[LarryV]

I am in the process of buildig a 406. I've got a good rotating assembly(scat crank, oliver rods, wiesco pistons)and now I am trying to find the right camshaft. I have AFR 195 64cc heads which gives me about 9.9 compression. The car is 3200# with a 4.10 rear end and TH-350. It is not a daily driver and goes to the track about 5 times a year. I am thinking about a solid like a 110921 crane but am really open to suggestions.
Thanks.......

[racin69z]

I have used that cam before, and it is a great street strip cam. You could use it with more compression than you have and still be ok on pump gas. But at 10:1 it will be real safe and should run well.

I used it in a 11.5:1 377 with dart pro 1 200 cc runner heads. I ran 110 race fuel at the track and 93 octane on the street. In my 3300# 69 camaro with a 4000 stall and 4.56 gears it ran 7.70's in the 1/8 mile.

Good luck

[68rs406]

what are the specs on that cam?

[mr. Wrrooom]

Cam specs:
.050 244/252
adv. 280/288
lca 106*
lift .518/.536
Crane recomends 10.5 to 12.0 compression and 3000+ stall.

I use this cam in my 355, with 10.4 static compession (castiron heads).
It has very little power under 3000 rpm(then it starts pulling) and I think there should be more.I will go for higher comp when i rebuild it. That should help up a bit.
(unless I go for nitrous.then I will cange the cam)


IMO a nice cam with lovely idle roughness [img]graemlins/thumbsup.gif[/img]

If I was building a 406 I´d go for slightly more duration, if the rest of the parts are up for the job, but thats me.

[ 08-17-2003, 11:23 AM: Message edited by: mr. Wrrooom!! ]

[LarryV]

My other choice is an Isky Z-35 solid
288/288 .525/.525 @.50 254/254 108 LCA. This would give me a 7.46 DCR 0 adv. and 7.72 with 4 advance. Can you think of some others that might work well?

[68rs406]

both cams dont seem bad, but i would go with the isky grind or something like it. especially with those heads, there is no reason to run a dual pattern cam, imo., since afr has a real strong exhaust port. also with a 195 head and a 406, don't be worried about losing bottom end with a little duration, they make plenty of torque to begin with. so something around .250 at .050, maybe slightly less with the low compression, but not much, and whatever lift you feel cofortable with, would be my reccomendation (although i avoid recomending cams for people at all cost, since it's a very personal choice thing, imo.) those heads flow well to .600 if i'm not mistaken, and 400's like to breath. sounds like a good pump gas combo to me, should run real well [img]graemlins/thumbsup.gif[/img]

[stingr69]

Crane also sells that same cam as the F-280-2 with a wider lobe separation @112°. It was marketed as one of the Crane "Commander" cams about 20 years ago.

Does Isky publish seat-to seat timing numbers? I did not find any for the Crane cams to use for the DCR calculator.

-Mark.

[68rs406]

my cams an isky, so i have a sheet full of specs on it. heres the valve events for the z-35; first all at .020, intake open 36 btdc, closed 72 abdc. exhaust open 72 bbdc, closed 36 atdc. and if you need events at .050; intake open 19 btdc, closed 55 abdc. exhaust open 55 bbdc, closed 19 atdc.
actually its close to my roller, with a bit more overlap at .050 . it would be a pretty choppy idle for sure. i still think its close, but you may want just a scoche less duration for the compression you want to run. a good cam if you were more like 10.5:1, imo. which makes me also ask, are you sure about your compression? if the block is zero decked, you must be running a dished piston. be SURE of compression before you get your cam. also, i personally would stay at around a 108 lsa, unless you are going to run nitrous in the future a fair amount. i personally would maybe look at slightly less duration, with similar lift and lsa to the isky grind. but i have no doubt the z-35 would be a great cam in that motor. it just really comes down to what you want. anyway, just my opinion, hope it helps [img]graemlins/thumbsup.gif[/img]

[LarryV]

The block is decked to .004 and the pistons have a -20cc dish. What I'd really like is cam with 240's duration and .540 lift but can't seem to find any like that. Will I have to go to a custom grind?

[68rs406]

i wouldn't be afraid of going with a custom grind, if thats what it takes to get what you want. also, dont forget about 1.6 rockers, you can find a cam with what you want along the line of duration, and maybe achieve the lift your shooting for with an increased rocker ratio. thats actually what i did. you could also try giving isky a call and seeing what they reccomend, they may be able to point you to an off the shelf cam, or confirm you should look into a custom grind. i talked to them when picking my cam, and they were more than happy to help answer my questions, plus they are very knowledgeable, not some flunky working the tech line. i really feel you can't go wrong with isky, i'm sure happy with my solid roller from them. good luck [img]graemlins/thumbsup.gif[/img]

[JUNK YARD DOG]

comp 294s comp 306s elgin e 1090 a 256/264 dur 537 557 lift solid cam from three to 66oo this cam will do the job. 406 flat tops 64cc sportman heads elgin cam vitor juinor intake runs 6.96s to 7.20 depending on track conditons and temp 67 nova

[racin69z]

The thing with flat tappet cams is the only way to get more lift is to go with more duration as well. Most of the shelf grinds are about as wild as you would want in something that sees street time.

I think the most aggressive shelf grinds are the comp XE series. I have never used one, and would much rather use a crane because that's what I have had good luck with. But, if you want the most lift per duration I think comp has it.

Have fun

[LarryV]

Ok..I have one more question: the whole split pattern cam against the same pattern. What I have heard is that a split pattern..more exhaust than intake...makes up for a bad exhaust port in the head...and maybe gives you more upper rpm's. What are some more of the advantages/disadvantages of a split pattern design?

[68rs406]

a split pattern cam does indeed help a weak exhaust port, which your afr heads certainly don't have. they also can help a car with an overly restrictive exhaust. with a good head, and an exhaust with headers and reasonable pipes, a split pattern cam is not needed, imo. smokey yunick discusses them in one of his books, and basically says unless you have a restrictive head (exhaust port) or exhaust, they are unneeded. i obviously go along with smokey on this. also, a set of 1.6 rockers will achieve more lift, on any cam. they do in fact increase effective duration of the cam, but it's not a huge amount. definately not a cure all for a short lift cam, but it can be very helpful in tailoring the cam to what you want.