Adding speed engineering headers
TECH Senior Member
Joined: Jun 2016
Posts: 22,297
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From: Central Cal.
Your posts are always about common sense (NOT really all that common now, it seems...), and I always enjoy reading them, because I always seem to learn something, Your 20 years as a tech might have a wee bit to do with that, huh? Take it easy man!
I do a lot of theory testing too instead of assuming/repeating what people say that was repeated from someone..
Have a good one, time to go home!
i know you guys went home, but have read on more than one occasion the poly trans mount is not bolt and go.......it needs trimmed down i believe or else it puts the tail at a positive angle which we dont want.....many vibration issues from that i believe.....i went with rubber on mine
i know you guys went home, but have read on more than one occasion the poly trans mount is not bolt and go.......it needs trimmed down i believe or else it puts the tail at a positive angle which we dont want.....many vibration issues from that i believe.....i went with rubber on mine
On my 01 I did Spohn solid motor mounts (The mount and pedestal are all one unit) and a Prothane trans mount. I sincerely LOVED that setup. Even with a "rumpity-rump" cam I didn't really notice anything more than just having a better "feel" for the car. BUT... much like exhaust note, NVH is subjective. Some cant stand it, some love it, some don't notice a difference.
Depends on the brand. I've read more horror stories about Energy Suspension's trans mount...
On my 01 I did Spohn solid motor mounts (The mount and pedestal are all one unit) and a Prothane trans mount. I sincerely LOVED that setup. Even with a "rumpity-rump" cam I didn't really notice anything more than just having a better "feel" for the car. BUT... much like exhaust note, NVH is subjective. Some cant stand it, some love it, some don't notice a difference.
On my 01 I did Spohn solid motor mounts (The mount and pedestal are all one unit) and a Prothane trans mount. I sincerely LOVED that setup. Even with a "rumpity-rump" cam I didn't really notice anything more than just having a better "feel" for the car. BUT... much like exhaust note, NVH is subjective. Some cant stand it, some love it, some don't notice a difference.
That's a great setup for feel and for driving. I could stand it if it were a toy, but if it were my daily I would probably hate it. Rattles and squeaks drive me nuts in my "nice" car. In my toy I don't care.
Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
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Thanks for help so far guys! I was finally able to get started last week on the mounts and the headers. I’ve got the drivers side done and what a pain in the *** but really not as bad as I thought it was gonna be. I’m lucky I can just take my time with it. I couldn’t imagine having to have this done ASAP! I took the mount and the pedestal out in one piece. Easy coming out. Going back in oh my god! Finally got engine up high enough to get it back in and then there was the twist of the mount I had to get it lined back up. Definitely took patience on that one. The steering knuckle was a pain to get off and back on but headers slid right in with that off. I’m on the passenger side now with the plugs out and the manifold off and trying to get the mount out. Some where I read the passenger side was easier but I can barely get my hands in there and I’m not a very big guy. So far I haven’t had to jack it up higher then 18” and I think the passenger side might need more because the tubes look longer.
Right now I have new prothane motor mounts with a poly trans mount. It's actually much better than I thought i would be, but am considering going back to a stock trans mount for comparison's sake. Prothane motors mounts were a big thumbs up though.
Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
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This is the set up I’ll be at. Prothane motor mounts and poly trans. Going to back to the rubber trans mount.
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Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
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Man I can’t get the pedestal to line up! I got the poly in and on the engine with the bolt through the pedestal and one bolt started. I need a third hand to get another started while using a punch and long pry bar to move it in place. Any ideas on how to get the pedestal twisted around to line up?
I haven't done the motor mounts YET there coming. A little off topic, wait until you replace the trans master cylinder, FUUUUUUUK going around the brake booster with the line sucked
Man I can’t get the pedestal to line up! I got the poly in and on the engine with the bolt through the pedestal and one bolt started. I need a third hand to get another started while using a punch and long pry bar to move it in place. Any ideas on how to get the pedestal twisted around to line up?
I feel your pain... But it's not as bad as Spohn solids. Gotta line up 8 holes at the same time since the pedestal and mounts are all one unit 
With the engine balanced on a floor jack, I used a 3' piece of 2x4 as a "pry bar" to get it lined up. If this is your first time ever doing it, it seems almost impossible. After this it'll be a cake-walk.
Loosen the pedestal bolts on the engine side as well. It'll need a little slack all the way around so you can slowly get all the bolts started.
With the engine balanced on a floor jack, I used a 3' piece of 2x4 as a "pry bar" to get it lined up. If this is your first time ever doing it, it seems almost impossible. After this it'll be a cake-walk.
Loosen the pedestal bolts on the engine side as well. It'll need a little slack all the way around so you can slowly get all the bolts started.
Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
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Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
Likes: 0
I had to shove a small prybar through the hole near the bottom of my passenger pedestal and twist to get the bolts in. Took some major maneuvering but, they went in. Sucks because a week later I took the mounts out and put new rubbers back in because I believed they were keeping my Y pipe from going on the headers. Nope!
Thread Starter
Teching In
Joined: Mar 2014
Posts: 24
Likes: 0
I feel your pain... But it's not as bad as Spohn solids. Gotta line up 8 holes at the same time since the pedestal and mounts are all one unit
With the engine balanced on a floor jack, I used a 3' piece of 2x4 as a "pry bar" to get it lined up. If this is your first time ever doing it, it seems almost impossible. After this it'll be a cake-walk.
Loosen the pedestal bolts on the engine side as well. It'll need a little slack all the way around so you can slowly get all the bolts started.
With the engine balanced on a floor jack, I used a 3' piece of 2x4 as a "pry bar" to get it lined up. If this is your first time ever doing it, it seems almost impossible. After this it'll be a cake-walk.
Loosen the pedestal bolts on the engine side as well. It'll need a little slack all the way around so you can slowly get all the bolts started.
thanks for all the help guys! I’ll try again Friday when I have more time for it.
I didn't use any. A lot of us repin the PCM so we can use the rear pigtails to read as the fronts.
https://ls1tech.com/forums/generatio...vette-o2s.html
https://ls1tech.com/forums/generatio...vette-o2s.html