I have narrowed down two turbo cams for my build and i dont know which one to use i know both will probably do the job but maybe someone here can point me towards the right one!
here are the two=
239/235 .657/.646 116+4
240/240 640/630 117.5+5
The build
lsx 427 9.5-1 comp
ls3 or ls7 TFs heads
twin 67BB turbos .81 housings
1 3/4 x 3" SS tube headers
Single plane with elbow 102mm TB
4L80e 3600 stall
Mostly street maybe a 1/4 mile pass here and there and spin it to around
7K rpm heads and springs will be built around the cam. power goals in the
1KWHP range.

 

Triple 12


Who spec'd those cams?

 

Those turbos are too small for your goal IMO, and also both cams are too big for your turbos.

If you stick with those turbos I would want something in the low 230 range on a 115 lsa and shift around 6000rpm.

Go twin 70s and I would want high 230s cam, with a single split (dont like reverse splits personally), and shift around 6500.

 

Why are the turbos to small there are tons of guys making 1400whp with pte 6766's which are basically the same spec's as the Comp's and that is around 20-24psi.
Both cams were spec'd buy well known companies who have put out some high end builds so i know they have a clue.

 

You asked for some input and I gave mine. Take everything you read on the internet with a grain of salt

 

I did ask for input but all those Z0's making that sort of power with smaller turbos is not smoke and mirrors Corvette forum has a dozen+ with dyno proof.
I forgot one other cam i had also
231/239 .631"/.621" 116+6
I understand that everyone when it comes to cams has a different opinion that i have seen it would just be nice to have a general consensus for a change!

 

Is run the 231/239 if it was mine. Should drive really well with all those cubes and you want need a huge cam to make power with this little turbos. Might be a little too much split but it will work

 

I dont have the snails yet so i could do 70's but everyone turbo guy i spoke to said 67's were fine and 70's are good for 1600hp they are kinda like the cams lots of opinions!

 

Personally I like the reverse split cams I've ran them several times on cathedral setups and had good luck. Personally have not tried on a rectangle head setup at this time. As far as duration goes with the cubes you have I'd rock the 239/235 or the 240 strait. I've ran 248/242 reverse splits on 6.0 still even with that it came on like a freight train @ 3k. A rectangle setup may not hit that hard. Have you looked into the large cathedrals mast sells? I think they have a 275cc setup that may be worth lookin at if you haven't already purchased heads etc. just food for thought.. Hope to see a build thread on it!