Official boss block build

[GB10]

Pac 1533 are some of the best. They are a nitrided version of the Livernois springs, so seat pressure is a little higher and open pressure is too. 120lb seat pressure and 285lb open pressure at .550" lift. They use stock retainers and seats/seals.

 

[Dillon Dollar]

I just went ahead and picked up some livernoin springs with new seals

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[Greg Hazlett]

Nice!

 

[Surfstang2020]

Can't wait to see the end product !

 

[Dillon Dollar]

Lol I can't wait either

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[Dillon Dollar]

Do you fellas think I should get new retainers as well there is about 10k miles on the current ones

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[JPO8GT]

Retainers should be fine i would think if anything would wear it would be the triple grove locks but 10k isn't a lot of miles and those parts are pretty durable just my opinion.

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[Dillon Dollar]

Good deal

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[lethe]

Stock retainers? Sorry if i missed it posted somewhere. I went with comp retainers when i built my engine.

 

[JPO8GT]

Yes Livernois springs use stock style retainers & locks
They also use them on their stage 3 3v heads.
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[lethe]

I was asking if he had aftermarket or stock retainers still.

 

[Dillon Dollar]

They are either stock or comp im not sure

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[Dillon Dollar]

BMR k member and livernoin springs are here

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[Dillon Dollar]

Anyone know what head gasket I need to use for this build

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[JoshK]

This is a Ford head changing kit for that block. I will look up the link.

Here

http://www.tascaparts.com/partlocat...fo&PartID=858753&siteid=213668&catalogid=7530

 

[Bobby]

I let my engine builder decide which ones to use. I just told him what i was going to do with it and he went from there.

 

[Dillon Dollar]

Yeah I've seen the head change kits buy I have arp head studs already so I guess my question would be will regular 4.6 gaskets work or will I need a larger bore gasket

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[JPO8GT]

You need larger bore gaskets. You do not want to use stock 4.6 bore gaskets.
Cometic mls head gaskets is what i used on my 3 v Boss block build if your a 3.700 bore just order them 3.730 bore gasket .040 thick is the Ford Racing gasket thickness JPC and others also use Cometic for your application with the arp's you can also choose the thickness gasket you want but 40 thousandths is the FRPP gasket thickness so thats what i did.
Typically its recommended to go 30 thousandths larger than the piston bore on the gasket bore size I'd at least go +20 thousandths min.

 

[Dillon Dollar]

Thanks a lot

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[BruceH]

You need larger bore gaskets. You do not want to use stock 4.6 bore gaskets.
Cometic mls head gaskets is what i used on my 3 v Boss block build if your a 3.700 bore just order them 3.730 bore gasket .040 thick is the Ford Racing gasket thickness JPC and others also use Cometic for your application with the arp's you can also choose the thickness gasket you want but 40 thousandths is the FRPP gasket thickness so thats what i did.
Typically its recommended to go 30 thousandths larger than the piston bore on the gasket bore size I'd at least go +20 thousandths min.

Mine were .031" for the FRPP Big Bore head changing kit. In fact all of the frpp modular head changing kits I've used have had .031" head gaskets. The frpp gaskets are Cometic.