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Slant six cam question
https://slantsix.org/forum/viewtopic.php?t=63473		 Page 1 of 1
Author:  slantsix64 [ Thu Apr 04, 2019 3:05 pm ]
Post subject:  Slant six cam question
If I'm making a custom grind for my slant six, should I have more duration on the intake side and lift?versus the exhaust side, I'm running split manifolds into a y pipe. No header. Thanks let me know what you guys think.
Author:  Dart270 [ Fri Apr 05, 2019 2:01 am ]
Post subject:  Re: Slant six cam question
Yes, generally the 225 likes more intake duration than exhaust. It appears that 4-8 deg @ 0.050" more on the int is what works.

Lou
Author:  slantsix64 [ Fri Apr 05, 2019 11:33 am ]
Post subject:  Re: Slant six cam question
Thanks Lou going to be putting a custom 268 .470 lift intake 264 .460 lift exhaust in my four speed
Author:  Dart270 [ Fri Apr 05, 2019 1:02 pm ]
Post subject:  Re: Slant six cam question
Sounds great. I would recommend 9:1 compression for that kind of cam. Can you list the duration at 0.050"? What are the other engine parameters (bigger valves, induction...)?

Lou
Author:  slantsix64 [ Sat Apr 06, 2019 3:37 pm ]
Post subject:  Re: Slant six cam question
Quote:
Sounds great. I would recommend 9:1 compression for that kind of cam. Can you list the duration at 0.050"? What are the other engine parameters (bigger valves, induction...)?

Lou
Yeah sure 230 236 @ 50, yes my motor is at 9:1 I'm currently running an Avs 500 cfm carb, the valves are stock but I have another head that I'm going to port out a bit and install some ford intake valves. I currently have the Howard's 256 .473 but she runs out of steam at 5k, I believe I under cammed my motor to my liking. I originally had 264 clifford 474 lift camshaft. I lost some top end for sure swapping almost 10 durations less. I mean the car is fast but I know with this new camshaft I'll be happy were I'm at. Hopefully lol. :mrgreen:
Author:  Dart270 [ Sun Apr 07, 2019 6:18 am ]
Post subject:  Re: Slant six cam question
For better power overall and a maybe bit less low end (and a bit rougher idle), set your lobe separation angle (LSA) to 106 deg. I do this for all my perf cams. Degree the cam at 100 installed centreline - best power overall AND better lower end than what most manufacturers recommend (104 or 108 or whatever).

A big valve head with even mild bowl porting will make a big difference over a stock head. Lots more top end, and no sacrifice in low end.

Lou
Author:  slantsix64 [ Sun Apr 07, 2019 10:38 pm ]
Post subject:  Re: Slant six cam question
Quote:
For better power overall and a maybe bit less low end (and a bit rougher idle), set your lobe separation angle (LSA) to 106 deg. I do this for all my perf cams. Degree the cam at 100 installed centreline - best power overall AND better lower end than what most manufacturers recommend (104 or 108 or whatever).

A big valve head with even mild bowl porting will make a big difference over a stock head. Lots more top end, and no sacrifice in low end.

Lou
more power rougher idle! looks like 106LSA it is! sending the camshaft out tomo to get regrinded.
So Lou what do you think about the Howards 256 .473 lift camshaft i have? i feel like this is a RV Truck camshaft vs performance.
Author:  Dart270 [ Mon Apr 08, 2019 2:57 am ]
Post subject:  Re: Slant six cam question
It is hard to know how it (Howards Cam) will fare, performance-wise, until you get a good flowing head on the motor. Yes, I would say it is on the mild side and the LSA is large so bottom end and smoothness will be emphasized. I just bought one of those and will run it (sometime this summer) in an engine intended for supercharging. It will have a high flowing head on it. Will let you know how it feels.

Lou
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