FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#41
|
||||
|
||||
That’s true and a point that I missed!
The Pontiac is also wider up top then the SBC, so overall the intake runners are longer helping out torque production also!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#42
|
||||
|
||||
Quote:
Advertised Duration: 278 int./288 exh. It would interesting what tappet rise that advertised rating is at? In a low compression engine I'm VERY concerned about when the valve actually opens and seats. Delaying intake valve close there is very bad! Opening the exhaust valve earlier at low RPM hurts torque, as does closing the exhaust valve later. The Comp HE268 lobe has 272.8 duration @ .0045 tappet rise. but 218.6 @ .050 for breathing. https://www.youtube.com/watch?v=m9dSIUFWNpg 14 flat is decent for a low compression stock head 350 Pontiac.. granted it has some good gears. Running very close to the valve events Dynomation 6 said was the best from 2000 to 4500 RPM, in truth the program wanted 107 LSA but modelling was with headers. I kept intake valve close and exhaust valve open the same, I presume the OP here is running exhaust manifolds. Last edited by pastry_chef; 10-08-2021 at 06:56 PM. |
#43
|
||||
|
||||
Quote:
Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm Last edited by Stan Weiss; 10-08-2021 at 07:03 PM. |
#44
|
||||
|
||||
Quote:
These were not measured by me. 2800 Intake 266.5 @ 0.006" - 204 @ 0.050" Exhaust 279.5 @ 0.006" - 215.5 @ 0.050" 2801 Intake 275 @ 0.006" - 214 @ 0.050" Exhaust 286 @ 0.006" - 225 @ 0.050" Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#45
|
|||
|
|||
My 2800 and 2801 cam cards were not 100% informative I hand filled the 2800 in dont remember from where I got that info
I used both in a 350 with #47 heads automatic 2.73 gear I used a 068 in a 350 with #48 heads 4 speed 3.36 gear I used sig erson 204/204 @.050 .411 lift in 350 #11 heads 4 speed 3.36 gears Now the 350 has #48 heads lunati 30706 cam 4 speed 3.73 gear no street time yet Last edited by Formulas; 12-17-2023 at 10:11 AM. |
The Following User Says Thank You to Formulas For This Useful Post: | ||
#46
|
||||
|
||||
Quote:
For the 2800 card looks like 262/ 272 is printed for advertised. Much better than 278 / 288 from the Summit website. I wonder if some of these differences are due to varied suppliers over the years. Over nearly 7000 variations of valve events in Dynomation 6, all the best 5 had 61 ABDC intake close (7.5 compression 350 Pontiac). Last edited by pastry_chef; 10-08-2021 at 08:52 PM. |
The Following User Says Thank You to pastry_chef For This Useful Post: | ||
#47
|
||||
|
||||
Quote:
People want to talk about a RA IV 230 @ .050 cam being way to big for a 350, barely begins to tickle the surface. In no way do I see an 068 being too big for a 350, that's crazy talk. I've run the snot out of that camshaft for years. It's puny in comparison. But that kind of talk does not surprise me a bit coming from die hard Pontiac people. |
The Following User Says Thank You to Formulajones For This Useful Post: | ||
#48
|
||||
|
||||
The larger duration numbers for those 2800 and 2801 are SAE numbers. Rocker arm ratios have an effect on those numbers. Rated at .006” at the valve. The numbers Stan posted are pretty close to what they are at .006”tappet lift. The lower numbers like the 262 and 272 are advertised acts like numbers some picked in a board room.
|
#49
|
||||
|
||||
Jon Hardgrove ( Carbking) has a 041 cam in his 350 Ventura/GTO.
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#50
|
|||
|
|||
Simple honest question how many of you have actually actually owned / experienced a P350 / 068 combo ?
P350 threads are always a slow train wreck by experts who have never wrenched on them or lean on almost the same examples full of conjecture Last edited by Formulas; 10-08-2021 at 10:37 PM. |
#51
|
||||
|
||||
Not me. I have 100,000 miles on a low compression '72 350.......
__________________
Karl |
#52
|
||||
|
||||
Quote:
From my recollection, the W31 was a 308 cam vs the W30 328 455 cam.
__________________
65 Tempest, 400, TH400 86 Fiero SE 2.8 |
#53
|
||||
|
||||
Quote:
As I already posted i've used the 350 Pontiac in many different applications, it's not disappointed me so far. |
The Following User Says Thank You to Sirrotica For This Useful Post: | ||
#54
|
||||
|
||||
Quote:
Go this order…first…gear change to 3.08-3.23 Second….2.5” mandrel exhuast system Third….4 bbl q jet Fourth….cam change to that 2800 I suggest not try the cam swap first. I remember a buddy put a 4 bbl on his 67 326 lemans with 2.56s and a st300 2 speed. It was hilariously just as slow as it was with the 2 bbl. He did gain on the 4bbl sound though……floor it and……wwwwaaaaaaaaahhhhh…….. Some good gears that would have kept the engine from laboring so much and it would have been a different car…. I did a 260*@.050” solid roller in a lowish compression big valve 350. I remember it being pretty awesome. Last edited by Jay S; 10-09-2021 at 12:26 AM. |
#55
|
||||
|
||||
Quote:
Pontiac used 2.56 gears in a lot of their base models, with a 2 speed they were dogs out of the hole, with a 2.48 first gear makes it a much better car from a standstill. Not a race car, but much better than the 2 speed. |
#56
|
||||
|
||||
Haven't seen Squidward on here lately but he had a lot of experience with 350s and his posts were always useful. Here's an example:
http://forums.maxperformanceinc.com/...89&postcount=7 My car has it's original 350 2bbl with 11 heads. I installed a 2800 cam and quadrajet but have yet to drive the car after what... 20 yrs of looking at it? When I do try to get it running, I think the 11 heads may go away as I understand the CR is likely under 8 despite the "specs" that claim 8.8. After reading this forum for years, I doubt the 2800 will add any power and may actually hurt the low-rpm torque... Where's the data? Or at least somebody that measured the results of a low-compression 350 cam change? |
#57
|
|||
|
|||
I'll have to ask Dan to send me the dyno results of a '69 350HO for an automatic application (067 cam) he was building for the pure stock drags. I don't think is was maxed out at 12.0 compression.
Dennis |
#58
|
||||
|
||||
It needs to be noted that the Olds W31 cam has only 82 degrees of over lap to the RA4’s 87.
The Olds heads could not compare to the valve sizes in the 69 48 casting either! Less over lap and smaller valves makes for more port velocity and better street manors.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#59
|
||||
|
||||
I agree with Brad and Steve25 on all counts. In the past 40+ years have run a 326 in a '65 GTO with a 4 speed and 3.23, and it almost kept up with my '66 Coronet 44 4 speed 3.23 rear gear car. Not even a car length. The 326 had a Crane Fireball cam, tube headers, and a Holley 750. A friend had a '65 GTO with a 350 that was stock, but with a '66 tripower bolted on and a TH350 trans with a 3.55 rear gear. That car would pin you in the seat. Pontiac 326/350's are excellent, durable, and under-rated engines.
__________________
Jeff |
The Following User Says Thank You to geeteeohguy For This Useful Post: | ||
#60
|
||||
|
||||
Quote:
https://forums.maxperformanceinc.com...d.php?t=622996
__________________
Karl |
Reply |
|
|