1991 360la heads

[91dowdge]

Does anyone know how much material can be milled off 1991 360la heads. Stick stroke with .522 Intake lift and .509 exhaust lift. Just trying to squeeze out some compression

 

[Cranky]

Never experimented with la heads but wouldn't think .030 would be too much. Check piston to valve clearance before milling....

 

[gzig5]

I've heard of guys taking at least .050" and up to .100" off, essentially getting rid of the open chamber. I've never held a set so modified though. I'd CC the chambers and then do some math to see if it is worth the effort for you, and how far to go. Different heads have different chambers and I'm sure the ones I'm thinking of were something from the early 70's.

 

[Slantsix64]

I’ve cut .035 off stock 360 heads I think the chamber cc size was 72cc? I forgot

 

[91dowdge]

I’ve cut .035 off stock 360 heads I think the chamber cc size was 72cc? I forgot

Google says 63cc

 

[91dowdge]

I've heard of guys taking at least .050" and up to .100" off, essentially getting rid of the open chamber. I've never held a set so modified though. I'd CC the chambers and then do some math to see if it is worth the effort for you, and how far to go. Different heads have different chambers and I'm sure the ones I'm thinking of were something from the early 70's.

What do you mean "worth it for me". And Google says theyre 63cc.

 

[318willrun]

I've milled .045 off LA heads. Many have gone .060

 

[oldkimmer]

U can also have them angle milled then u dont have to mess with the intake to head angle. Kim

 

[Kern Dog]

Google says 63cc

Google does not "say" anything. It displays written words.
The number is wrong. I would not count on Google or any AI program for specifications on anything without checking alternate sources. To know the chamber size, you need to measure it yourself.
I did earlier this year to a set of 1990 360 heads, casting number #308, the same type that you have.

The 360 build that has more turns than Willow Springs

See posts 217 and 223. I first came up with 72 ccs, then later realized a mistake I made which should have registered 68 ccs.
Resurfaced heads ate up some of the 72 cc number but that is still not 63. The Magnum heads may be 63. They had a smaller chamber than the #308 LA heads.

 

[junkyardhero]

30 is safe and you likely won't need to cut the intake to match.

i've gone 60 personally so i know it can be done, but you will 100% need to cut the intake for fitment.

 

[91dowdge]

Google does not "say" anything. It displays written words.
The number is wrong. I would not count on Google or any AI program for specifications on anything without checking alternate sources. To know the chamber size, you need to measure it yourself.
I did earlier this year to a set of 1990 360 heads, casting number #308, the same type that you have.

The 360 build that has more turns than Willow Springs

See posts 217 and 223. I first came up with 72 ccs, then later realized a mistake I made which should have registered 68 ccs.
Resurfaced heads ate up some of the 72 cc number but that is still not 63. The Magnum heads may be 63. They had a smaller chamber than the #308

I think my heads may be a hybrid magnum/la. It has a 195 intake valve instead of the 180 in the la. Also have oil holes in the push rods and lifters. Along with oil holes in the cylinder head. I could just be looking too deep into it.

 

[junkyardhero]

I think my heads may be a hybrid magnum/la. It has a 195 intake valve instead of the 180 in the la. Also have oil holes in the push rods and lifters. Along with oil holes in the cylinder head. I could just be looking too deep into it.

if there be shaft mount rockers, it be LA.

who knows what's been swapped around and changed. a lot can happen in 34 years

 

[gzig5]

What do you mean "worth it for me". And Google says theyre 63cc.

Paying for the milling of the head and getting a reasonable compression gain to make it worth the effort. If you do a max cut and it gives a quarter point of compression, is that worth the investment? Probably a few hundred bucks just to surface the head, and now your intake don't fit so it needs to be milled or you have to mill the intake surface of the head, which is another setup and more money. I'm saying do the math first so you know what you can get and the only way you can know what the chamber volume is is to measure it.