Cascade Crew

[Danked]

Are the engine mounts for a 305 and 350 the same? I know my year camaro came optional with a 305, so if they are not interchangable then i might not be swapping in the 350. Thanks.

[Xophertony]

short answer:
YES


long fun answer:

the 350 CID was available in the 3rd gen from 1987 to 1992, so a 350 was also available in your year.

HUGE post about this on TGOs engine swap board. the only mod you have to do to mount the block in your fbody is move a break line. (you can literally bend it into it's new location, or get some line from Napa and make your own). now to actualy get it running you will have to do alot of other stuff, but to mount it that is all you need.

but it breaks down like this. you know how a 2.8 3.1 and 3.4 are all the same block on the outside, and the only difference is the bore and stroke? Small Block Chevys (SBC) are just like that. a 305 is an SBC and uses the same mounts as any other SBC. anything from a 262 to a 400 block will drop in.

there have been 10 different GM production displacements (262, 265, 267, 289, 302, 305, 307, 327, 350, 400), with differnt bores and strokes, and different internal casting. all are basically the same on the outside, which means that a post 86 350 will drop right in to a 1955 originaly equiped with a 265. provided the post 86 accessories will fit in the engine bay of course, but the block will.

for more information on the longest running engine design, you can visit these websites: http://www.aa1car.com/library/2005/us70512.htm
http://www.circletrack.com/thehistoryof/58038/index.html
http://www.chevyhiperformance.com/thehistoryof/0605ch_small_block_chevy_history/
or visit your local library

[aaron_sK]

Wait... I'm confused a bit here....

[Quasi-Traction]

here's what will NEED to be changed on your car for a 350:

1) Motor mounts.......you can use the lower half of the "clamshell", but the part that attches to jounce bumper to the upper that bolts into the block will need to be changed. I think the upper portion is fairly universal on Small block Chevys.

2) Radiator: If your upper hose connection is on the drivers side and lower connection on the pass, you can use it. Otherwise, find a V8 radiator. If you want to keep your air conditioning, you'll probalby want a 3 core (V8) radiator anyways. ) I'm assuming your 350 will be a V belt. You probably won't be keeping the Air contitioning since it will be grooved for a serp belt.

3) ECM: This can either be thrown away (since I'm assuming your going non-emission and carburated) Be careful when pulling apart stuff.....get a wiring diagram and only pull what's attached to the ECM harness. I've only done it on factory carbed cars (carbed 2.8L and carbed 305) so I dunno how integrated the emission/induction controls are with the wires to other important things (like igntion coil, temp sensor, oil presure sensor..etc)

4) Your fuel lines will be on the drivers side. If you keep a mechanical fuel on that 350, you'll have to route them to the other side of the car somehow.

5) Brake lines: your motor mounts will change postion from the rear-most holes on the crossmember to the front most. Unfortunately your brake line runs right where your motor mount needs to go, so you'll have to either re-bend it, or replace it.

6) The fuel pressure will need to be lowered since your going to a carbed V8 from a Fuel injected V6. You can eliminate the in-tank pump. That's probably your best route if you stick with a mechanical fuel pump on motor. if you don't feel like dropping the tank and taking the in-tank pump out, you'll have to get a fuel pressure regulator.

7) unless you're converting to manual steering, be sure to get the pressure and return lines off a V8 power steering pump. You might do well just to get a a whole pump with all the bracketry to mount it, since the V6 will mount differently than a v8 pump will.

8) Your stock suspension will work, but don't hit bumps hard.....you'll be kissing pavement and bottoming out regularly.


I'm sure there's something else I haven't thought of that someone else will chime in with.

[82camaro383]

I had problems with the suspension when i dropped my 90* v6 w/ a th350 into my 82. I couldn't have any people sit in the back because the driveline hit my safety loop everytime i hit a bump. I noticed that v6 motor mounts are taller and more narrow than v8 mounts. I'm not sure if that makes any difference.

[aaron_sK]

Aren't V6 springs shorter in front to compensate for the lighter engine? I remember reading a post on TGO about someone trying to save cash by using them to lower a car.

[Danked]

yeah ive heard the v6 springs are shorter also, so im going to have to check that out. i dont want a th350 tranny i need to get a v8 700r4 i like the OD is this going to be an easy swap, or after i pull my engine am i going to regret doing it and im going to run into a bunch of pot holes and be stuck and shizzle? also, my year came with 4 engine options? funny cause at autozone they ask "do you have a 305 or a 189 v6" they dont ask 350 or 2.8 or whatever..

[Nathan J]

v6 springs with a v8 didnt really seem to change the ride height at all on my car, it sucks it looks like a 4x4 lol ill take some pics and show you, it has 14in rims on it now, tires are a little taller then the 15s t/a wheels and tires that were on it but only like a 1/4 in.
Nathan

[aaron_sK]

*checks TGO*

Yay.... I was right! TPI 350, TPI 305, TBI 305, and MPFI V6.

Dunno.... but since your asking autozone people....

[chevymad]

[Quasi-Traction]

Don't forget that 265's don't have an oil filter pad machined nto the block........(I think this changed in 1956..but I'm not sure)

Also 283's (maybe some 327's?) that went in 62-67 Chevy II's (nova's) had a special block with a recessed oil filter pad so it would clear the K member.

[Xophertony]

all the crap i read never mentioned that....

[Danked]

haha tony autozone ppl. im just saying what they said. my dad wasnt sure if the 305 engine mounting bolts were in the same position as the 350. so i guess the only problem right now is buying this truck, and pulling the engine. but i just wanted to make sure before i put myself in this position. thanks guy, i appreciate it, i couldnt think of anyone else to ask who would know any better.

[Xophertony]

[Danked]

[Xophertony]

[Danked]

haha oops i thought u did

[Xophertony]

ok.... that was weirding me out.

[Danked]

ok tony i have a confession..... im obsessed with you. THERE i said it. happy?

[aaron_sK]

I think we all knew that already.....