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Search took 0.04 seconds. Search: Posts Made By: 67Lemons
Forum: Pontiac - Street 09-13-2024, 04:07 PM
Replies: 43
Views: 1,570
Posted By Jay S
That much seat pressure usually requires short...

That much seat pressure usually requires short travels. If you have to run much over 160 it is usually time to run short travels.
Forum: Pontiac - Street 09-07-2024, 07:31 PM
Replies: 16
Views: 734
Posted By Jay S
The pitting on the bearings is from acidic oil...

The pitting on the bearings is from acidic oil sitting in those engines for long periods of time when the engine is not in service.
Forum: Pontiac - Street 09-07-2024, 07:10 PM
Replies: 16
Views: 734
Posted By 67drake
They look similar to the bearings on my ‘69 400....

They look similar to the bearings on my ‘69 400. I pulled it about a month back mainly because the rear main leak was SO bad. Low mileage engine that had no ring ridges. I pulled the pistons without...
Forum: THE LOBBY 09-04-2024, 07:13 PM
Replies: 82
Views: 4,328
Posted By Mr_GTO
https://www.youtube.com/watch?v=O5f5ASA3ptY

https://www.youtube.com/watch?v=O5f5ASA3ptY
Forum: Pontiac - Street 09-04-2024, 04:33 PM
Replies: 13
Views: 513
Posted By steve25
Some visual help.

Some visual help.
Forum: Pontiac - Street 09-04-2024, 03:18 PM
Replies: 13
Views: 513
Posted By Joe's Garage
Factory original valves have a part number on them

Factory valves will normally have a GM part number on them.

Usually stamped on the stem, up near the retainer grooves.

If you disassemble a couple of yours, you will know if they're original.
Forum: Pontiac - Street 09-02-2024, 12:40 PM
Replies: 29
Views: 1,398
Posted By b-man
No way would I spend the money to rebuild a set...

No way would I spend the money to rebuild a set of iron heads unless they were for a correct restoration of a Ram Air, Super Duty or High Output Pontiac performance engine.

A stock 400 or 389 GTO...
Forum: Pontiac - Street 09-01-2024, 06:44 PM
Replies: 13
Views: 513
Posted By SD455DJ
I forgot to mention that it cost $95 back in 2019...

I forgot to mention that it cost $95 back in 2019 to have the pins installed, so maybe $125 - $150 today...?

Dennis
Forum: Pontiac - Street 09-01-2024, 12:03 PM
Replies: 13
Views: 513
Posted By SD455DJ
I have 2 sets of "pinned pressed-in stud" heads,...

I have 2 sets of "pinned pressed-in stud" heads, one is a set of '70 #15's (like yours) and the other is a set of '70 #16's. The #15"s were on a 455 with a Summit 2802 cam (224/234/114 @ .466"/.488"...
Forum: Pontiac - Street 09-01-2024, 12:20 AM
Replies: 13
Views: 513
Posted By Formulabruce
you can have the studs "Pinned" if you are...

you can have the studs "Pinned" if you are worried, and thats cheap compared to a head work over. I have used 15 heads with big valves installed ( makes a 70HO head) and loved them.
Forum: Pontiac - Street 08-31-2024, 09:57 PM
Replies: 13
Views: 513
Posted By Rar_421
Why not just go through the 15's? Any factory...

Why not just go through the 15's? Any factory head is going to need the guides cut down for positive seals any way,unless you want to stay with a factory low lift cam
Forum: Pontiac - Street 08-31-2024, 11:12 AM
Replies: 13
Views: 513
Posted By steve25
There a hair over 6 and the deck height has...

There a hair over 6 and the deck height has always been .020” to .025”.

Of course your Rod center to center length will affect this.

Don’t forget to add 1.5 CCs for top ring land volume and the...
Forum: Pontiac - Street 08-27-2024, 04:53 PM
Replies: 15
Views: 894
Posted By b-man
Thumbs up Motor Trend article by Roger Huntington on the...

Motor Trend article by Roger Huntington on the new 1963 421 HO, identical to the 1964 version.

https://over-drive-magazine.com/wp-content/uploads/2022/09/1963-03-MT-Pontiac-421-HO-1-5.pdf

Quite...
Forum: Pontiac - Street 08-26-2024, 09:11 PM
Replies: 15
Views: 894
Posted By SD455DJ
Bart, The W72 was dyno'd with 93 E10 pump gas....

Bart, The W72 was dyno'd with 93 E10 pump gas. Dan dyno'd another W72 400 a few years earlier and found that made the most power at 42 degrees advance, so he just kept that for all the pulls. It's...
Forum: Pontiac - Street 08-26-2024, 08:02 PM
Replies: 15
Views: 894
Posted By SD455DJ
Here is my brother Dan's '408' build and dyno...

Here is my brother Dan's '408' build and dyno session story below. Note that the compression with shaved 6X-4's is only 8.75 to 1, but it still made great power with a 2800 cam.

Dan rebuilt the...
Forum: Pontiac - Street 08-23-2024, 10:00 AM
Replies: 15
Views: 894
Posted By steve25
Your rear gears should be considered in your cam...

Your rear gears should be considered in your cam pick also.
I hate to say it, but the truth is that the gain in intake flow that you will pick up by means of the 6X heads bigger intake will not...
Forum: Pontiac - Street 08-23-2024, 09:13 AM
Replies: 15
Views: 894
Posted By steve25
Without running the numbers I agree with the...

Without running the numbers I agree with the above, numbers in post 3, no better than 8.5.

Since the 6X-4 heads sound like they have had a valve job when you CC them you find no smaller then 91...
Forum: Pontiac - Street 08-23-2024, 09:09 AM
Replies: 15
Views: 894
Posted By johnta1
Duh! I used my 455 specs! Jay is...

Duh!

I used my 455 specs!

Jay is correct.

:p
Forum: Pontiac - Street 08-23-2024, 08:26 AM
Replies: 15
Views: 894
Posted By Jay S
8.2 to 8.5 in a 400 with stock stroke and...

8.2 to 8.5 in a 400 with stock stroke and pistons.

Mid 9s with 4.21 or 4.25 cranks and flat tops
Forum: Pontiac - Street 08-23-2024, 08:19 AM
Replies: 15
Views: 894
Posted By johnta1
Around 9.5-9.7 cr :)

Around 9.5-9.7 cr


:)
Forum: Pontiac - Street 08-14-2024, 05:48 PM
Replies: 31
Views: 978
Posted By b-man
This. Not to mention some of those ‘68 -‘70...

This.

Not to mention some of those ‘68 -‘70 350 heads are missing the 2 outer exhaust manifold bolt holes.

6X-4 or if you can’t find those 5C-4 for the win! :)
Forum: Pontiac - Street 08-14-2024, 05:40 PM
Replies: 31
Views: 978
Posted By steve25
Buying a set of heads that already have screw in...

Buying a set of heads that already have screw in studs will save you on todays shop cost well over 300 bucks in the cost of drilling and taping heads for screw in studs and then you tack onto the...
Forum: Pontiac - Street 08-14-2024, 05:23 PM
Replies: 31
Views: 978
Posted By geeteeohguy
I did this on my '67 400 about 15 years ago and...

I did this on my '67 400 about 15 years ago and it worked out fine. I added screw in studs but kept the smaller valves. I'm a little over 9:1 CR and it runs on 91 octane. Mine cc'd at 87. With the...
Forum: Pontiac - Street 08-14-2024, 07:27 AM
Replies: 31
Views: 978
Posted By scott70
If you find a pair have them cc’d first. Those...

If you find a pair have them cc’d first. Those heads are sometimes in the low 90’s actually.
Forum: 66-67 GTO Tempest & LeMans TECH 08-14-2024, 01:04 AM
Replies: 7
Views: 324
Posted By RedDirtRoad
Had the same issue on another 67 restoration...

Had the same issue on another 67 restoration project
Contact Shiftworks
They have the right cable and components to correct your issue
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