Cometic Head Gaskets

Harleyc04 · 2023-02-01

I was looking at cometic's head gaskets, specifically the .040/4.055 gasket. Chrysler 6.1L Gen-3 Hemi .040 does anyone know if these gaskets are for both aluminum and iron blocks? it says on Arrington's site that they are 6.1L Cometic Head Gasket - shopHEMI.com but because of how the wording on the Cometic site seems to refer specifically to aluminum blocks, I'm trying to verify before I spend $200+ on a set. Anybody know?

Harleyc04

Discussion Starter · #3 · 4 mo ago

Rays04GTX said:
You're fine with the C5525-040, Cometic list all of the 4.055 gaskets as being Alum block, is your block still 4.055 bore ?
Just my opinion here but I would think C5876-040 (4.10 bore) would be better ,My experience with those 4.055's they are truly 4.055-4.060
Mr Gasket has a 4.10 .040 gasket ,part#3277G
And Flat out has one, but you have to call them or order it through summit Part # FOG-938344100 , might be over kill , they'll hold 20lbs boost and clear 1400hp with out blowing out.

the block hasn't been bored it's still 4.055". I am likely going with a 4.100"/.060" gasket so I can back the compression off a tiny bit. the heads had .008" taken off several years ago, and I just had them resurfaced and another .002"- .003" was taken off. if the factory head gasket is .037" installed then I should gain about .012". The Flat Out gasket is definitely more than I would ever need on this motor, but I'm going to see what Mr. Gasket has to offer, I definitely appreciate the tip!

2004 RC/SB
24" Dub Ballers, QA1 adjustable coilovers, parallel 4 link in the back and custom built lower control arms up front (only 14 lbs!), 600 lb springs up front and 300's out back. Rear axle set back 1/4" and front track narrowed 1.5"
6.1 based 392, Holley Terminator X standalone ECU, 8HP70 Transmission w/ PCS standalone TCU, Aluminum rad, Electric fan, Arrow Racing single plane aluminum intake manifold, Holley Sniper 92mm cable operated throttle body, 6.2L injectors, Billet fuel rails, FITech 50005 (twin 340 LPH pumps with 1/2 gallon surge tank), Mopar Performance CNC ported 6.1 heads, 11:1, 227/[email protected] .600/.600 w/Manley springs, Scat forged crank/pistons/rods, ATI 15% underdrive damper, 6.2 Oil Pump, remote mount dual oil filters, Longtubes, dual 3" w/x-pipe, a/c delete, full front driveline delete, Autometer wideband/egt/trans temp/oil press/fuel press, and some other stuff that I can't think of right now.
Factory gauges are also still working with the standalone 😉

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Harleyc04

Discussion Starter · #5 · 4 mo ago

Rays04GTX said:
are you still running those 6.1 CNC heads in your signature ? , I just picked up a set of the 5.7 version that Mopar sold out of the old catalog, had a set of those 6.1s they did well up against some of the "big" name porters at the time, they were roughly 320/[email protected] .600 on a 28in bench.

yes I'm still using those heads, they have served me well. I would like to do something about the port mismatch with the headers (Pacesetter 5.7) but I have always neglected to find a solution to it. I know car headers won't fit, but I have been wondering about headers for a newer model Ram, I think they're a D-port design like the 6.1?

2004 RC/SB
24" Dub Ballers, QA1 adjustable coilovers, parallel 4 link in the back and custom built lower control arms up front (only 14 lbs!), 600 lb springs up front and 300's out back. Rear axle set back 1/4" and front track narrowed 1.5"
6.1 based 392, Holley Terminator X standalone ECU, 8HP70 Transmission w/ PCS standalone TCU, Aluminum rad, Electric fan, Arrow Racing single plane aluminum intake manifold, Holley Sniper 92mm cable operated throttle body, 6.2L injectors, Billet fuel rails, FITech 50005 (twin 340 LPH pumps with 1/2 gallon surge tank), Mopar Performance CNC ported 6.1 heads, 11:1, 227/[email protected] .600/.600 w/Manley springs, Scat forged crank/pistons/rods, ATI 15% underdrive damper, 6.2 Oil Pump, remote mount dual oil filters, Longtubes, dual 3" w/x-pipe, a/c delete, full front driveline delete, Autometer wideband/egt/trans temp/oil press/fuel press, and some other stuff that I can't think of right now.
Factory gauges are also still working with the standalone 😉

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Harleyc04

Discussion Starter · #7 · 4 mo ago

Rays04GTX said:
The 09+ Ram headers will fit, need to bang a tube here and there.

looks like that will be my next purchase then. any idea if it's worth the money to get the Kooks instead of JBA? I want 1 7/8 or 2" primaries, but I don't want to spend double the money just for a couple hp.

2004 RC/SB
24" Dub Ballers, QA1 adjustable coilovers, parallel 4 link in the back and custom built lower control arms up front (only 14 lbs!), 600 lb springs up front and 300's out back. Rear axle set back 1/4" and front track narrowed 1.5"
6.1 based 392, Holley Terminator X standalone ECU, 8HP70 Transmission w/ PCS standalone TCU, Aluminum rad, Electric fan, Arrow Racing single plane aluminum intake manifold, Holley Sniper 92mm cable operated throttle body, 6.2L injectors, Billet fuel rails, FITech 50005 (twin 340 LPH pumps with 1/2 gallon surge tank), Mopar Performance CNC ported 6.1 heads, 11:1, 227/[email protected] .600/.600 w/Manley springs, Scat forged crank/pistons/rods, ATI 15% underdrive damper, 6.2 Oil Pump, remote mount dual oil filters, Longtubes, dual 3" w/x-pipe, a/c delete, full front driveline delete, Autometer wideband/egt/trans temp/oil press/fuel press, and some other stuff that I can't think of right now.
Factory gauges are also still working with the standalone 😉

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Harleyc04

Discussion Starter · #9 · 4 mo ago

Rays04GTX said:
which would you feel better about dinging up? is the Question.

what needs to be modified for them to fit, what all do they interfere with?

2004 RC/SB
24" Dub Ballers, QA1 adjustable coilovers, parallel 4 link in the back and custom built lower control arms up front (only 14 lbs!), 600 lb springs up front and 300's out back. Rear axle set back 1/4" and front track narrowed 1.5"
6.1 based 392, Holley Terminator X standalone ECU, 8HP70 Transmission w/ PCS standalone TCU, Aluminum rad, Electric fan, Arrow Racing single plane aluminum intake manifold, Holley Sniper 92mm cable operated throttle body, 6.2L injectors, Billet fuel rails, FITech 50005 (twin 340 LPH pumps with 1/2 gallon surge tank), Mopar Performance CNC ported 6.1 heads, 11:1, 227/[email protected] .600/.600 w/Manley springs, Scat forged crank/pistons/rods, ATI 15% underdrive damper, 6.2 Oil Pump, remote mount dual oil filters, Longtubes, dual 3" w/x-pipe, a/c delete, full front driveline delete, Autometer wideband/egt/trans temp/oil press/fuel press, and some other stuff that I can't think of right now.
Factory gauges are also still working with the standalone 😉

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