243's on a 4.8?
 

Anyone ever done it? If so how'd it perform and was it worth it?

I picked up some 243's today with 8k miles on them for $100. I got them for an iron block 5.7 I wanna build but thought about going ahead and putting them on this 4.8 for the time being. Just wondering how well these heads work with the 4.8?

IIRC you'll lose a lot of compression and lose power. Would need to get them milled.

Again, I don't remember if that is correct or not, just off the top of my head that's what i think i remember hearing

Mill them. They come oem on the 4.8s from about 07 and up. They are on my 09, but I don't know if gm uses different pistons to offset the larger chambers of the heads.

Where did you find some for 100?

I got them from a guy I went to school with. He bought them for his ws6 but never installed them cause he ended up getting a heads/cam package from TSP. He knew nothing about them and said he'd sell em to me for $100.

yeah, the loss of compression will offset some of the gains from airflow.

How does the 4.8 like the tr220 cam?

It loves the tr220. Pulls very hard, especially up top

It will pull harder with the 243's. Get them milled, and get a pushrod length checker.

I would def have them milled .030 - .040 to get the compression back up and might as well do a valve job and clean the bowls up while your there.

Only thing I'm scared of is milling them too much since I plan on putting them on the 5.7 I'm gonna build. Probably better off just waiting I suppose, as bad as I hate to lol