View Full Version : Advise for next move w/ my car
I have a 72 Nova weighs 2878 ,412 sbc brodix Track 1 heads,4.56 gears 10.5 x 29.5 tire . I don't know much about internals other than it's a roller cam, steel crank which doesn't help any in my decision making because of the unknown.
Here's the deal it has a powerglide w/ 5200 stall car runs 10.60 all day but i'm running out of motor about 2 cars from the end of the quarter. I'm crossing the line @7100-7200rpm i don't like running car at max every pass.Oh almost forgot it's a 10 bolt rearend
I know i can go to 4.11 gears but i don't want to slow the car down what other options do i have.
Can i go w/ a custom grind roller cam to turn up around 7300rpm or what
any ideas or opions welcome & appreciated.
bjuice
10-09-2009, 04:55 PM
see if they make a 4.29 or 4.30 gear to fit that 10 bolt carieer...that will knock about 250 to 300 rpm out of it....
or if you can go to a 33 inch tall tire..it would work out close to the same thing...about the same Money but less hassle.
That's part the problem don't make 4.30 for 10 bolt and I can't go w/ bigger tire car is backhalfed but it's diameter I have fender issues
FullTimeRacing
10-09-2009, 07:01 PM
go as big as you can on the tire.
or it is time to trim the fender.
get offset wheels.
if not let it screem
zipper06
10-09-2009, 09:29 PM
if it's a big 10 bolt==8.5 they make all kinds of gears for it, if it's 8.2 you're right they don't make a 4.30. you can tell which one it is by the nut size on the pinion, if it's 1 1/8" it's an 8.2, if it's a 1 3/8" it's a big 10== 8.5.
Zip.
If it is a 8.5, go here.
http://www.rearendparts.com/product.php?productid=1566&cat=528&page=1
Thanks a bunch not sure what size it is but will check.
Appreciate the input
bbchevy
10-10-2009, 07:01 AM
Something Else You MIGHT want to Check?
VALVE Springs?
Seems that your combo should go up a Bit Higher than where is STOPPING?
Later
G 8)
fla1976
10-10-2009, 08:03 AM
I went with the Hoosier tires because it was the biggest tire for the 10 inch rim when I was looking for tires. It had a 13.5 inch section width and 11 inches on the ground. I had to stretch the wheelwells and could run a taller tire but the clearance in the width was the problem. The limiting factor was the diameter and the smallest section width with the tallest tire is what you want. Phoenix made a 31 inch tall tire but the Hoosier was a 29.5 x 10.5W tire that was 30.7 tall. The wheel well was stretched 4 inches so a taller tire was no problem. I couldn't get a wider tire on it. I had a little over an inch clearance on each side of the tire and ran 6.5 psi.
http://img190.imageshack.us/img190/8172/stretchd.jpg
Something Else You MIGHT want to Check?
VALVE Springs?
Seems that your combo should go up a Bit Higher than where is STOPPING?
Later
G 8)
Yeah kinda thinking it could be valve float cause it seems to be pulling up to the point that it starts popping but hard to tell if it's valve float or just out cam@ that rpm
LuckyDawgRacing
10-10-2009, 03:58 PM
what kind of fuel system?
LuckyDawgRacing
10-10-2009, 03:58 PM
and whats the timing
Quick fuel 850 Mallory fuel pump
32 deg. Base
wrightway
10-11-2009, 08:19 AM
I don't know much about internals other than it's a roller cam.
Is the roller solid or hydraulic? If it hydraulic theirs your problem
Ok i have some new info. just exhausting all possiblitlies
I pulled altenator so i can actually see the pointer & balancer its showing 32deg. base & advancing to 52 degs. ok the obvious is way too much total timing so i have a few questions.
#1 could too much timing be the prob. of car running out of motor on the top end.
#2 if answer to #1 is yes then why doesn't it effect the car anywhere else it leaves well i'm shifting at 7000 it pulls all the way no issues like on top end ( its advancing almost instantly very light springs)
#3 I kind of think its maybe the wrong balancer i did put it on TDC & it was zero'ed on blancer & pointer though.( could balncer be too small which would throw actual timing off) I didn't think the car would run well at ldel w/ 32degs of timing.
#4 if its in fact too small a balancer then i'll never really know the actual timing & need to adj. from where its at but the car didn't want to run in gear when i 1st got it so w/ out checking the timing i marked the block & distr. and advanced it maybe an 1/8th of an inch & it woke up & runs prefect so that kind of tells me something not right cause the car should run base timing of 10-12degs. input is welcome i'm not a mech just learning.
FullTimeRacing
01-22-2010, 08:40 AM
what's the 60' times?
the blancer size wont make your timing off 360* is 360* no matter the diameter.
your cam may be to small.
you may want to get a lock out dizzy.
Don't remeber exactly i think around 1.45 kinda slow , i might lock it out after a litle more playing some test & tune will tell tale. My time slips are at my shop i'm stuck at work for a while.
FullTimeRacing
01-22-2010, 11:16 AM
without knowing the cam specs you really can't go further.JMO
It's kinda like you got what you got,untill you take it apart.
10.60 aint nothing to shake a stick at.
oldandtired
01-22-2010, 11:28 AM
without knowing the cam specs you really can't go further.JMO
x2
Get a dial indicator and pull the drivers valve cover and #1 plug.
1. Check to see if it's solid or hydraulic. If Hydraulic, adjust to no slack:
a. Find TDC and verify your harmonic balancer pointer location.
b. If your harmonic is degreed, check for duration.
c. Measure total lift.
d. If hydraulic, don't forget to back rocker nut down to previous lash set up.
Good luck and keep us posted
Dave
Thanks for the help i have a long story to make it short i know this motor was recently refreshened the guy just didn't remember cam info. as he sold it then i bought it from the guy he sold it to only has about 40 passes on motor. I before buying this had a ton of trouble w/ a late model muscle car had a motor built had to pull it 3 times due to several different issues finally on the 1st race weekend w/ 3rd new motor found it had a crack in the #2 cylinder make core block should have never been used well mach. shop made it good but my wife said sell that piece of crap buy another car or get out of racing altogther so i bought this Nova & car runs well had no real mech. probs. as of yet so i don't want to tear it apart just yet & or spend a ton of money i'll play w/ timing and see if not i'll let it scream & next winter it will be torn apart