Big block headers for Monte Carlo
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G3GM :: G3 Tech :: Engine & Driveline
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Big block headers for Monte Carlo
I'm looking into headers for the GM 454 I am planning to buy. GM Performance recommends headers that have 2" primaries, 3 1/2" collectors, and are 36" long.
Did a search at Jegs, and this Hooker model came up: https://www.holley.com/2455-1HKR.asp
However, it says they fit 64-74 Monte Carlo, and mine is a 1975. Is there a reason they don't fit the 75? I thought the 74 and 75 were identical besides some "details", and 75 was
the last big block year as well.
Did a search at Jegs, and this Hooker model came up: https://www.holley.com/2455-1HKR.asp
However, it says they fit 64-74 Monte Carlo, and mine is a 1975. Is there a reason they don't fit the 75? I thought the 74 and 75 were identical besides some "details", and 75 was
the last big block year as well.
Fishgrinder- G3GM Member
- Street Cred : 4
Re: Big block headers for Monte Carlo
1974 was the last year for the 454 I think. I don't see why they wouldn't work. I think they cut off the search criteria by the year because they were not avail in 75. You may have some clearance issues however- my headers are 1-5/8" primaries and I have to jack the car up super high in order to get them on, especially the drivers side.
Could you use Shorties? Chris (73 454 Monte) has a 454 w/ shorties, don't know if they are 2" or not but I think they're working fine for him.
Could you use Shorties? Chris (73 454 Monte) has a 454 w/ shorties, don't know if they are 2" or not but I think they're working fine for him.
77mali- Donating Member
- Street Cred : 62
Re: Big block headers for Monte Carlo
75 was the last year for 454.
but the first year for CATS. so legally you can use them up to 74![Big block headers for Monte Carlo Icon_t13](https://i.servimg.com/u/f74/12/69/99/95/icon_t13.gif)
i have shorties on my BB. but dont know tha size.![Big block headers for Monte Carlo Icon_s10](https://i.servimg.com/u/f74/12/69/99/95/icon_s10.gif)
![Big block headers for Monte Carlo Motor_10](https://i.servimg.com/u/f74/12/69/99/95/motor_10.jpg)
![Big block headers for Monte Carlo Copy_o10](https://i.servimg.com/u/f74/12/69/99/95/copy_o10.jpg)
i had to trim the edge of the clam to fit header
![Big block headers for Monte Carlo Motor_11](https://i.servimg.com/u/f74/12/69/99/95/motor_11.jpg)
but the first year for CATS. so legally you can use them up to 74
![Big block headers for Monte Carlo Icon_t13](https://i.servimg.com/u/f74/12/69/99/95/icon_t13.gif)
i have shorties on my BB. but dont know tha size.
![Big block headers for Monte Carlo Icon_s10](https://i.servimg.com/u/f74/12/69/99/95/icon_s10.gif)
![Big block headers for Monte Carlo Motor_10](https://i.servimg.com/u/f74/12/69/99/95/motor_10.jpg)
![Big block headers for Monte Carlo Copy_o10](https://i.servimg.com/u/f74/12/69/99/95/copy_o10.jpg)
i had to trim the edge of the clam to fit header
![Big block headers for Monte Carlo Motor_11](https://i.servimg.com/u/f74/12/69/99/95/motor_11.jpg)
1973 454 MONTE- Donating Member
- Street Cred : 36
Re: Big block headers for Monte Carlo
1973 454 Monte: is there something you don't know about Montes? ![Wink](https://2img.net/i/fa/i/smiles/icon_wink.gif)
Then the cat must be the reason for cut off at 1974.
Jegs have lot of shorty headers, but they are all 1 3/4" with 3" collector. Doubt if it's a big deal if I settle with 1 3/4" though. Chevy High Performance did a series of tests on the 454 HO, sticking with 1 3/4" for all the combos.
http://www.chevyhiperformance.com/techarticles/89618_project_454_ho_engine/viewall.html
Perhaps 1 3/4" is even better for low end torque than 2"?
![Wink](https://2img.net/i/fa/i/smiles/icon_wink.gif)
Then the cat must be the reason for cut off at 1974.
Jegs have lot of shorty headers, but they are all 1 3/4" with 3" collector. Doubt if it's a big deal if I settle with 1 3/4" though. Chevy High Performance did a series of tests on the 454 HO, sticking with 1 3/4" for all the combos.
http://www.chevyhiperformance.com/techarticles/89618_project_454_ho_engine/viewall.html
Perhaps 1 3/4" is even better for low end torque than 2"?
Fishgrinder- G3GM Member
- Street Cred : 4
Re: Big block headers for Monte Carlo
I looked for them too & couldn't find any shorties with the larger diameter collectors or primaries you specified.
Yeah- LOL he's had like 50 Montes that's who I'd ask too. Is the last 454 in 75 true for Chevelle also?
Yeah- LOL he's had like 50 Montes that's who I'd ask too. Is the last 454 in 75 true for Chevelle also?
77mali- Donating Member
- Street Cred : 62
Re: Big block headers for Monte Carlo
77mali wrote:I looked for them too & couldn't find any shorties with the larger diameter collectors or primaries you specified.
Yeah- LOL he's had like 50 Montes that's who I'd ask too. Is the last 454 in 75 true for Chevelle also?
According to this it was
![Wink](https://2img.net/i/fa/i/smiles/icon_wink.gif)
By the way, thanks for helping out!
Fishgrinder- G3GM Member
- Street Cred : 4
Re: Big block headers for Monte Carlo
Fishgrinder wrote:1973 454 Monte: is there something you don't know about Montes?
he knew you would like the 275-60-15s on your car as much as we like them on ours.....
![Thumbs up](/users/1813/58/83/10/smiles/779362.gif)
1973montec- Donating Member
- Street Cred : 17
Re: Big block headers for Monte Carlo
You'll like this Fish....
http://www.centuryperformance.com/forum/showthread.php/44-Header-Tube-Sizing-and-Length
http://www.centuryperformance.com/forum/showthread.php/44-Header-Tube-Sizing-and-Length
77mali- Donating Member
- Street Cred : 62
G3GM :: G3 Tech :: Engine & Driveline
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