KevSr88

Ok, so I bought a 02 5.3 and it has the 706 heads on it. I thought that if I could find sum 241 casting heads that they would be a better head to run on my 5.3. When I get done with the engine it will have a TEXAS-SPEED 224R cam, Gen 4 5.3 rods & pistons, Shoenfeld long tube headers, a truck intake, 4L60 trans w/2800 stall and 4.10 posi rear gear. All that is going into a 98 GMC 1500 SWB truck. When I called TSP about the 224R Cam, the tech guy told me to not run the 241's because the smaller valve 706's are a WAY BETTER HEAD!!!!!! I find that hard to believe....
Can someone with ALOT more knowledge about which LS head to use PLZ HELP ME!!!!!!!! Thanx Kevin

cookseyb

If Texas Speed told me a rooster would plow, I would hook him up!!

LS6427

iTrader: (2)

I made 500 RWHP with 241 heads on my 436ci stroker engine that I had built back in 2002. Those same heads from back in 2002 are on my new 390ci.

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JoeNova

If I remember right, the intakes flow similar and the exhaust side on the 241 flows like 10 CFM more. Compression will be higher with the 706, and they're used for CNC programs a LOT more often than the 241 and other LS1 based heads.

Tuskyz28

Interesting!!

cwls1

KevSr88

Thanx LS6427 & JoeNova I appreciate your input.

G Atsma

That's OK; the mental image will do here....

thunderstruck507

iTrader: (18)

http://houstonperformancetrucks.com/...h-flow-numbers

I wouldn't say the 706s are a "way better head" but they do flow similar despite the smaller valves and will have higher compression

LS6427

iTrader: (2)

Yup....they flow 304cfm @ .650

They were ported and I think the valves are larger than stock....work done by Agostino Racing Engines when they built my 436ci.

Badass engine way back then......

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KevSr88

What about the 706's cracking??? I've read quite a few articles, threads about those heads cracking alot......

Darth_V8r

iTrader: (4)

Yes that happens. I know the 2004 castech heads were particularly prone to it. I got bit by that particular issue. I'm not sure what the list of years is that they were affected by.

Personally I'd go to 799 or 243 heads, but that's me.

99 Black Bird T/A

iTrader: (4)

My 99 TA has TEA stage 2 5.3 heads in 706 truck heads with 2.02 Ferrera intake valves and 1.6 exhaust valve. These were installed in 2002 and have 125,000+ miles on them. The 5.3 seem to hold up good in my experience. See sig for detsils.

5.3 are easier. To get more compression. They can use so extra love on the exhaust side. If looking for 5.3 heads call TEA and ask for the NOS exhaust port for you 5.3s and hand touch up. Worth talking to TEA.

KevSr88

Thanx everyone for your input

Forcefed86

iTrader: (4)

That makes no sense to me either. The 241 has larger valves, only makes sense to go with them on a budget deal. Open up the area behind the valve, clean up the guide and casting a little home porting/cleanup and you'll be set. You'd have to mill them to get your CC as small as the 706's is all. I'd take .030 off the 241 and run it. I don't see how a 706 could keep up at like CC sizes.

KevSr88

I think that's what I'm going to do. My 241's are from 2000-03 so what I found out is they have a 66.67cc combustion chamber. Thanx Forcefed86!!!!!!

Forcefed86

iTrader: (4)

TSP guys have much more experience than me… and the small valve stuff may very well be a better casting. Just can’t see it making more power “untouched” than a larger valve head.

KevSr88

I read sum threads from a few yrs ago lastnight and it said that the 241's are the best head to run on a semi stock LS.
I dropped them off at the machine shop this afternoon so we will see.
I will keep you up to date with everything once I get them back and put on.
​​​​​​​Thanx again

wannafbody

iTrader: (2)

I just watched a video on facebook by Richard Holdener and stock 706 heads produced 2 more hp than stock 799 heads on a 5.3. It's probably the slightly higher compression of the 706 head.

gagliano7

https://ls1tech.com/forums/generatio...-vs-243-a.html

https://video-lga3-1.xx.fbcdn.net/v/...1a&oe=5A297B52