Exhaust recommendations? 305 K10

[cam-camaro]

New rebuilt motor, don't care much for the stock exhaust I have on there. It's a chevy 305 with a 3/4 cam, .40 over bored sitting in a 86 K10 .Money isn't too much of an issue, but I'd like to keep it under $400. So what's the best set-up for a combination of sound/performance? I appreciate any advice. Thanks in advance.

[Pyrotechnic]

"Well, I got a 426 Hemi in her. Three-quarter cams, nitro boosters. I can get 'er up to 155. Never do though, of course, unless I'm chasing a cute chick in a Ferrari! Hahahahahahaha!"

On a more serious note, a dual setup with flowmasters or magnaflows, depending which sound you like. An X pipe is the latest fashion these days but it adds some to the cost and I don't know how hard/easy that is to do on a 4x4.

[cam-camaro]

Sweet car dude, I like it, good luck with Ferrari chase haha. If you end not catching her, there's always room for a beer at the local joint.


What size pipes would you recommend? Right now they have 1 1/2 or 1 3/4, not sure but whatever they are they sound terrible. You can hear the truck from a half a mile away, even in a low gear going slow.

[Pyrotechnic]

For a warmed up 305, 2.25 pipe should be fine. If you are planning an engine upgrade later, you can go with 2.5 though it's a bit overkill for what you have now.

[cam-camaro]

I appreciate the advice. By "overkill", do you mean it's more than I'll need, or will it have a negative effect on my exhaust flow.

I doubt I'll do an engine upgrade, I just re-built this motor from top to bottom, I plan on getting many many miles outta her.

[Pyrotechnic]

The idea is to keep the exhaust velocity up to help low end torque, the 2.5 pipe won't help with that and it will cost more. 2.25 is good choice if that engine is permanent.

[cam-camaro]

Thanks, 2.25 it is then. What about headers? I have stock exhaust manifolds, they aren't in too good shape but it's all I had at the time. I plan on replacing them, not sure if I"m going to go with more manifolds or headers.

[motornut]

i went 2.25 ,true duals,from almost stock manifolds,to flowmasters 40s,one with H pipe,out before rear wheels
other one walker pipes ,cherry bombs,no H out the back sides
love em both
you can buy duals/kits from walker

[motornut]

Originally Posted by cam-camaro

Thanks, 2.25 it is then. What about headers? I have stock exhaust manifolds, they aren't in too good shape but it's all I had at the time. I plan on replacing them, not sure if I"m going to go with more manifolds or headers.

to you have to test/smog it?

[cam-camaro]

Originally Posted by motornut

to you have to test/smog it?

Nope, pretty rural county.

[motornut]

Originally Posted by cam-camaro

Nope, pretty rural county.

Well the manifolds seem less work,headers can leak more
Take out what smog stuff you can
Heat riser?cat?
Some think my 305 is souped 350 lol now
Have a look at my 79 below I did exhaust this summer
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[INSIDIOUS '86]

Dyno max has a dual system for our trucks for about 132 dolla. What kind of sound you looking for? Quiet cruze? Kill your neighbors or wake up the dead?
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[OutlawDrifter]

get on youtube and find a sound you like.

exhaust is generally my favorite part of a project. i've had everything from quiet to pissing off the neighbors 4 miles from home. flowmasters drone in the cab, but i'm past the loud because its loud stage. i had spintech sportsmans on my el camino, they were ok, i really liked the sound on those. i'm a big fan of hooker aerochambers. loud when you need them to be, and mellow when you're cruising.

it's all about preference, and what you can stand for noise level in the cab. i run a hooker aerochamber on my lsx swapped camaro, but it also has a cutout in the i-pipe when i need to announce my presence.

[kalbert]

Originally Posted by INSIDIOUS '86

Dyno max has a dual system for our trucks for about 132 dolla. What kind of sound you looking for? Quiet cruze? Kill your neighbors or wake up the dead?
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I've got one of the Dynomax DIY kits with the cheapo Super Turbo mufflers. They were pretty quiet at first but after the packing gets settled they have a great tone. Noisy when you get into it, quiet when you're cruising. Not loud loud, but a good sound. It's lasted going on 12 years, starting to get a little thin around the clamps. Mufflers are also starting to come apart at the seams but by and large I've been very happy with it. Had I mounted the mufflers with the drain holes down they'd probably last longer...

[kalbert]

Originally Posted by cam-camaro

...It's a chevy 305 with a 3/4 cam...

Originally Posted by Pyrotechnic

"Well, I got a 426 Hemi in her. Three-quarter cams, nitro boosters. I can get 'er up to 155. Never do though, of course, unless I'm chasing a cute chick in a Ferrari! Hahahahahahaha!"

Was that Black Sheep or Tommy Boy? And what the heck is a 3/4 cam anyway

[Pyrotechnic]

Originally Posted by kalbert

Was that Black Sheep or Tommy Boy? And what the heck is a 3/4 cam anyway

Black Sheep lol. I was waiting for someone to get the reference. I can't help but think of that movie everytime someone says 3/4 cam.

[Squareforceone]

Got any pictures of the truck?

[cam-camaro]

Heres a picture of the truck. By the way, I want to refrain from starting a new thread so hopefully you guys can help me. There is slight knocking/ticking sound coming from the engine bay and underneath the truck. I highly doubt it's a rod bearing( I replaced them ). The truck is a 1986 K10 305.

I'm thinking it may be a knock sensor( I don't know if this truck is suppose to have one or not)

Valve leash( I set it before I started the motor after the rebuilt, and it doesn't sound like a lifter, but then again, I'm an amateur).

Or possibly a loose bolt on the flywheel or flexplate.

Any ideas on how to diagnose this sound?

[motornut]

Originally Posted by cam-camaro

Heres a picture of the truck. By the way, I want to refrain from starting a new thread so hopefully you guys can help me. There is slight knocking/ticking sound coming from the engine bay and underneath the truck. I highly doubt it's a rod bearing( I replaced them ). The truck is a 1986 K10 305.

I'm thinking it may be a knock sensor( I don't know if this truck is suppose to have one or not)

Valve leash( I set it before I started the motor after the rebuilt, and it doesn't sound like a lifter, but then again, I'm an amateur).

Or possibly a loose bolt on the flywheel or flexplate.

Any ideas on how to diagnose this sound?

check your manifold doughnuts,see if they are loose or falling apart

[cam-camaro]

Originally Posted by motornut

check your manifold doughnuts,see if they are loose or falling apart

If that will make a ticking sound then I'm pretty sure that's my problem. Each side of the exhaust/manifold hook up is missing a bolt because the stud on the manifold broke off.

[motornut]

Originally Posted by cam-camaro

If that will make a ticking sound then I'm pretty sure that's my problem. Each side of the exhaust/manifold hook up is missing a bolt because the stud on the manifold broke off.

rust/heat is a pain for those
look into brass nuts, two each stud
no rust one locks the other

[motornut]

Originally Posted by cam-camaro

If that will make a ticking sound then I'm pretty sure that's my problem. Each side of the exhaust/manifold hook up is missing a bolt because the stud on the manifold broke off.

rust/heat is a pain for those
gona have to fix that tho
look into brass nuts, two each stud
no rust one locks the other

[cam-camaro]

Thanks I appreciate the advice! I'll be sure to do that. On another note, do you happen to know where the vacumn hose for the 4x4 hubs goes? It's automatic hubs so I know they run off a vacumn, I'm just not sure where. The 4x4 differentials work, the hubs just won't lock. I'm 90% sure it's a vacumn hose I left off when I rebuilt the motor I just don't know where.

[motornut]

Originally Posted by cam-camaro

Thanks I appreciate the advice! I'll be sure to do that. On another note, do you happen to know where the vacumn hose for the 4x4 hubs goes? It's automatic hubs so I know they run off a vacumn, I'm just not sure where. The 4x4 differentials work, the hubs just won't lock. I'm 90% sure it's a vacumn hose I left off when I rebuilt the motor I just don't know where.

vac line would be from the manifold ,usally behind the carb, to the tranny only
no vacuum needed for 4X4
auto hubs just engage
manuals have a twist dial
and full time has a solid plug

[cam-camaro]

Originally Posted by motornut

vac line would be from the manifold ,usally behind the carb, to the tranny only
no vacuum needed for 4X4
auto hubs just engage
manuals have a twist dial
and full time has a solid plug

I thought they ran off a vacumn, possibly to the canister in the engine compartment. There is a line( VAC I'm assuming) that runs from the front differential to right above the canister, but it plugged off ( and always has been, even when the 4x4 previously worked). Maybe I'm missing a wire connection somewhere for the Auto-hubs. Any Ideas? The 4x4 worked before I rebuilt the motor, so I'm sure something is unplugged somewhere. The truck will still pull through the differential the hubs just won't lock.