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#1 |
Registered User
Join Date: Jun 2016
Location: Hillsborough
Posts: 15
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Recommendation for exhaust header gasket for 350?
Hey All,
A newbie here. My mechanic will start installing a new motor tonight or tomorrow, a 350, in my 1967 C10. I need to get a set of exhaust header gaskets quickly...we have autozone, advance, napa, o'reilly etc. all near me. Any recommendations for what product I should pick up? Thanks |
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#2 |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 189
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Re: Recommendation for exhaust header gasket for 350?
You can use standard iron manifold gaskets (perforated steel with fiber core) for most small primary headers mounted to stock heads.
Be aware that your headers are going to leak. They will always be a problem (clearance, noise, spark plug wires). As I like to say, "Headers are for race cars and kids who have never experienced headers".....
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
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#3 |
Registered User
Join Date: Sep 2020
Location: Kennewick, Wash.
Posts: 232
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Re: Recommendation for exhaust header gasket for 350?
I have always used the factory metal manifold gaskets sandwiched to any header gasket with hi-temp silicone. The manifold gaskets go to the head side, and the header gasket on the header side. Mine have never leaked once tightened down.
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#4 |
Registered User
![]() Join Date: Nov 2017
Location: Richmond va
Posts: 179
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Re: Recommendation for exhaust header gasket for 350?
this is great timing on this thread!... I'm getting ready to replace the header gaskets on my nova, its been a few years, and they are definitely due!
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:chevy |
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#5 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
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Re: Recommendation for exhaust header gasket for 350?
FelPro nothing else, tighten them down run until hot do this twice and havent had to touch them in years.
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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#6 | |
Registered User
Join Date: Aug 2021
Location: Windsor Ontario
Posts: 22
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Re: Recommendation for exhaust header gasket for 350?
Quote:
Factory style coated with Permatex UltraCopper. |
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#7 |
Registered User
Join Date: Mar 2010
Location: Oregon
Posts: 189
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Re: Recommendation for exhaust header gasket for 350?
I use high quality no matter what brand. Fel-pro is a favorite, other name brands are fine as well. Higher quality would be layered metal and gasket material, less quality would be the fiber only material. I would stay away from racing copper gaskets.
Just make sure the gasket ports are the correct shape or size. They don't need to be an exact match to the header openings, but they need to be correct for the contact area to the head. Many different shapes of header port openings and generally only a couple different shape gaskets. If you have a choice of 2 different part numbers, pick the best fit to the sealing area of the header. You should have no trouble, but sometimes parts store employees have no idea how to correctly pick out parts. Bob PS: I would use header gaskets over stock manifold gaskets. Not to step on any ones feet ![]() Last edited by HotWheelsFan; 03-31-2022 at 09:56 AM. Reason: Added info |
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#8 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: Recommendation for exhaust header gasket for 350?
Few years back I tried a set of header gaskets made by Remflex. I dig them a lot. Spendy, but worth it.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#9 |
Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Recommendation for exhaust header gasket for 350?
A set of Fel-Pros will work fine. If you have cheap headers, you'll likely get leaks. If you have good quality headers with a thick flange, you won't have to worry about leaks.
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72 C10 lwb fleetside -stock 350/350 combo |
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#10 |
Senior Member
![]() ![]() Join Date: Oct 2014
Location: Eagle, ID
Posts: 3,004
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Re: Recommendation for exhaust header gasket for 350?
Remflex is the way to go! They make different port sizes. So, if you go that route, measure the port size and shape on your header and get the one that is closest in size to what you have.
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#11 |
Registered User
![]() Join Date: May 2013
Location: Coppell, Texas
Posts: 176
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Re: Recommendation for exhaust header gasket for 350?
When I switched from stock exhaust manifold to a set of Sanderson Shorty's, I went through a couple of different sets with no luck until I finally tried the layered aluminum. I think they are Mr. Gasket brand.
Not a problem since.
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1971 GMC C15 Sierra Grande SWB 1972 Chevy C10 Custom Deluxe LWB 2018 GMC Yukon Denali |
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#12 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,235
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Re: Recommendation for exhaust header gasket for 350?
In my younger years the flanges were always undersized and would leak like crazy because just tightening the bolts warped them. I was always replacing the gaskets but that wasn't the issue. The cheap headers were the issue. Now you can get SS flanges that are 3/8 think or more. If I had a gasket kit, from the motor rebuild, I would use them. Remember GM didn't use gaskets on the cast-iron manifolds from the factory.
Cheers |
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#13 |
Registered User
Join Date: Jun 2016
Location: Hillsborough
Posts: 15
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Re: Recommendation for exhaust header gasket for 350?
Thanks all for the advice about the gaskets. Much appreciated. I wouldn't have put headers on the truck myself, but the prior owner did, so they're what I've got...
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#14 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Recommendation for exhaust header gasket for 350?
Headers dont always leak, years ago I always had trouble with the flange on the collector but that was with the old 3 bolt flange.
Now I have Headman headers with header gaskets ( brand?) and the ball type flange on the collector. I have been running them for over 6 years without any sign of a leak. Just be sure to retorque your bolts after running it long enough to get everything hot. It's probably a good idea to check them a few times over the first week or so. |
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#15 |
Registered User
![]() Join Date: Mar 2014
Location: Simi, CA
Posts: 495
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Re: Recommendation for exhaust header gasket for 350?
My header bolts kept loosening, I tried high temp loctite, didn’t help. Installed some Proform self locking SBC header bolts (Part66753) and it solved the issue. 5 years leak free. There is a reason lots of motors came with manifold bolt lock tabs. Locking bolts or tabs are a must for me. Flanges should be at least 5/16” thick or they will warp.
An old man once told me all headers leak… he also said electric cars would never be fast. Posted via Mobile Device |
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#16 |
People know me
Join Date: Jun 2007
Location: Hermiston, oregon
Posts: 840
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Re: Recommendation for exhaust header gasket for 350?
Remflex are the only ones I use now and several of my hot rod buddies are on to them now as well a few of them have some serious hardware (496 stroker, Blown 540) I also wrap my header bolts in teflon tape and have not had them loosen up on me since.
Also dont cheap out on your headers and get some good heavy flanged ones also helps. They also make weld-on ball and socket collector flanges and this has been a game changer!
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1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels |
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#17 |
Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,131
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Re: Recommendation for exhaust header gasket for 350?
Locking header bolts and Mr. Gasket 'Ultra-seal' is what works for me. Tens of thousands of miles with no leaks. Do a re-torque on the header bolts after a few heat cycles. Then on the collector flange,....either cut them off and weld on some ball & socket type flanges, or find the manifold donut gasket that will fit in the flange and bolt them together with that INSTEAD of a standard gasket.
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#18 |
Registered User
![]() Join Date: Jan 2016
Location: Sugar Hill GA
Posts: 368
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Re: Recommendation for exhaust header gasket for 350?
Remflex is the ultimate header gasket IMHO. I've used them on three different cars and have never had a leak.
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1967 C10 Step side 1970 AMX 390 1977 Datsun 280Z highly modified with '95 LT1 power |
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#19 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Recommendation for exhaust header gasket for 350?
You can't go wrong with Fel-Pro #1444 for stock size ports. They have a steel core.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#20 |
Registered User
Join Date: Apr 2022
Location: Moorpark, CA
Posts: 756
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Re: Recommendation for exhaust header gasket for 350?
+ 1 on Remflex, especially because they have a large selection of port size/shape
However I have FelPro 1406 on my 357 motor |
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