88 350 tpi formula

iTrader: (9)

alright I did a search and as it seems most people are using the board sponsors mounts and are having a hard time. I however used the mounting plates and I am having a hard time as well. the oil pan hits and is preventing the rear of the eng. to tilt rearward enough to sit like the eng. normally should. has anyone else used the adapter type of plates? if I move the mounts or make new plates how far back is too far?


where is the ideal location of the eng? no matter what obsticals because if it is where I have mine I will mod. the pan like this.... http://cgi.ebay.com/ebaymotors/1967-...QQcmdZViewItem

if it is back further to keep the driveshaft length and torque arm length I will move it back more

xtremeirocz

I used the spohn mounts on both my car and red92rs's car and i have to say they were pretty tight but did the job, mine is a 86 and seems to give about 3/8 of a inch clearance on red92rs's car it was a little tighter but both still alowed the motor to position correctly

88 350 tpi formula

iTrader: (9)

the best I can tell is this......

the stock mount is centered 16" from the rear of the gen 1,2 block

with these mount plates the factory 82-92 mount is now centered 14.75" from the rear of the ls1 block.

as you can see this means the ls1 sits forward 1.25" from where a "gen 1,2" would sit.

now again to the best of my knowledge the ls1 t56 is 1.5" longer than the ls1 style.

which means the stock drive shaft would currently be off by .25" which should be ok since it looks like everyone else is really going over buy over a full inch maybe more?

so as it looks maybe I should mod. the pan? mod the k-member or join the masses and shove the drive shaft into the trans too far by an inch?

xtremeirocz

I dont know about t-56 clearance in route to the driveshaft, mine is a turbo 350 and i have a 1-1/2 of yoke space and daniels is a 4l60 and has about the same. we used a ls1 driveshaft for his

88 350 tpi formula

iTrader: (9)

I am sure everyone is doing fine with the length I just wonder if it is really correct? I am wondering how I should go about my clearance problem. I could redo the mounts... have the pan cut and welded.... hum.... it is so close though and the coils and valve covers have lots of room on the pass side. I may just redo the mounts to move the eng. back some.


thanks for responding.

ghettocruiser

iTrader: (4)

Mine was SUPER tight. Like so tight I coudl barely get a piece of cardboard between the k-member and oil pan. So I dropped my k-member again and took the grinder to it...which helped alittle.

Ultimatly what I ended up doing is making a spacer for the trans mount. Goes between the trans mount and the crossmember.

I just built a custom crossmember, so the spacer I used this time was 3/16" plate. Im easily able to get a piece of cardboard in there now and I feel much better about it. Im running poly motor mounts and trans mount, so I dont worry about it moving much.

Justin

88 350 tpi formula

iTrader: (9)

I am really thinking about rewelding my pan or grinding the k-member maybe cut the whole edge of it off in that area and place a 1/4" chunk of stock steel in there and weld it shut again

ghettocruiser

iTrader: (4)

If I ever have my k-member out for any reason again, Im going to do just what you described. Im going to cut a chunk out and either weld in a piece of flat steel, or use a piece of angle with the corner facing in.

Thats only if I take the k-member out for something, and I cant imagine needing to do that unless the motor has to come out for some reason.

Justin

88 350 tpi formula

iTrader: (9)

this thing is bugging me... I removed the eng. and I think what I am going to do first is redrill the clam-shell mount holes 1" rearward and rebolt them in. then grind the k-member welds some and see how well it fits. the bolts won't be close to anyother mount holes so I should be fine far as strength goes.

406TPI

iTrader: (1)

I used Spohn mounts and it was tight around the corners of the pan....so I used a little heat from a torch and hammered in the cross memeber a little, now I have about 1/4 inch clearance.

Chicago Z

What motor mounts are you guys talking about? Hope it's not the hawksthirdgen ones as I just ordered a set...

88 350 tpi formula

iTrader: (9)

talking about all of them. the closest ones seem to be the spohn ones which Is what hawks? I think sell as well. the e-bay plates are just no way in any reality close and will be off by inches. I think the spohn ones may? be off too but will be close to 1/4" I will have to measure to say for sure though so it's not anything to make use as a fact until I measure. I did go and get the specific measurments of the gen 1,2 and 3 blocks and trans. ofcourse I can't find my notes now so I will have to post when I find them

ghettocruiser

iTrader: (4)

Before you even bother dropping your motor in, I would advise you to grind/beat on the k-member along that back side. No matter what mounts you get the pan will be close there.

I dont think its really a block position or block dimension issue... its more the fact that the pan is square and bulky. The stock oil pans have slopes and curves and the tighter sump area. That big flat square bottom of the LSx pan just makes things tight.

Justin

GM-LSX

So, how much space between the K-Member and Pan along the Z-Axis?

Since im going to use the C6 LS2 pan, i'm cuting it anyway.

Chicago Z

So I should give the k member a good whack'n with a BFH and make it look like yours? If thats all I need to do it's not a prob. BTW your car kicks *** man! Seeing your posts made me want to do the LS6 swap that I'm just now beggining.

ghettocruiser

iTrader: (4)

Thanks for the compliment...

I actually wouldnt beat on it. But someone else in this thread said they did and it worked. So I guess thats one option. Personally, I would cut that edge out and weld in a piece of angle or even a piece of flat bar at an angle. At the very least grind on it some.

I took the grinder to mine, and I even took a hair off he corners of the oil pan. My clearance issues werent all the way across the sump. Just on the outside corners. I have about 3/16" right now, and so far thats been fine. Im running poly motor and trans mounts too. I chose to make up some of my clearance by putting a small shim under the trans mount.

Im using the older style energy suspension mount that came with the preload plate. So I have the preload plate, plus the mount, plus a 1/8" piece of steel for a spacer. That is what helped me the most. I wasnt about to pull my k-member back out again.

Justin

StngKlr

Heres my mounts that have been on the car for over three years now. I dont know if Spohn has changed some things up as far as fabrication goes, but my guess would be that they havent. As long as the pan dosent hit the K-Member then everything should be alright, no matter what the clearance is.

That modified pan has got to be losing enough space for 1 quart of oil. Its a shame that these "fabricators" cant find a way to compensate for that. Just make it fit I guess lol.

Also, for anyone using a shim on the tranny mount, did you use an angle finder to see how much it changed the pinion angle. Its probably not much, but I'm just curious to see how much it did change it. And if the change is drastic, then the old stock torque arm wont cut it anymore.

And for taking measurements, I would start at the rear-end, sitting at ride height, correct pinion angle, then measure from there. Measurements should be the same from U-Joint to bellhousing edge on both the 3rd and 4th gens. Driveshafts are the same length and the 700R4, 4L60E and T56 are the same length. Heres some good tranny lengths info. http://www.chevyhiperformance.com/te...swapping_tech/

88 350 tpi formula

iTrader: (9)

I did not see any lengths?


anyway the ls1 t56 is around 31" long with bellhousing

the t5 with bell housing is around 31.25"

StngKlr

They are there. You just have to do a little math.

88 350 tpi formula

iTrader: (9)

that's kinda my point. they will tell you is x amount shorter or longer than this trans but no real measurement. so I posted what I got to save the next guy from having to read that artical that goes on and on about stuff you can see in a regular picture

StngKlr

Hmmm... Thats real clear there too.

Just trying to help, I'll go away now.

88 350 tpi formula

iTrader: (9)

Wooooo you caught a typo lt1