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Old 02-16-2017, 11:07 AM
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Default Headers/Dual exhaust conversion

I am going to install headers on my 87 305; currently the stock pipes merge into a single cat, then muffler, then split into dual pipes out the back end. With the headers, I want to make it true dual exhaust. To do so, will I need to replace the support crossmember, as with this product?

https://www.dixierestorationdepot.co...TH4&d=1210&p=1
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Old 02-16-2017, 11:11 AM
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Looks just like the G-Force unit I bought, works well but they are a bit "fiddly" to install. Maybe if you have access to a lift it won't be so bad. Not a bad price.
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Old 02-16-2017, 11:41 AM
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dual exhaust is a good idea, but
headers and holleys are for racecars..

to get the driver side pipe to tuck up better then yes, something needs to change..

if you use Hooker long tube headers? the driver side header hangs lower so the crossmember is not
absolutely necessary but you loose some ground clearance..

if you can weld, or know someone, you could mod your crossmember,
or just build one..

130$ Jegs free shippin
http://www.jegs.com/p/JEGS-Performan...50980/10002/-1
or
175$ Iceman, check shippin price
http://www.gbodyparts.com/product_in...cc49d988b39556

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Old 02-16-2017, 11:56 AM
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[QUOTE=JJLT1;2147921]dual exhaust is a good idea, but
headers and holleys are for racecars..

Yeah, this won't be a race car by any stretch, but I want better than stock performance. So, I am considering either a number of mods (headers, dual exhaust, cat delete, cam, heads, intake, carb) on my 305 with 116,000 miles, or a new crate 350 swap.

I know the 350 swap will be more expensive, and either way I'll be doing a number of things I never have before. My mechanic tells me it's possible to do all the mods with the engine in place, even the cam if the radiator is out and front brace removed.
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Old 02-16-2017, 12:02 PM
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By federal law if the car came with a catalytic converter, it needs one forever. If there any emissions testing in your area, it will not pass. The exhaust will stink more with no cat but that is no big deal. It is a law that is widely ignored in may states, but it is a federal offense to remove the Cat.

Most street cars run best whit a X pipe in the system. Droning can be a problem. It all comes down to what your goals are for the car.
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Old 02-16-2017, 01:20 PM
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My county in NC doesn't require emissions testing on '96 and older (currently), so my inspection station has told me they don't check for cats; however I'm not opposed to them. New ones will flow much better than the old ones certainly.

About the X pipe, I've seen those systems for sale also, but didn't know what the advantage was. Cuts down on drone? Still requires the new cutout crossmember I guess, because it's still 2 pipes after the X.
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Old 02-16-2017, 01:38 PM
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[quote=designo614;2147930]
Quote:
Originally Posted by JJLT1 View Post
dual exhaust is a good idea, but
headers and holleys are for racecars..

Yeah, this won't be a race car by any stretch, but I want better than stock performance. So, I am considering either a number of mods (headers, dual exhaust, cat delete, cam, heads, intake, carb) on my 305 with 116,000 miles, or a new crate 350 swap.

I know the 350 swap will be more expensive, and either way I'll be doing a number of things I never have before. My mechanic tells me it's possible to do all the mods with the engine in place, even the cam if the radiator is out and front brace removed.
You will most likely need the dual exhaust if you install the 350, so it's a good first step. Don't expect huge of "gains" from it, mostly just noise. If you don't like drone, stay away from chambered exhaust like Flowmaster 40 series, which I installed on mine. If I were to do it again, I may not go with headers but instead use better cast iron manifolds. Yes you want an x pipe (IMHO), yes you still need the crossmember (either modified or new).

Also, it's not necessarily true that it will stink more without cats, if it is a healthy engine it shouldn't smell much regardless. I bought high flow cats for mine but the shop I used talked me out of installing them......I am going to install them when I replace my mufflers with something less annoying at highway speeds.

Last edited by kat0069; 02-16-2017 at 01:44 PM.
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Old 02-16-2017, 02:00 PM
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IMO
depending on the setup?? type and pipe diameter/length, muffler/flow/back pressure, routing/install,,
90% of the power increase will be from the dual exhaust, the other 10% average hp is not
worth the aggravation of headers- the install, ground clearance, burnt wires, plug access, leaks,
on a stockish motor..

and after all that youll still need to change the rear gears for the real potential to be known..
i'd do the duals without the header cost, and rear end gears and then see what you think about it..
gears will cost more than the headers, but show bigger returns..
if you want more??
if your thinking heads, cam, intake,
keep driving the 305 and find a roller cam 350 or 383 to buy or build, less down time just to swap..
up-grade money spent on a 350 or 383 would show bigger returns than on the 305,
same money for more torque/power..

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Old 02-16-2017, 09:13 PM
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Maybe a larger diameter pipes & muffler in a single exhaust, would add a bit of power ?

It's back to the limitations of the 305, for making power....

Do you still have the computer & the carb & distributor ? If you toss the computer, and replace the carb & distributor, cruise wont work if you have it..
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Old 02-16-2017, 09:30 PM
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Quote:
Originally Posted by steelybill View Post
Do you still have the computer & the carb & distributor ? If you toss the computer, and replace the carb & distributor, cruise wont work if you have it..
IIRC, There is a work around for this that I've read about on these great forums......it's got something to do with the black wire (for the cruise, under the dash) coming from the ECM needing to be grounded.
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Old 02-16-2017, 10:46 PM
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JJLT1 et.al.,

Will the Jeg's double hump cross member fit in an '87 EC without any problems? Since Jeg's does not show El Camino in its listing for this part, I am wondering. However, the bigger factor is the Jeg's unit is $100 less than the comparable G-Force which many seem to gravitate to.

Last edited by 57 Handyman; 02-16-2017 at 11:07 PM. Reason: clarification
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Old 02-16-2017, 11:48 PM
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Save your 305 tuning money and buy a new 350 crate motor, they start at about $1600 and lately both SummitRacing and JEGS have had free shipping
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Old 02-17-2017, 05:01 AM
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Quote:
Will the Jeg's double hump cross member fit in an '87 EC without any problems?
i'v been told by some other guys on here have used them with no problems,
yea I think they say they'll fit one cutlass supreme but not another cutlass supreme
with a different trim package too..

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Old 02-17-2017, 05:12 AM
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Quote:
Originally Posted by jpmdaddy View Post
Save your 305 tuning money and buy a new 350 crate motor, they start at about $1600 and lately both SummitRacing and JEGS have had free shipping
I spent my time last night browsing Jegs and Summit exactly for that; think I'm headed in that direction. Blueprint engines are cheaper than GM, but there may be a good reason why... anyone have experience there?
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Old 02-17-2017, 06:21 AM
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David are you going to keep the computer??

the GM motors are bran-new,, the Blueprint are probly all rebuilt..
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