joejamesatou

Pretty sure I am leaning towards milled 243 heads but just wanted to see if I am missing anything. I am changing out the heads and intake on my 2500 Suburban which makes 325hp with a BTR Stage 3 Truck Cam. After months of reading and searching here are the options I was looking at.

1. 243 milled .030 for a CR of 11:1 and a NBSS intake and throttle body. Probably not ported to save funds, but hey who knows. Cheap and effective.

2. L92 heads milled as well for a 10:1 compression and truck intake. Not ported for sure.

3. Any other killer setup someone has that I don't know about.

Will probably be switching out the 3.73 gears for 4.10. This is a daily driver so no power adders or anything else crazy. Already has 1 7/8 inch headers and dual exhaust.

Also, can I still tow 4 times a year with a CR of 11:1 and 93 octane? Thanks guys!

jetech

I would not do the L92 route. 243's milled or maybe better yet for more torque in the lower to mid rpm range research using 862's or 706 castings. There are probably more than a few on here with that 6.0l with 862 combo. No milling required

FMonster

iTrader: (2)

I'd go 243s and the tbss/nbss all day long in a truck. Check your local pickapart, you can find the intakes there pretty commonly for under $75. Heads too if your halfway tool handy. Take a full metric set from 8mm-15mm deep sockets with several extensions and a ratcheting wrench set of the same. I also recommend taking a cordless drill with 3/8 socket attachment AND a swivel trust me on this. Makes life easier

jetech

Any head combo you choose, I'd research a combo that will produce the best torque numbers in the operating range you will be running this 3/4 ton Suburban. High hp numbers do not make for a great daily driver...BUT huge torque #'s do!

big hammer

Stock l92 headed trucks make a lot more torque then the cathedral ones...

big hammer

And the Stock l92 truck intake is the best truck intake GM made

jetech

most of the torque number increases are from the variable valve timing which the OP will Not benefit from. Here is an article HotRod did on the subject. It took the big headed engine spinning above 5000 RPM to best the smaller cathedral port heads in torque numbers.http://www.hotrod.com/articles/ccrp-...ylinder-heads/

big hammer

That’s actually a good test. They went to a fair bit larger Cam and l92 heads and hardly lost any low end tq, gained peak tq and gained 62 hp dang

joejamesatou

The cam I have in is 218/224 .553/.553 113+3. I don't think I would lose low end going from these 317 heads to L92.

omc8

iTrader: (7)

I would do the best CNC cathedral port 205 to 215 or even as cast and run the old ugly truck manifold and Long tubes TDS for exhaust.

joejamesatou

Just an update that I went with ported/polished set of 243's milled .030 with a TBSS intake. No regrets at all between 2-5k. Top end aint bad either.

Ls7colorado

iTrader: (3)

nice did you use the stock converter?
Also I would consider 4.56 gears over 4.10 unless you are constantly doing 70+ especially if your tire size is anything over stock hight

joejamesatou

Yup, still on the stock converter for now so I can still do some towing. And I already put in the 4.56 gears with a TrueTrac. Above 75 is a bit loud but it's just fine otherwise.

Ls7colorado

iTrader: (3)

nice!