FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#81
|
||||
|
||||
I need to make a correction to my statements above.
The cam I have is the 702 and NOT a 703. They say something is the first to go as you get older, but I can't remember what it is.... On another note: I installed the TCI 2400 converter last week & it seems to be a good match. No hard clunking into gear or surging sitting at a light. (Idles around 800 rpm) Foot braking like I was staging @ the starting line will over power the 4 wheel disks & push the car forward around 1500 rpm. Vacuum is 14" @ idle in gear & 20"+ at cruise.
__________________
No! Do not try! Do! Or do not. There is no try. - Yoda 1967 Firebird Restoration 2005 - 1/25/2017 |
#82
|
||||
|
||||
The 389 is finally alive! Breaking in the cam went fine even with 135lbs seat pressure. The idle is a little rough at 800rpm but not extreme. Rpm in gear is 550rpm and vacuum is 14in/hg in Neutral/Park. The cam works fine and pulls great between 2500-5000+rpm. Works good from 1500rpm but dosen't like to bog down below 1100pm in 4th gear. Initial timing is 12° haven't checked total timing yet. The exhaust was a little to loud for my taste with ported logs (2.2" outlets), Pypes 2.5" downpipes, 2.5" Cherry Bomb Vortex and 2" tail pipes. I have a few issues to work out before I take her out for a longer test drive but I'm pleased so far!
__________________
1960 Bonneville 2dr HT 389/400ci 363hp 1965 Bonneville 2dr HT 455/501ci stroker 600hp+ |
#83
|
|||
|
|||
For interest consider removing a few springs and measure the amount of loss from the initial run in.
.
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#84
|
||||
|
||||
After some more testing, adjusting the carb and backed of the timing some I don't know if this cam will work with the old Hydramatic transmission. To get smooth engagement when shifting to drive or reverse the idle in park/neutral needs to be below 800rpm. The idle in gear then gets below 500rpm with the engine running rough with only 6" of vacuum (14" in neutral @800rpm). With a TH350 and 2500 stall converter this would not be a problem but the converter in the Hydramatic is really tight. I don't know how much Rhoads lifters would help? I really like the Voodoo 703 but I should probably have gone with the 702 or Crower 60916 with this transmission.
__________________
1960 Bonneville 2dr HT 389/400ci 363hp 1965 Bonneville 2dr HT 455/501ci stroker 600hp+ |
#85
|
||||
|
||||
Steve, if I end up with changing the cam I will remove a couple of springs and measure the spring pressure.
__________________
1960 Bonneville 2dr HT 389/400ci 363hp 1965 Bonneville 2dr HT 455/501ci stroker 600hp+ |
#86
|
||||
|
||||
You have made a lot of progress.
500 rpm is a pretty low idle in a 389 with the 703. That would take some pretty good tuning to make it responsive. A set of Rhoads vmax or vpro the 500 rpm should not be an issue if you set them right. We have made bigger cams than the 703 idle like 2 bbl cams with Vmax Rhoads. An original Rhoads may do it too, but they do not have any adjustment. |
Reply |
|
|