Alright guys Im not really knowledgeable about putting combos together, so I come for help. I have a 427 lsx block with a 4.125 bore,zero decked with a -2.8cc piston. Cam is around 246 254 .6xx .6xx 113 +3. I'm looking for a good set of heads that will give me good streetability for a dd. I think I need 72cc chambers to make 11.5:1 and I have the lsxr intake.

 

What kind of budget? Are you staying N/A or are you going to spray it?

I would suggest the TFS 23/45 heads from TEA. They flow awesome. You could get the LSXr Port Matched to them for a little more also.

 

Ls7 heads if you have that nice bore ftw. What lsxr intake are you talking about?

 

I was going to say a bad *** LS7 head either from Mast or PRC but was waiting to seee budget lol.

 

WCCH ls7 heads

 

I'd say wcch or tea, period.

 

What style of heads is the intake for (ie cathedral, L92, or LS7)?

 

This.

Mast or WCCH for rectangular.

Or TEA, AFR(Mamofied), Mast for cathedral port.

 

i have been looking at the same set up but with a 4.185 bore and 4.00 stroke

i was recommended by a few friends to go with PRCs 285cc LS7 heads,, if any one has experience with those chime in for the op thats looking ,,

i only have experience with stock ported castings

 

I don't have a budget I just want what would be best. I have a cathedral port intake. Also I've heard the isn't much diffrence between rectangle port vs cathedral port. Am I wrong?

 

ive been having the same question except its for an lsx 454. i was thinking ls7 or mamofied AFR 245 for mine

 

Yes, you are wrong. The differences are almost night and day.

With a cathedral port intake, you must use cathedral port heads. AFR and Mast both make very good heads. Personally, I prefer Mast's heads, but AFRs are VERY nice as well.

 

Peak horsepower might be higher by just a bit on a rectangular port, but from what I have seen on here cathedral ports tend bring more to the table in terms of area under the curve. If you have no budget go with the mast heads but I think a set of AFR's mamofied or not would get you very nice results as well. Since you already have a cathedral port FAST i see no reason to start over just to make the switch to LS7 style heads. Get a nice port match done on the intake and you'll be set.

 

http://www.mastmotorsports.com/2010/...sembled&id=370

http://www.totalengineairflow.com/pr...ylinder-heads/

 

Tea 235/245 I have a 427 lsx with tfs245 setup for nitrous. It has an aggressive cam in it but made 570 rwhp locked up in a c6 4l60 car then made 830 on a 300 with soft tune. For dd motor go cathedral you will like it better.

 

I asked afr about it and they said anything bigger than 245cc was too big for street like I want. I might go with mast, also lme said they can get tfs 245 to flow 360cfms at .600 they wanna charge 4700. Can't T.E.A get similar results? I've heard they are pretty good.

 

I personally haven't seen a PRC anything that has impressed me to make power.

 

TEA or Mast simple.

 

Allpros ls7 retro or the dash-1 head would be a great choice call Richard at w.c.c.h

 

I didn't want to be the one to say it.... but yeah I feel the same way.