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Forum: Pontiac - Street 04-13-2024, 02:27 AM
Replies: 6
Views: 539
Posted By gto4ben
I got tired of guessing what performance the...

I got tired of guessing what performance the commercially available PP springs have so I created a spreadsheet that takes free length, outer dia., coil count, and wire diameter to calculate the...
Forum: Pontiac - Street 04-07-2024, 12:18 PM
Replies: 32
Views: 1,517
Posted By 78w72
M1206a. RA has them for $7ea.. oreillys wants...

M1206a. RA has them for $7ea.. oreillys wants $18! amazon is $24 for 2.

https://www.rockauto.com/en/moreinfo.php?pk=9662784&cc=1250402&pt=5340&jsn=934

amazon has dimensions so can compare to...
Forum: Pontiac - Street 04-03-2024, 06:53 AM
Replies: 21
Views: 1,061
Posted By napster
I understand the idea of something different. I...

I understand the idea of something different. I have my share of 461's. I went with the 433 RA IV in my '70. 4 inch stroke forged SCAT crank etc... I love it. Recently had to change the...
Forum: Pontiac - Street 03-30-2024, 08:55 AM
Replies: 56
Views: 2,061
Posted By PAUL K
Maybe we're doing chit wrong but we made 735 on...

Maybe we're doing chit wrong but we made 735 on pump gas with a factory block recently. Another Pontiac builder was North of 900 with pump gas and an aftermarket block. Both builds used Hi-ports.
...
Forum: Pontiac - Street 03-22-2024, 06:54 AM
Replies: 149
Views: 11,850
Posted By steve25
It's too late now, but the fact of the matter is...

It's too late now, but the fact of the matter is the the head bolt pinch in is not much of a flow restriction in the E heads in out of the box form.
what is however is the height of the runner from...
Forum: Pontiac - Street 03-08-2024, 02:32 PM
Replies: 16
Views: 1,040
Posted By steve25
Do not just unplug the wires from the plugs! ...

Do not just unplug the wires from the plugs!

You need to kill the power to the HEI other wise when cranking the motor it’s still producing a spark with no where to ground out to so then it can...
Forum: THE LOBBY 03-08-2024, 01:30 PM
Replies: 8
Views: 1,038
Posted By grandam1979
You have your self appointed experts that if you...

You have your self appointed experts that if you give an opinion that’s not in line with what they think you’re wrong and that’s that. In my option a lot at good advice is lost do to this it’s not...
Forum: Pontiac - Street 03-07-2024, 12:32 PM
Replies: 9
Views: 701
Posted By steve25
Info.

Info.
Forum: Pontiac - Street 01-31-2024, 01:32 PM
Replies: 22
Views: 981
Posted By Keith Seymore
Sorry - took me a while to find these. I...

Sorry - took me a while to find these.

I wrote these as a development engineer for inclusion in the S truck service manual. Hopefully they are self explanatory.

The only thing I would add is...
Forum: Pontiac - Street 01-18-2024, 04:28 PM
Replies: 16
Views: 780
Posted By steve25
In this area of any production iron head ( as in...

In this area of any production iron head ( as in my first photo)I have always found to be .300” plus or minus .020” if the head(s) have not been milled .
If the heads have been run you should aways...
Forum: THE LOBBY 12-08-2023, 01:02 PM
Replies: 1
Views: 433
Posted By b-man
Bye Pedro, Paul or whatever scammer from Western...

Bye Pedro, Paul or whatever scammer from Western Europe.

Try harder next time.
Forum: Pontiac - Street 11-17-2023, 07:22 AM
Replies: 36
Views: 1,805
Posted By steve25
Boy, some of the opinions posted here really make...

Boy, some of the opinions posted here really make me shake my head in disbelief!

For example if running a Cam of greater lift produces more power due to accessing higher levels of air flow, then...
Forum: Pontiac - Street 11-16-2023, 04:07 PM
Replies: 53
Views: 2,402
Posted By steve25
In terms of the width of the chambers ( spark...

In terms of the width of the chambers ( spark plug side to quench side ) in the 6X-4 heads I have, over the decades more then proven to myself each time that a mill of .006” will take out 1 CC....
Forum: Pontiac - Street 11-05-2023, 03:23 PM
Replies: 34
Views: 2,145
Posted By steve25
Here’s a up date on intake port volumes and some...

Here’s a up date on intake port volumes and some other details between the stock and ported intake.

The stock intake port CC’ed in at 151 .
Quite small considering that these 17 degree heads have...
Forum: Pontiac - Street 10-26-2023, 08:12 PM
Replies: 34
Views: 2,145
Posted By steve25
Thanks for the Thumbs up! This head was used...

Thanks for the Thumbs up!

This head was used on 3 or 4 different Hp rating 389 motors if I recall right, and at best with there stock flow numbers even making 300 hp would take a full on race...
Forum: Pontiac - Street 09-24-2023, 01:46 PM
Replies: 30
Views: 1,448
Posted By JLBIII
Thanks for the replies. I've decided to use the...

Thanks for the replies. I've decided to use the KISS principle and go with the as cast heads using my current rockers and manifolds for now. I think the 290 ported heads might be a little bit of...
Forum: Pontiac - Street 09-22-2023, 01:32 PM
Replies: 30
Views: 1,448
Posted By steve25
Rule one. stop listening to people who have a...

Rule one.
stop listening to people who have a grinding burr, chucked up in a grinder, but no easy access to a bench and a velocity probe who tell you that in regards to a aluminum head just have...
Forum: Pontiac - Street 09-05-2023, 09:03 AM
Replies: 80
Views: 4,260
Posted By steve25
Blow this up and print it off to keep in your...

Blow this up and print it off to keep in your files .
Forum: Pontiac - Street 08-16-2023, 05:43 PM
Replies: 12
Views: 487
Posted By steve25
Although a iron D port head can be ported to 290...

Although a iron D port head can be ported to 290 intake cfm@28” it’s very hard to find a head that has no core shift which is what’s required to do that, and with no one Now CNC porting iron hand...
Forum: SOLD Parts 08-11-2023, 07:34 PM
Replies: 10
Views: 1,517
Posted By Mo
Assuming this is for a factory cam tunnel,...

Assuming this is for a factory cam tunnel, correct?

Thanks
Forum: Pontiac - Street 04-20-2023, 05:06 PM
Replies: 8
Views: 1,062
Posted By geeteeohguy
I've been double-checking parts for about 10...

I've been double-checking parts for about 10 years now, with high failure rates. Started with ignition parts and morphed to everything else. The rubber today is super bad. Better off re-using 50...
Forum: Pontiac - Street 03-27-2023, 10:51 AM
Replies: 6
Views: 652
Posted By Formulas
sounds close to the #47 and #11 heads

sounds close to the #47 and #11 heads
Forum: Pontiac - Street 03-20-2023, 04:10 PM
Replies: 71
Views: 7,972
Posted By Shiny
Shaker455 is a true carb whisperer and I am...

Shaker455 is a true carb whisperer and I am grateful for his help.

I just finished the rest of my changes, static-timed the engine, poured some gas in the carb vent and it fired right up. It...
Forum: THE LOBBY 02-24-2022, 12:15 PM
Replies: 42
Views: 5,962
Posted By Greg Reid
Good for you dataway! Seems that we're the same...

Good for you dataway! Seems that we're the same age.
I wish I still had my first 68 GTO. I've never really bonded with this one the way I did that one. Lost it due to an engine fire in 1985. I...
Showing results 1 to 24 of 24

 
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