Engine Please Help

03Eastside · Oct 7, 2015

Hi I'm current installing my Holly systematic intake manifold on my aluminum heads . For some reason my bolts keep snapping I torque the first set of bolts to 7lbs then I went to 14lbs and two of them snap . On my intake manual its says 22-24 lbs . I don't know what I'm doing wrong this is the first time I have done this if anyone can please help thanks .

84Ttop · Oct 7, 2015

I never ever torque intake bolts, I've seen plenty of guys strip heads and break bolts doing so. If they are tight they are tight in my opinion. I typically tighten the bolts by hand (ratchet) and check them after the motor has had a few heat cycles in it.

03Eastside · Oct 7, 2015

84Ttop said:
I never ever torque intake bolts, I've seen plenty of guys strip heads and break bolts doing so. If they are tight they are tight in my opinion. I typically tighten the bolts by hand (ratchet) and check them after the motor has had a few heat cycles in it.

Did you ever have any over heating issues or any leaks ?

84Ttop · Oct 7, 2015

03Eastside said:
Did you ever have any over heating issues or any leaks ?

Never, I've had the intakes off of a few hundred of these cars without issue

. I use a small amount of RTV on the water passages and "Right Stuff" on the front and back of the lower manifold

03Eastside · Oct 7, 2015

84Ttop said:
Never, I've had the intakes off of a few hundred of these cars without issue . I use a small amount of RTV on the water passages and "Right Stuff" on the front and back of the lower manifold

Thanks man

jrichker · Oct 7, 2015

Are you using rusty bolts? Or maybe cheap Chinese imitation bolts?

Look at the bolt heads you should see at least a 3 pointed star like the Mercedes-Benz hood ornament. The 3 point star is a grade 5 bolt and is the minimum that I would use on anything automotive.

Use a tap or preferably a thread chaser to clean out the bolt holes. The threads on the bolts for the intake manifold are 5/16-18. Use lots of WD40 when you clean the threads, squirt as you turn. Use the red soda straw to squirt some WD40 in the bolt holes after you have run the thread chaser or tap through them to flush out any rust, dirt or scale you cut loose..

Homemade thread chaser - if you have one of the handheld small cutoff tools with a 3/32" or 1/16" thick wheel you can do this:

bad86capri1 · Oct 13, 2015

Make sure your torque wrench is right. It could be out of calibration and make sure you're setting the torque setting right as well

stykthyn · Oct 13, 2015

bad86capri1 said:
Make sure your torque wrench is right. It could be out of calibration and make sure you're setting the torque setting right as well

Big difference in foot pounds vs inch pounds.

03Eastside · Oct 13, 2015

jrichker said:
Are you using rusty bolts? Or maybe cheap Chinese imitation bolts?

Look at the bolt heads you should see at least a 3 pointed star like the Mercedes-Benz hood ornament. The 3 point star is a grade 5 bolt and is the minimum that I would use on anything automotive.

Use a tap or preferably a thread chaser to clean out the bolt holes. The threads on the bolts for the intake manifold are 5/16-18. Use lots of WD40 when you clean the threads, squirt as you turn. Use the red soda straw to squirt some WD40 in the bolt holes after you have run the thread chaser or tap through them to flush out any rust, dirt or scale you cut loose..

Homemade thread chaser - if you have one of the handheld small cutoff tools with a 3/32" or 1/16" thick wheel you can do this:

Thanks man I ended up bolting then down with a rachet but I think you are right I need to go back and an run tap thru them .

03Eastside · Oct 13, 2015

I'm sorry guys can you please help me with one more thing . On the intake it has those 3 adaptor for hoses but I don't know we're the hoses go my motor does not have those extra houses . It also has a female outlet for a adapter I figured that one of them is to run a hose all the way back to the pcv valve im not sure , and the one coming out of the fuel regulator I don't know were to plug this one .

stykthyn · Oct 13, 2015

One to pcv, one to egr, third to the vacuum tree. You also need one for the fuel pressure regulator. Grab a y fitting.

03Eastside · Oct 14, 2015

stykthyn said:
One to pcv, one to egr, third to the vacuum tree. You also need one for the fuel pressure regulator. Grab a y fitting.

The one in the front closer to the radiator run a hose to the pcv? Then the remaining outlets on the intake toward the firewall connected to fuel pressure regulator and egr? does it matter in the way I connected them ? Thanks again im a novice at those things and afraided I'll connected something wrong .

jrichker · Oct 14, 2015

Diagrams courtesy of Tmoss & Stang&2birds

Vacuum diagram 89-93 Mustangs

03Eastside · Oct 20, 2015

By any chance does any one of you have a picture of the set up? I have the pcv hose hook up already , I ran a hose from the front of the intake to the back of the pcv . I have the fuel regulator , egr , and valve cover breather left . Do I just connect them anywhere and plug off the ones I don't need ?I thought of doing this but don't want my car to have a roght idle . I'm sorry for all the questions I am a novice at all this , and can't seem to have a friend or anyone who can help me . Thanks for all the patience and help .

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Engine Please Help

03Eastside

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84Ttop

They make new pistons every day, so why worry?

03Eastside

84Ttop

They make new pistons every day, so why worry?

03Eastside

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I want to measure mine. It doesn't look that tall.

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I want to measure mine. It doesn't look that tall.

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