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Forum: Pontiac - Street 12-08-2022, 01:11 PM
Replies: 62
Views: 7,146
Posted By Jay S
I always recall the highest pumping numbers. If...

I always recall the highest pumping numbers. If the earlier pump test a few years ago was cold (which I overlooked), and the last one was hot. I don’t think much info to be learn from the...
Forum: Pontiac - Street 12-08-2022, 12:45 PM
Replies: 62
Views: 7,146
Posted By Jay S
Stan, I came up with similar numbers you did. I...

Stan, I came up with similar numbers you did. I think the compression is a fair amount higher than 10:1, and the actual intake closing is in the mid to upper 70s. With the miles on the engine I...
Forum: Pontiac - Street 12-08-2022, 12:17 PM
Replies: 62
Views: 7,146
Posted By Jay S
If some of the change in cranking compression...

If some of the change in cranking compression from the 150-155 range in summer of 2020 (mentioned earlier in the thread) to the more recent 175-185 this fall came from carbon build up. The seafoam...
Forum: Pontiac - Street 12-07-2022, 12:42 AM
Replies: 62
Views: 7,146
Posted By Jay S
IMHO, the plug is saying it would like to be...

IMHO, the plug is saying it would like to be colder. I run 43s up to about 10:1, a 43 can be run with higher compression than that depending on how the engine is set up. We run often run colder...
Forum: Pontiac - Street 12-06-2022, 09:58 AM
Replies: 62
Views: 7,146
Posted By Jay S
Plugs look like they are a coupe heat ranges too...

Plugs look like they are a coupe heat ranges too hot. (Strap burnt nearly down to the base). Hard to tell color sometimes from a photo and not natural sun light, but looks like it is running fairly...
Forum: Pontiac - Street 11-06-2022, 11:19 AM
Replies: 62
Views: 7,146
Posted By Jay S
I did 91 octane pump gas 64 389 engine with flat...

I did 91 octane pump gas 64 389 engine with flat tops, stock 716 heads, and log manifolds earlier this year. It would be great to know what the Erson cam is in the last 389 example.

My highest...
Forum: Pontiac - Street 11-04-2022, 04:57 PM
Replies: 62
Views: 7,146
Posted By Jay S
Those numbers with the cam the engine has are...

Those numbers with the cam the engine has are indicating the compression is closer to 10:1 than 11:1. The octane blend you have been running calculates out to be about 95. Appears you have some...
Forum: Pontiac - Street 11-02-2022, 08:56 PM
Replies: 62
Views: 7,146
Posted By Jay S
Some guys unshroud the chambers to around 76 cc. ...

Some guys unshroud the chambers to around 76 cc. Here is a thread you can look thru that talks about that. See post 24.
...
Forum: Pontiac - Street 11-02-2022, 06:16 PM
Replies: 62
Views: 7,146
Posted By Jay S
389 has smaller valve reliefs than the later...

389 has smaller valve reliefs than the later engines. Less than 6.7 cc. Maybe 4? It probably is almost 11:1
Forum: Pontiac - Street 11-02-2022, 04:51 PM
Replies: 62
Views: 7,146
Posted By Jay S
The .060” Cometic head gasket would not change...

The .060” Cometic head gasket would not change the static compression enough to be worth the time, it might even run worse.

I think it would take a minimum of a .090” thick Cometic to have any...
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