Forum: Pontiac - Street
09-23-2022, 07:01 PM
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Replies: 59
Views: 6,018
Thanks for the detail.
So when we see (modern)...
Thanks for the detail.
So when we see (modern) pictures of 70 RA4 cars with Ram Air IV on the scoop, this was just recently added as Gratuitous Bling?
See below video about 0:35.
Also, Chestnut's...
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Forum: Pontiac - Street
09-23-2022, 06:05 PM
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Replies: 59
Views: 6,018
Appreciate the offer, message sent!!!
I...
Appreciate the offer, message sent!!!
I don't see a Ram Air IV on that scoop - maybe the prototype RA4 car didnt have the fancy lettering? That would mean that in the early magazine articles eg...
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Forum: Pontiac - Street
09-23-2022, 03:02 PM
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Replies: 59
Views: 6,018
I Had to read that a couple times but answers a...
I Had to read that a couple times but answers a lot of questions I had.
I had thought that Feb 1970 was way too early for a RA4 Firebird.
And it would be - in fact most of model year 1970 would be...
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Forum: Pontiac - Street
09-23-2022, 01:43 PM
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Replies: 59
Views: 6,018
I have the June 1970 Car & DRIVER but not June...
I have the June 1970 Car & DRIVER but not June 1970 Car LIFE.
The Car Life was 14.40 at ___ MPH?
Car & Driver was 14.10 at 103.2mph.
That 103.2 is what strikes me as pretty high for the 068 cam,...
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Forum: Pontiac - Street
09-22-2022, 09:31 PM
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Replies: 59
Views: 6,018
unruhjonny,
"But, there was a pre-production...
unruhjonny,
"But, there was a pre-production RAIV Trans Am in the fleet of cars - that one which I highlighted as red, WAS a RAIV car - the images make it plainly obvious."
Can you clarify a...
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Forum: Pontiac - Street
09-22-2022, 02:42 PM
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Replies: 59
Views: 6,018
Here is part of my confusion: That 345hp.
For...
Here is part of my confusion: That 345hp.
For 1969, 345hp meant a Firebird RA4.
For 1970, 345hp meant a Firebird RA3.
For 1970 RA3, Angeles-McCarthy's 1981 book says 744 cam, but McCarthy's 1989...
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Forum: Pontiac - Street
09-21-2022, 08:47 PM
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Replies: 59
Views: 6,018
Sounds like a typical NHRA cheater cam from...
Sounds like a typical NHRA cheater cam from 1968-up (or maybe even before that?)
Do you think that cam was the one in the March 1964 Car & Driver "389" GTO vs Ferrari article?
Or did the cam &...
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Forum: Pontiac - Street
09-21-2022, 05:25 PM
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Replies: 59
Views: 6,018
Also at the more standard .050 lobe I have
...
Also at the more standard .050 lobe I have
200-210-111.3 066 cam
200-213-113.5 067 cam
212-225-116.0 068 cam
224-236-115.5 744 cam
231-240-113.5 041 cam
On the 067 cam, the only place I've...
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Forum: Pontiac - Street
09-21-2022, 12:08 PM
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Replies: 59
Views: 6,018
Wow thanks for all the quick replies, that...
Wow thanks for all the quick replies, that answers that!
Indeed McCarthy pg 45 notes that even the 1969 RA3 dropped the 744 cam after engine 709185, so the 744 cam being gone for 1970 makes sense....
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Forum: Pontiac - Street
09-21-2022, 10:45 AM
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Replies: 59
Views: 6,018
Was 1970 400-RamAir3 the 068 cam or 744 cam?
Was 1970 400-RamAir3 the 068 cam or 744 cam?
In learning all the complexities of Pontiac history I came across the specs in Angeles & McCarthy:
For 1970, the 400 RA3 is shown as ALL with 068 cam,...
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Forum: Pontiac - Street
09-14-2022, 11:31 AM
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Replies: 153
Views: 10,818
Thanks Stan the sheet you posted is a good...
Thanks Stan the sheet you posted is a good example.
The left column 1.075 is the STP or SAE-J607 correction to 60F 29.92 dry sea level.
The next column 1.033 that says SAE is the newer SAE-J1349...
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Forum: 67-79 Big Pontiac TECH
09-14-2022, 10:57 AM
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Replies: 467
Views: 127,243
joegpho,
Do you have a link to your engine &...
joegpho,
Do you have a link to your engine & dyno results?
Was the dyno done with steel headers or iron manifolds (which ones?), and any pipes/mufflers?
Compression ratio?
Corrected to SAE-J-607...
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Forum: Pontiac - Street
09-14-2022, 10:50 AM
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Replies: 153
Views: 10,818
I notice the dyno sheet says "corrected" but it...
I notice the dyno sheet says "corrected" but it doesnt say corrected to WHAT!
Do you know for sure?
SAE J-607 is the old "gross hp" most of us are used to from the 1960s, corrected to 60F, dry air,...
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Forum: Exhaust TECH
01-23-2006, 11:43 PM
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Replies: 7
Views: 465
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Forum: Exhaust TECH
12-16-2005, 12:36 AM
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Replies: 5
Views: 413
Header Primary Tube? It depends
I tried the formula on the Wallace Racing site and got some wild answers, not in agreement with things that I know work.
The ideal diameter has to be small enough to fill the pipe and make the...
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Forum: Exhaust TECH
12-02-2005, 01:42 AM
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Replies: 2
Views: 379
Exhaust Sizes
Dear Judges Dad,
I looked in Automotive Industries January 1970 pg 81, it says 2" pipes and 2.25 tailpipes was stock GTO.
The rules-of-thumb I use are:
2" is ok to about 280-320hp
2.25" is ok to...
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Forum: Exhaust TECH
12-02-2005, 01:20 AM
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Replies: 0
Views: 137
Header Tube Lengths?
Does anybody know the header tube lengths for the 3-tube headers made by Hedman, Cyclone, Hooker for the (326-455) block?
All my catalogs only show the diameters eg (1-5/8 and 2") or (1-3/4 and 2"...
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Forum: Exhaust TECH
12-02-2005, 01:11 AM
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Replies: 15
Views: 876
Manifolds=Investment Headers=Power
Jeff,
I voted for manifolds for YOUR car because:
a] It sounds like a pretty stock 389 tripower, at 350hp or so headers will gain you some (15 hp or so) but not much. In contrast, at 450-500hp...
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Forum: Pontiac - Street
08-08-2005, 10:38 PM
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Replies: 1
Views: 566
Need Cam Duration Info, OHC-6
I am trying to find the .050" Lobe Lift Durations for the OHC-6 factory cams.
Let's see, there was a 230-165hp, a 230-207hp, a 250-175hp, a 250-215hp, a 250-230hp OHC.......different cams? Same?...
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Forum: Pontiac - Street
08-08-2005, 10:21 PM
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Replies: 11
Views: 692
Yes, the Gtech-Pro "G" feature is the best..
I have used my Gtech on about 5 different cars so I dont fine-tune it.
In general it is about 0.2 sec and 2 mph optimistic vs the track [I have used the G-tech vs the track timers to see this]
The...
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Forum: 66-67 GTO Tempest & LeMans TECH
08-08-2005, 10:08 PM
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Replies: 1
Views: 169
Need Info on OHC-6 Cam Duration
I am trying to find the .050" Lobe Lift Durations for the OHC-6 factory cams.
Let's see, there was a 230-165hp, a 230-207hp, a 250-175hp, a 250-215hp, a 250-230hp OHC.......different cams? Same?...
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Forum: Pontiac - Street
12-28-2002, 11:01 AM
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Replies: 15
Views: 421
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Forum: Pontiac - Street
12-26-2002, 10:28 PM
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Replies: 27
Views: 1,185
The Ford "FE" big block has
deck ht = 10.17" ...
The Ford "FE" big block has
deck ht = 10.17"
bore spc = 4.63"
The "FE" started as a 332, ended up at 428 but couldve been 447 had Ford mixed crank & bore.
near same as Pontiac 326-455 block....
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Forum: Pontiac - Street
12-26-2002, 10:19 PM
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Replies: 15
Views: 421
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