Header Gaskets....

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rgp266

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What is the best header to Head gasket out there? I would like to put fuel injection on my '65 small block Valiant and everything I read about it says to make damn sure you seal them to the head. Any leaks will throw the computer off. How about it?

Thanks
Bob
 
Percy's Seal-4-Good Header Gaskets 66037, Remflex are good ones. They are made from multi-layered "dead soft" aluminum, just be carefull these type of gaskets break very easy, they are made to compress and do not flex very well with out breaking
 
d1970 said:
Percy's Seal-4-Good Header Gaskets 66037, Remflex are good ones. They are made from multi-layered "dead soft" aluminum, just be carefull these type of gaskets break very easy, they are made to compress and do not flex very well with out breaking
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those Percy's look like a good option also .
 
70Duster440 said:
Another thumbs-up for Remflex...
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Sounds good. On the REM-FLEX gaskets do I use the 6004 or the 6028 for weld bead headers? Assuming weld bead means a weld bead around each exhaust nipple on the block/head side, allegedly to promote sealing. Headers are Spitfires. Thanks, guys.

Bob
 
This is very important if you run a feedback loop,the O2 sensor.
Without one, not so much.
I have had very good success with the ones that came with my TTIs; sorry I don't recall the brand. They survived many many RnRs and kept their torque, and never leaked. I plum wore them out swapping engines every spring and every fall, for 5 years.
 
rgp266 said:
Sounds good. On the REM-FLEX gaskets do I use the 6004 or the 6028 for weld bead headers? Assuming weld bead means a weld bead around each exhaust nipple on the block/head side, allegedly to promote sealing. Headers are Spitfires. Thanks, guys.

Bob
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Those are both for later Magnum 318's. Take a closer look at this page and be sure of what you actually have in your car. If it's a '65 273 then you need the 6016.

Remflex Chrysler page 2: V8
 
70Duster440 said:
Those are both for later Magnum 318's. Take a closer look at this page and be sure of what you actually have in your car. If it's a '65 273 then you need the 6016.

Remflex Chrysler page 2: V8
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My bad. Engine is an '87 318 and will use EQ heads which I thought had the late model Exhaust port. I did not see anything specific for those heads.
Bob
 
Compare to 6027, maybe?

6027-2.jpg

N 6027 -- MOPAR Small Block V8- Pre Magnum, 318, 340,360, 1-1/4" x 1-3/4" End Ports,2/Set
 
70Duster440 said:
Compare to 6027, maybe?

View attachment 1715151182
N 6027 -- MOPAR Small Block V8- Pre Magnum, 318, 340,360, 1-1/4" x 1-3/4" End Ports,2/Set
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These look the closest to what I have. I've spent the past two days measuring every thing in sight but nothing on their site agreed with what I have for exhaust port opening. Thanks 440 and to the rest of you also.

Bob
 
Bought Percy's for my 1970 340. They leak. I re torqued per the manufacturer recommendation, ready to try remflex now.
 
MrGasket Ultra seals are good,if you cant get your headers to seal with those something else is wrong.
Check for warped flanges first.
 
I used to have pretty good luck getting them to seal by cutting through the flange between the ports.
 
I always use the regular Mr Gskts. with great success.
But I learned decades ago to check and file the flanges flat, before every install, otherwise you do it again after being yelled at by unhappy customers.
 
inertia said:
I always use the Mr Gskts. with great success.
But I learned decades ago to check and file the flanges flat, before every install, otherwise you do it again after being yelled at by unhappy customers.
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A belt sander work good for that.
 
toolmanmike said:
A belt sander work good for that.
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Yeah, I start with power tools, - sometimes the welder, lol, - but the big long flat file is the "tell"..
Quality is way better than the old days, but still get bent/untrue ones today, as demonstrated by the number of folks needing to use Remflex etc.
 
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Ugh, I hate the weld bead "O-ring" header flanges. Its a poor way to do it as the flanges invariably bend when your torquing them down as there is nothing for them to bottom out onto. Have a machine shop throw them on the mill/belt sander and grind them flat. make sure you get the proper 273 sized port sized gaskets if your running the o-ring flanges, very important as the 340 O-rings wont even hit the bottom of the 273 ports. went through that with a set of 65 A Super comps on a 340.
 
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