Supercharged Heads/cam

I have a 350 Chevy, it has forged dish pistons. I have a Dyers 6v-71 blower (6 psi boost). The heads I’d like to use, because I have them, are Dart Iron eagle 72cc heads with 200cc runners. Will the 200cc runners be ok on the 350, I knkw for a pretty much stock 350 it’s too much but I’m hoping with the blower they’ll be fine. Also, what can would you recommend? As well as rockers, should I do full roller or roller tip? 1.5 or 1.6?

Thanks, Mike

 

What do you want the engine to do, get you to the local diner or go racing? What car is it in?

 

Street/strip car, but I’d like it drivable because it’s more street. It’s in a 67 Firebird with an M20 and 3:70 9” rear

 

I’d look at cams with a 114* lobe center angle and I’d run stock rockers, but I’m thrifty.

 

With all cam issues in last 15 years
50/50 on solid & Hyd ,
Run , use Hyd Roller ,
No Solid Roller un less you go with
Very Good Lifters $1,500 Plus .
No Monster Cam Needed for your combo , under .530
Pic just for reference , BDS has more
H -R then shown pic 20 years old ,
Look @ Howard web site ,


Good roller tip are oK
Same with Full Roller ,
Good Brand Quality
Not cheap under $350 bands .

 

I’d prefer to stay standard hydraulic cam, I don’t want to do a roller

 

Is this a cam and lifters that's all already been ran and when removed each lifter match to the lobe that it came off of

or running cam & lifter set already.

6 psi will work on a stock cam engine
I have done it 35 years ago ,
Cast pistons , crank , rods
But you gotta keep the engine happy
"""AFR """ not get to greedy on boost

 

M-20 trans/3.70 rear gears is a good combo.

 

I don’t have a cam yet. I’m asking if the 200cc dart heads are good for a 350 with a blower and what cam I should run. I don’t want to run a roller can, I’d prefer to stay standard hydraulic.

 

You can Break good parts all so
I melted 1,300 -1,800 pistons
Boken rod's
Blocks
1,200 plus cranks

But you can also run Stock
Stock 350 & 400 Under 6,000 rpms
Up to 5 ish psi for years ,,

 

Yes Heads will work Fine!!

its 50/50 % you will LOOSE the cam !!
Its really to me 80% you will wipe cam
On any made in last 15 years to present ,
Hydraulic or solid flat tap,
Spend the money and use H-D roller
Even get a 5.7 stock Vortec block
& cam

 

Just ""recommendations ""if you're new to this which it sounds like you kind of are ,,,No offense !!!
I'm not afraid to run a 80s Vortec on my lawnmower tractor ! That would be extreme , But

 

I’m just asking if the 200cc heads will be ok and looking for a cam recommendation that’ll work well with the heads and blower. I don’t really need a lesson, lol

 

@Fifty5C-Gas
If engine tuned correct ,
You will have to learn how to speed shift real fast 1st to 2nd & maybe 3rd,
Will RPM , Quick any traction
Clutch , slip is more likely , next to look @ broken M20 ,

 

Yes Heads Fine ,,,
If you want you can install a set of
SB2 's
Those heads are Better then you Need
For what you say your wants / intend

You're gonna be heartbroken if you stick with a flat tap it or solid Cam go south more expensive to fix than use a retrofit kit first Time

 

I agree the heads are better than I need, but I have them, I don’t have to spend money on heads, they’re sitting in my garage. I prefer to use them as long as they’re not too much head for what I have and won’t hurt performance.

 

@Fifty5C-Gas
I would rather run those heads that you have then a fully set of reworked
Double hump 202's ,

Set Your springs to what ever
Cam you go with ,
And if you going to buy new rockers
Good quality Full roller or just the tips
Like Chromoly body with Roller tip

 

The heads will be fine, you can run huge ports with a blower and it won't care.

Cam with around 230 degrees duration at .050" lift is probably what you want. A little more duration on exhaust is probably a good idea. 112-114 degree lobe centers should work well for a street setup.

Turns out that camshaft selection depends mostly on what RPM you'll be running the engine, the blower doesn't really affect it much at all. so if you're aiming for 3000-6000 rpm (for example), pick a cam that works in that range. It's not as much rocket surgery as you might think.

 

@Fifty5C-Gas
You did not bring up ,as about carbs
I prefer side saddle mount ,
With what it sounds what your are doing , 350 -377 around 6 pd boost ,
2 650 cfm in line if Holley my choice
377 - 406 2 750 cfm 8- 11 boost ,
@squirrel I believe Carter's on the Nova
With the 427 , many miles across the U.S. with Pre 65 parts,
Do not know the cfms thoe thinking @ least 1,400 Combined ?
I have No experience with Edelbrock nor Carters on Blower

 

2 600cfm edelbrock carbs set up for use with a blower

“

• 2 1406 Edelbrock carburetors

• Universal Throttle head

• Square flange or Spread bore mounting pattern

• NO CHOKES

• bright shiney finish (NOT PAINTED, BLASTED OR ANY OTHER SALES PITCH YOU SEE OUT THERE)

• Mounting gaskets

• flow tested

• These carbs have a specific calibration for 2x4 super charger set up. The main jets and metering rods have been replaced with a NEW combination that we have found to be much better and more responsive that the stock combination. There is also recalibration of the primary venturi boosters that deliver your idle fuel and transition fuel mixture, making for a more responsive and crisper launch. SO take note if you are comparing other sets to these. These are no ordinary 1406's”

 

@Fifty5C-Gas
Back around 88
I had a 406 .494 IN .512 Ex
6:71 8 pob
2 650 DP
Switched to
2 750 Dp
Picked up 4 teth

 

I’m looking at this cam….
https://www.summitracing.com/parts/...G71DyW8u5XExja4rzIPo9LjFNWuU2S_IHCzvxERBalxq-

 

that cam looks like it's what you want...

 

Check those valve springs.

 

You mean if they can handle the cam?

 

See the notes relating to the Howards camshaft.

 

I saw that but I’m not using stock heads, I have dart heads with a double spring. Springs have 100psi seat pressure, hop up to .500” lift cam

 

Just make sure the springs are right for the cam, not too soft, not to stiff. That's in addition to having enough valve travel so the retainer won't hit the guide/seat, or get close to coil bind.

 

@Fifty5C-Gas
That cam You looking @ looks good also to me , & If I had to buy New Rockers
I would Experiment probably add 1:6 s

I have 1:5 & 1:6 .

I have use this under 400 cid ,
Seems To For me worked well.
H-Roller
Thoe ,
With out seeing on engine Dyno to see Results ,,
I prefer over 400 cid sb .

 

If you are buying new rockers, go with roller rockers. No reason to run 1.5 ratio if you have enough valve to piston clearance to accomodate a 1.6 ratio and springs that work with that lift. Its free HP with no downside.

I would only use a roller cam even though it costs more. Last thing you want is to spend all that money to put the engine together and be one of the guys that has a flat tappet cam wipe it out during breakin. Yes roller cams aren't perfect, but they give fewer problems. Notice that all the OEMs use them nowadays and engines are lasting a lot longer .