Good cam size for stock 318 bottom on boost

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bigtommy

bigtommy

old school power
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I got a 318 Im turboing. Stock 75 318 bottom end. 360 j heads(might get them milled down?) 4bbl aluminum intake. 750 quickfuel blow through carb. Looking at a .528 lift comp cam. Anyone see a problem with my setup? Going for a 11.5 at the 1/4 mile. It's in a 67 four door valiant btw
 
CRN-699631 or CRN-699641 would be good choices for a turbo small block.



 
You may want to consider beefing up the bottom if you are going to boost it....
 
True and always a good idea, but If he's only shooting for 11.5's it isn't going to see much boost or stress. YOu can go 11.50's with under 500hp.
 
I'm staying with a flat tappet cam I think or what all do I have to change to run that roller tappet cam.
 
Very true! A lot is in chassis, weight, converter stall if it applies as well as gear and tire size.

We could use a bit more info on the cars set up!
 
It's a 67 valiant signt. Four door. Weights 3160 with me. 8.25 rear with 4.10 gears. Tire setup don't have yet so guys give me your input on tire and wheels. I have a 325.50.15 BFG drag radial on the rear. Stall I don't have either yet. Was looking at a 4000 stall? To big going to be running a 727 3 speed auto with a manual valve body.
 
Here is the cams your guys told me but the flat tappet one I want right? CRN-694571
But love the rpm range on this one CCA-20-228-4 and it's cheaper then the first one. Or is that too big a .546 lift of whatever it was.? I'm asking all these questions because j don't know about boost and building motors. All I want is a faster then 11.5 car on boost

My list is -
Stock bottom 318.
.528 or a good size cam(flat tappet because cheaper)
Milled down 360 j heads. With springs that are my the lift size.
750 cfm double pumper blow through Quick Fuel carb.
Weiand single plane intake.
Proform 1.6 roller rockers.
46mm percision Wastegate.
Borg warner or something 67-70mm turbo.
Arp head studs with felpro head gaskets.
Running a orange box with a two post ballast resistor.
3200-4000 stall. Whatever you guys think is best.
Late model Dakota manifolds 1993 the year they were bigger.
727 with manual valve body.
Hurst quarter stick shifter.
50mm bov.
Intercooler. Not sure on size yet.
Think that's all for motor setup I think. Hope the info helps.
 
id look for something with a wider lsa. i have been reading on the turbo forms that cams with an lsa of 112 and higher are better suited for forced induction. roccodart440's first cam would be perfect and when i get around to a paxton thats what ill be using. the only other thing is that with the wide lsa and boost you'll need realy low compression.
 
bigtommy said:
Here is the cams your guys told me but the flat tappet one I want right? CRN-694571
But love the rpm range on this one CCA-20-228-4 and it's cheaper then the first one.
Click to expand...

Out of those 2 the 2nd one is a better choice.

buckshotbishop said:
id look for something with a wider lsa. i have been reading on the turbo forms that cams with an lsa of 112 and higher are better suited for forced induction. roccodart440's first cam would be perfect and when i get around to a paxton thats what ill be using.
Click to expand...

yep /\/\/\

Since you want a flat tappet here are 2 good choices.

CRO-31321

CRN-691191
 
TE=roccodart440;1970346666]Out of those 2 the 2nd one is a better choice.



yep /\/\/\

Since you want a flat tappet here are 2 good choices.

CRO-31321

CRN-691191[/QUOTE]

what's the difference between mechanical and hydraulic flat tappet cam. The two I picked are hydraulic. the two you Picked are mechanical.
 
bigtommy said:
TE=roccodart440;1970346666]
Since you want a flat tappet here are 2 good choices.

CRO-31321

CRN-691191
Click to expand...

what's the difference between mechanical and hydraulic flat tappet cam. The two I picked are hydraulic. the two you Picked are mechanical.[/QUOTE]


They are totally different grind specs than the ones you posted. I don't see the point in running a hyd cam.

RustyRatRod said:
Summit 6900.
Click to expand...

That would do it and go 11.50's no prob and would purr like a kitten!
 
G'day mate, i've been runnning a similar combo for nearly 3 years now.
318, stock bottom end, cast pistons, stock rods, stock crank, stock bolts etc
360 heads no milling, Felpro gaskets, ARP head studs
Victor single plane
360 cast exhaust manifolds, 2" piping into Y into T4 flange
MasterPower 70mm Turbo .96 exhuast housing
MSD 6530 ignition
Lunati flat tappet hydro cam 220@50in 226@50ex 112<)
http://www.lunatipower.com/Product.aspx?id=1544&gid=287

Rebuilt 727 with Transgo stage 2 shift kit
Standard 360 stall converter

9" with 3.5:1 gears 275/60 15 MT ET streets

First time at track:
14PSI 12.1 @ 119mph
17PSI 12.0 @ 122mph
20PSI 11.9 @ 126mph

Standard stall converter was not big enough and i could not take off with any boost, so all my 60 foot times were 2.0. I have just put a 3500rpm converter in it and will go out again. I think on a hail mary pass it should run a high 10 if it doesnt grenade first!

Car weighs approx 3500lb+

Cam idles like a baby, plenty of vacuum. Makes max power @ 5500rpm

Any more questions please ask.
 
The Comp cam you chose is a poor choice for forced induction. You need to read upon the subject. Any forced induction engine responds much better to a wide LSA such as a 114.
 
Okay the only problem the bigger 112 or 114 cam I can find is .461 lift. I'd like a .528 or something or that too big oh a cam for turbo. Because I know too big of a cam I'll be slower then stock lol. And what's a good rpm range camshaft and stall so I can launch is with boost off the line.
 
The stock bottom will live as mentioned. You need to dump those 4:10's and get a 2.76 or a 2.94 gear. Turbos like a load and those gears will make it happen. I bet the 2Times would be better off with 3.0 gears in his 9" ford also!
 
2times said:
G'day mate, i've been runnning a similar combo for nearly 3 years now.
318, stock bottom end, cast pistons, stock rods, stock crank, stock bolts etc
360 heads no milling, Felpro gaskets, ARP head studs
Victor single plane
360 cast exhaust manifolds, 2" piping into Y into T4 flange
MasterPower 70mm Turbo .96 exhuast housing
MSD 6530 ignition
Lunati flat tappet hydro cam 220@50in 226@50ex 112<)
http://www.lunatipower.com/Product.aspx?id=1544&gid=287

Rebuilt 727 with Transgo stage 2 shift kit
Standard 360 stall converter

9" with 3.5:1 gears 275/60 15 MT ET streets

First time at track:
14PSI 12.1 @ 119mph
17PSI 12.0 @ 122mph
20PSI 11.9 @ 126mph

Standard stall converter was not big enough and i could not take off with any boost, so all my 60 foot times were 2.0. I have just put a 3500rpm converter in it and will go out again. I think on a hail mary pass it should run a high 10 if it doesnt grenade first!

Car weighs approx 3500lb+

Cam idles like a baby, plenty of vacuum. Makes max power @ 5500rpm

Any more questions please ask.
Click to expand...

What fuel? Intercooler? Meth injection?
 
bigtommy said:
Okay the only problem the bigger 112 or 114 cam I can find is .461 lift. I'd like a .528 or something or that too big oh a cam for turbo. Because I know too big of a cam I'll be slower then stock lol. And what's a good rpm range camshaft and stall so I can launch is with boost off the line.
Click to expand...

this one has a 114 lsa and with the 1.6 ratio rocker arms you have listed you'll be at .537 on the intake and .563 on the exhaust

http://www.summitracing.com/parts/crn-694561/overview/make/dodge

i dont know how lift affects turbo engines though.

id also give a call to Oregon cams http://www.oregoncamshaft.com/

they know there stuf
 
Buckshot, is that rpm range for that cam good? 3000 seems alittle high to start power. Or is that why I get a 3500 stall or higher?
 
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