date: Aug 2008
Location: Quitman Georgia
Posts: 246
Re: 305 Vortec heads VS 350 Vortec's

Quote:
Originally Posted by Busted Knuckles View Post
The world is full of folks that would run the con and install the 305 heads on the guys' motor just to get the Vortec heads cheap.
I told the guy the 906's were better heads. He said he didnt care. I'm one of the more honest people out there that would build his engine good just to get him to put out a good word for me and bring me more business.

I will let the machine shop (professional eyes) look at the two and make that decision.

Although I do want those 906's! But I won't do anything wrong to get them.

69RS/SS,383,10.25:1cr,4.10,60ft1.6sec,1/8-7.6sec@88mph,1/4-12.1@110mph,Vicjr.intake,RPMheads,mildport,750dp, Proform main body, cam,246*-250*@.050,.510,522lift,1.6rr,700r4,3200stall
Engine is SOLD
Building a 489BBC!
Speedfreek is offline  
post #8 of 8 (permalink) Old Feb 6th, 10, 7:16 AM
Senior Tech Team
 
Join Date: Dec 1998
Location: Lubbock, TX
Posts: 3,812
Re: 305 Vortec heads VS 350 Vortec's

Quote:
Originally Posted by Speedfreek View Post
I told the guy the 906's were better heads. He said he didnt care. I'm one of the more honest people out there that would build his engine good just to get him to put out a good word for me and bring me more business.

I will let the machine shop (professional eyes) look at the two and make that decision.

Although I do want those 906's! But I won't do anything wrong to get them.
I hope you didn't think I was pointing a finger at you, if you had been one of the "con" guys, your question would never have gotten asked here. Kudos for taking the high road, a lot of folks wouldn't have given it a second thought.

Gary Adrian
The correct spelling is
HILLIARY
Busted Knuckles is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome