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Forum: 67-79 Big Pontiac TECH 01-10-2024, 12:29 AM
Replies: 0
Views: 541
Posted By john67455
Round Port Headers for 1967 Grand Prix

I'm building a stroker 400 for my '67 GP. Planning on using original 400 engine, with 4.5" stroke and max bore I can get away with. First step is to mock it all up. I've got the Edelbrock round...
Forum: 67-79 Big Pontiac TECH 09-11-2020, 10:06 AM
Replies: 6
Views: 1,661
Posted By john67455
Thanks for taking the time to help. You make a...

Thanks for taking the time to help. You make a good point and I will push on with what I have.

How does this sound for an argument:

The service manual definitely differentiates between...
Forum: 67-79 Big Pontiac TECH 09-10-2020, 05:16 PM
Replies: 6
Views: 1,661
Posted By john67455
Thanks for the reply. I learned all that,...

Thanks for the reply. I learned all that, unfortunately after the purchase of the 8.2". My problem is that there doesn't seem to be any articles, publications, etc, that give any real detail about...
Forum: 67-79 Big Pontiac TECH 09-10-2020, 03:44 PM
Replies: 6
Views: 1,661
Posted By john67455
Differential Documentation Needed

Hello All, I'm having a bit of a disagreement with a major parts vendor and am hoping somebody can help me out. I bought a new posi-traction differential and gear set for my 1967 GP without doing...
Forum: Big Pontiacs(including G-body) FOR SALE 06-14-2018, 04:19 PM
Replies: 12
Views: 1,176
Posted By john67455
Still for sale?

Still for sale?
Forum: Big Pontiacs (incl. G-body) WANTED 06-14-2018, 03:54 PM
Replies: 1
Views: 3,069
Posted By john67455
Wanted - 1967 Grand Prix Hardtop

Looking for an all original (or as close as possible) 1967 GP hardtop with front buckets, A/C, PW (other options welcome, but these are the minimum). Doesn't have to be a 428, mainly want as close...
Forum: Pontiac - Race 05-30-2016, 09:39 AM
Replies: 36
Views: 2,074
Posted By john67455
It's interesting what you are saying about idle...

It's interesting what you are saying about idle quality, hesitation, surge, etc.

I recently started experiencing these issues after switching to E-85.

Prior to E-85, I was running a Holley...
Forum: Pontiac - Race 05-30-2016, 08:34 AM
Replies: 36
Views: 2,074
Posted By john67455
Larry, thanks for the update. I thought it was...

Larry, thanks for the update. I thought it was typical to measure duration in terms of advertised duration. I was planning to reduce overlap @0.006", while keeping it about the same at 0.050". By...
Forum: Pontiac - Race 05-29-2016, 01:42 AM
Replies: 36
Views: 2,074
Posted By john67455
Thanks for the update. 2.11"/1.66" valves. ...

Thanks for the update.

2.11"/1.66" valves.

Exhaust flow about 210 cfm at 0.600".
Forum: Pontiac - Race 05-29-2016, 01:34 AM
Replies: 36
Views: 2,074
Posted By john67455
I forgot to mention an article that seems pretty...

I forgot to mention an article that seems pretty reasonable when looking at LSA changes only.

http://www.cranecams.com.au/pdfs/MAY14-Lobe_separation_article.pdf

This article definitely supports...
Forum: Pontiac - Race 05-29-2016, 01:17 AM
Replies: 36
Views: 2,074
Posted By john67455
That is certainly the conventional wisdom, but I...

That is certainly the conventional wisdom, but I wonder if there is better data out there to back this up. I have done no testing to measure the differences obtained when only changing LSA. I'm...
Forum: Pontiac - Race 05-28-2016, 03:29 PM
Replies: 36
Views: 2,074
Posted By john67455
Having reviewed several more threads, the optimum...

Having reviewed several more threads, the optimum LSA is difficult to pin down.

On the one side is Cliff R, seeming to support wider LSA's. Cliff's experience seems to surely indicate that wider...
Forum: Pontiac - Street 05-28-2016, 03:05 PM
Replies: 43
Views: 2,134
Posted By john67455
Rocky, You had to ask about the one set of...

Rocky,

You had to ask about the one set of tests that I didn't keep.:D

I don't have the test data for the spacer tests available, but if I recall correctly, the 1" spacer was worth a few ft-lb...
Forum: Pontiac - Street 05-28-2016, 11:55 AM
Replies: 43
Views: 2,134
Posted By john67455
I've got the same dyno at home and a somewhat...

I've got the same dyno at home and a somewhat similar engine (yours is a bit more radical). One big problem I had was wheel spin on the dyno (I am running sticky tires with 140 treadwear, 275...
Forum: Pontiac - Race 05-28-2016, 11:25 AM
Replies: 36
Views: 2,074
Posted By john67455
Thanks for the update. Funny enough, I was just...

Thanks for the update. Funny enough, I was just reviewing a thread with lobes from the XFI Xtreme category. That engine made almost 600 hp, with 3017/3038 lobes.
...
Forum: Pontiac - Race 05-28-2016, 05:53 AM
Replies: 36
Views: 2,074
Posted By john67455
Getting there on HR cam selection... Leaning...

Getting there on HR cam selection...

Leaning towards Comp Cams, rather than Bullet. Looking at lobes and it seems Comp gets more duration @0.200" lift. This tells me I can get more "area under...
Forum: Pontiac - Race 05-14-2016, 07:09 AM
Replies: 36
Views: 2,074
Posted By john67455
We did discuss springs. Mark recommended...

We did discuss springs. Mark recommended PAC-1914 springs. These allow for 0.600" lift, and 165/385 lb closed/open loads (1.8" installed height). He also thinks my main problem right now is my...
Forum: Pontiac - Race 05-14-2016, 03:06 AM
Replies: 36
Views: 2,074
Posted By john67455
I just spent over an hour on the phone with Mark...

I just spent over an hour on the phone with Mark at Bullet. Most helpful conversation in a long time...

Here is the recommendation:

Int Master (HR306/3677) and Exh Master (HR315/3677)
Dur at...
Forum: Pontiac - Race 05-13-2016, 08:26 AM
Replies: 36
Views: 2,074
Posted By john67455
Thanks for all of the input so far. I think I...

Thanks for all of the input so far. I think I need to refine things slightly. I am planning to reuse my hydraulic roller lifters.

I notice that in the Comp Cams and Lunati catalogs there aren't...
Forum: Pontiac - Race 05-12-2016, 10:27 AM
Replies: 36
Views: 2,074
Posted By john67455
Good point. I know it's hard to say exactly, but...

Good point. I know it's hard to say exactly, but roughly how much hp would be sacrificed?
Forum: Pontiac - Race 05-12-2016, 10:07 AM
Replies: 36
Views: 2,074
Posted By john67455
Thanks for the info. I share the concerns with...

Thanks for the info. I share the concerns with the rods, but they are working well so far. I currently have 420 RWHP and 30+ chassis dyno pulls to 6,000 RPM, or so.

Current cam is hydraulic...
Forum: Pontiac - Race 05-12-2016, 05:00 AM
Replies: 36
Views: 2,074
Posted By john67455
Cam Choice for Maximum Performance

Every time I check out this forum, I am very impressed with the level of information and the amount of time people spend trying to help the rest of us. There is a lot of “tribal” knowledge out there...
Forum: Pontiac - Race 05-08-2016, 03:33 PM
Replies: 93
Views: 3,690
Posted By john67455
X4 Just spent an hour going through the...

X4

Just spent an hour going through the thread and am dying to know how the engine turne out.
Forum: Pontiac - Race 05-07-2016, 02:02 PM
Replies: 14
Views: 837
Posted By john67455
Not sure about the flow numbers. The heads were...

Not sure about the flow numbers. The heads were supposed to have been ported, but I didn't see actual numbers. I'm pretty sure the valves are the sizes as delivered from Edelbrock (2.11"/1.66", I...
Forum: Pontiac - Race 05-07-2016, 08:10 AM
Replies: 14
Views: 837
Posted By john67455
I was able to put the car on the Mustang dyno a...

I was able to put the car on the Mustang dyno a couple of months back. We managed about 30 pulls trying just about everything I could think of (intake spacers, timing settings, different carbs,...
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