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Showing results 1 to 25 of 97
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Posts Made By:
25stevem
Forum:
Pontiac - Street
02-02-2023, 02:45 PM
Replies:
10
Confused by this ported vacuum switch
Views:
1,797
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
What thread size?
Views:
1,545
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
Factory cast crank experiences
Views:
8,434
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
Air cleaner housing
Views:
1,126
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
Searching for a vacuum leak
Views:
1,085
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
69 GTO tailpipe’s
Views:
667
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
Wide Ports on Stock Block
Views:
958
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
Need expert engine advice
Views:
7,174
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
Why don't valve lifters turn
Views:
2,084
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
Why don't valve lifters turn
Views:
2,084
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
Can ignition switch cause starter issues?
Views:
1,376
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
How Much Timing Chain Slop?
Views:
1,214
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
How Much Timing Chain Slop?
Views:
1,214
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
IA2 Aluminum 535 Main Bearings
Views:
1,668
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
Comp XE 256 cam in an 8.0 to 1 400
Views:
8,474
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
1976 400 Build for T/A
Views:
1,644
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
intake porting
Views:
2,358
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
455 street cam choice
Views:
5,532
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
Street Demon 625 - tuning results with AFR monitor
Views:
686
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
Cam Information
Views:
3,408
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
Camshaft won’t fit into new bearings
Views:
2,125
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
Cam Information
Views:
3,408
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
455 beveled piston questions
Views:
4,039
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
No spark msd ignition
Views:
1,158
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
Was 1970 400-RamAir3 the 068 cam or 744 cam?
Views:
6,140
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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