Magnum heads on LA block H.p increase

Slantsix64 said

Also iam a little confused reading on the swap from La heads to magnum everyone is saying to use AMC style lifters because the magnum heads oil up through the push rods, since i have a LA Roller 318 block with roller lifters already i can just reuse my current lifters? or should i use the magnum roller lifters from the magnum block?

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Pretty sure the lifters you have and ones from a Magnum are the same. Just make sure they have a hole in the cup and you should be good to go.

Slantsix64 said

And i been reading that some had issues with the push rod hole in the magnum heads they had to open them up a bit.

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Pretty sure that is only when the Magnum heads are used with a flat tappet cam. The FT lifters are shorter and change the angle of the pushrod which can make them rub. If you use the roller lifters, you shouldn't have an issue.