I have 327 that I would like to run a weiand 6--71 supercharger on with around 6 psi. I would have around 8:1 compression wiht the new pistons. My main question is what kind of cam should i use for it. I have a comp cams 294* solid lifter cam with a 110 lobe seperation and .525 lift with 1.5 lifters would this work or would it not ,if not what kind of cam should i use then. This is not going to be a daily driver it is going to be a weekend warrior. My goal for this engine is around 650hp.

 

Ideally you should shoot for a cam around 112* to 114* of LSA.

 

Guys who run chargers please tell me what you think of them. What cam should i use with my charger. THe charger I plan on getting is a weiand 6-71 blower. What are some other things I need to do to the engine for the blower.

 

What heads? Need to pick them first

 

pro top line 200cc heads

 

AFR 210's or 220's depeding on how wild you want to go. On the cam you'll want a 113-116 lsa to trap as much boost as possible. With 8:1 compression you can run alot more than 6 psi boost, you'll probably be safe with about 10 on 93 octane gas with proper ignition and boost retard (MSD 6BTM is nice). What's the rpm range you're looking for and what will the motor be used for (drag, street/strip)?

 

Cam manufacturers offer a complete line of supercharger cams. Specs are usually a little different than a N/A cam becuase they have a wider Lobe Separation Angle and significantly more exhaust duration than intake.

CHoose a cam that is designed for a blower and is designed to work in the power range you plan to run in. Remember, even with a blower it's always much better to err on the side of a smaller cam than you think you need than to overcam and make it a dog.

For a roots blower like that, assuming street use with the occasional trip to the dragstrip I'd say stick with a blower cam that's got about 220* @ .050 intake duration. This will make good power up to about 6000 RPMs- which should work well with the torque-monster roots blower.

No need to go with some wicked-high stall speed converter or super steep rear gears. Roots blower engines make BIG torque throughout the rev range, but the blower gets inefficient at higher RPMs. So don't try to build an 8000 RPM roots blower motor. Not easy to do, and not necessary to spin it that high to make big power.

 

The car is going to be used 80% on the strip and 20% on the street. I am going try and stay within the 5500 rpm power range. What is a logical horsepower number with a roots blower. The goal for this car is up in the 10's or better in the 1/4 mile. would a set of dart pro 1 aluminum 215cc heads work.

 

How many cubes do you plan on running? If you want 400+ I would reccomend a Dart Litte M block since it's much stronger than a stock one. If it's using a 350 based block and under say, 600hp you will be fine with the stock block, but anything above that I would get an aftermarket block. If you were running a 6-71 blown 400 you could make 650hp, with a 383 600hp. Those Dart Pro 1 heads are very nice, they'll make lots of power. With the power level's you're looking for (to get a 3400lb car into the 10's) have you thought about using 18* heads?

 

I am going to use a aftermarket 4 bolt block bored .030 over. I want try and hit the 650hp range which would be enough for me to handle. No I haven't thought of 18* heads, would they make a difference. I might go a step bigger than a 6-71 and jump to a 8-71. Would that get a 355 to 650hp.

 

18* heads make a big difference, they flow like mad... You could probably see 600hp from them on a 350 (a wild one though). A 6-71 would be more than enough for 650hp. I'll run some numbers on engine analyzer and see what kind of difference you're looking at.

 

OK, I ran some numbers. With a 6-71, 18* ported heads, NX284 cam (not the cam you'll want, but the closest I could find) and 8:1 compression with the 6-71 driven 1:1 peak hp was 697 @ 6500 and peak tq was 569 @ 5500. This is with about 10 psi of boost. With fully ported AFR 220's I got 673hp and 560tq with that above combo (8-9psi boost) and with an 8-71 I came up with 719hp and 590tq with a peak of 12 psi boost.

 

:hail: :hail: :hail: :hail: :hail: that awesome thanks. I found a set of 18* heads they are trickflows are they good. I really don't want to go over 700hp so I will stick with a 6-71 blower with twin 600cfm hollys double pumpers. One more question what kind of fuel pump would i use to feed this monster.

 

You'll need an electric in tank pump, or an electric in line pump. The mechanical ones just won't cut it to deliver the fuel you need. BTW, I did those sims with dual 750 carbs, so you're numbers will be slightly lower. The 6-71 will be plenty since you want to stay under 700 ponies. Trick flow makes good heads, not as good as Dart or AFR, but if you're getting a deal on them I say pick 'em up, you'll make 650hp easy with them. If you want some more sims, email me or something, I can get you graphs as well.

 

hey can you run another car on your analyzer. This one is my daily driver. It has an edelbrock performer air gap intake, and a edelbrock 600cfm carb with around 8.5-1 with 76 chamber heads. I want to add a set of pro lightning 180cc heads with 64cc chambers,a comp cam 270* magnum cam with hooker headers 1 5/8th" headers along with comp cam magnum rockers and a holley 650cfm double pumper carb. If you can I would appreciate it.

 

You do realize that 18* heads require a special intake manifold (or in your case base plate)

 

Yeah i realize I would need a special base for the blower.

 

on my 89 IROC 5.7 I'm running a ZZ-9 cam, 1'3/4 headers, 52mm, accel intake manifold, large tubes, ported plenum, currently stock heads

Thinking about an ATI P-1SC

ZZ-9 should be ok to run with right? Original plans didn't include FI, but now thinking about it...like the cam, would like to keep it...

opinions?

 

What program are you using to calculate these numbers?

 

I used Engine Analyzer, I think version 3.0