Muffler gets tossed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

apstguy · 04-23-2003, 12:00 AM

Today I decided I no longer liked my crappy muffler that had a hole in it, so my friend and I cut it off.

My 'lil 305 bark is now much worse than its bite! At idle & high RPM it sounds sweet, but inbetween, it sounds like a friggen tractor

I'm getting a new muffler and keeping my old tips. they are just taking a break & are getting polished. Anyone else running without a muffler? Mine isn't loud enough to break any laws - must be the cat. plugging it up. I did gain some horsepower though!!!

TIMSPEED · 04-23-2003, 02:12 AM

Wanna buy a 3" in/out flowmaster? I have it on my truck now, and it's LOUD!

apstguy · 04-23-2003, 02:18 AM

Nah, but thanks. I want to get an Aeroflow. Does anyone have a spare set of 350 heads I could have or buy? It would make this 305 have a little more power.

Oh yeah - my uncle told me to open the plug on the cat. and drain out all the pebbles. Anyone done this? Will this pass smog as long as my motor is in good shape?

Mike76251 · 04-23-2003, 02:31 AM

Wouldn't 350 heads lower your compression too much?
I think the 305 heads have a 58cc chamber and most 350 heads have a 76cc chamber.

apstguy · 04-23-2003, 02:51 AM

Not sure, but 305 valves are small and 350 heads would allow it to breath easier making more horsepower. Not to mention a better sounding rumble!

Mike76251 · 04-23-2003, 02:59 AM

Another thing I remembered...
I have heard from some people that 350 heads have a wider chamber and if you put them on a 3.74" block the valves may hit the top edge of the bore.

*1FaastC10* · 04-23-2003, 11:32 AM

Tyler, just drop a 350 in it already!

78' Silverado · 04-23-2003, 03:26 PM

Lucky for me I got no cats haha. Anyways....Why don't u like Flowmasters.

79BIG10 · 04-23-2003, 07:46 PM

Quote:

Originally posted by 78' Silverado
Lucky for me I got no cats haha. Anyways....Why don't u like Flowmasters.

I've got Flowmasters now and so want to get rid of them for the Aerochambers. I've heard them in person and there's so much more difference in quality of sound, cheaper and flow so much better. If I had someone buy my Flowmasters off me I'd buy a set of Aerochamers ASAP. Flowmasters sounded good when they first came out but now they are not the best thing out there. Do a check on Ebay and see how many Flowmasters used are being sold there compared to Aerochambers.

low 84 · 04-23-2003, 08:53 PM

Quote:

Originally posted by Mike76251
Wouldn't 350 heads lower your compression too much?
I think the 305 heads have a 58cc chamber and most 350 heads have a 76cc chamber.

i definatly agree on this one. if you swaped them out for smog 350 heads your compression is gonna be so incredibly low, i don't care how big the valves are thats gonna run ten times worse than with your stock 305 heads.

apstguy · 04-23-2003, 09:41 PM

Damn. I thought I heard of someone doing it, but I guess not. Grrrr!

Quote:

Originally posted by low 84

i definatly agree on this one. if you swaped them out for smog 350 heads your compression is gonna be so incredibly low, i don't care how big the valves are thats gonna run ten times worse than with your stock 305 heads.

86SILVERADO · 04-23-2003, 09:47 PM

It is common for street rodder types (just not in that bracket myself) to put 305 heads on a 350 to up the compression but not the other way around.

popdad · 04-23-2003, 09:50 PM

i drained the bbs out of a cat before and a motor soft plug will go back in the hole not sure about the smog diff thou i did it to a olds in ohio and never got in trouble it did make a diff and more power on its motor which was a 307 good luck popdad

apstguy · 04-23-2003, 10:09 PM

thanks popdad. I wanted SOMEONE to answer my question. I guess I'll do that and keep the pebbles just in case.

Mike76251 · 04-23-2003, 10:50 PM

I did not answer that part because you live in the People's Republic of Kalifornia.
Draining the catalyst will cause you to fail that state's inspection.
The sniffer that goes up your truck's pipe will show that quick like.

Quote:

Originally posted by apstguy
thanks popdad. I wanted SOMEONE to answer my question. I guess I'll do that and keep the pebbles just in case.

apstguy · 04-23-2003, 11:00 PM

Depends if I get the right person to test it.

84Stepper · 04-23-2003, 11:16 PM

Man Cali must suck for custom cars!

apstguy · 04-23-2003, 11:36 PM

DON'T get me started . . . . . . . . ::grumble::

low 84 · 04-24-2003, 04:09 AM

Quote:

Originally posted by apstguy
Depends if I get the right person to test it.

if you can get someone to hook you up on the inspection then your better off just removing the whole cat.

04-23-2003, 12:00 AM	#1
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Muffler gets tossed Today I decided I no longer liked my crappy muffler that had a hole in it, so my friend and I cut it off. My 'lil 305 bark is now much worse than its bite! At idle & high RPM it sounds sweet, but inbetween, it sounds like a friggen tractor I'm getting a new muffler and keeping my old tips. they are just taking a break & are getting polished. Anyone else running without a muffler? Mine isn't loud enough to break any laws - must be the cat. plugging it up. I did gain some horsepower though!!! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

04-23-2003, 02:12 AM	#2
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	Wanna buy a 3" in/out flowmaster? I have it on my truck now, and it's LOUD! __________________ I have a few cars... See Them Here

04-23-2003, 02:18 AM	#3
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Nah, but thanks. I want to get an Aeroflow. Does anyone have a spare set of 350 heads I could have or buy? It would make this 305 have a little more power. Oh yeah - my uncle told me to open the plug on the cat. and drain out all the pebbles. Anyone done this? Will this pass smog as long as my motor is in good shape? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

04-23-2003, 02:51 AM	#5
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Not sure, but 305 valves are small and 350 heads would allow it to breath easier making more horsepower. Not to mention a better sounding rumble! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

04-23-2003, 03:26 PM	#8
78' Silverado \/ My Loves \/ Join Date: Mar 2003 Location: Midland,Texas Posts: 462	Lucky for me I got no cats haha. Anyways....Why don't u like Flowmasters. __________________ 78' Silverado - Blue - (In a Coma) 04' Silverado -Red- 383 Stroker in progress for the 78'!!!

04-23-2003, 02:31 AM	#4
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	Wouldn't 350 heads lower your compression too much? I think the 305 heads have a 58cc chamber and most 350 heads have a 76cc chamber.

04-23-2003, 02:59 AM	#6
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	Another thing I remembered... I have heard from some people that 350 heads have a wider chamber and if you put them on a 3.74" block the valves may hit the top edge of the bore.

04-23-2003, 11:32 AM	#7
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	Tyler, just drop a 350 in it already!

04-23-2003, 09:47 PM	#12
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	It is common for street rodder types (just not in that bracket myself) to put 305 heads on a 350 to up the compression but not the other way around.

04-23-2003, 09:50 PM	#13
popdad Registered User Join Date: Mar 2003 Location: manderson wyoming Posts: 20	i drained the bbs out of a cat before and a motor soft plug will go back in the hole not sure about the smog diff thou i did it to a olds in ohio and never got in trouble it did make a diff and more power on its motor which was a 307 good luck popdad

04-23-2003, 10:09 PM	#14
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	thanks popdad. I wanted SOMEONE to answer my question. I guess I'll do that and keep the pebbles just in case. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

04-23-2003, 11:00 PM	#16
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Depends if I get the right person to test it. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

04-23-2003, 11:16 PM	#17
84Stepper Registered User Join Date: Feb 2003 Location: Edmond, Oklahoma Posts: 425	Man Cali must suck for custom cars! __________________ 84 Chevy Stepside, 350, TH350, 268h Comp cam, Hooker headers, MSD Pro Billet, Edelbrock Performer manifold and 1604 carb, 40 Series Flowmasters dumped, and Western Chassis 3/5 drop w/ c notch. New 3:73 Eaton Posi

04-23-2003, 11:36 PM	#18
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	DON'T get me started . . . . . . . . ::grumble:: __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

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