Metal Head gasket 4AG(T)E 20v

[blacktop]

I might just get 2 TRD 0.8mm gaskets,

Cos i am pretty impatient i already ordered the Cometic one but I'm sure it won't take long to sell maybe $150 inc postage so i get 95% of my money back

[fixeruperer]

they say that grex and hks are re-usable, hehe wouldnt feel safe doing it tho. Ive tryed heaps of gaskets and the toyo one is quite good i use them instead now (for 4a anyway).

[Mr Revhead]

oh correction, 1.25mm

[blacktop]

Turns out the Cometic is about 1mm thick, so i will just put it on and lower the compression some other way, like pistons or something down the track

[-GT-]

About 1mm thick? As in 0.8mm, or 1.2mm? How did you measure ~1mm, as a tenth or two of a millimetre changes your compression ratio a not insignificant amount? And if it is exactly 1mm you're still increasing your compression over stock.

If you're going to just use that cometic one and run boost, i wouldn't be waiting until down the track to lower the compression some other way.

[blacktop]

Mah! she'll be right

I got the measurement from the packet, it is 40 thou and I'm pretty sure thats about 1mm.

it won't lower the compression enough to make a difference from the standard H/G i don't think, and running stock compression with boost should be alright as long as i don't load the engine up to much or red line every gear.

[Sam_Q]

all comes down to the tune, that 1.0mm might be the uncompressed thickness though..

[psychofox]

you know the cometic one won't ahve the right holes for the coolant passages for the 20V head.....see the differences in the thread I posted above....I would be using a standard Toyota 20V or TRD 20V one.

[blacktop]

It has all the right holes in all the right places, it seems to be some sort of mutant between the 16V and the 20V H/G.

It'll be right