push rod length ????

cop-coupe · 05-12-2002, 01:19 AM

O.K. this is really %&*#@%* with my mind, I took my gt40 heads, which have indy cylinder head 1.6 rrs off of my old motor put them on my new motor, installing new crane push rods that are the same length as my old ones, also used the same came as before (had just a few miles on it) and now I don't have enough adjustment on my rocker arms to tighten them up(not even close) what the &%$# am I missing. It seams to me they should adjust up just the same or close as before........ thanks for the help...

PKRWUD · 05-12-2002, 05:15 AM

Same lifters too?

How did you set the preload?

Take care,
-Chris

cop-coupe · 05-13-2002, 04:32 PM

I used new lifters, they are stock replacement lifters I did not compare them side by side but I am pretty sure they are the same length.

now about pre load I have no idea what that exactly means, I took the lifters out of the box put assembly lube on them and put them in, before I tried to adjust the rockers I used a 1/4" socket, extension, and my cordless drill in reverse to turn the oil pump to pressurize the lifters, I did this on the suggestion of a tech guy at Summit.

If I try to adjust the intake just as the exhaust starts to open the adjustment screw goes down far enough to stop the push rod from turning put the adj. screw is so far down into the rocker that the jam not has no threads to attach too.

Is it possible for my new block to be different in some way to cause the push rods to be longer, every thing else so far seams to fit just fine, timing chain, and intake I test fitted last night just incase and they all fit just fine. If I need to go with a longer push rod how do I determine how long a push rod I need....

thanks for any help you can give..
Kevin

LX XLR8R · 05-13-2002, 06:24 PM

so you are using all your old stuff besides the block and you have new pushrods and new lifters..
i have heard that not all lifters are the same size..check that and check to make sure the push rods are the same size..other than that make sure the rockers are flat on the heads
was this a roller motor b4?we are not talking about a 69ish motor are we??
check the old stuff with newe stuff 1st

cop-coupe · 05-14-2002, 04:25 PM

It was not originaly a roller motor but how do I tell the model year of the block. thanks

05-12-2002, 01:19 AM	#1
cop-coupe Registered Member Join Date: Apr 1999 Location: belleville IL. Posts: 60	push rod length ???? O.K. this is really %&#@% with my mind, I took my gt40 heads, which have indy cylinder head 1.6 rrs off of my old motor put them on my new motor, installing new crane push rods that are the same length as my old ones, also used the same came as before (had just a few miles on it) and now I don't have enough adjustment on my rocker arms to tighten them up(not even close) what the &%$# am I missing. It seams to me they should adjust up just the same or close as before........ thanks for the help...

05-12-2002, 05:15 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Same lifters too? How did you set the preload? Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

05-13-2002, 06:24 PM	#4
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	so you are using all your old stuff besides the block and you have new pushrods and new lifters.. i have heard that not all lifters are the same size..check that and check to make sure the push rods are the same size..other than that make sure the rockers are flat on the heads was this a roller motor b4?we are not talking about a 69ish motor are we?? check the old stuff with newe stuff 1st __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

05-14-2002, 04:25 PM	#5
cop-coupe Registered Member Join Date: Apr 1999 Location: belleville IL. Posts: 60	It was not originaly a roller motor but how do I tell the model year of the block. thanks __________________ 1990 spec. serv. coupe w/306 (Indy Perf. Mustang Not Recomended), C-4 w/3000 stall, b-303, gt-40 heads and intake, 1.6rr, 1" spacer, fms valve covers, mac cold air intake, bbk equil shorties, Mac pro chamber, 2.5" flows, under drives, 65mm t.b. , fms 9mm wires, trunck mount battery, 24lb inj., 73mm C&L, 155lph pump. msd digital 6a, flex-a-lite,

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Speed secret # 5	jim_howard_pdx	Windsor Power	37	11-15-2002 12:19 PM
Push Rod length	347powered	Windsor Power	3	03-10-2002 09:00 PM
TFTW heads and push rod lengths?	Rev	Classic Mustangs	4	11-23-2001 07:50 AM
push rod length for a 351 head on a 302	John Cummins	Windsor Power	1	10-04-2001 06:22 AM
full length or standard length subframe connectors?	84stangLX	Windsor Power	4	04-23-2001 03:48 PM

05-13-2002, 04:32 PM	#3
cop-coupe Registered Member Join Date: Apr 1999 Location: belleville IL. Posts: 60	I used new lifters, they are stock replacement lifters I did not compare them side by side but I am pretty sure they are the same length. now about pre load I have no idea what that exactly means, I took the lifters out of the box put assembly lube on them and put them in, before I tried to adjust the rockers I used a 1/4" socket, extension, and my cordless drill in reverse to turn the oil pump to pressurize the lifters, I did this on the suggestion of a tech guy at Summit. If I try to adjust the intake just as the exhaust starts to open the adjustment screw goes down far enough to stop the push rod from turning put the adj. screw is so far down into the rocker that the jam not has no threads to attach too. Is it possible for my new block to be different in some way to cause the push rods to be longer, every thing else so far seams to fit just fine, timing chain, and intake I test fitted last night just incase and they all fit just fine. If I need to go with a longer push rod how do I determine how long a push rod I need.... thanks for any help you can give.. Kevin