| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
|
|
#1
05-04-2020, 08:58 PM
|
||||
|
||||
Ok here is a little visual for ya. The first pic is the stock L2359. The second is piston #1. The last is the problem child #5. The purple is the factory stamping. The orange is either the factory arrow or where it should be and pointing to the front of the engine. The green is the factory valve relief. And the red is the new expanded valve relief. So you can see if I flip #5 and put it in the proper orientation the new relief is useless. And leaving it alone is no good because like Half-inch said I don't want metallic gravy for oil. But it's looking more and more like these reliefs were actually necessary. Was given some bad advice many years ago. So in the next few days I'll flip the piston and reinstall it and check the clearance. If it works it works. If it doesn't so be it and I'll move on to another option.
__________________
67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s |
| The Following User Says Thank You to 67 455 Bird ragtop For This Useful Post: | ||
|
#2
05-04-2020, 09:58 PM
|
||||
|
||||
|
I still wouldn't worry about it.
That cylinder may have a very minute amount of HP more than the others. You would never know or feel the difference. The main thing is that the rod main journal be facing the right way. 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
|
#3
05-04-2020, 10:16 PM
|
||||
|
||||
|
Quote:
__________________
67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s |
| Reply |
| Thread Tools | |
| Display Modes | |
|
|
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.
Hybrid Mode
