Big block headers for Monte Carlo

by Fishgrinder Fri Feb 15, 2013 8:19 am

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.

by 77mali Fri Feb 15, 2013 9:08 am

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.

by 1973 454 MONTE Fri Feb 15, 2013 2:32 pm

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

i have shorties on my BB. but dont know tha size. Big block headers for Monte Carlo Icon_s10

Big block headers for Monte Carlo Motor_10

Big block headers for Monte Carlo Copy_o10

i had to trim the edge of the clam to fit header
Big block headers for Monte Carlo Motor_11

by Fishgrinder Fri Feb 15, 2013 3:54 pm

1973 454 Monte: is there something you don't know about Montes? Wink

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"?

by 77mali Fri Feb 15, 2013 4:04 pm

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?

by Fishgrinder Fri Feb 15, 2013 4:15 pm

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

http://en.wikipedia.org/wiki/Chevrolet_Chevelle#Third_generation_.281973.E2.80.931977.29

By the way, thanks for helping out!

by 1973montec Fri Feb 15, 2013 5:39 pm

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

by 77mali Fri Feb 15, 2013 7:03 pm

You'll like this Fish....

http://www.centuryperformance.com/forum/showthread.php/44-Header-Tube-Sizing-and-Length

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