6 replies to this topic

[PACINO]

Hi friends! I'm hesitating between these head gaskets for my 1300 engine and high compression pistons.
-HEAD GASKET 1300 BLACK BK450 Compressed volume is approx 3.3cc.

-HEAD GASKET 1300 LATEST GENUINE TYPE. Ref/GUG702560HG Compressed volume is 4cc.
Does this volumetric difference between one and the other mean that the second is fatter and therefore there is less compression in the combustion chamber?

Thanks in advance

[timmy850]

Either thicker or a slightly bigger bore size would make a higher volume

0.7cc makes about 0.1 to 0.2 units difference to the compression ratio on a 1275 engine - eg 9.60:1 to 9.44:1

I’d pick the best quality gasket

[PACINO]

Thank you very much Timmy! So I'll choose the first one (Payen BK450) for two reasons. Firstly, because I've assembled it in the past and it has never broken, which I cannot say about the copper ones. And second, it is thinner and I'll not lose compression.

Edited by PACINO, 19 November 2023 - 12:59 PM.

[Turbo Phil]

Make sure you seal the gasket after fitting using the correct procedure for the BK450.

Phil.

[PACINO]

Hello Turbo! I first clean both surfaces well (I don't use any type of paste or special silicone) then I put the gasket in the correct position, I put the cylinder head and rockers asembly. I approximate the nuts by hand, and I begin to tighten them in the correct order . A tightening in three batches. And that stay perfect.

[Turbo Phil]

Hello Turbo! I first clean both surfaces well (I don't use any type of paste or special silicone) then I put the gasket in the correct position, I put the cylinder head and rockers asembly. I approximate the nuts by hand, and I begin to tighten them in the correct order . A tightening in three batches. And that stay perfect.

That isn’t what I was referring to. The correct torque sequence is relevant regardless of the gasket type used.
The BK450 has sealant on its faces, to allow this to take hold it is recommended to clean the block and head faces with methylated spirits, install and torque the gasket as per normal, then run the engine with no coolant for 40 seconds. After allowing the engine to cool retorque the head and fill the engine with coolant.
This procedure allows the sealant on the gasket to adhere properly and ensure best reliability.

Phil.

[PACINO]

Yes, I had read those specifications about the BK450. And I'll do it this way once the cylinder head is tightened.
Thank you very much for your interest Phil. Here you have a friend.

Kind regards
Luis