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Forum: Pontiac - Street 11-20-2023, 04:13 PM
Replies: 53
Views: 2,366
Posted By SD455DJ
78P-T/A - I think the xe262h would be a solid...

78P-T/A - I think the xe262h would be a solid choice for your engine as well as the 2800...maybe the better cam, as it will build cylinder pressure more quickly as designed. You will need new valve...
Forum: Pontiac - Street 11-20-2023, 11:00 AM
Replies: 53
Views: 2,366
Posted By JB Eng Wis
A boost of everthing for the low compression 400 ...

A boost of everthing for the low compression 400
I would recomend you try the Lunati LUN-10510701
I have it in 350 with a baby stall converter, works very good IMO
Forum: Pontiac - Street 11-17-2023, 03:55 PM
Replies: 53
Views: 2,366
Posted By Skip Fix
I put an XE262 on a 112 LS in my original 400...

I put an XE262 on a 112 LS in my original 400 from the 78(180 HP 6x-8 heads 97.5cc) in the 81. The 2801 is every bit as good a cam. And it degreed perfect dot to dot!
Forum: Pontiac - Street 11-17-2023, 03:44 PM
Replies: 53
Views: 2,366
Posted By Stan Weiss
You need to do the cranking compression test on...

You need to do the cranking compression test on all 8 cylinders and then post the result.

Stan
Forum: Pontiac - Street 11-17-2023, 02:26 PM
Replies: 53
Views: 2,366
Posted By Stan Weiss
I have not run neither cam. Looking at the...

I have not run neither cam. Looking at the numbers the XE262 is more aggressive. It has less Adv seat-to-seat duration but more 0.050" duration and more lift than the 60240.

Stan
Forum: Pontiac - Street 11-17-2023, 02:21 PM
Replies: 53
Views: 2,366
Posted By Stan Weiss
JMO It will give you and idea about the state of...

JMO It will give you and idea about the state of your engine and also might help with cam selection.

Stan
Forum: Pontiac - Street 11-17-2023, 01:04 PM
Replies: 53
Views: 2,366
Posted By 78w72
Hard to guess at power, im sure some others can...

Hard to guess at power, im sure some others can make an estimate, some members here have a tool that can estimate HP based on specs.

The stock hp was 180-220 hp on these mid to late 70s 400s, i...
Forum: Pontiac - Street 11-17-2023, 10:37 AM
Replies: 53
Views: 2,366
Posted By 78w72
probably a good idea to replace the valve springs...

probably a good idea to replace the valve springs too since the cam is bigger than stock and the springs on there are almost 30 years old if they were changed when heads were serviced in the 90's......
Forum: Pontiac - Street 11-17-2023, 01:49 AM
Replies: 53
Views: 2,366
Posted By grivera
An XE262H will be a good choice ...

An XE262H will be a good choice
https://butlerperformance.com/i-24453749-comp-cams-xtreme-energy-xe262h-hydraulic-flat-tappet-cam-and-lifter-kitcca-cl-51-222-4.html
Forum: Pontiac - Street 11-16-2023, 10:26 AM
Replies: 53
Views: 2,366
Posted By 78w72
With the 6x-4 heads you can have them milled...

With the 6x-4 heads you can have them milled ~.030 to increase compression some, that will help selecting a new cam that IMO will add more power than just using 1.65 rockers and you can keep the...
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