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Search took 0.03 seconds. Search: Posts Made By: 25stevem
Forum: Pontiac - Street 02-02-2023, 02:45 PM
Replies: 10
Views: 1,770
Posted By OG68
The valve switches from a ported vacuum source to...

The valve switches from a ported vacuum source to a manifold vacuum source to the distributor advance when the water temperature reaches 230*. This speeds up the idle speed increasing air flow...
Forum: Pontiac - Street 01-18-2023, 11:00 AM
Replies: 36
Views: 1,530
Posted By hurryinhoosier62
The only thing that makes sense is the original...

The only thing that makes sense is the original bolt/stud seized(very common), broke off and had to be drilled out; then, the holes were drilled and tapped for a Helicoil or a TimeCert. I have had to...
Forum: Pontiac - Race 01-13-2023, 11:18 AM
Replies: 111
Views: 8,335
Posted By PAUL K
I'm hoping the information will be archived here...

I'm hoping the information will be archived here and help other folks in the future. I probably should've posted it in the "street section" as they are the guys most likely to benefit from this...
Forum: Pontiac - Street 11-26-2022, 10:28 PM
Replies: 11
Views: 1,109
Posted By 'ol Pinion head
Will expand on what Dennis mentioned earlier, the...

Will expand on what Dennis mentioned earlier, the common short snorkel aircleaner in the original post came from one of the following:

-70 Pontiac B series with evap emissions. Not with the 455 XF...
Forum: Pontiac - Race 11-24-2022, 11:43 AM
Replies: 19
Views: 1,077
Posted By ta man
Check all your plugs that may give you an idea...

Check all your plugs that may give you an idea where to look. Are your heads ported enough to where the valve cover bolts need sealant or could cause a vacuum leak?
Forum: Pontiac - Street 11-20-2022, 12:03 PM
Replies: 2
Views: 657
Posted By OG68
IIRC the tuner pipes were for 68 models and...

IIRC the tuner pipes were for 68 models and resonators were used in 69
Forum: Pontiac - Race 11-09-2022, 01:40 PM
Replies: 10
Views: 945
Posted By Steve C.
Does the purchase include valve train pieces ? ...

Does the purchase include valve train pieces ?

If not, some considerations:

With the larger diameter and longer valves, taller valve springs are required, this all adds to valvetrain mass. Keep...
Forum: Pontiac - Street 11-02-2022, 06:16 PM
Replies: 62
Views: 7,138
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 10-29-2022, 11:09 AM
Replies: 22
Views: 2,076
Posted By Singleton
The fact that you tried a different cam and...

The fact that you tried a different cam and lifters with the same results clearly points to a problem with those four lifter bores
Forum: Pontiac - Street 10-29-2022, 09:45 AM
Replies: 22
Views: 2,076
Posted By mgarblik
Using a dial bore gauge to measure lifter bores...

Using a dial bore gauge to measure lifter bores is expensive, (if you buy the gauge) and difficult to use sometimes. I purchased a couple precision plug gauges from McMaster Carr to make a set of...
Forum: Pontiac - Street 10-22-2022, 01:12 PM
Replies: 11
Views: 1,368
Posted By Greg Reid
I chased the exact same problem with my mini...

I chased the exact same problem with my mini starter for quite a while. I rigged up a jumper with a push button so that I could activate the starter from under the car and see what was happening and...
Forum: Pontiac - Street 10-21-2022, 06:56 AM
Replies: 13
Views: 1,206
Posted By GoreMaker
What I've done in the past on the advice of a...

What I've done in the past on the advice of a previous machinist is clean the chain thoroughly with solvent and then soak it in a bath of ATF for at least 30 minutes before final install. That seems...
Forum: Pontiac - Street 10-21-2022, 06:38 AM
Replies: 13
Views: 1,206
Posted By Cliff R
The slop will be double that after a couple hours...

The slop will be double that after a couple hours of "run-in". Then it will "set" and be OK for quite a while.

I used a Rollmaster once, and it did fine for about 4 years. I even had the front...
Forum: Pontiac - Race 10-17-2022, 09:46 AM
Replies: 12
Views: 1,659
Posted By mgarblik
A few things that might help us with your...

A few things that might help us with your unfortunate engine failure. 1. How do the main bearings look? Pics please. 2. Which rod bearing/bearings failed, cylinder number? 3. What connecting...
Forum: Pontiac - Street 10-15-2022, 09:49 AM
Replies: 108
Views: 8,401
Posted By Cliff R
That cam is going to be a "turd" in a 400 build...

That cam is going to be a "turd" in a 400 build at any compression ratio....IMHO

I've had quite a few Pontiac 400's, and a few Olds 400's brought in here for "custom tuning" using the larger XE262...
Forum: Pontiac - Street 10-08-2022, 10:36 PM
Replies: 20
Views: 1,638
Posted By b-man
The RA manifolds definitely will not mate up to...

The RA manifolds definitely will not mate up to the stock Y-pipe.

I would run stock log exhaust manifolds if you must keep the Y-pipe, there’s no good reason to use RA manifolds if you’re not...
Forum: Pontiac - Street 10-07-2022, 11:37 AM
Replies: 27
Views: 2,352
Posted By Formulajones
I never touched the runners on the ones I've...

I never touched the runners on the ones I've done. I simply port match to the heads being used and blend that about an inch up into the port, then I modify the top of the intake under the carb...
Forum: Pontiac - Street 10-05-2022, 07:03 AM
Replies: 43
Views: 5,483
Posted By Cliff R
I'll put this out there as a "general rule of...

I'll put this out there as a "general rule of thumb" for a street engine build.

If you find your new build wanting, needing, liking or responding well to having to run much more than about 10-14...
Forum: Pontiac - Street 10-05-2022, 01:35 AM
Replies: 6
Views: 668
Posted By RAFO9A
Street Demon 625 - tuning results with AFR monitor

Spent the day tuning the Street Demon 625 on my ‘68 Firebird. The engine is 8.9:1 CR with a Pertronix HEI distributor (18 deg. initial + 15 deg. manifold vacuum advance). Here’s what I got today:
...
Forum: Pontiac - Street 10-03-2022, 02:48 PM
Replies: 35
Views: 3,384
Posted By Stan Weiss
There are a couple of printouts labeled Elgin....

There are a couple of printouts labeled Elgin. One a 909 and the other 778. That I can find both are still in the latest catalog.

Stan
Forum: Pontiac - Street 10-02-2022, 03:02 PM
Replies: 19
Views: 2,107
Posted By b-man
On my 421 build the cam went into the first 4...

On my 421 build the cam went into the first 4 bearings but wouldn’t go in any further so we used a homemade reamer:

https://forums.maxperformanceinc.com/forums/showpost.php?p=5456639&postcount=27
Forum: Pontiac - Street 10-01-2022, 10:59 AM
Replies: 35
Views: 3,384
Posted By Stan Weiss
Cam Information

Ken Croice / H-O Enterprises

Thank you so very much for sharing these Cam Dr printouts with me. There is a lot to go through and figure out exactly what this all is.

I have managed to get...
Forum: Pontiac - Street 09-24-2022, 02:47 PM
Replies: 51
Views: 4,001
Posted By KEN CROCIE
Third times the charm ? My third attempt at...

Third times the charm ? My third attempt at replying to this post.
We at HO tore down virgin, never been apart, engines.We occasionally came across a champhered piston.
If I recall, the chafer was...
Forum: Pontiac - Street 09-23-2022, 11:02 PM
Replies: 22
Views: 1,138
Posted By TinInjun
That is your issue. The only hot wire while...

That is your issue. The only hot wire while cranking is the original coil wire.
Forum: Pontiac - Street 09-22-2022, 03:48 PM
Replies: 59
Views: 6,083
Posted By SD455DJ
We had a ’69 RAIV Firebird at this year’s race...

We had a ’69 RAIV Firebird at this year’s race along with 2 - ’68 RAII Firebirds (all are ‘clone’ cars with the ’69 an original 350HO car and the ’68’s 330 hp Firebird 400 cars). All are 4-speed cars...
Showing results 1 to 25 of 97
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