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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Biggest Headers on a G3

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G3GM :: G3 Tech :: Engine & Driveline

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Post by oldstofty Tue Aug 02, 2011 8:45 am

While at Norwalk a few weeks ago I found a crack in one the header tubes. These are extremely old headers 1 and 3/4 inch tubes, Long story short I purchased a set of Hooker Super Comp 1 and 7/8inch tubes where the Pass side goes over the frame. I havent tried to get the Drivers side on yet but Passenger side is being difficult. Any one know if the motor can just be jacked up or do i need to put the motor on a hoist and pull it up a few inches? Thanks
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Post by The Dude Tue Aug 02, 2011 9:47 am

Might as well just undo the trans mount & one engine mount at a time to get them in. I say one at a time so it's easier to line the mount back up. Don't bolt the headers on until you get both down in the bay.

Also, are you trying to go from the top or bottom? I found that going from the top & snaking them in worked after massaging one of the primaries on the passenger side, but then again I'm not working with an OBB. Driver side was cake. Seemed like there was more room.
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Post by Limey SE Tue Aug 02, 2011 10:58 am

Oldsmobile headers are a PITA on our cars I had to lift both sides up set header in and put motor back down in bay then mount the headers on the block tighten then done

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Post by oldstofty Tue Aug 02, 2011 11:28 am

Ok, I did my inch a 3/4 just by jacking the car up and sliding them in but these 1 and 7/8s are enormous. And last time i did these the drivers side was great idk how with the steering column it looks tighter but its not. I already got the starter dropped and the Oil filter and mount.
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Post by 74Malibu383 Tue Aug 02, 2011 11:39 am

I've got 1 7/8" Super Comps on mine as well, and yes they are enormous. I ended up having to go with a mini starter to make room.
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Post by oldstofty Tue Aug 02, 2011 12:58 pm

What about for the pass side? and are you running a big block?
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Post by 74Malibu383 Tue Aug 02, 2011 1:36 pm

Sorry, no, it's a small block. My starter is on the passenger side. Swaping the original out for a mini starter was my solution.
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Post by Limey SE Tue Aug 02, 2011 1:52 pm

and the olds has it on drivers side and a mini starter is not a Bad Idea OldsOfty most of the guys at Classicolds that are running BBO have went to a mini starter for clearance issues

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Post by oldstofty Tue Aug 02, 2011 2:02 pm

Ill look into it, first i gotta get the passenger side on. I pretty much stole these at the swap meet. no pits no rust look new inside and out, no dings $100.00
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Post by 74Malibu383 Tue Aug 02, 2011 4:30 pm

Wow. Great price. Nice work.
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Post by pila Tue Aug 02, 2011 8:52 pm

Why 1 7/8" instead of the 1 3/4 " ?? Seems like the 1 3/4' would be better on a stock engine ( it if is) Bigger pipes in many cases don't do as well as small ones. Just wonderin'....... Very Happy

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Post by oldstofty Wed Aug 03, 2011 8:24 am

Well I got them for next to nothin and they may be a little to big for my application but who knows when I may need them. My 1 3/4 were old as dirt and I didnt really want to weld them.. again, lol. Right now the Motor is pretty much stock with a bigger cam and aluminum intake and Holley 850. Runs 12.90s in the quarter.
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