wavrdr

iTrader: (1)

Hey guys, I'm in the process of getting my 402 built and wanted to go with a cam that offered very broad power which should make the car extremely fun to drive on the street.

The cam will run in conjunction with ETP 215 heads @ 59cc giving me a SCR of 11.56 and a DCR of 8.67 with .040 Cometics...

What are everyone's thoughts on where the cam will make peak power? I understand that this will not be a max effort build and the heads are not optimal, but my 346 took an unexpected dump and left me with several high dollar/low mile parts to transfer onto/into another shortblock...

The engine will have the full list of bolt-ons as well: ported Fast90, EWP, LG LT's etc...

All thoughts are welcomed!

F8TEL402

iTrader: (2)

that is a BIG cam who said to go with that? I have 227 230 580 580 112 and I stop making pwr at about 5900

Lythropus

iTrader: (13)

Maybe he wants to rev past 5900...if you peak at 5900 you should look into a cam more suited for your application...my 347 cam is larger than 227/230 and still daily drives fine.

Cam doesn't seem large for a 402. If I had a 402 it would definitely have a 240's duration cam with .600+ lift intake and exhaust. I'm sure some cam experts will chime in.

Pwebbz28

iTrader: (31)

Why would you say that is a big cam? Thats somewhat small for a 402.

Here is a link yo my buddys 408 he had done. Had stock 241 heads as well.

GREAT curve.

https://ls1tech.com/forums/dynamometer-results-comparisons/462218-stock-headed-408-468-460-w-ls6-pacesetters.html

wavrdr

iTrader: (1)

I'm just hoping to get a full range of power out of the enigne as opposed to having an on/off cam....

This is a middle of the road cam and possibly a little on the smaller side, but I'm hoping it will mesh well with my smaller cc heads and work well as a package...

Ultimately I hoping for a peak at 6,500rpm with a slow downward taper to the 7k mark....

Thanks guys!

1997bird

iTrader: (2)

I would say that it will probably peak at about 6300-6400 rpm and have your slow ramp back down. At least that was how my cousin's ETP 225/FAST 90 set up worked on his 346(@0.050 dur 240/240 112+4).

wavrdr

iTrader: (1)

I hope so....I'm just a little worried about the 215's having a difficult time feeding enough air to the extra cubes...not to mention the tighter LSA "possibly" causing the engine to peak and then lose power ealier...

Anyone else?

NEVRLIFT

Did you check Camarokid's dyno? He has AFR 205's with similar SCR/DCR and cam size. The car made 500/490.

A big step up from the old Contour days huh?

Unfortunately I still have mine. Hopefully I'll have C5 by this time next year.

wavrdr

iTrader: (1)

So I guess you recognize my screen name from Contour.Org huh? It's been quite some time and I've been enjoying the Z06 ever since...Well until my 346 took a dump!

Anyways, yeah I checked it out, I'm just a little nervous with the tight LSA moving the curve to far dwon and the engine falling on it's face in the early 6k's...

I'd really like the engine to want to rev to 7k without trying, but without the low range sacrifice, thus my choice going with a smaller 402 cam...

Take care,

Alan

JL ws-6

iTrader: (50)

that cam sould peak in a 402 around 6200. I'm running something a little larger then that and it peaks at about 6500, but it's more a nitrous cam.

wavrdr

iTrader: (1)

Do you see power dropping drastically or should it be good to 7k?

Thanks for the insight!

JL ws-6

iTrader: (50)

no, actually my car pulls right to 7400, but the peak power is about 6500. I think alot of it is realted to the fast intake being a bottleneck.... I'll find out about that as soon as I get some $ to get a edlebrock port matched to the ET240 heads on my motor and slug it with an elbow.

JL ws-6

iTrader: (50)

I should mention that I'm also running a th400 with a big n/a converter, so dyno #"s really mean nothing... it makes over 700 rwtq on the dyno when they flash the converter LOL.

One of these days I'll post up the graph, it peaks at 445 rwhp at about 6500 and carries over 410 rwhp to 7400. IF I still had an M6 in the car the #'s would be about 70 hp higher if not more and would mean alot more.

wavrdr

iTrader: (1)

I hear ya on the tranny thing....

My main concern is that the engine does many things well primarily a huge fun factor for the street and makes people go at the track...I had a pretty healthy H/C 346 setup, just looking for the nasty power curve with the new setup!

Take care guys!

Alan

JL ws-6

iTrader: (50)

You'll be fine, when you see what the added CI does to the way the car drives, you'll wonder why GM didn't start with 402's in the first place LOL.

look@ the times in my sig, that's with a nitrous tune, tires spinning about 1.5 revolutions per pass on the tires, and the car is still spinning at least 4 full revolutions before the front tires pick up

F8TEL402

iTrader: (2)

My mistake it has a Peak of 6700 the dayley driver is peaking at 5900 Sorry...

I did go with a small cam for the 402. I was going to use that cam on my stock LS1 for some fun with just heads and cam and then went with the 402.
GO WITH THE AFR HEADS AND GO WITH THE 225 hands down I have the 205 and not happy yet...............

wavrdr

iTrader: (1)

I already have the ETP 215's...If I were to make a change I would be switching to the TFS 225's....

Thanks for the help guys!

JL ws-6

iTrader: (50)

you could send the ET heads back to them, and I think they could port them to any of the other port sizes they offer.. I do believe all the catherdal heads are based off the same casting. Might be alot cheaper option, and would for sure make more power with the added CI

wavrdr

iTrader: (1)

Thanks for the idea...I'm probably just gonna run with this setup for a little while and see where I'm at when the dust settles...

That may be an option in the future though....

Alan

JL ws-6

iTrader: (50)

I'd definately try it with what you have... and with a set of ET castings already in your possession... you can send them back to ET and have pretty much what is regarded as one of the, if not the best cathedral head you can buy.