rebuilding the head?

[sportbiker929]

Would I gain anything by rebuilding the head on a good running 198k 2F in my 87 60? I would also like to have the head milled .080 and have a multi angle valve job done. Is there a company that can flow my intake manifold? How about and aftermarket manifold? I figure if I have to remove all that shiznit to instal my headers, I might as well make some more HP.

All advice is wanted

 

[Mike S]

Is it broke?

M

 

[swank60]

Is it broke?

M

Roger that...

My PO had the head redone by a local "Cruiser Specialist" who didn't "doo-it-right" ( ) and the seals are already shot on the valves...

Ifin' she ain't broke...

 

[Mace]

Multiangle valve job is a waste of time.

Your valves flow plenty for a stock 2F

 

[brian]

.080 , that's plenty enough, some would say too much

 

[batman]

You could have it extrude and honed. But that might be a little much...

Extrude Hone’s Abrasive Flow Machining (AFM) of intake manifolds and cylinder head intake ports has already met the challenge for viability, reliability and cost effectiveness.

The process is applied to intake and exhaust manifolds, and cylinder heads, in order to remove rough cast surfaces that restrict horsepower efficiency. AFM enlarges and uniformly polishes air and fluid passages to maximize flow velocity through the component. All polishing is performed parallel to the air/fluid flow. The result is a surface finish "grain" achieved in the same direction.

 

[FJ40Jim]

Would I gain anything by rebuilding the head on a good running 198k 2F in my 87 60? I would also like to have the head milled .080 and have a multi angle valve job done.

Yes, a little would be gained by rebuilding the head and doing some good upgrades. But, would it be a good idea to take apart a good running engine and do $1000 worth of cylinder head work and gaskets and fluids and filters to pick up .2MPG and 4 HP? IMO, no.

FWIW, I don't recommend more that .050 mill. That gets CR to 9:1, which about max for cheap trail gas and a non-feedback engine.

Multi angle valve job is so '90's. I do radius valve seats on my heads now. Check out the Serdi bit profiles:
Serdi tooling
Expensive, but quick & easy and almost immune to operator error.

Slightly larger stainless valves are also a good idea. Better heat transfer and more resistant to burning and slightly better flow at the same amount of valve lift. Yummy!

 

[sportbiker929]

Thanks everyone