[iwantachevelle]

I have parts every where and i am going to put them together and throw it in a beater to have some fun. Heres the combo.

350 .060 over
11-1 comp.
pocket ported camel backs 461's
ported Victor jr.
750 holley

I am going to find a light car and strip it, It will have a 4.56 gear and turbo 350 with 3000 stahl. I might throw a 100 shot on it if I decide to later. My question is about the cam. I want to run a big cam to bleed off some cylnder pressure and mabee run 92 octane. What do you guys recomend?

 

[baddbob71]

I'm no cam expert but with the gears and compression and light car I'd say a cam with about 250 @ .050 would be where you want to be. Do a seach for Pat Kelly's DCR calculator that should help narrow it down, also ask the experts like UDharold. Try the combo on desktop dyno. Make sure of your measurements like piston to deck clearance and cylinder head chamber volume etc. You can slap this thing together and cross your fingers or plan it out right and make sure it will work, the choice is up to you

 

[BB485]

[No message]

 

[BB485]

I would suggest a huge solid cam.Stud the main caps.Get a seperate fuel system for the nos run race gas in it.If its got forged pistons like trw and good rod bolts you can safely run 300 jets. I blew a crank out the bottom of the pan once with a fogger at 450jets but the rest of the motor was really low budget except for the heads.

 

[Eric68]

Originally posted by baddbob71:
I'm no cam expert but with the gears and compression and light car I'd say a cam with about 250 @ .050 would be where you want to be. Do a seach for Pat Kelly's DCR calculator that should help narrow it down, also ask the experts like UDharold. Try the combo on desktop dyno. Make sure of your measurements like piston to deck clearance and cylinder head chamber volume etc. You can slap this thing together and cross your fingers or plan it out right and make sure it will work, the choice is up to you

Exactly.

 

[Fried_Guy]

I don't know much about stall speed, but it seems to me like you'd want more than 3000 RPMs if you use a cam with 250 @ .050" on a 350.

 

[Nickel333]

The factory heads have old school combustion chambers, are iron, and will probably detonate without alot of cam. Run whatever the heck you want @ .050 but make sure you have a long duration id suggest over 300 advertised @.006 and have a good cooling system, again its not a cam recomendation but more of a suggestion you should talk over with somone who knows exactly what the hell there talking about {i dont want your detonation problems on my hands} and if its a strip only car { wich i assume because youre stripping it and such} who cares if it idles like crap. I guess what im saying is because of your old heads design you may need more cam than 250@.050 to prevent detonation. Just a thought.

 

[iwantachevelle]

Hey guys,
thanks, I am a machanic (not high perforamnce) for a living so it will assembled properly. I was thinking about that 305 cam I beleive comp makes it, something like 250 at .050 and .525 lift. Or should i be looking for a solid? Block is a 4 bolt with lightened pink rods and cast crank. Pistons are hyperurtectic?. I am going to unshroud the valves and clean up the combustion chamber also. Just want to make sure I am not using too much cam.

 

[thrasher]

With todays grinds I'd be looking for a nice solid for more torque and power.

 

[427L88]

Bigger solids tend to perform better (idle quality/low speed torque) than a big hydraulic.

COMP 284S, 292S, Lunati 401B1LUN on a 110-112 LSA, etc.

 

[Pat Kelley]

With flat top pistons (6cc), .040" quench, and 64cc heads you'll have about 10.32:1 CR. About the smallest cam for pump gas is a 280º cam (8.28 DCR), the largest that will maintain performance is around 300º (7.6 DCR). This is for a 108º LSA installed at 104º. The smaller cam will will work better with the 3000 stall.

 

[iwantachevelle]

I do not remember the number on the piston, but they are domes. I figured it out once, and it was real close to 11-1 comp, with my heads. I can't remember what i used for quench. Ok it sounds like solid may be a better choice, with what I am doing would i want a wider or closer lsa? And should I anvance the cam? how much would it increase cylinder pressure if I did, say 4 deg. adv.? What kind of power do you guys think i might get? And what rpm range? Thanks alot

 

[iwantachevelle]

All right I got the numbers on the pistons.
H618P .060
254-01-03-B
I think they are speed pro. With the 461 casting, I think its a 64 cc chamber it says 10.9 to 1. But wht do they use for quench when they figure that? How am i going to figure my compression when i figure out my quench?

 

[Pat Kelley]

Speed Pro used the factory spec for deck height and a .038" thick gasket. I just read this in their catalog. A 350 is nomally .025". 461 heads are nomially 64cc. They can vary.