New Marlin owner

[twinstacks]

Many thanks. I will give it a bash tomorrow after work. Looking at the state of the inside of the head it might be rusted together. Brute force it is then. How would I know if the exhaust valves have been converted to unleaded and if not is there a rough cost to get this done?

cheers

[lizbillings]

When I looked at the pictures there was no rocker cover on the engine. Could have been like that for a long time? Unlikely to have been converted if laid up over 20 years.
Liz

[stevejgreen]

Personally, if it were me, and the head does indeed need converting to unleaded, I would think seriously about getting the head ported to release a few more horses.
There are numerous Ford parts suppliers chose one local to you, posting heavy parts can get very expensive.

Take a look at this if you have deep pockets.
https://www.burtonpower.com/parts-by...gine-ford.html

[twinstacks]

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Finally got the head off and it doesn’t look to bad. Can anybody give me any info on the pistons or valves as I am going to put rings in it before rebuilding. Thanks

[greyV8pete]

Cant help with your specific question but previous experience with my head gaskets may be of use. Some years ago now, when I overhauled the Pinto head on my 2.0GL Sierra I fitted an aftermarket replacement cylinder head gasket that came with the kit. After all was refitted and everything torqued up to spec, imagine my horror at seeing coolant pouring down the sides of the engine!

The reason was that the reinforcing metal inserts around the bores in the aftermarket gasket were either too thick or too hard. This resulted in the gasket not squashing down and sealing the cooland passages correctly! Replaced with correct Ford gasket and all was well. ������ Peter.

[greyV8pete]

The +20 and the +0.5mm on the top of the piston means 20 thou oversize. Make sure if you re-ring the pistons that you get rings of this size. I would anticipate that there will be slight corrosion at least where the rings have sat for so long. In any case use a glaze buster in the bores before fitting new rings. However if the corrosion is too deep then a rebore will be required.

[greyV8pete]

The following link may help as it gives the engine code at which unleaded was factory fitted. Alas mine was too early, hence the rocky road of conversion! Peter.

https://www.burtonpower.com/tuning-g...aded-fuel.html

[twinstacks]

Thanks everyone. This engine has only done 12000 miles since it had its first rebore. There is no piston movement in the bores. I am going to take them out and deglaze the bores but would you recommend new rings? Not going to do the shells because if it really needs them I can do it at a later date as it’s not a big job and doesn’t need the engine stripped. What’s the collective thoughts.

Thanks again

[djj_engineer]

Might I suggest that you do not use the device that caused the scratches in the cylinder head. The piston also shows these scratches. Also the cylinder head gasket used has overlapped the waterways perhaps the replacement does not.

[stevejgreen]

Thanks everyone. This engine has only done 12000 miles since it had its first rebore. There is no piston movement in the bores. I am going to take them out and deglaze the bores but would you recommend new rings? Not going to do the shells because if it really needs them I can do it at a later date as it’s not a big job and doesn’t need the engine stripped. What’s the collective thoughts.

Thanks again

It rather depends on your budget and your forward plan, you can spend £100 alone on a set of +20 piston rings for all four pots at Burton Power!

If you start spending serious money you might as well continue to do so and do a full inspect/rebuild over the winter season.