Sn0wBa11

iTrader: (2)

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?

charcoal03silvy

iTrader: (1)

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

Rhino79

iTrader: (7)

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.

JFOLM

iTrader: (8)

Where did you find some for 100?

Sn0wBa11

iTrader: (2)

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.

dug

iTrader: (10)

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

How does the 4.8 like the tr220 cam?

Sn0wBa11

iTrader: (2)

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

AKlowriderZ71

iTrader: (22)

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

Fastcount03

iTrader: (13)

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.

Sn0wBa11

iTrader: (2)

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