u118224

iTrader: (3)

I have an '04 Suburban with 2 cracked heads (Castech 706s). Is the 241 head a worthwhile direct bolt-on replacement? I ask because used 241 heads are plentiful. I need to use the same truck intake and exhaust manifolds. Power increase isn't a goal. The Suburban has 159,000 miles and I don't want to purchase new 706 heads if I can save some money on something else.

427zm

iTrader: (9)

It should work, but you will lose a fair bit of compression. The 241 is a 66cc chamber, where as the 5.3 heads (706&806) are 63cc chambers. It will feel real sluggish. Each the classifed adds on here, and I'd bet you can pick up a replacement set of 5.3's for less than $200.

u118224

iTrader: (3)

Thanks for the info on compression, I didn't think about that. The problem with used 706s, though, is the possibility of their cracking in the future as well.

chrisfrost

iTrader: (8)

Just to clarify ,,,,,,,,the 706's and the 862's were used on the 4.8/5.3L and the chamber volume is 61.15 cc The 862's are not Castechs and thus have'nt had cracking problems

u118224

iTrader: (3)

Thanks Chrisfrost. So, used/refurbished 862s are OK, correct.

KCS

iTrader: (20)

I think the embossed battery symbol on one of the intake ports is the dead giveaway. I have three sets of 5.3L heads and I know two sets for sure are 862's and do not have it. The third set does, but I'm not sure if they're 706's or 862's.