Randystys
Member
Hey I'm Randy, I've been so busy digging through the posts and cross posts on tuning a tunnel ram I never noticed that there was a current forum going on, I thought this was all archived information...
My project is a frame up hot rod '66 El Camino... 383 aluminum heads, weiand tunnel 2x Holley 450, big mother thumper cam, Muncie 4 speed, 4.11 posi traction, 4 link, tubbed, lowered 4" .
I got it up and running, now in the process of dialing it in, smoothing it out best I can for the street/strip.
I don't expect a mom's car grocery getter temperment with the cam I have in there, but want better than the full blown all or nothing race mode I have now. Looking for tips and tricks and tuning.
I have lots of pictures but I guess I have to figure out how to shrink them down to 500k to load here.
(Edit: I'm going to cut and paste some previous Posts and Picsfor reference)
I have the Muther Thumper cam Grumpy says "not the best for this application"
Damn... probably explains why I'm struggling to smooth it out and get good transition...
But I thought it fit in the ranges grumpy listed in his thread:
106-109 LSA I have 107
245-300 duration i have 295
Lift is what, .500 /.490?
I have 10.5:1 flat top small chamber (I believe 64) aluminum head compression.
If that cam is the total dog, wrong ass, ain't gonna happen, ilI' pull it out and try your suggestion.
If itsi more like it'll work but there's better cams out there... Id like to work with what I have for this summer and change it out next fall...
Other Stuff I Have in and done
6.5 power valve
68 jets (might be 72)
31 squirters
50cc pumps
4160s
Mechanical secondary matched opening.
Right at the moment 850-900 rpm idle
11.4-12.6:1 f/a idle
6-8 psi idle
I have not drilled flaps yet
20* initial timing
Grumpy says "Id adjust the fuel pressure regulator to provide 5psi -5.5 psi at the carb inlet port
as a first step, and adjust the jets to get closer to about 13.5-14:1 fa ratio at idle"
So that's where we left it last week or so ago...
I should mention I'm 61 yo and I built this over the last two years as retro hotrod of what I would have built back in my high school days had I the money and the wearwithal.
I don't plan on any "serious" strip work built mostly for show(s) and cruising the bullivard so lumpy idle fits in the picture as long as I can get driveability out of it...
What I'm saying is I'm not looking for top performance on the strip. Although I might take a run down the 1320 just for grins...