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1964 Pontiac 389 heads 9773345 how many cc's

  
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1964 Pontiac 389 heads 9773345 how many cc's

 
Willshire Willshire
New User | Posts: 26 | Joined: 11/10
Posted: 07/15/11
10:36 AM

Anybody know the size of the combustion chambers on the 9773345 heads? i checked the sticky in here but it just gives cr. I have a dynamic cr of about 8.2-8.5 as long as my math is correct. it would be easier to know for sure if i knew the volume of the chambers. Any one got this info? BTW i will be running 94 octane gas  

gto66 gto66
Enthusiast | Posts: 489 | Joined: 11/08
Posted: 07/15/11
11:39 AM

My information shows 1.92/1.66 with 68cc. hope this helps.

Bob  

Willshire Willshire
New User | Posts: 26 | Joined: 11/10
Posted: 07/15/11
12:00 PM

Yep, that's what i thought. Ron's pontiac page has them at 70cc. At 68cc i have 10.2:1 static cr and 8.23:1 dynamic. Seems to me i am running right on the edge for hi test pump gas  

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/15/11
12:33 PM

1963 345 389 cu.in. D-PORT 1.88 1.60 68 CC  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/15/11
12:37 PM

9.5:1Cr is maximum safe limit with iron heads and premium pump gas.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

Willshire Willshire
New User | Posts: 26 | Joined: 11/10
Posted: 07/15/11
01:21 PM

Unfortunately, and you can slap me if you like, i will be running the 10.2:1 static cr. It ran pretty good on 91 with 10.02:1 at 8* base timing. It may be high but i just finished building it before i bent the intake valve ($4k) i think with some adjustmenTS (timing, toluene etc.) it will work out ok. If it blows up i got all winter to fix it lol. Just kidding i will have to play it by ear (literally)  

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/15/11
02:15 PM

Retarding timing, toluene for octane boost this that and the other are all nothing but band aids.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

gto66 gto66
Enthusiast | Posts: 489 | Joined: 11/08
Posted: 07/15/11
03:53 PM

Big +1 pman

Bob  

tuffnuff tuffnuff
Moderator | Posts: 2535 | Joined: 12/09
Posted: 07/16/11
10:54 AM

Good luck with that compression, it might just work out.,. only one way to find out, then tell us about it.
We could all be wrong by suggesting 9.5 as the safe limit.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/16/11
11:24 AM

There was a guy on here a while back that thought it would work and got some info on getting a adjustable vacuum advance and adjusting it down till you could not here detonation and knocking down the timing and got info on all the other band aids as well and it was not all that long he was back on here because the engine needed a rebuild because of engine damage due to detonation even though he could not here any after he performed all the band aid tricks.

Good luck.  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

Willshire Willshire
New User | Posts: 26 | Joined: 11/10
Posted: 07/18/11
01:11 PM

According to Wallace racing This was a d-port 1.92 1.66 70cc head 306hp 10.5:1 cr. Have you guys ever used sce ics titan gaskets? How are they? Looking to have my cr lowered to under 10:1 which will drop my DCR to just under 8:1. For the extra $$$ i think i may take your advice and drop the cr. Your sigs tell me you have done this before  

gto66 gto66
Enthusiast | Posts: 489 | Joined: 11/08
Posted: 07/18/11
06:06 PM

From what I have seen you will get advice from the best. They have alot of experanice and gladly share it!!

Bob  

instg8ter instg8ter
Guru | Posts: 971 | Joined: 10/10
Posted: 07/18/11
06:16 PM

really are not sacrificing that much HP by lowering the CR (think it came out around 8hp on the sim) and your motor will thank you in the "long run"....as it will run longer, on more affordable fuel I have the ICS gaskets and have had no problem with them, make sure to upgrade your head bolts to ARP if you have not done it yet, the copper gaskets can also be re-used without annealing (5 times?) according to ICS, guess that makes up for the crazy cost.  
http://s1098.photobucket.com/albums/g372/instg8ter/1966%20Tempest/

"learning as i go, and going as i learn"

Brian

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/18/11
06:21 PM

Icon Quotegto66:
From what I have seen you will get advice from the best. They have alot of experanice and gladly share it!!

Bob


Thanks buddy  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

Pontiacman8 Pontiacman8
Moderator | Posts: 5771 | Joined: 02/08
Posted: 07/18/11
06:24 PM

Icon Quoteinstg8ter:
really are not sacrificing that much HP by lowering the CR and your motor will thank you in the "long run"....as it will run longer, on more affordable fuel

+1 as a well tuned 9-9.5:1CR Pontiac engine ran on premium pump gas will out perform a detuned higher CR engine that is not seeing the required octane..  
Engine builder,self taught auto body guy.
Horsepower sells engines and torque wins races

Pontiacman8
Pontiacman8
Pontiacman8

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