need help with sbc

http://www.summitracing.com/parts/HLY-36-181/?rtype=10

hly-36-181.jpg


viewtopic.php?f=44&t=777&p=4546&hilit=+power+valve+vacuum#p4546

viewtopic.php?f=55&t=1639&p=4545&hilit=+power+valve#p4545
 
Id suggest starting by going 2 sizes SMALLER on the JETS
and verifying the float levels and fuel pressure at the carb inlet port is at 5.5 psi MAX, if its higher than that you need a return style fuel pressure regulator
get out a vacuum gauge and read the vacuum at idle and install a power valve thats as close as you can get too 1/2 the value, IE if the vacuum gauge reads lets say 16.6" youll want a 7.5-
power valve

viewtopic.php?f=55&t=211

viewtopic.php?f=55&t=635
 
ive got to get to town and buy some new gaskets and jets so it will be a day or 2 before i can continue. thanks for the help thus far.
 
ok got it put back together and then it wouldnt idle( crank up and then shortly go down till she finally shut off) so i started looking at fuel related issues and found nothing so i pulled the valve covers and backed the rocker nuts off a bit and bam, we are running again. so now i guess i need to figure out why it did that first, then figure out my fuel issue( or cam issue). anyone have any idea why after about 5 days of this thing running flawlessly it would suddenly tighten its own rocker nuts down, or the best way to adjust while its running?
 
ok went to adjust the rockers and noticed that i am only getting oil on 2 of the rockers(through the pushrods) and they are clicking(loose) when i tighten them using my fingers just at the point where they stop clicking i loose my oil, so i try loosening the others and most all of them do the same. is it possible that my lfter are bad or am i not seeing things correctly?
 
Assuming your using hydraulic lifters,you need to loosen any rocker to the point it clicks,at idle, noticeably, then slowly tighten the adjustment nut on the rocker just to the point the rocker stop clicking then add an additional 1/4 turn of pre-load, this allows the lifters push rod seat to move enough to depress , and force oil up the push-rods as the lobe rotated under the lifter

15-Exploded2.jpg

hydrauliclifter.jpg

oilpassage.jpg
 
Ok that's what I was doing, but at the same point it stop clicking, the oil stops coming. Is it supposed to stop oiling?
 
no not all, but right now i have no oiling through the pushrods. if i loosen the rockers, some will bleed oil, some will not.
 
oil level good, 50 psi @ idle manual gauge in the top rear by the dist. could it be bad lifters or not. thinking i may have to pull the lifters apart
 
I hope you correctly labeled EACH one and where it goes back into the block or theres a good chance youll screw up the cam, in the next hundred miles
 
grumpyvette said:
I hope you correctly labeled EACH one and where it goes back into the block or theres a good chance youll screw up the cam, in the next hundred miles
even with roller lifters?
 
383rookie said:
grumpyvette said:
I hope you correctly labeled EACH one and where it goes back into the block or theres a good chance youll screw up the cam, in the next hundred miles
even with roller lifters?

good catch,your correct,
SORRY,I was answering 3 different posts and forgot that yours was a roller lifter
no, your probably ok with roller lifters,
its rare, but not unheard of for those to cause wear issues
camlobe2.jpg
 
thanks for clarifying for me, please dont scare me like that, ive already got way to much money in this project. btw do you think that i would be better off with 1.5 rockers to down size my cam or is it ok the way it is? my goal is to make the most torque i can at 5800 rpm.
 
Back
Top