Cam choice need help

[65-coupe]

I am about to order my alum head and everything to go with. I need help deciding which cam. I am torn between the 264/264, 264/274 or the 274/274. I think I will going to go with the 110 lob with any of them. This will be going in a 200 stock bottom end. CI alum head and intake, 2100 carb(4100 hopefully in the future). 1.65 roller tip or full roller rockers, T-5 trans with a 3.40 gear. This is a steer car but I want it to have a choppy sound and the best performance possible while keeping verifiability. I plan on using 93 octane gas, Any help would be great.

 

[xctasy]

I am about to order my alum head and everything to go with. I need help deciding which cam. I am torn between the 264/264, 264/274 or the 274/274. I think I will going to go with the 110 lob with any of them. This will be going in a 200 stock bottom end. CI alum head and intake, 2100 carb(4100 hopefully in the future). 1.65 roller tip or full roller rockers, T-5 trans with a 3.40 gear. This is a steer car but I want it to have a choppy sound and the best performance possible while keeping verifiability. I plan on using 93 octane gas, Any help would be great.

Default choice is always 264/264 Clay Smith, it won't give you any problems.

The Classic Inlines head is a real hardcore performance item, not a nice little small port street tootler. As such, its very easy to over cam the combination, so the basic cam is the right one. Don't over cam a CI head, it won't like it.

I'd look at this first. The tipping point is that your better off going to the full on 480 CFM 4100 4-bbl set up. Don't do it twice, drink the full strength Cider first

See http://www.classicinlines.com/Dyno2.asp, and copy it to the letter.

A cams apparent idle "chop" or "lope" is based more on having a non port on port carburation system serving the six cylinders. The smoothest idle is always with port fuel injection and simultaneous multiple carb systems like Triple 2-barrel Webers. Then triple SU's or Stromberg Zeniths. Centre squirter, vac sec and mech sec 4-bbls are very good for idle. 1-bbls are roughest, 2-bbls slightly better, and 3 x 1-bbls as cammy as a 1-bbl.

The CI intake runners and port volumes are best with more multiple barrels. A 2-bbl is a bare minimum, and really, a 4 bbl is the minimum that should be considered, because 2-bbl carbs are very suseptable to poor idle when the cam durations are increased.

 

[64falconsix]

If it's street power you are looking for I would go with the 264 110. Especially with the.1.6 rockers. It still has a little lope to it. To me the lope is secondary to making power, been there done that twice, loved the sound but was unhappy with low end performance. Also calculate your compression ratio, I would want to be right at 9.5 to1. also check out mraleys build on classic inlines dyno room page. Over 200 ft #s of torque at the tires is pretty snappy using the 264/110

 

[65-coupe]

Thanks for the replies. I am going with a 2100 carb because I have it already, and do not want to buy another one yet. I got it from a friend. But I might go with the 4100 or a demon carb later. So I guess I will go with the 264/264 110 cam. I can not wait to have it all running with the T-5. Anybody else I still would like to hear your opinion.

Thanks Brian

 

[64falconsix]

just my opinion i would save the 274 for a street 250 or a 200 I was going to race, the 250 would better handle the loss at the bottom end on the street because of the cubes and longer stroke .here is a vid clip of the C.I. aluminum head with the clay smith 274 cam with stock ratio rockers. http://youtu.be/Kd5Wo4R4zXM , the split duration 264/274is better suited for a cast iron head with a 2 bbl or tri-power. similar to the specs of the clay smith 264/ 110 cam is the 260 comp ( rpm range 1000 to 5000 ) in my 64 with tri-power which may be just slightly less agressive the the clay smith but very close, here is a clip . http://www.youtube.com/watch?v=Lc-1Y7AL ... aXVoxlZ1Sg , again calculate your compression ratio if you plan to run 93 octane you can get away with 9.5 to 1 compression.maybe a touch more, best to figure your dynamic and static compression. Read this article on dynamic and static compression , http://www.classicinlines.com/CompressionR.asp , . also the rpm range for the 264 is 1500 to 5200 and the 274 1800 to 5700 rpm,I rarley have to turn mine above 4,800 rpm unless at the track and shift at 5,200 there. Mraleys engine with the 264/110 dyno peak torque and horsepower both at 4850 rpm.... at 227 max torque and 211 hp at the tires which is perfect for an inline 6 street beast. Dyno sheet 2a , http://www.classicinlines.com/dynoroom.asp , if you still can't decide give mike at C.I. a call or shoot him an email he probabley knows better than anyone what might work best for your application. Good luck and post your progress.

EDIT; one more thing to add for proper exhaust pipe size and maximum performance on the street here is a good chart to go by. http://www.magnaflow.com/07techtips/faq/question10.asp

 

[65-coupe]

I talked to mike last night and I am going with the 264/264 110 cam and the 1.6 roller tipped rockers.

 

[ray6966]

any recent news on your build?