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Search took 0.03 seconds. Search: Posts Made By: Rar_421
Forum: Pontiac - Street 08-27-2023, 06:58 PM
Replies: 28
Views: 1,806
Posted By steve25
The last set of Buick heads I was porting a...

The last set of Buick heads I was porting a thought for sure I had found a crack so I stopped.

The owner then took the head to get Mag tested and it showed zip.
Forum: Pontiac - Street 08-27-2023, 06:25 PM
Replies: 28
Views: 1,806
Posted By LM93
Dye penetrant tests can find defects too fine for...

Dye penetrant tests can find defects too fine for Mag tests, but they need a smooth surface to not hold dye. Sanding stone will work great.
Forum: Pontiac - Street 08-27-2023, 06:16 PM
Replies: 28
Views: 1,806
Posted By Sirrotica
If there is a crack, and it's hard to see, all...

If there is a crack, and it's hard to see, all you need to do is heat it with a propane torch. As the metal expands the crack will usually widen, allowing you to see it more easily.

From your...
Forum: Pontiac - Street 08-27-2023, 06:12 PM
Replies: 28
Views: 1,806
Posted By Sirrotica
If there is a crack, and it's hard to see, all...

If there is a crack, and it's hard to see, all you need to do is heat it with a propane torch. As the metal expands the crack will usually widen, allowing you to see it more easily.

From your...
Forum: Pontiac - Street 08-27-2023, 06:10 PM
Replies: 28
Views: 1,806
Posted By steve25
Even if you only have a small Dremel tool with a...

Even if you only have a small Dremel tool with a stone polish up that area as it can help make
Cracks show up better.
Forum: Pontiac - Street 08-27-2023, 06:05 PM
Replies: 28
Views: 1,806
Posted By LM93
Shine a flashlight at different angles to see If...

Shine a flashlight at different angles to see If you can find a shadow. Scratches reflect light, cracks don't. The machinist may have found the crack by magnaflux test, and I have seen false...
Forum: Pontiac - Street 08-23-2023, 01:22 PM
Replies: 25
Views: 2,405
Posted By Jay S
12 bolts are 8.875” ring gear 10 bolts...

12 bolts are 8.875” ring gear


10 bolts come in a couple different configurations and are all different.
8.5” 10 bolt, 8.5” ring gear, uses a pinion design from a 12 bolt

10 bolt chevy...
Forum: Pontiac - Street 08-22-2023, 09:22 AM
Replies: 19
Views: 863
Posted By Stan Weiss
Steve, Can you post your math? Stock 350...

Steve,
Can you post your math?

Stock 350 bore, stroke, with (79.5 cc + 4 cc + 9.4 cc = 92.9 cc) 92.9 cc total volume would be 8.8:1 CR. ► (92.9 + 724.7) / 92.9 = 8.80086

9.3:1 would needed a...
Forum: Pontiac - Street 08-21-2023, 05:29 PM
Replies: 28
Views: 1,806
Posted By PunchT37
No, not common. Especially on a ‘68 350.

No, not common.

Especially on a ‘68 350.
Forum: Pontiac - Street 08-06-2023, 06:26 PM
Replies: 11
Views: 476
Posted By steve25
If the gasket match to the RA4 port size on your...

If the gasket match to the RA4 port size on your 17 castings was not carried out 2 or more inches into the runner then your really not picking up much additional flow that the stock D port manifold...
Forum: Pontiac - Street 01-29-2023, 06:36 PM
Replies: 2
Views: 459
Posted By Formulabruce
90cc

90cc
Forum: Pontiac - Street 12-29-2021, 10:17 PM
Replies: 8
Views: 1,636
Posted By Will
That'll be a pretty mild cam. Similar to factory...

That'll be a pretty mild cam. Similar to factory 068 @ .050". Strong lower-midrange power, done by 5000-5200 RPM.
Forum: Pontiac - Street 12-29-2021, 02:24 AM
Replies: 8
Views: 1,636
Posted By Stan Weiss
Less seat duration, just about the same 0.050"...

Less seat duration, just about the same 0.050" duration and more lift than the Pontiac 524886 cam.

Stan
Forum: Pontiac - Street 12-29-2021, 12:56 AM
Replies: 8
Views: 1,636
Posted By ponyakr
Looks pretty good to me. Looks similar to a...

Looks pretty good to me.

Looks similar to a small Voodoo.

https://www.lunatipower.com/voodoo-hydraulic-flat-tappet-cam-pontiac-v8-256-262.html

Should make lots of low & mid range power.
...
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