buyer beware on Jegs headers !!!
- Thread starter 87BlazeLS
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350/th350 is not the problem. Seeing how with any sbc/ trans combo the motor mount location is the same. Only difference is how trans mounts up. Thats the reason for different trans crossmembers. Imo ot sounds as if your motor mounts are sitting in the wrong mounting position and its making your motor sit to far towards the firewall and thats the reason for #7 tube hitting the linkage. There is normally plenty of room there. I run sbc/th350 in all my gbody cars and never a problem except on my first v6 to v8 swap back when i didnt know what i was doing. Lol and had the exact issues.Kwik_Cutty88 said:
Car was a 305 v8 w/ 200R4 all the original mounting points on the block are the same. And the 200R4 stock cross member
does not match the one needed for the TH 350. Mine is a 9" tail. The transmission mount location was about 4 " off.
When I got the cross member for the TH 350 everything bolted right up.
The way these headers fit in the location they are now it would be impossible to move the motor forward even 1" as it would hit
in other areas of the frame. Right now when you go under and look they are positioned in the best possible location around everything else. Just that rear #7 sticking out about 2" further for no reason.
Motor mounts are factory oem for the ones used in the 305 only 3 bolt holes existed in the block or mount.
They are centered front to back of the mounting holes. Are you saying there is an offset pair for this ?
If so what is this part number or link to what it looks like.
thanks
jake
does not match the one needed for the TH 350. Mine is a 9" tail. The transmission mount location was about 4 " off.
When I got the cross member for the TH 350 everything bolted right up.
The way these headers fit in the location they are now it would be impossible to move the motor forward even 1" as it would hit
in other areas of the frame. Right now when you go under and look they are positioned in the best possible location around everything else. Just that rear #7 sticking out about 2" further for no reason.
Motor mounts are factory oem for the ones used in the 305 only 3 bolt holes existed in the block or mount.
They are centered front to back of the mounting holes. Are you saying there is an offset pair for this ?
If so what is this part number or link to what it looks like.
thanks
jake
87BlazeLS said:
No offset that I know of. Was just making a suggestion as far as motor mount location. Like I said different trans members for different trans. The 200r4 doesnt work as you have found. The metric th200/350 would have worked with the th350. Anyway. I personally think hedman headers suck i just bought a set of shorties for my t10 swap with angle plug heads well what do you know hit the frame so bad they are now in the scrap bin. So if jegs are made by hedman as stated. You are right JUNk.
I actually did find a company that sells several sizes of offset motor mounts for SBC chevy's. In 1/2" forward, 1" 2" 3 -3/8"
Not sure exactly how they attach. It looks like the transmission mount has to be extended and welded with a plate to make
that work.
To tell you the gods honest truth the only real big issue I see on this set of headers was the interference with the shift linkage.
And seriously, Cyl 1,3,5 were dead even in length at the first radius, Then number 7 stuck out like a hard on for no damn reason what so ever. Clearly the bender or maker of these could have made the set with this pipe in line with the front 3.
Even the passenger side #8 was stuck out too. Luckily it hits nothing on that side but air.
why they were made in this method of madness is beyond me. This brings up a good point.
I have done several builds and find the exhaust system to be the most difficult and time consuming to deal with.
Dealing with cat backs and such like from Gibson, etc. are fairly plug and play. and are engineered really good.
Many repair shops and exhaust, muffler shops will not work on cars that (should) have a cat in place....
when it does not - they want to call you on the phone to break the bad news , or call you out from the waiting area
to tell you they cannot work on your car unless they install it with the work.
You know as well as I do - "We don't need know stinking cat converter on our cars" when working with swapped motors,
headers, H pipes, x pipes, flow masters, etc. the last thing you want is to muck it up with a big hot tin can hanging
under the car on both sides if you run duals. Nearly impossible.
I just wish someone out there really worked with the stuff they build (weld) and make sure the design is correct.
I think many of us would pay a little more for that to be the norm.
87BlazeLS
She does have a rather purty pooper !
Not sure exactly how they attach. It looks like the transmission mount has to be extended and welded with a plate to make
that work.
To tell you the gods honest truth the only real big issue I see on this set of headers was the interference with the shift linkage.
And seriously, Cyl 1,3,5 were dead even in length at the first radius, Then number 7 stuck out like a hard on for no damn reason what so ever. Clearly the bender or maker of these could have made the set with this pipe in line with the front 3.
Even the passenger side #8 was stuck out too. Luckily it hits nothing on that side but air.
why they were made in this method of madness is beyond me. This brings up a good point.
I have done several builds and find the exhaust system to be the most difficult and time consuming to deal with.
Dealing with cat backs and such like from Gibson, etc. are fairly plug and play. and are engineered really good.
Many repair shops and exhaust, muffler shops will not work on cars that (should) have a cat in place....
when it does not - they want to call you on the phone to break the bad news , or call you out from the waiting area
to tell you they cannot work on your car unless they install it with the work.
You know as well as I do - "We don't need know stinking cat converter on our cars" when working with swapped motors,
headers, H pipes, x pipes, flow masters, etc. the last thing you want is to muck it up with a big hot tin can hanging
under the car on both sides if you run duals. Nearly impossible.
I just wish someone out there really worked with the stuff they build (weld) and make sure the design is correct.
I think many of us would pay a little more for that to be the norm.
87BlazeLS
She does have a rather purty pooper !
I have a 87 grand prix floor console car,i bought the ceramic full length headers, 350 crossmember,and 2 1/2 exhaust kit all fit with no mods or leaks ,only thing i had to cut the pipes length a bit to fit them exactly the way i wanted it to sit .otherwise i was very happy with all the parts.
Yeah, Floor shift model is different. I understand some cars may be slightly different albeit G bodys none the less.
The real killer is the fact that these headers were marketed as a non interference fit for 78 to 87 monte carlo v8 w/ column or floor shift automatic. So some models may be different in how these headers fit. I clearly had issues.
another poster said the motor is too far back. That said the 350 sits in exactly the same position as the 305 it had in it since
1987. If it was built wrong then I would be shocked it passed QC.
All I know is if I was making headers , stuff like this would be in the scrap pile never to go into a box and be shipped.
I just hope the guy that built this set does not drive a monte carlo.
The real killer is the fact that these headers were marketed as a non interference fit for 78 to 87 monte carlo v8 w/ column or floor shift automatic. So some models may be different in how these headers fit. I clearly had issues.
another poster said the motor is too far back. That said the 350 sits in exactly the same position as the 305 it had in it since
1987. If it was built wrong then I would be shocked it passed QC.
All I know is if I was making headers , stuff like this would be in the scrap pile never to go into a box and be shipped.
I just hope the guy that built this set does not drive a monte carlo.
If you didnt install the sbc yourself ,try to take a pic of the motor mount, see what the installer used, could have used a v6 set of mounts or something but then they would have had driveshaft length issues too.sounds puzzling,would have somekne look at it with another g-body sbc car/or member meet with you and compair the two.if you were in michigan i would take a look at it and show you my set up. Either way good luck at getting it all straight.
I installed the motor w/ OEM mounts from Autozone for the 305 style engine, The drive shaft had
to be shortened about 3" from the stock length. I know it seems odd but it's the way it works.
I have checked the numbers and the cars original motor and transmission were in the car prior to the last
2 which I installed myself. The first 350 was having issues with the oil pressure. The block and crank were
both worn. The new motor is a GM performance crate motor.
to be shortened about 3" from the stock length. I know it seems odd but it's the way it works.
I have checked the numbers and the cars original motor and transmission were in the car prior to the last
2 which I installed myself. The first 350 was having issues with the oil pressure. The block and crank were
both worn. The new motor is a GM performance crate motor.
Post a few photos of the fitment problems. Jegs and Summit racing headers are Flowtech. Im thinking about Jegs headers for my 78 El Camino. I would like to know of any problems, Like can a big oil filter be used ?
Doug
Doug
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