i hate the "which cam" posts.... but im ordering the 402 this week and im completely lost as to which cam! was thinking about the trex with a forged 347, but im going with the 402 instead... so i would like to go bigger.

anyone have any HP #'s they would like to share? or dynos? im looking for as much over 500rwhp i can get N/A.

 

your motor builder will/should have the correct answer

 

Give Jason a call at TSP. They've got a lot of experience with the 402.

 

Who is building your 402?? What are you going to use the engine for?? what heads are you going to use??

SOme times it may be a good idea to tell the engine builder what your going to do with the engine and let them build the whole thing.

 

if it was my 402,i would go 25x/26x, 24x/24x on a 111!

 

 

A touch more information please.

 

thanks for the help..... guess we have no need for the forum now.

would like some feedback from people who are actually using the cams. when i call and talk to each company they are just trying to sell me their cam... so it doesnt really do me any good.

anyways... the car is still going to be my DD, so i want to make sure im not getting in way over my head. i had somewhat of an understand of cams for the stock cube motor, but im lost with the 402. what once seemed like a big cam, really isnt as big with the 402.

i really dont mind an aggressive cam and rough idle. for those of you who are familiar... jeremy formato is a buddy of mine and will be tuning the car... so a "big" cam shouldnt be a problem! def. looking for over 500rwhp though.

 

A lot of tough questions as engines are build for a specific use.

Example: Yes I am looking at a 402, i.e Darton sleeved LS2.
PP LS 6 heads. I like the flow rates better then the AFR205.

Cam possibleities, but not locked in yet are: 230/239 585/585 112
Fast 90/90, dry sump oiling, plus a chit load of other things to make it all work

What is my car for?? DE's and possibley road races ITE & VX, does not have to be streetable.

I prefer lots of low end and a flat torque curve ( POWER UNDER THE CURVER) vs high end HP. ie I want to get out of corners and UPTO 140 to 160 ASAP.

Now a freind of mine has a Scoogie Dickens LS2 402 with AFR225 heads. Dont know the cam specs but he talked to the ppl at AFR to make it all work. He also road races, ITE and VX and does some track days.
Dont have all his numbers yet as he is still dialing the package in. But was close to 500 +/- rwhp and rwtq

 

OK you are looking at 500rwhp out of a 402. Two big things needed to know before you pick a cam is what heads are you going to use and what compression. With some really good heads AFR240 or ETP240 come to mind and a static compression ratio of 11:1 you are probably not going to need a real big cam to get to 500rwhp. Now if you are going to use LS6 heads then you are going to have to go with a more aggressive cam.

Now this is your daily driver. So what you want is power down lower in the RPM range. More aggressive cams move the power up in the range. So you want to get your power from your heads efficiency and the extra stroke not the cam.

 

good info in the last few posts. thanks!

the heads are nothing special. they are absolute stage 2 heads. got a really good deal on them, so thats what im going to be running!

 

My nephews little 408 build........

And a link to his info.........with sounds & specs
I gave him my thoughts on parts to use.........and it worked well
http://forums.corvetteforum.com/show....php?t=1386656

 

In that case I would then talk to your engine builder and give him the specs on the heads. I would not shoot for a rwhp goal. I would say this is what I got and this is what I want to do with it. i.e I drive this car everyday so low rpm grunt is the most important. Who cares if the engine only makes 475 RWHP and 475RWTQ if all that torque is available from 2500 RPM. Just an example I don't know where you may end up.

You want a blvd bruiser not a dyno queen.

 

It sounds a bit like your expectations are "inconsistant". 500RW requires a peaky all out motor that will not be a great daily driver and will likely lack in the torque vs HP trade off. If you back down a bit on you max HP expectation you can get what you want.
I am doing a similiar motor and aimed toward a durable streetable trackday setup. ~450 hp I think is reasonable. I speced a Comp Cams XTREME XE-R XER281HR - 232/234 - .595/.598. I have not run it yet so cannot vouch for the outcome.
Jeremy ought to know and if he has to tune it he should consult on the recipie.

 

yeah def. makes sense. i guess peak HP isnt going to be all that important. i will be spraying on top of it also... 150-200 shot, so the HP/TQ will be there when i need it. having the torque down lower in the RPM range would be better for everyday driving!

yeah ill be calling jeremy! hes running same motor with the T-Rex i think. im sure he will have some great input and info as to which setup!

thanks!

 

here is a really good thread that was started back up that discussed tony mamo's 383 that made 500rwhp, his heads and cam selection and many other things he did to make that motor run like it does.

there are several discussions about cam selection and size and why... bigger isnt always better

http://www.ls1tech.com/forums/showthread.php?t=495402

 

im in the works on finishing the long block of my LS2 403 and have been doing the same research. what cam should i go with?? couldnt find many 402 threads so i have looked at all of the 408's that have made alot of power and some that havent made peak power, looked at the heads they ran and the cam they selected. i have seen smaller lift and lower duration cams make more power over a wider band than the larger peak HP 408's.

so what makes more sense, usuable power in my opinion. this is why i sold the P1 blower i had. made 518whp at 6k rpms, 400whp at 4k rpms.

i would agree dont take someone's off the shelf cam because "we know it works approach". make the builder do some math on the heads and work the numbers on the cam spend a little extra on a custom grind.

according to my cylinder head machinist who also built the short block... im reusing my LS6 heads ported to 227cc that will be using stock sized valves for now @.600 lift my heads will flow 308-315 CFM(better flow than the out of the BOX option for way less). so running just enough lift to take advantage of the head flow is important BUT the intake will still restrict optimum flow of the heads. he is going to port the LS6 intake manifold BUT it still wont flow as well as a ported fast 90/90 which should allow the cam/heads to work together at an optimum rate(ported fast 90/90 added by the end of summer).

based on the goals and the use of the car and the heads that are going to be used.... my cam specs will be .608/.621 242/250 114+4 or 112+4 LSA hasnt been finalized yet. heads will be milled down to have a smaller combustion chamber CR 11.3:1, DCR should be in the high 8's i believe if not about 9 based on a calculator that i used. street tuned using a wide band 02 and a laptop with HP tuners. then hit the dyno to see the results and make any other final adjustments there.

if the motor makes 475-490 rwhp and 460-470 rtq ill be happy with it considering the route im going with building a budget 402(10k installed and tuned). ported 90/90 and direct port TNT 100 shot in the long run anyway.

and yes this will be a DD that i expect to put 15k miles a year on.

when i decided to retire this car from DD. ill go a little more extreme for more power.

 

oh and i work from home so im kind of cheating on the daily driver part, he he

 

I'm using a 244/250 cam for my LS2 402. I bought it from Rapid Motorsports who has done a lot of 402's that put out over 500rwhp. The 402 is an absolute torque monster so I wouldn't worry about it being to "peaky". Here's an audio of my car at idle.

http://video.ls1tech.com/video/f41ac...bcec502a83.htm

 

If you want to keep the car driveable how about a:
264/272 110 + 2