Cam for a 300 six

danno · Post by **danno** » Fri Sep 02, 2011 4:41 pm

I know this is mostly v-8 on here but I been to the other six cyclinder sites and all I get is a bunch of smart A__ answers, so I'll ask here and maybe someone on here has done this.Has anyone but a bigger cam in there 300 six and if so what kind did you use. I have a 300 six with a offenhauser intake with a 390 cfm holly carb,headers,mallory dist and coil engine has been bored 30 over and manual trans with granny gear. I don't do much with the truck other then drive it to car shows and drive to your local sock hops.I was wanting to have a somewhat aggressive idle but not real aggressive. Please help I have looked and read about cams till I'm total lost and don't have any clue what to get and where to get it. Thanks

Post by **70_F100** » Fri Sep 02, 2011 6:37 pm

This thread has some good info: http://www.fordification.com/forum/view ... =3&t=60382

danno · Post by **danno** » Sat Sep 03, 2011 5:49 pm

Thanks, I read all about it , has some good info in it.I sure wish he was done with it and had a video of the way its sounds..

gregamorton · Post by **gregamorton** » Sat Sep 03, 2011 7:21 pm

there is a 300 with a comp 268 cam on youtube and it sounds pretty good! Ill see if I can find it.

gregamorton · Post by **gregamorton** » Sat Sep 03, 2011 7:22 pm

http://www.youtube.com/watch?v=2xgYd2u79NU&feature=fvst

nevrenufhp · Post by **nevrenufhp** » Sat Sep 03, 2011 8:23 pm

gregamorton wrote:http://www.youtube.com/watch?v=2xgYd2u79NU&feature=fvst

That's my nephew's with the Comp 268.
Here's mine with a regrind, also referred as an RV2.
http://www.youtube.com/user/nevrenufhp# ... pEK7oT0p2c
Here's another of it with no mufflers to exaggerate the idle sounds.
http://www.youtube.com/user/nevrenufhp# ... H5iE7RCgHI
It may be a choppy idle, but it's certainly easy to live with. The power band at low rpm wasnt lost as a lot of others say. I got my cam for the sole purpose of the choppy idle, and it cost me $135 with the lifters. Didnt change anything else, but the rocker arms were already replaced with ones from a chebby 292.
I daily drive it, and has 2.75 rear gears.

j41385 · Post by **j41385** » Sat Sep 03, 2011 8:30 pm

gregamorton wrote:http://www.youtube.com/watch?v=2xgYd2u79NU&feature=fvst

LOL yep thats my truck, and nevrenuf is my uncle. Small world that you found that,

danno · Post by **danno** » Sun Sep 04, 2011 3:26 pm

Were did he get the cam from and does he have the part # on the 268 comp cam,Thanks for all the help,they sound great

nevrenufhp · Post by **nevrenufhp** » Sun Sep 04, 2011 7:57 pm

http://www.summitracing.com/parts/CCA-66-248-4/
That's just the cam, if you want a cam and lifters, just add a CL in front of the -66-248-4
Trust me, it will make a nice gain in power over the whole range, and you'll be glad you got it. A choppy idling six makes car guys do a double take.

It's important to get a good set of pipes so it sounds right. The green 72 has dual 2.25" from the header back with Flowmasters. Mine has dual 2" that dumps out after a pair of glasspacks.

gregamorton · Post by **gregamorton** » Sun Sep 04, 2011 9:09 pm

I always thought that running dual 2.25s off of the FI manifolds or headers with 2 turbo mufflers on each side would make a six sound like a v8. I think it would make the exhaust deep and take away the raspeness of the six on the top end.

nevrenufhp · Post by **nevrenufhp** » Sun Sep 04, 2011 9:22 pm

Yep, that does make a difference, and that's just the point I was trying to make. The green truck with the Comp 268 sounds the best, as far as I'm concerned.

danno · Post by **danno** » Mon Sep 05, 2011 6:25 pm

Ok,I plan out getting the comp 268 cam and lifters,I have a few more question I hope can be answered.1) I have the chevy 250 rockers on it right now do I need to go back to the stock 300 rockers or can I leave the chevy one on.2)I also have a holly 390 cfm carb do I need to rejet that carb or go back to stock setting,I have #40 jets in it now it had #50 when I got it.3)Do I need to replace the valve springs or can I use the stock one,head was all redone about 7000 miles ago.4) what did you set the timing at when you put the new cam in... I think thats about it. Thanks for all your help this is one great SITE compared to a few of the others that I tried to get some info from.....

nevrenufhp · Post by **nevrenufhp** » Mon Sep 05, 2011 11:36 pm

1, you can leave the GM rockers on, but it runs the risk of coil bind. A quick web search will show you haw to check it once you get it all together. I used my GM rockers, and it was nowhere near binding, plus gave me .518 lift.

2, Leave it as is, and adjust later when you dial in the timing. May not have to do any jetting at all.

3, you technically should use what the cam says to use. Since these dont rev that high, and yours has new-ish springs, you would probably be ok. Not that I'm telling you what to do. Things can go wrong.

4, I guessed where the timing was until I got it running. I run around 15* initial, and 42* total.
I notice on FTE and ferdsix, they encourage guys to go conservative. I'm almost 40, and usually go with as big of a cam as I can get away with. In my theory, the ports on these are so small, it takes more time to fill up, so a little more duration will certainly help. That, and a long stroke wont hurt lower rpm as bad as it would on something like a 302. I even put a Comp 268 in my dad's 77 Dodge van with a 318.

danno · Post by **danno** » Tue Sep 06, 2011 1:27 pm

Thanks Again

danno · Post by **danno** » Wed Sep 21, 2011 6:14 pm

got the cam and all done and it sure does sound GREAT. Thanks for all that helped

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