Dual grind or single grind cam?

[Anonymous]

Using a 78 stock log head on a 200 which one would be a better choice?
Daily driver, 9:1 comp., T-5, 3.2 rear, headers. I can get more specific if you need me to.

TIA Jim

 

[StrangeRanger]

Dual pattern cams normaly have more exhaust lift and duration to help out engines like the SBF that are somewhat restricted in that area. Since the SB6 is more limited by the intake than by the exhaust, especially if you've added a port divider and/or headers, it's not likely to get much benefit. You may want to go to Isky's web site and read the tech article on dual pattern cams. Isky doesn't much like them.

http://www.iskycams.com/techinfo_index.html

 

[Anlushac11]

Dual pattern cams normaly have more exhaust lift and duration to help out engines like the SBF that are somewhat restricted in that area. Since the SB6 is more limited by the intake than by the exhaust, especially if you've added a port divider and/or headers, it's not likely to get much benefit. You may want to go to Isky's web site and read the tech article on dual pattern cams. Isky doesn't much like them.

http://www.iskycams.com/techinfo_index.html

But what if you have a Oz head with 4bbl intake, 450cfm Holley 4bbl, pocket ported, port divider, long tube header,a nd 9.8:1CR?

 

[addo]

Mark, you use this: caminquiry@crowcams.com.au 8)

I am looking at dual patterns to flatten the response curves (yes, tradeoffs, but the tri-carbed 221 grunt will still be huge). Almost 9½ in² of throttle bore, total. Yours would be not so different...

Regards, Adam.

 

[67 Falcon]

Use the Comp Cams 260 good street cam. Russell

 

[AzCoupe]

I have spoken with four different cam manufactures, including Isky when we were at SEMA last fall. All suggested a dual pattern cam in applications using the OZ heads or Offy trips due to the increases in CFMs on the intake side. Applications with the stock log and a single carb would not see much benefit in dual patterns. I agree with 67 Falcon, the Comp 260 would be my choice for most daily driven applications.

I am currently developing a cam line suited to OZ and Offy applications, but can match any cam grind from any manufacturer. The nice thing about custom ground cams is the ability to tailor the cam to the specific application. I haven't got a firm price yet but they should be in the range of $110-120.

 

[Anonymous]

At the risk of inserting 9.5 sneaker into an occasionally big mouth, curiosity begs me to ask this question. Why wouldn't a log head benefit from a dual grind that had more lift and dur. on the intake than exhuast? :duh: And be nice, I'm just trying to learn something here so I'll be a little less ignorant in th future.

 

[AzCoupe]

Jim,

Read the link to the Tech article that StrangeRanger posted. It explains it pretty well. http://www.iskycams.com/techinfo_index.html

 

[Anonymous]

I did actually read the tech article StrangeRanger posted before my last post. I must not have understood it as well as I thought I did. I will reread and try to improve my coefficient of understanding on the subject matter. I'm really not interested in getting a terminal case of hoofinmouth disease.

 

[Anlushac11]

I have spoken with four different cam manufactures, including Isky when we were at SEMA last fall. All suggested a dual pattern cam in applications using the OZ heads or Offy trips due to the increases in CFMs on the intake side. Applications with the stock log and a single carb would not see much benefit in dual patterns. I agree with 67 Falcon, the Comp 260 would be my choice for most daily driven applications.

I am currently developing a cam line suited to OZ and Offy applications, but can match any cam grind from any manufacturer. The nice thing about custom ground cams is the ability to tailor the cam to the specific application. I haven't got a firm price yet but they should be in the range of $110-120.

Any idea when those cams might be available? Im gonna be in the market for one in next couple of months.

 

[AzCoupe]

I can order one any time and have it within five or six days. E-mail me all your specifics (how the engine is built, CR, tranny type, rear end ratio, type of driving, etc). I'll ask them what they suggest for specs, forward them to you and we can go from there.

 

[Anlushac11]

8) Cool!

I will be in touch soon.