340/360 head on a 360 magnum

[1911a1]

What is required to install a 3671587 head to a 360 magnum block? I can find lots of information going the other way installing magnum heads on LA engines.
Running Magnum engines are much easier to find than the older 360s. Can you still use the roller cam with the earlier heads.
Thanks million for the help

 

[RustyRatRod]

Lifters that oil through the pushrods and oil through pushrods, OR drilling the oiling hole through the block deck on both sides. You could do both, but if so, I'd run an HV oil pump.

 

[gzig5]

LA heads on a magnum block need to be converted to lifters and rockers capable of being oiled through the pushrods. Need to use an LA intake.

 

[273]

Oiling the rockers is gonna be the biggest problem, need aftermarket shaft rockers that get oil from push rods or rig up some other way to get oil to them there's been a few ways.

 

[1911a1]

Where would I find these lifters and rockers at? The push rods I know would be like the ones in my Pontiac engine.

 

[1911a1]

It’s beginning to look like I need to just run an older LA 360 engine.
I looked into punching out the 318 that in my car and running higher compression pistons and found out a lot of 318s can’t even be bored 60 over.

 

[mopowers]

The stock magnum lifters will work. You just need to pony up for a set of aftermarket rockers that are drilled correctly to allow for pushrod oiling. PRW, Harland Sharp, and others all make them. It's not a huge deal.

 

[cookietruck]

These would work.

MRE - Aluminum Roller Rocker Arm Kit

The steel PRW rockers also oil through the adjuster.

 

[TT5.9mag]

The magnum engines already oil the heads through the lifters/pushrods. Use stock roller lifters, and measure for correct length hollow pushrods. Then use a shaft rocker (comp, Hughes engines, MRE, PRW) that oils the shaft through the pushrod. Easy peasy. Or you can drill the back of the heads and oil the shaft through the oil pressure port. I’m doing both on my W2 magnum engine. If you’d like more info on drilling the back of the heads, just ask. For a mild street deal, I’d just oil the shaft through the pushrod and rocker.

 

[TT5.9mag]

Can I ask why you want to run the 587 head on a magnum? The magnum heads are a much better option and are pretty easy to find.

 

[AJ/FormS]

and why would you want to bore a 318 to plus 060?
Is yours damaged?
EDIT
and why would you want to bore YOUR 318 to plus 60?

 

[Cranky]

and why would you want to bore a 318 to plus 060?
Is yours damaged?

Because he has one already? Not my choice but might be his.....

 

[oldkimmer]

Bore it to4.04 and use std 340 pistons. Lots have enough meat to bore them .130 thou. Kim

 

[1911a1]

Can I ask why you want to run the 587 head on a magnum? The magnum heads are a much better option and are pretty easy to find.

I realize they’re better. But they are known for cracking.

Mostly would like to run them for no real reason that is practical more for old school nostalgia

 

[1911a1]

and why would you want to bore a 318 to plus 060?
Is yours damaged?
EDIT
and why would you want to bore YOUR 318 to plus 60?

The oldest reason in Hot Rodding more power, sorta of a poor man’s 340.

 

[TT5.9mag]

I realize they’re better. But they are known for cracking.

Mostly would like to run them for no real reason that is practical more for old school nostalgia

Gotcha. Nostalgia is fine. The cracking problem is not something to loose sleep over though.

 

[273]

Just don't sink any money into the Magnum heads but if there functional and in no need in rebuilding then there fine until they do, magnum heads are good for 400 hp with a reasonable cam and cr.

I'd run as is and slowly save up buy on sales, Speedmaster or some other aftermarket head plus rockers etc.. then swap down the road.

 

[TT5.9mag]

Just don't sink any money into the Magnum heads but if there functional and in no need in rebuilding then there fine until they do, magnum heads are good for 400 hp with a reasonable cam and cr.

I'd run as is and slowly save up buy on sales, Speedmaster or some other aftermarket head plus rockers etc.. then swap down the road.

I’d put money in rebuilding magnum heads long before I put money in a 587. But I agree with your premise.

 

[jos51700]

I'll be the first to say it:

"What are you using this engine for?"

 

[jos51700]

And don't forget to check out our gun discussion.

 

[1911a1]

I'll be the first to say it:

"What are you using this engine for?"

It’s my fun beater run about car.

I’m trying to finish up my engine build for my 75 TA.
it’s the first engine I’ve completely assembled from scratch
I’ve helped do portions of builds but never the entire engine.

 

[jos51700]

It’s my fun beater run about car.

I’m trying to finish up my engine build for my 75 TA.
it’s the first engine I’ve completely assembled from scratch
I’ve helped do portions of builds but never the entire engine.

OK, knowing that, I chose to run the magnum heads, and not worry about the cracking valve seats. They perform better for street use, 1.6 ratio rocker arms and, IIRC, a slight bump in compression with better ports, too. And then if you're out running around, it's easier if you need parts on the side of the road or something.

It's all from the 'same' family and to me, that keeps it simple. The crosswind intake made it easy and I just ran everything on the front from the Magnum. I used a van PS mount to move the PS pump down below the factory battery tray.

Magnum heads on LA is easy. Oil-through pushrods and lifters (and the lifters are usually already there) and done.
LA heads on Magnum is a bit more challenging like others said. Oil has to be routed to the rocker shafts, either via block mods, or other means. I'm not sure how the aftermarket aluminum heads are.

That said, the few engines I've seen from the transition era have the galley drilled, whether Magnum or LA. So far as I know, you can keep the roller lifters with an LA head (Late LA engines are roller lifters) but others may chime in with more experience than me. So, it's probably worth looking at what you have before you make a hard decision.

Hopefully others will be along to review, it's been awhile since I did all this to my car.

 

[Kern Dog]

It’s beginning to look like I need to just run an older LA 360 engine.
I looked into punching out the 318 that in my car and running higher compression pistons and found out a lot of 318s can’t even be bored 60 over.

The oldest reason in Hot Rodding more power, sorta of a poor man’s 340.

First off, this isn't a GM engine. The iron used in Mopar blocks has a higher nickel content so the blocks don't have to be bored over as often as a GM block. I've taken apart Chevys at 50,000 miles that had a lot of wear and RV 440s with 80,000 miles that just needed a hone job....the stock pistons were reused with new rings.
Secondly, when you bore an engine too far, the cylinders will actually flex some and that will affect how well the piston ring seal in the bores. Going .060 over to gain a few cubic inches has been found to be a bad idea because whatever gains you might see with the extra cubic inches will be LOST to poor cylinder sealing.

 

[1911a1]

Thanks for the info on Mopars Almost as weird as dealing with Pontiacs.

 

[Rapid Robert]

good utube vid on this. "LA aluminum heads on magnum blocks?? can do, pardner" by the black hat garage. aftermarket rockers needed & not sure if this would apply to iron heads but I think so.