alamantia

iTrader: (10)

I have a 2002 Z28 with 241 heads. I bought a brand new set of complete 243 heads with the yellow springs and sodium filled valves. I am ordering the TR 230/224/111lsa cam. I intend on swapping heads on my camaro and keeping the old 241's seeing as how they only have 36k miles on them.

I also have a 2005 Tahoe with the 5.3, which has 85k miles on it. I thought if I ever had to do engine work on the tahoe at least I would have a good set of 241 heads off my camaro I could use on my truck. I looked at the casting number on the tahoe heads which are currently on the truck and they say 706

I did a search and it seems that the 706 heads are desireable for f-bodys. My question is why? I under stand the the compression is slightly higer but thats about it. I read a lot of threads about them being good heads with porting, well all LSx are good heads with porting. Im wondering if holding onto the 241's with intensions of placing them on my truck would be an upgrade or a down grade?

5.3LJimmy

iTrader: (10)

It would be a downgrade. The 706 heads flow almost identical to the 241's on the intake and the same on the exhaust.
The 5.3 heads are popular due to the small combustion chamber and good flow potential with porting and larger valves. It also helps that they are a bit cheaper than the 243 casting. Which makes them a very good head for the money.

alamantia

iTrader: (10)

So if both the 706 ans 241 heads flow the same. Why would it be a downgrade? Is the slight size difference in combustion chamber that signifigant for a daily driver tahoe?

Again, only curious because I wouldnt want to hold onto the 241's if they will hamper the preformance or drivability of my truck. To me it doesnt sound like there would be a big difference if I am understanding it correctly

PREDATOR-Z

In stock form the 241s flow slightly better (bigger intake valve 2.00 Vs 1.89) but have a different bore size and are 66.7 cc instead of 61cc
So by milling the 241s 6cc you would benefit marginaly over your 706.