cam for 632 big duke
 

Just got my cam specs, 288in 294ex @.50 833in 845ex with a 114 lobe separation with big duke 18deg heads and 13.5-1 compression and two dominators will this cam make good power. Thanks

Re: cam for 632 big duke
 

gas or alky ?

If alky here is a good article to read
http://www.apdracing.com/news.cfm?ID=60

gas

Re: cam for 632 big duke
 

That was an interesting read!!!! Thanks for putting up the link to the site.
I had just ordered a new cam from LSM and actually started wondering why the new cam I had ordered was very very similar to the cam I had except for more lobe sep. and more exhaust duration. Now I know.

Thanks hammertime, I'm calling the cam company tomorrow and sending them that link. I have the pb1802. I want to get this thing right the first time if possible. Thanks again

not a problem guys,
John Kyle @ apd is a big reason you see these bigger cubic inch 11/12/14/18 degree motors running on alky. He is a very smart guy that trys a lot of things on the dyno. If you guys are in the cam market he has his own custom grinds he would sell. If not and you'd like some input he is always a helpfull guy.

camshaft methanol and gasoline
 

thanks Hammertime! good info and good read. wonder if smaller inch big blocks would respond the same way, like 396 and 427 BBC's? :?:

Well the cam is set up for a blower application due to 114 lobe seperation, but should work good with the compression ratio you are working with. Pending gas or alky carb selection willbe a big issue. You will want to avoid creating static pressure within the motor to maximize hp & Torque. And you don't what to choke the engine with to small of a carb. Looks like you are going to need a lot of air and fuel por that bad boy.

If you go alky I suggest at a minimum a mechanical fuel injection system with a bird catcher

The cam company read the article and they are changing things up now. I'm glad hammertime posted that link I think it saved us a lot of headache.

When you get the specs of it let us know, I know what cams APD used when he switched them around in the big duke motors. What I find amazing that APD does is this, a buddy has a 582 conv headed motor they went to a lowere lift cam something like 770/740 and knocked some compression out 13:1 ands till made 1086 on the dyno. A lot of HP was made in the cam choice for that motor. Its all about the motor shop finding the right thing on the dyno then putting it to the test on the track. Anymore to many companies dont want to do this and find the extra little things that make good HP. Just my 2 cents :lol:

new cam specs: 288in 304ex @.50 833in 777ex 116 lobe separation

Got my new cam today from LSM. My old cam was a lunati grind. Specs were IN lift:.810 Ex lift.778 In dur. @ .050 -290 Ex dur@ .050-304
with a 114 lobe separation.

The new cam from LSM is IN lift- .877 EX lift . 854 IN dur @ .050- 288 EX dur. @ .050- 306 with a 115 lobe separation.

When I asked about the cam being so close to the other they told me that they opened up the exhaust duration and lobe separation because of the alcohol fuel and head combination I had. This is a 622 bbc with 14 degree heads on alcohol.

Just thought I would share that.

I just received my cam kit today and we upgraded to the 904 lifters. I can't wait to get this thing going but now I have to send the heads off to get a full port job. I'm not looking forward to spending the money on them but it will be worth it because I'm sending them to RFD. I figured you get what you pay for so do it right the first time.