How to identify Flowwmasters? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 05-24-2002, 12:17 PM

How can I tell which Flowmasters are on my truck?. I think they might be 50 series. They sound really good, but I have heard louder. I heard 40 series sounded the best. I wouldn't mind a little deeper tone. There were some serial numbers if I recall on the end of them. Would this tell me?

ddsmith · 05-24-2002, 01:25 PM

My flowmaster sheet says that the outside measurements tell the story. If the muffler case is 16" long then it is a 50 series. The 40 series is 13" long both are 4" thick and 9.75" wide. The 30 series is 17" long 10" wide and 5" thick. Hope this helps you out.

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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
79 Chevy 4X4 (Tom's old truck)

70c10 · 05-24-2002, 01:48 PM

ddsmith,
Thanks for the info. I think mine are 40 series. I always heard they were the loudest, but I guess not. Mine sound good enough for now. Thanks again!

Mike C · 05-24-2002, 01:52 PM

Mine have a part number tag on the muffler, but then again, they are 17 years old.

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70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable

[This message has been edited by Mike C (edited May 24, 2002).]

70 Jimmy · 05-24-2002, 03:26 PM

The 40's will sound like a Mustank, the 50 will sound like two hondas! hehehe

69 longhorn · 05-24-2002, 06:22 PM

I took my 40s off.......tooo loud stuck out the sides withe 3" tailpipes. Im goin back to one of my old favorites,DynoMax superturbos........69 longhorn.

CoryM · 05-24-2002, 09:44 PM

Dont forget the whole delta flow thing. my old 50 series flowmasters didnt have it, but my new ones on camaro do. Big difference in sound. I think 40s with delta flow are 14" long, not sure.
CoryM

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1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
http://www.geocities.com/chevroletc1070

"Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high."
Lieutenant Colonel John McCrae, Canadian Army

05-24-2002, 12:17 PM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	How to identify Flowwmasters? How can I tell which Flowmasters are on my truck?. I think they might be 50 series. They sound really good, but I have heard louder. I heard 40 series sounded the best. I wouldn't mind a little deeper tone. There were some serial numbers if I recall on the end of them. Would this tell me? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-24-2002, 01:25 PM	#2
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	My flowmaster sheet says that the outside measurements tell the story. If the muffler case is 16" long then it is a 50 series. The 40 series is 13" long both are 4" thick and 9.75" wide. The 30 series is 17" long 10" wide and 5" thick. Hope this helps you out. ------------------ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 79 Chevy 4X4 (Tom's old truck) __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

05-24-2002, 01:48 PM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	ddsmith, Thanks for the info. I think mine are 40 series. I always heard they were the loudest, but I guess not. Mine sound good enough for now. Thanks again! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

05-24-2002, 01:52 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Mine have a part number tag on the muffler, but then again, they are 17 years old. ------------------ 70 GMC 3/4 ton Sierra Grande 402/TH400 72 Jimmy 4WD 4spd 4" & 35's 64 Corvette Coupe 68 Camaro 'vert TPI & TH700 69 Z/28 355 12.6's @110 72 Datsun 240Z-ol' reliable [This message has been edited by Mike C (edited May 24, 2002).] __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

05-24-2002, 03:26 PM	#5
70 Jimmy aka Crusher, Crushergmc Join Date: Mar 2000 Location: Oregon Posts: 1,834	The 40's will sound like a Mustank, the 50 will sound like two hondas! hehehe __________________ "KEEP IT DOWN!" 70 Jimmy 454 2wd 56 GMC Big Window "It's funny till someone gets hurt, then it's freakin' hilarious"

05-24-2002, 06:22 PM	#6
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	I took my 40s off.......tooo loud stuck out the sides withe 3" tailpipes. Im goin back to one of my old favorites,DynoMax superturbos........69 longhorn. __________________ http://community.webshots.com/user/hotrodhorn

05-24-2002, 09:44 PM	#7
CoryM Registered User Join Date: Dec 1999 Location: Surrey, B.C. , Canada Posts: 874	Dont forget the whole delta flow thing. my old 50 series flowmasters didnt have it, but my new ones on camaro do. Big difference in sound. I think 40s with delta flow are 14" long, not sure. CoryM ------------------ 1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada http://www.geocities.com/chevroletc1070 "Take up our quarrel with the foe: To you from failing hands we throw The torch; be yours to hold it high." Lieutenant Colonel John McCrae, Canadian Army __________________ 1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada http://www.geocities.com/chevroletc1070 "Take up our quarrel with the foe: To you from failing hands we throw The torch; be yours to hold it high." Lieutenant Colonel John McCrae, Canadian Army



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