| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
01-10-2011, 04:59 PM
|
|||
|
|||
New Roller Rocker Arms, and what else?
So fella's,
I love the idea of a simple rocker arm swap netting 10-20hp. The cost per dollar seems to appealing to pass up. Here's the question; What else is needed to swap from the stock 1.5:1 rocker arms to a nice set of 1.5:1 full roller arms? It should be an easy swap if staying with the same ratio, right? Thanks, Tony |
|
#2
01-10-2011, 05:36 PM
|
||||
|
||||
|
correct...
__________________
 My 1965 Lemans.... 
|
|
#3
01-10-2011, 06:00 PM
|
||||
|
||||
|
I'd think you would also need to also increase the ratio to see that sizable of a gain. I'm no expert on ponchos though.
__________________
-Jeremy 1968 GTO 4-spd convertible, console, factory gauges, hidden headlights, 3.90:1 posi, AM/FM radio. 1962 Catalina convertible, Starlight black w maroon interior & white top. |
|
#4
01-10-2011, 06:04 PM
|
||||
|
||||
|
Also correct...
__________________
My 1965 Lemans....
|
|
#5
01-11-2011, 01:49 AM
|
|||
|
|||
|
10-20 hp on a stock motor with swapping in roller rockers? Not going to happen. Ask a Pure Stock racer, they make more power with stamped rocker arms than with the roller tip 1.52's. Has to do with the flatter curve of the stamped arms actually opening the valve more than the tighter radius of the roller tip.
__________________
Paul FAST Automotive -The Pontiac restoration shop, not the fuel injection guys! I had the name first. My site... needs updated- www.fastrestorations.com 68 GTO's (RA II, RA I, HO, convert, Pro Street, Racecar, etc.), 2 69 GTO Judges, 70 GTO racecar -10.77 @ 124mph, 68 Tempest survivor, 3 03 Aztecs! |
|
#6
01-11-2011, 12:16 PM
|
|||
|
|||
|
No big power gains available with the rollers at the same ratio is the consensus that I am getting.
What am I looking at having to do in order to swap in 1.65's instead of the 1.5's originally mentioned? What are the down sides? Tony |
|
#7
01-11-2011, 12:27 PM
|
|||
|
|||
|
Grinding the pushrod openings in the head to clear the pushrods... possibly replacing the valvesprings due the extra fatigue brought on by 10% more lift. If you are looking for free power I'd make the valvetrain adjustable. That will only require a set of poly-locs and by loosening the valvetrain up you may see 10-15 hp.
__________________
Paul FAST Automotive -The Pontiac restoration shop, not the fuel injection guys! I had the name first. My site... needs updated- www.fastrestorations.com 68 GTO's (RA II, RA I, HO, convert, Pro Street, Racecar, etc.), 2 69 GTO Judges, 70 GTO racecar -10.77 @ 124mph, 68 Tempest survivor, 3 03 Aztecs! |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
