1987 2wd 350 headers help?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RSTYCVY · 04-03-2005, 11:20 AM

I just put a set of headers on a 87 gmc r1500 2wd 350/m20. The problem I am having is the driverside collector is pointing right at the tranny crossmember

. The original exhaust was driverside only and went up over the crossmember . If I was to cut and weld the collector it wouldn't be enough to get me over the xmember. I can't get a pipe on it to go under it either. Has anyone else had this problem on an 87??

twoodson · 04-03-2005, 03:31 PM

What type headers are you using? Shorties or full length. I have the Edelbrock shorties w/ AIR injection on mine and the only thing that I had to do was to have a smaller size pipe installed because the headerflang was a little smaller than the original manifold flang.

RSTYCVY · 04-03-2005, 07:42 PM

Flow tech full length. I removed the air inj. pipes and pump.

gchemist · 04-03-2005, 08:33 PM

What you need is a dual hump crossmember from a 1 ton truck. Or build your own. A board member made this crossmember for my truck. A dual hump crossmember is almost the same design but stock. Some board members have the dual hump crossmember too.

piecesparts · 04-03-2005, 09:46 PM

A good muffler guy can get around the cross member. I have headers on my son's truck (86 Chevy and my truck 84 GMC and with both of them we just angled that side a little to clear the member and then completed the pipimg run. Both trucks are lowered 31/2" and there are no clearance problems.

RSTYCVY · 04-04-2005, 04:26 PM

Quote:

Originally Posted by piecesparts

A good muffler guy can get around the cross member. I have headers on my son's truck (86 Chevy and my truck 84 GMC and with both of them we just angled that side a little to clear the member and then completed the pipimg run. Both trucks are lowered 31/2" and there are no clearance problems.

Did you go over or under the xmember?

SanitysBane · 04-03-2005, 10:24 PM

We just welded two 3inch turn downs together to make a kick up, it was cheap and it works. No real point in making a custom crossmemeber unless you want to.

bluejimmy76 · 04-04-2005, 04:11 AM

I had the same problem with my 76 stepside. The passenger side was the bigger problem. I had a buddy who does exhaust cut the collector flange back about 3 inches and used U-bends to go under the x-member and connect to my existing new 2/1/2" exhaust. The head pipes hang lower than the headers, maybe if I change to a dual hump x-member I can get the pipes up higher.

04-03-2005, 11:20 AM	#1
RSTYCVY SurlySpeedDemon Join Date: Feb 2005 Location: New Hampshire Posts: 60	1987 2wd 350 headers help?! I just put a set of headers on a 87 gmc r1500 2wd 350/m20. The problem I am having is the driverside collector is pointing right at the tranny crossmember . The original exhaust was driverside only and went up over the crossmember . If I was to cut and weld the collector it wouldn't be enough to get me over the xmember. I can't get a pipe on it to go under it either. Has anyone else had this problem on an 87??

04-03-2005, 08:33 PM	#4
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	What you need is a dual hump crossmember from a 1 ton truck. Or build your own. A board member made this crossmember for my truck. A dual hump crossmember is almost the same design but stock. Some board members have the dual hump crossmember too. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

04-03-2005, 10:24 PM	#7
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	We just welded two 3inch turn downs together to make a kick up, it was cheap and it works. No real point in making a custom crossmemeber unless you want to. __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

04-04-2005, 04:11 AM	#8
bluejimmy76 Registered User Join Date: Dec 2004 Location: Nor Cal inda 408/916 Posts: 31	I had the same problem with my 76 stepside. The passenger side was the bigger problem. I had a buddy who does exhaust cut the collector flange back about 3 inches and used U-bends to go under the x-member and connect to my existing new 2/1/2" exhaust. The head pipes hang lower than the headers, maybe if I change to a dual hump x-member I can get the pipes up higher. __________________ My 1st 76 sierra classic stepside Owned: 76 chevy suburban 85 chevy K1500 90 chevy C1500 90 chevy K1500 sub 97 chevy C3500 crewcab dually 2000 chevy C3500 crewcab dually

04-03-2005, 03:31 PM	#2
twoodson Registered User Join Date: Jul 2003 Location: Lancaster, TX Posts: 291	What type headers are you using? Shorties or full length. I have the Edelbrock shorties w/ AIR injection on mine and the only thing that I had to do was to have a smaller size pipe installed because the headerflang was a little smaller than the original manifold flang.

04-03-2005, 07:42 PM	#3
RSTYCVY SurlySpeedDemon Join Date: Feb 2005 Location: New Hampshire Posts: 60	Flow tech full length. I removed the air inj. pipes and pump.

04-03-2005, 09:46 PM	#5
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	A good muffler guy can get around the cross member. I have headers on my son's truck (86 Chevy and my truck 84 GMC and with both of them we just angled that side a little to clear the member and then completed the pipimg run. Both trucks are lowered 31/2" and there are no clearance problems.



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