Pushrod Length Help

fmaster7 · January 21st, 2012, 03:21 PM

I measured using the length checker. I did a 1/2 turn on the rocker nut and I got the measurement 6.417.

Now im confused...Should I go with 6.400 pushrods or 6.375 to compensate for the lifter preload, or doing the 1/2 turn already preloaded the lifters and I should just order the 6.400's ?

Setup is hyd roller cam, hyd roller lifters and 1.7 cobra rockers.

e3sean · January 21st, 2012, 03:31 PM

how does the pattern on the valve look when you turn it over?

fmaster7 · January 21st, 2012, 03:37 PM

It looks absolutely perfect. Directly in the middle. I used a black marker.

So that why im stumped. If it looks / works at 6.417 then should I just use a 6.400 pushrod?

e3sean · January 21st, 2012, 03:52 PM

if it looks absloutly perfect and its sitting at a 6.417 then i would get a pushrod as close to 6.147 as i could....

if you can put the 6.4 in there and it still looks perfect then use that if you have them.

fmaster7 · January 21st, 2012, 03:57 PM

Ok sounds good. So when i torque the rocker, that "preloads" the lifter?

e3sean · January 21st, 2012, 04:05 PM

yes you are supposed to tighten it to the point where you cant free spin the pushrod then tighten it 1/4 turn then lock it and torque it. byt the time you do that it will turn into about 1/2 turn.

fogged306 · January 21st, 2012, 04:11 PM

Wait, cobra rockers are pedestal mount. So to get the right preload you have to add to your length. Also how are you checking, with checking springs or are you flipping the plunger in the lifter or using a solid lifter?

e3sean · January 21st, 2012, 04:24 PM

Originally Posted by fogged306

Wait, cobra rockers are pedestal mount. So to get the right preload you have to add to your length. Also how are you checking, with checking springs or are you flipping the plunger in the lifter or using a solid lifter?

shit thats right i forgot about cobra rockers being pedistal mount.. im not used to all these low end parts anymore its jesel shaft mount or nothing for me... lol

you will need to buy a shimm kit from ford to use the cobra rockers in order to get the correct valve geometry most times.

and in order to check the geometry you are supposed to be using a solid lifter or what i do is take 2 stock ones and tack weld the tops from moving then measure the leingth you need (with the shimm kit to move the rocker up and down)

69fastback · January 21st, 2012, 05:05 PM

^^^^^ look who came out of the woodwork

e3sean · January 21st, 2012, 08:22 PM

i was wondering if anyone would notice lol. i stop by from time to time. im busy with alot of other things. well im still deployed hopefully be back in the next month or two.. my house has been robbed twice scince ive been here and my wifes truck got broken into last week so i had to have her window replaced..

when i get back i got the go ahead from my asome wife to buy a miller dynasty 200dx tig welder and im gonna sell my race car trailer and buy more shop equipment to start doing some fab work. and im gonna put the orange beast back on the street 14:1 compression street car.. lol should be fun. proly gonna sell the c4 and put a t56 in it as well.

69fastback · January 21st, 2012, 08:28 PM

Originally Posted by e3sean

i was wondering if anyone would notice lol. i stop by from time to time. im busy with alot of other things. well im still deployed hopefully be back in the next month or two.. my house has been robbed twice scince ive been here and my wifes truck got broken into last week so i had to have her window replaced..

when i get back i got the go ahead from my asome wife to buy a miller dynasty 200dx tig welder and im gonna sell my race car trailer and buy more shop equipment to start doing some fab work. and im gonna put the orange beast back on the street 14:1 compression street car.. lol should be fun. proly gonna sell the c4 and put a t56 in it as well.

Wow man, I hate to hear all that. F'ing thieves. I hate them. Be sure to share your fab work with us. I'd love to see it. My car just got a cage, nitrous, and a C4, and you're going backwards. Funny how hat works...lol

e3sean · January 21st, 2012, 08:46 PM

ya since i moved from arizona to north carolina i kinda lost intrest in racing. i went to the local track and it just wasnt fun without the people who i used to race with. and it is only 1/8th mile. i was spoiled before having a 1/4 mile track 10 minutes from home. its expensive to haul a 24 foot trailer an hour to get to the track, burn 8 gallons of 114 then haul it home.. it would cost me $200 to make three 9 second passes. for $200 i could take me and my wife out on a buddys charter boat and go fishing for sailfish/dolphin for 8-10 hours.

im not really going backwards my car will still have a cage and it will still be fast but i converting it to e85 and ill put a bigger fuel tank in it and re wire the lights so they function. if i can shift it good it should still run a high 9 on the nitrous. but be able to drive back and forth as well.

69fastback · January 21st, 2012, 08:53 PM

Yeah, I understand. It's definitely expensive. I live 60 miles from the track, but I can still drive my car around on 91. I'm hoping on the transbrake I can run low 10s on the bottle. Maybe click off a 9 if I get real lucky. Obviously, I won't be spraying it on 91, but when I haul it back home, it goes 100% street duty. I'll just have to see how well that Chance converter works once I get it going again.

e3sean · January 21st, 2012, 09:01 PM

ya im kicking myself in the ass cause i just spent alot of money on an 8" hughes converter... no matter if i keep the c4 or switch to a manual its gotta come out..

69fastback · January 21st, 2012, 09:03 PM

Ohhh you're car has a glide, doesn't it? Yeah that sucks.

e3sean · January 21st, 2012, 09:07 PM

no it has a c4 it used to have a glide but i never got it to work right so i sold the glide. i have an 8" converter on the c4.

69fastback · January 21st, 2012, 09:14 PM

Oh I see. Don't want to cruise the street on the 8" converter? Lol. I'm curious to see how this one works with my car, since it wasn't built for it, but of it doesn't like it, I'll send it back to Chance for a restall. It's free to try. Lol

e3sean · January 21st, 2012, 09:19 PM

ya the 8" converter has way too much stall (5000) it generates alot of heat. and its too small to get to stall much lower then 4500. i would proly switch to a 10" if i stayed with the auto. but i would really rather have the manual.

ya most places when you buy a converter give you one free restall. converter builders are only as good as the information they recieve. there are so many vearibles that play into where a converter will stall that they almost never get them spot on first try. but once you put it in the car and hit the transbreak with no revlimiter and find out where it is dead stalling they can re adjust your fin angel and get it almost dead nuts on the second time.

69fastback · January 21st, 2012, 09:31 PM

Yeah, i know chance does good work too. I got this one from my buddy with the PA Supercomp C4, scattershield, JW bellhousing, and shifter all for $2K. Can't beat it considering that converter was $1800. His car weighed 2700 lbs, and made 790 HP on the motor, and had 2 kits on that. It flashed at 5400 in his car. Mine makes 520-530 ish, and weighs 3500 lbs, so maybe it'll all work out. About a 4000 flash would be ok for me. We will see I guess. I think it'll be way tight in my car. Even if I have to pay for a restall, it's only about $700. That's cheap, considering the cost of the converter.

e3sean · January 21st, 2012, 09:36 PM

4000 will not be too tight if you plan to drive it on the street. i wouldnt want to go any higher then 4000 unless you plan on putting a radaitor size cooler on that thing with dedicated fans lol.

January 21st, 2012, 03:21 PM	#1
fmaster7 Regular Join Date: Jul 2009 Posts: 178 iTrader: 0 reviews	Pushrod Length Help I measured using the length checker. I did a 1/2 turn on the rocker nut and I got the measurement 6.417. Now im confused...Should I go with 6.400 pushrods or 6.375 to compensate for the lifter preload, or doing the 1/2 turn already preloaded the lifters and I should just order the 6.400's ? Setup is hyd roller cam, hyd roller lifters and 1.7 cobra rockers.

January 21st, 2012, 03:31 PM	#2
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	how does the pattern on the valve look when you turn it over? __________________

January 21st, 2012, 03:52 PM	#4
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	if it looks absloutly perfect and its sitting at a 6.417 then i would get a pushrod as close to 6.147 as i could.... if you can put the 6.4 in there and it still looks perfect then use that if you have them. __________________

January 21st, 2012, 04:05 PM	#6
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	yes you are supposed to tighten it to the point where you cant free spin the pushrod then tighten it 1/4 turn then lock it and torque it. byt the time you do that it will turn into about 1/2 turn. __________________

January 21st, 2012, 05:05 PM	#9
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	^^^^^ look who came out of the woodwork __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

January 21st, 2012, 03:37 PM	#3
fmaster7 Regular Join Date: Jul 2009 Posts: 178 iTrader: 0 reviews	It looks absolutely perfect. Directly in the middle. I used a black marker. So that why im stumped. If it looks / works at 6.417 then should I just use a 6.400 pushrod?

January 21st, 2012, 03:57 PM	#5
fmaster7 Regular Join Date: Jul 2009 Posts: 178 iTrader: 0 reviews	Ok sounds good. So when i torque the rocker, that "preloads" the lifter?

January 21st, 2012, 04:11 PM	#7
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Wait, cobra rockers are pedestal mount. So to get the right preload you have to add to your length. Also how are you checking, with checking springs or are you flipping the plunger in the lifter or using a solid lifter?

January 21st, 2012, 08:22 PM	#10
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	i was wondering if anyone would notice lol. i stop by from time to time. im busy with alot of other things. well im still deployed hopefully be back in the next month or two.. my house has been robbed twice scince ive been here and my wifes truck got broken into last week so i had to have her window replaced.. when i get back i got the go ahead from my asome wife to buy a miller dynasty 200dx tig welder and im gonna sell my race car trailer and buy more shop equipment to start doing some fab work. and im gonna put the orange beast back on the street 14:1 compression street car.. lol should be fun. proly gonna sell the c4 and put a t56 in it as well. __________________

January 21st, 2012, 08:46 PM	#12
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	ya since i moved from arizona to north carolina i kinda lost intrest in racing. i went to the local track and it just wasnt fun without the people who i used to race with. and it is only 1/8th mile. i was spoiled before having a 1/4 mile track 10 minutes from home. its expensive to haul a 24 foot trailer an hour to get to the track, burn 8 gallons of 114 then haul it home.. it would cost me $200 to make three 9 second passes. for $200 i could take me and my wife out on a buddys charter boat and go fishing for sailfish/dolphin for 8-10 hours. im not really going backwards my car will still have a cage and it will still be fast but i converting it to e85 and ill put a bigger fuel tank in it and re wire the lights so they function. if i can shift it good it should still run a high 9 on the nitrous. but be able to drive back and forth as well. __________________

January 21st, 2012, 08:53 PM	#13
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Yeah, I understand. It's definitely expensive. I live 60 miles from the track, but I can still drive my car around on 91. I'm hoping on the transbrake I can run low 10s on the bottle. Maybe click off a 9 if I get real lucky. Obviously, I won't be spraying it on 91, but when I haul it back home, it goes 100% street duty. I'll just have to see how well that Chance converter works once I get it going again. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

January 21st, 2012, 09:01 PM	#14
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	ya im kicking myself in the ass cause i just spent alot of money on an 8" hughes converter... no matter if i keep the c4 or switch to a manual its gotta come out.. __________________

January 21st, 2012, 09:03 PM	#15
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Ohhh you're car has a glide, doesn't it? Yeah that sucks. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

January 21st, 2012, 09:07 PM	#16
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	no it has a c4 it used to have a glide but i never got it to work right so i sold the glide. i have an 8" converter on the c4. __________________

January 21st, 2012, 09:14 PM	#17
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Oh I see. Don't want to cruise the street on the 8" converter? Lol. I'm curious to see how this one works with my car, since it wasn't built for it, but of it doesn't like it, I'll send it back to Chance for a restall. It's free to try. Lol __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

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January 21st, 2012, 09:19 PM	#18
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	ya the 8" converter has way too much stall (5000) it generates alot of heat. and its too small to get to stall much lower then 4500. i would proly switch to a 10" if i stayed with the auto. but i would really rather have the manual. ya most places when you buy a converter give you one free restall. converter builders are only as good as the information they recieve. there are so many vearibles that play into where a converter will stall that they almost never get them spot on first try. but once you put it in the car and hit the transbreak with no revlimiter and find out where it is dead stalling they can re adjust your fin angel and get it almost dead nuts on the second time. __________________

January 21st, 2012, 09:31 PM	#19
69fastback Premium Member 1969 Mustang Mach 1 6.824@101.61 Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 5,565 iTrader: 0 reviews	Yeah, i know chance does good work too. I got this one from my buddy with the PA Supercomp C4, scattershield, JW bellhousing, and shifter all for $2K. Can't beat it considering that converter was $1800. His car weighed 2700 lbs, and made 790 HP on the motor, and had 2 kits on that. It flashed at 5400 in his car. Mine makes 520-530 ish, and weighs 3500 lbs, so maybe it'll all work out. About a 4000 flash would be ok for me. We will see I guess. I think it'll be way tight in my car. Even if I have to pay for a restall, it's only about $700. That's cheap, considering the cost of the converter. __________________ ./___ _ ____ ___ \. ( ]]] _ _ O _ _ [[[ ) \_ o _ _____ _ o _/ \|___\| ......... \|___\| http://www.youtube.com/watch?v=HyYU3...e_gdata_player

January 21st, 2012, 09:36 PM	#20
e3sean I Post Entirely Way Too Much 1988 lx 9.68@142 Join Date: Nov 2007 Location: goldsboro NC Posts: 5,609 iTrader: 0 reviews	4000 will not be too tight if you plan to drive it on the street. i wouldnt want to go any higher then 4000 unless you plan on putting a radaitor size cooler on that thing with dedicated fans lol. __________________

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