'93 LT1

Hey guys, my 396 stroker assembly will arrive this Monday. I'll be picking it up after work and will start the build-up soon after.

I'm going with a set of AFR LT4 210's seen here part no. 033-1057. These heads (correct me if I'm wrong) should flow enough to support my 475-500rwhp goal.

Question is, what cam should I go with? Emissions are no longer a concern and fuel economy... well, I'm already going with a 396 so fuel economy isn't going to be very good anyway, so that's not much of an issue either.

Just wanted to know whether or not any of you are hitting those kinds of #'s NA and what cam would you reccomend. Thanks.


Ps. Anybody reccomed a GM847 cam? What are the highest #'s people have made with this cam. Is it an option for me or no ?

METALBEAST

iTrader: (1)

You can probably squeeze that much with a hydraulic roller setup. I know it would be cake with a solid lifter cam setup. You might want to think about that.

Taner, 2fast4Luv, Joe Overton and many others have done it with hydraulic cams so it can be done. Maybe one of these guys will jump in.

z28boysteve

iTrader: (9)

Untill you meantioned the 847 I was gonna ask if you've hear of that cam...

I've played with the idea on mr.gasket desktop dyno...
Ported LT1 heads, the 847 cam, a 52mm TB, headers, and 11.45:1 will make 500 even

The only part of that equation im missing is the cam, and TB

'93 LT1

I'm assuming that would be 500 at the flywheel right? Not at the rear wheels.

A lot of people are reccomending I go with a solid lifter. Something with 650+ on the intake and exhaust. Would that be about right? Not enough? Or overkill? This is my first time building up an engine so forgive my lack of knoledge in these sort of things. I'm still learning.

z28boysteve

iTrader: (9)

Look at your flow sheet,...... look at what lift gives
MAX flow.... you wanna cam with somewhere in the neighborhood of that lift number, the problem is with a HUGE cam you need HUGE springs which make it easier for the hydraulic roller lifters to bleed off, but solid rollers need to be adjusted constantly... Id say street car...847... Occasional street car... solid roller monster cam.

taner

iTrader: (6)

if you don't mind lashing valves from time to time go solid, but keep in mind you'll need to rebuild those lifters on a annual basis, if you drive it alot. i send mine out for a rebuild! city driving is not good for solid roller lifters! if you want a cam that big, efinitely go solid roller.

you could talk to Futral Motorsports, Allan knows his **** when it comes to spec'ing a cam. he did one for my good friend in his LS1, it works great with his heads.

g'luck on choice

00BlackSS

iTrader: (7)

awsome times taner...here is a guy that runs soild lifter cam car with a 383...its really nice

http://hometown.aol.com/one94ta2try/...age/index.html

he runs 9's N/A...i think hes the fastest LT1 right now

STROKED

iTrader: (10)

Technically its a 388

'93 LT1

Just out of curiosity, what's the biggest hydraulic roller on the market right now? The 847? Is it possible to get a custom hydraulic with more than 625 lift intake/exhaust ??

If I have to go with a solid roller, I will, but I'd rather get a hydraulic if I could, to avoid the maintainance issues I'd have with the solid.

TwoFast4Lv

iTrader: (8)

at this level Maintainance is ALWAYS a issue Does not matter what cam you pick if you want to play you have to pay Time is money and you will be giving time no mater what direction you take.

It sounds like you want a get it in and forget it car. The 847 is a good choice as are a few good custom grinds. I would shoot off the perticulars to say Bret Bauer and Get one made

METALBEAST

iTrader: (1)

That would be the LT1 King Joe Overton!

I have heard alot about the 847 Cam lately. Just curious but what are the specs for it?

Nasty_T/A_GT

Who are you planning on doing the heads? I would talk to them about the cam. Just my $.02 but I dont think you can pull 500 to the wheels with a gm847 and for the money involved in taking a N/A motor to that territory I would think about forced induction.

z28boysteve

iTrader: (9)

I dunno, after all it is a 396, trusty desktop dyno says a 396 with AFR 210 CNC out of the box heads, with 847 cam, and 58mm TB on stock intake, and headers will make the following with these compressions


FLYWHEEL!
10.5:1 532HP
11.0:1 543HP
11.5:1 552HP
12.0:1 561HP
12.5:1 570HP
13.0:1 577HP If streetability is a concern I have 11.5:1 and RACE with premium in the tank

1SLO6

iTrader: (8)

i would go with something like a custom grind camshaft. Off the shelf cams wont maximize power. Your power is all in your duration and in the grind of the camshaft. How it is degreed via the lobe seperation and the ramp. It may cost a little more but call around to some of the advertiser on the board and they will tell u the same. i went with a custom grind and i should be making about 420 to the wheels on a stock bottom end LT1. Just my opinion.

Nasty_T/A_GT

I have known a few people that would swear by desktop dyno until they built there cars and found out how far off DD is. I personally dont trust it for accurate numbers, I use it for comparison only. I was just looking at the flow numbers and I dont think that it can do it. I haven't seen any cars with the gm847 making near that kind of power (500rwhp). If he said he wanted 500 at the flywheel, it would be easy but 500 out back is a bit of a challenge N/A.

AdioSS

iTrader: (2)

Comp has hydraulic roller lobes as big as 278@.050 and lifts as much as .420" at the lobe (times the rocker ratio to get valve lift)