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Forum: Pontiac - Street 12-19-2022, 08:00 PM
Replies: 39
Views: 3,585
Posted By 25stevem
Here’s some of HO racings recommendations for...

Here’s some of HO racings recommendations for cams to be used with high comp heads.

Note in particular what they call out for the minimum gearing in comparison to the cam duration.
Forum: Pontiac - Street 12-12-2022, 07:19 AM
Replies: 39
Views: 3,585
Posted By 25stevem
Phil, are you talking about a stock 400 and if so...

Phil, are you talking about a stock 400 and if so what heck year?
Forum: Pontiac - Street 12-11-2022, 07:11 AM
Replies: 39
Views: 3,585
Posted By 25stevem
Comp cams has Lobes in there Magnum series that...

Comp cams has Lobes in there Magnum series that are very close.
230@.050” .480” with 1.5
236@.050 .490” with 1.5

You should ring them up and see if they have a core to grind you one up on with...
Forum: Pontiac - Street 12-09-2022, 07:19 AM
Replies: 39
Views: 3,585
Posted By 25stevem
Since you have found proof that whoever stuffed...

Since you have found proof that whoever stuffed that Cam in did not know what they where doing and likely had the geometry off, first pull the heads and take the valves out so you can check the...
Forum: Pontiac - Street 12-07-2022, 04:29 PM
Replies: 39
Views: 3,585
Posted By 25stevem
Here’s what your dealing with if the head is...

Here’s what your dealing with if the head is totally stock.

The uncut valve guide height is about .670”.

With a stock valve and stock retainer that accepts the valve seal O-ring you have .560”...
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