Ozz1967

iTrader: (4)

Out of curiosity, from those who know, how well would this cam worth with TPI? Could it be tuned to run well? I have the possibility to get a TPI set up for cheap and it would be my foray into swapping from CCQjet to EFI...I know the RPM range is a bit high but that's ok, it's what is currently in the car. Engine is a 355. Looking for any and all advice. Thanks!

Summit Racing Part Number:LUN-20080721

UPC: 090127693551
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,800-5,800
Intake Duration at 050 inch Lift: 219
Exhaust Duration at 050 inch Lift: 227
Duration at 050 inch Lift: 219 int./227 exh.
Advertised Intake Duration: 270
Advertised Exhaust Duration: 278
Advertised Duration: 270 int./278 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.530 in.
Valve Lift with Factory Rocker Arm Ratio: 0.515 int./0.530 exh.
Lobe Separation (degrees): 112
Computer-Controlled Compatible: Yes
Grind Number: VDSC-270
Valve Springs Required: Yes

Abubaca

iTrader: (3)

I looked into this cam quite a bit. Finally went with a similar custom grind Lunati. It's gonna have very similar characteristics to the GM hotcam, but with better lobe profiles. Probably a tad higher RPM range than the TPI likes, but yes, you can tune for it, and yes it'll run well, especially if you get a higher flowing TPI. What heads are on that 355? Ultimately like all things, a system that works well is better than a hodge podge of parts. What are your ultimate goals for the car?

Ozz1967

iTrader: (4)

This cam is currently in the car. Heads are World Sportsman II heads. Car currently has CCQjet on it which works very well...but it's like all of us, I can't help but tinker...eventually I will be able to afford a Miniram for it (and then I'm done with the motor here for a while to focus on my 67).

Car is going be a great DD in the summer and occasional backup car when my other DD (winter bad weather) goes down. Motor currently puts 269hp to the wheels but is being gone through because I lost oil pressure and found bearing material in the oil.

Abubaca

iTrader: (3)

A miniram would sure take advantage of that cam. Again, not saying you'd be disappointed with the TPI from a butt-dyno point of view, but the MR is certainly better. The GM Hotcam was originally designed for the LT manifold, which of course.....well.....miniram.

Ozz1967

iTrader: (4)

Thanks Abubaca,

These are still future plans as it's still carbed at the moment and I'm actually really happy with how it runs. I just can't really resist tinkering...

Maybe I'll save the miniram for the 67....or will I LS it? ugh...so many ways to go.

Vanilla Ice

The hotcam for the LT1 is considered very mild.

In other words, the cam is too "big" for TPI, too "small" for LT1/miniram.

That said I'd use it on TPI since you already have it but I'd swap if/when going LT/Mini

Abubaca

iTrader: (3)

....I think finding a good deal on a used MR or converted LT1, is a GREAT performance upgrade to a head and hotcammed 350, and you can do it in an afternoon. Cheap, big performance bump in power AND RPM range, and it's easy. COMPLETELY different conversation than choosing the "perfect" cam from scratch for a brand new build.

Vanilla Ice

Right. And by then swapping cams you'd gain even more power and even more RPM. The hotcam is about the most dated and mildest cam in the LT1 world.

It's underwhelming. It was made to help boost an lt1 to lt4 power levels. Which weren't that much higher in stock form.

Orr89RocZ

iTrader: (20)

Hot cam is a fun cam. I just tuned a 383 lt1 with stock heads and intake, hotcam. 4.11 gear 9" and auto it made 280's whp and 312 trq. Very peppy car and fun to drive. Had some crappy headers and small exhaust. Stock converter.

Sounded stock to me, well mannered. It used most of the stock tune to drive it, didnt need much correction til wot

In a 350, it be a nice cam with mild lope. Lunati has more aggressive lobes and less overlap off the seat. Should idle smoother and be even more responsive. It will work fine with tpi but as stated it will run better with intake mods. All stock L98's run faster with intake mods lol

Vanilla Ice

My otherwise completely stock LT1 with 1.6rr longtubes tune and cam made 326whp 380tq while having 8 degrees of false KR issue I never tracked down ended up selling the car prior. Hotlapped a 12.5ET. Had 12.0 in it if I could track down the false knock and run in good weather.

The hotcam is a "neat" cam but for a 350 NON TPI engine it's a bit of a joke.

I will point out that a hotcam is capable of 32xwhp on a stock headed 350lt1. The cam I had was capable of 350whp with equal mods.

Orr89RocZ

iTrader: (20)

This was an auto with a 9" rear. Alot more drivetrain loss than a 10 bolt but yes 310-330 whp typical depending on condition and drivetrain. Manual will dyno higher

Usually see 260's whp in a bolt on auto lt1 stock cam.

Vanilla Ice

Mine was a loose stalled auto. Figure 300hp through a 9" rear.

...and still a stock 350

Hotcam is a poor choice. It's like upgrading from peanut to just stock lt1 cam. What is the point? Save a couple hundred dollars and get a cam that will provide triple the gains.

Abubaca

iTrader: (3)

it's not a choice...he already has it. .....but if we ARE putting cam selection back on table, (which the OP never mentioned)...then maybe the heads could be upgraded too. ...or why not a 383?...or even an LS?

As I said earlier, good for what you have, -and good for MAX power possible are two completely different conversations. .....and all I'm trying to say is that given the combo that he already has, using a TPI for now, and switching to a MR later sounds like a good plan. Not saying best ever, not saying best power, not saying he's gonna be an internet hero....just saying it's a good plan.

Orr89RocZ

iTrader: (20)

Op has the lunati voodoo 270 cam. Its a decent cam, better than hot cam imo

Abubaca

iTrader: (3)

No, you're right. They're very similar though. Much newer lobes of course. I introduced the HC to the convo earlier and got stuck on it. My point was simply that it sounds like the OP has good plan for what he's got.

Vanilla Ice

All I was saying is that both cams are not optimal on either setups mentioned, Future or far future. No big deal. It'll still be fun.

Orr89RocZ

iTrader: (20)

Lol have to define optimal. For sub 6500 rpm power, strong in the 3000-6000 rpm range, thats the duration you need in a 350 motor, even with good heads. Shorter runner intake ofcourse

More cam would be optimal for over 6500 rpm power.

Tpi is a 5000 rpm and less setup for the most part. Big tube runners or siamesed runners can extend to 5500-6000. Custom tubes of great diameter and welded up large port bases can go higher still

Vanilla Ice

There's only one time the hotcam or similar are ever considered optimal and that's if you go off budget alone. There are better grinds that give better power everywhere and anywhere you like. I could point out a cam that will best it no matter what setup you throw out.

They are "It'll-do" cams.

"That's all I have to say about that."

Ozz1967

iTrader: (4)

As for what's on the table...it all depends on what the shop finds in my motor. Lost oil pressure and found bearing material in the oil. It's already .040 so I can't go much bigger realistically there so if I need a hone or bore, then my block is no good because I won't trust a factory block to .060. If it's just a set of new bearings that I need, then most likely it will stay a 355.

Heads for now are off the table. I have enough to do the motor to get it running and nothing else at this point.

I simply have a line on a TPI set up for "cheap", and while I"m happy with the carb set up, I can't help but want to tinker...for better or worse...and since I have the cam, I was curious as to the thoughts about the Vodoo cam I already have because yes, Budget is HUGE right now...if I don't fix the car, I ship it back to me broke and buy a new couch and love seat with the left over for our house...

Hell, the TPI might end up on my 67....lol..who knows!

D&S 85 IROC

I'm using a roller cam from a fast burn 385 motor. the engine is a l-31, aluminum heads and a stock TPI. Got rid of the stock ECM using a fast EZ efi, world class t5 and the stock 3:42 gears and a tru trac dif. Car is a blast to drive..............

mrestrictrplate

iTrader: (2)

Fast burn 385 motor is zz-4 cam correct?

D&S 85 IROC

Yes I believe so