Demon355

iTrader: (1)

I just had a 355 built and after yesterday's dyno session, it has created a nice rod knock. It has made me re-think my setup and this is what I came up with after talking with a few guys at the session.

Old Setup: 355 TPI - mods are in sig

New Top end: 355 TPI - Edelbrock E-Tec 200cc heads, Edelbrock Vortec Base, LT4 hotcam (or ZZ9), 1.6 Rockers, AS&M runners, same bottom end, same exhaust etc...

I needed heads and new intake parts anyway, why not go Vortec? I want to keep the TPI. This car will spend most of it's day as a weekend warrior with the occasional track day. My question is should I keep the Hotcam or go for the ZZ9? What are some of your combo's, head/intake, intake/cam etc...

camarodarrell

I wouldn't run the hotcam with tpi intake. You need a cam that will take advantage of the airflow characteristics of the tpi intake. Since you have the beehive springs, I would run one of the new high lift cams from comp cams like the one with 218 intake 224 exhaust duration at .050". They are around .560-.580 lift which is perfect for the beehive springs with a max lift of .600. I would call comp or whatever cam company and talk to them about what cam to run with tpi.

3rdgenZ

iTrader: (1)

the LT4 hot cam has 218/228 @ .05 thats almost the same. but i do like the idea about the comp cam.

just check this out my friend:

Thunder Racing - Camshafts for your 1982-1992 F-Body

for you id go with 465 or the 466. ive been trying to tell people that thunder racing as really good custom cams for TPI, hsr, so on.... . tell me what you think.

btw the edl Etecs will help big time. a buddy of mine has a c4 with the hot cam and just the performers and hes running 12.9s, and thats with 308 gears.

Demon355

iTrader: (1)

Those are what I originally wanted, the Performers. Than I considered using the Performer RPM's with my LT1 intake. I have so many options...

I want to keep my TPI though so I think my choice is still on the E-tec 200cc heads and vortec intake. I've been reading up on some combo's and searching and some of the guys on here have really stout motors with this configuration. Some running mid 12's which is where I want to be N/A. Who knows, I might change my mind about a few things but I have plenty of time to think it over (winter).

Comp cam 63-08-503-8 seems to be a nice choice, what do you guys think? Or what about this one, 63-08-306-8? Anyone using any of these cams? The ones you suggested don't have a big duration, is that whats needed for a TPI engine?

3rdgenZ

iTrader: (1)

i think that the 63-08-466-8 cam in your 355 would sound and run great. the 306 and 503 have <in my on opinion> too much duration for a TPI LTR setup. i would keep the duration down under 230 at most.

btw what did you dyno?

Demon355

iTrader: (1)

Dyno was a bust. Engine needed tuning bad and ended up spinning a bearing, thus me rethinking my top end

Yeah, I thought that was the reason. So you think the 466 would be good then? Whats with the 113, what does that mean again? You know my setup pretty much so I'm just going on what you think would be adequate. The lifts mentioned in each cam is that with 1.5 or 1.6 rockers? The hotcam has the same duration as the 466 but the hotcam is on a 112 lsa and the 466 is 113, I don't know the difference.

3rdgenZ

iTrader: (1)

it would sound, well like a demon

buy anywho the 113 to 112 means very little in terms of HP, ultemently the 113 will just give you a better idle control. id be willing to say that those lift #s are with 1.5 rockers. to make sure id call them thou.


Edit: those lift numbers are with 1.6 rockers so your still good with your beehive springs. i also noticed that your using 1.5rocker. i think that the hot cam should be good enough with some 1.6 RR, that brings lift up to .525. so its up to you if you want more lift. i personaly think that the edl head would like more lift. but its your money. btw go with the 200cc heads