351W guys..what exhaust???

LX XLR8R · 09-17-2001, 02:10 PM

MAC makes a total 3" exhaust for a 351..is 3" 2 big???the MAC headers come to a 3" collector..all thier others are 2 1/2"..it wont bolt up to my full mac exhaust i have now will it??..also i am running a c-4..does a c-4 sit wider than my tremec so that i would need special 351 headers???

my mods to motor will be a comp cams 282 grind(.565/.574), afr 185 heads, victor JR intake and a 750 demon carb ..i was looking to run about 10.5:1-11.5:1 compression

------------------
1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch

6T9PONY · 09-17-2001, 08:18 PM

You need at least 1 5/8" primaries on your headers with 3" collectors. After that, I'd say 3" would be the way to go. If you want to go smaller, I'd say 2 1/2" is the limit. So either one of those, 2 1/2" or 3". Should work great.

------------------
Previously "BennyBoy"
'69 Coupe with 351W-I rolled it 8/8
Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Hedman headers, 2 1/2" pipe, glasspacks, C4: shift kit, 9" Currie: Trac-Lok 3.70s, 290hp-stock heads

macx · 09-18-2001, 12:08 AM

either www.magnaflow.com or www.dynomax.com has a chart for engine size and horsepower and what size single or dual exhaust you should run for that size and power.

09-17-2001, 02:10 PM	#1
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	351W guys..what exhaust??? MAC makes a total 3" exhaust for a 351..is 3" 2 big???the MAC headers come to a 3" collector..all thier others are 2 1/2"..it wont bolt up to my full mac exhaust i have now will it??..also i am running a c-4..does a c-4 sit wider than my tremec so that i would need special 351 headers??? my mods to motor will be a comp cams 282 grind(.565/.574), afr 185 heads, victor JR intake and a 750 demon carb ..i was looking to run about 10.5:1-11.5:1 compression ------------------ 1987 black notch(ex 4 banger) DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one.. AIM=onesillynotch

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09-17-2001, 08:18 PM	#2
6T9PONY All about the Windsor. Join Date: Feb 2000 Posts: 2,052	You need at least 1 5/8" primaries on your headers with 3" collectors. After that, I'd say 3" would be the way to go. If you want to go smaller, I'd say 2 1/2" is the limit. So either one of those, 2 1/2" or 3". Should work great. ------------------ Previously "BennyBoy" '69 Coupe with 351W-I rolled it 8/8 Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Hedman headers, 2 1/2" pipe, glasspacks, C4: shift kit, 9" Currie: Trac-Lok 3.70s, 290hp-stock heads

09-18-2001, 12:08 AM	#3
macx Registered Member Join Date: Oct 1999 Location: Gordonville MO USA Posts: 448	either www.magnaflow.com or www.dynomax.com has a chart for engine size and horsepower and what size single or dual exhaust you should run for that size and power.