LE1 heads with Gm847
Registered User
Joined: Mar 2005
Posts: 12,312
From: Aurora, IL
Automatic trannies are easier on rear axles then the manuals. Also, if you are running street tires and not sticky radials or slicks, your rearend should be fine.
Thread Starter
Registered User
Joined: May 2006
Posts: 247
From: Kingsport,TN
Yea going to be running street tires may see some strip time. I just want a good cam to go with the good heads. I guess the LE1 cam would be the best and get the best hp. I just thought of the 847.
Registered User
Joined: Aug 2002
Posts: 1,509
From: Red Oak Texas
The Crane 10308-1 springs used on the LE1 heads can work with the GM 847 cam up to 6400 RPM or so. The heavy retainers and springs mass could make the valve trane unstable above 6400 RPM.
Making HP is easy . . . . just install a big cam. Making the car fast is alot tougher and involves creating a TQ curve that works best with the cars weight, gear, stall, shift RPM, etc, so we can accelerate the vehicle best.
The GM 847 cam with my ported heads will wanna pull to 6700-6800 RPM in a 350 and not have much power below 3000 RPM. This is why you will need a stall with this cam. You would want a 2800 (or larger) stall and some 3.73/4.11 gears and shift at 6700-6800 RPM (not real safe for a stock bottom end) for this cam to be the best choice.
Even though you "could" run this cam with stock gears and no stall, the car will accelerate much better with a smaller duration cam.
My LE1 cam has about 10-12 degrees less duration and will make ALOT more TQ in the 3000 RPM and lower range. This cam would work MUCH better with stock gears/stall and really come alive even with gears and stall. If you plan on shifting at 6200-6300 RPM (considered safe for most stock bottom ends), the LE1 cam is a MUCH better choice.
There are a few customers making 390-400 RWHP with the LE1 cam and heads and the HP/TQ curve will match mild gears/stall and 6200/6300 shift RPM much better.
Do not worry about the rear end. The stock rear end will last a long time with a stall and sticky tires. 1.55-1.65 60 fts and mid/low 11 second 1/4 mile passes are common with stock rears and no problems. A 6 speed can kill stock rear ends on street tires and getting 2.0 60 fts in cars running 13's.
Making HP is easy . . . . just install a big cam. Making the car fast is alot tougher and involves creating a TQ curve that works best with the cars weight, gear, stall, shift RPM, etc, so we can accelerate the vehicle best.
The GM 847 cam with my ported heads will wanna pull to 6700-6800 RPM in a 350 and not have much power below 3000 RPM. This is why you will need a stall with this cam. You would want a 2800 (or larger) stall and some 3.73/4.11 gears and shift at 6700-6800 RPM (not real safe for a stock bottom end) for this cam to be the best choice.
Even though you "could" run this cam with stock gears and no stall, the car will accelerate much better with a smaller duration cam.
My LE1 cam has about 10-12 degrees less duration and will make ALOT more TQ in the 3000 RPM and lower range. This cam would work MUCH better with stock gears/stall and really come alive even with gears and stall. If you plan on shifting at 6200-6300 RPM (considered safe for most stock bottom ends), the LE1 cam is a MUCH better choice.
There are a few customers making 390-400 RWHP with the LE1 cam and heads and the HP/TQ curve will match mild gears/stall and 6200/6300 shift RPM much better.
Do not worry about the rear end. The stock rear end will last a long time with a stall and sticky tires. 1.55-1.65 60 fts and mid/low 11 second 1/4 mile passes are common with stock rears and no problems. A 6 speed can kill stock rear ends on street tires and getting 2.0 60 fts in cars running 13's.
Thread
Thread Starter
Forum
Replies
Last Post
Victor Lamb
Suspension, Chassis, and Brakes
3
Aug 26, 2017 02:52 PM
NewsBot
2010 - 2015 Camaro News, Sightings, Pictures, and Multimedia
0
Jan 29, 2015 07:10 PM
NewsBot
2010 - 2015 Camaro News, Sightings, Pictures, and Multimedia
0
Dec 28, 2014 06:20 PM
