stock felpro HG on .020" overbore

[tramp_drift240]

my cometics giving me too many problems and now im leaking oil into cylinder one, with 120 for the compression test. im wanting to just swap in a new felpro to get rid of the metal headgasket problems.

is it safe to use the stock sized (89mm) Felpro headgasket on a KA thats been overbored to 89.5mm bore?

[tramp_drift240]

i know SOMEBODY's gotta have some information about an overbored KA using different headgaskets.

ive got the Felpro now, i need to know if itll be fine with the 89.5mm bore

[liquid_cool]

no! its not safe..the reason your having issues with your multilayor is you no longer have a smooth flat serface...insted of the felpro crap..get your self a like .40mm copper headgasket and some sealer...you may be requierd to get meatal orings installd into your block..but you will never have a head gasket issue again..and a bonus..the copper gasket is reusable...even if the serface is slightly pited or uneven the copper gasket will seal it up...SCE makes the best ones..good luck

[tramp_drift240]

the head and the block have both been resurfaced.

ive read MULTIPLE threads where people have a Felpro HG with an overbore.

[carkook]

Ive heard that these aftermarket gaskets will only work with a perfectly smooth surface. If you dont tell your machine shop they will machine it and leave it with a slight texture to it, assuming your using a stock gasket that relies on that texture to help hold in place. Might be something too look into?

[JDS Performance]

In case anyone ever searches this here some FYI for you.

This is confirmed in my KA24DE Head Build video as well.



240sx KA24DE Fel-Pro Head Gaskets - Cylinder Holes measure just over 90mm

So if you have a .020 bored block you will be fine using these possably even .040 bored blocks (90mm)- if you go to .040 bored you "might" have a slight over hang of the gasket onto the cylinder walls - I know no facts nor have I ever heard/seen any facts that you will have issues with this though so....