Help with cam choice
Thread Starter
Burning Brakes
Joined: Jan 2010
Posts: 884
Likes: 84
From: New Boston, NH
Help with cam choice
I know, another please help me choose a cam thread, but any help would be greatly appreciated. I am in the process of rebuilding my 75 L48. I have the TH400 with stock converter and 3.55 rear end. I am planning on the Dart SHP aluminum heads (http://www.summitracing.com/parts/DRT-127122/) and and Edelbrock 2101 intake. The block will not be bored out, only honed, and I will be using the stock pistons. Additionally, I will be taking out the egr, cat and y pipe and running straight duals. I will, probably next year, be converting to an OD transmission, just not in the cards right now.
My goal for this is to maximize power and torgue in the low to mid range. I don't intend to race the car, but would just like to have a fun and shall we say spirited driving experience around town. I anticipate spending somewhere in the $2000 range.
At this point, I have narrowed my choices down to the following:
http://www.summitracing.com/parts/HRS-CL113215-10/
http://www.summitracing.com/parts/HRS-CL110235-10/
http://www.summitracing.com/parts/HRS-CL110225-12/
I have obviously decided to do a roller conversion, but between the available choices, I'm not sure what I get and loose with each.
Thanks in advance for any help you can offer.
Bryan
My goal for this is to maximize power and torgue in the low to mid range. I don't intend to race the car, but would just like to have a fun and shall we say spirited driving experience around town. I anticipate spending somewhere in the $2000 range.
At this point, I have narrowed my choices down to the following:
http://www.summitracing.com/parts/HRS-CL113215-10/
http://www.summitracing.com/parts/HRS-CL110235-10/
http://www.summitracing.com/parts/HRS-CL110225-12/
I have obviously decided to do a roller conversion, but between the available choices, I'm not sure what I get and loose with each.
Thanks in advance for any help you can offer.
Bryan
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
I'd go with the first one. You may find it a bit sluggish from a stop due to the stock converter, but I take it you will get a slightly looser converter when you go with the OD tranny? You want about 2000 rpm stall with that cam.
Thread Starter
Burning Brakes
Joined: Jan 2010
Posts: 884
Likes: 84
From: New Boston, NH
Define sluggish. What is the stall of a stock converter?
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
My definition of sluggish: Can't burn the tires from a stop.
Not sure what your year car had for stock stall (which is why I said "may"). I'd expect a stock converter to stall around 1400 or so.
Not sure what your year car had for stock stall (which is why I said "may"). I'd expect a stock converter to stall around 1400 or so.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
http://oxforddictionaries.com/defini...ish?q=sluggish
I'd go with the middle one.
Keep the shiny side up!
Scott
I'd go with the middle one.
Keep the shiny side up!
Scott
Last edited by scottyp99; Feb 29, 2012 at 07:56 PM.
Thread Starter
Burning Brakes
Joined: Jan 2010
Posts: 884
Likes: 84
From: New Boston, NH
http://oxforddictionaries.com/defini...ish?q=sluggish
I'd go with the middle one.
Keep the shiny side up!
Scott
I'd go with the middle one.
Keep the shiny side up!
Scott
What would make the middle one your choice? If I understand this correctly, which is questionable, then the middle one would give me somewhat better performance off of the line but would sacrifice a little at the top end. Is that close?
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I would use the first one and a 1094 head gasket to get as much compression as possible. With 64CC heads you will be @ about 9.4 to 1. The Corvette with TH400 has a stock 2000 stall convertor. That and 355 gears you will be fine. No problem off the line.
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Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
keep the shiny side up!
Scott
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Stolen from another forum.
Rule of thumb, your bottom number of the operating range of the cam you want at least 200 RPM below the convertor stall. If your car was a 350 turbo with a 3.08 gear I would point you toward a little smaller cam. Your heads will better realize their potential with .500 lift and more duration if your gearing handles it which it should.
Rule of thumb, your bottom number of the operating range of the cam you want at least 200 RPM below the convertor stall. If your car was a 350 turbo with a 3.08 gear I would point you toward a little smaller cam. Your heads will better realize their potential with .500 lift and more duration if your gearing handles it which it should.
Last edited by 63mako; Mar 1, 2012 at 01:01 AM.
