#1  
Old 10-27-2019, 10:22 PM
marxjunk marxjunk is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: KANSAS CITY KANSAS.....
Posts: 3,851
Default 425A trophy motor

I need some help..new territory for me..Ive never owned an older 389 and now have one..I want to use the block and rotating assy, its a stick motor...can some one tell me or link me up to what it takes or if its even possible to run a 65 up top end...

__________________
Mark..

The Goat whisperer

"I spent a lot of my money on booze, crazy women, and fast cars. The rest I just squandered."

  #2  
Old 10-27-2019, 10:26 PM
tom s tom s is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: long beach ca usa
Posts: 18,764
Default

Are you going to use it in a 61-63 tempest?The only issue for the top end is what year heads you use on your early block.The valve angles were changed in 67.Tom

  #3  
Old 10-27-2019, 11:34 PM
marxjunk marxjunk is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: KANSAS CITY KANSAS.....
Posts: 3,851
Default

Yes a 63...

I need to pull it apart i guess

__________________
Mark..

The Goat whisperer

"I spent a lot of my money on booze, crazy women, and fast cars. The rest I just squandered."

  #4  
Old 10-28-2019, 09:12 AM
Radman's Avatar
Radman Radman is offline
Chief Ponti-yacker
 
Join Date: Jan 2010
Location: Tippecanoe, OH
Posts: 765
Default

Newer heads should bolt to the block. One note 63 and older heads have the 12 bolt intake, the 64 and up should be 10 bolt intake manifold.

__________________
If you built it, drive it.
red 62 Tempest total stock restoration.
white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train.
  #5  
Old 10-28-2019, 01:12 PM
Rocco Testa's Avatar
Rocco Testa Rocco Testa is offline
Senior Member
 
Join Date: Dec 1999
Location: Warwick New York
Posts: 181
Default

64 Blocks use the older 12 bolt manifold and it's different that the (65-79) manifolds? (61-64 )That said if you want to run newer open chamber heads or new Aluminum, heads you really need to do a piston change for the valve angles. I know some guys run the new heads on the older blocks without the piston change but I wouldn't. Push rods are different and all valve geometry will be off. In my book its a No No.

  #6  
Old 10-28-2019, 02:01 PM
tom s tom s is offline
Ultimate Warrior
 
Join Date: Jan 2000
Location: long beach ca usa
Posts: 18,764
Default

Just run 65-66 heads AND intake manifold and you will have no issue!Tom

The Following User Says Thank You to tom s For This Useful Post:
  #7  
Old 10-28-2019, 04:58 PM
Rocco Testa's Avatar
Rocco Testa Rocco Testa is offline
Senior Member
 
Join Date: Dec 1999
Location: Warwick New York
Posts: 181
Default

Tom is correct, but you will have high compression and may need more then 93 octane fuel. You could also get custom head gaskets to lessen the effect of the lower octane fuel. My 64 with the 716 heads will just about ping with 93 plus booster. If your on the east and north coast you can get 93 fuel. If your on the west I don't think its available but I maybe wrong and I'm not sure about the south.

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 09:22 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017