Hey guys, this is deno again. Some of you know about the plug problems I have with my 355. I bought two 650 Mighty Demon Blower Carburetors. If I change the heads to Dart pro 1, would 200cc 202/ 160's. 72 cc chambers be OK. If I changed the cam, what lift and duration would be good? The car would be street driven. The blower is a 671 L/F. 10 LBS AT 5,000 rpm. Thanks guys deno---

A larger chamber is always preferred on a blown engine rather than more static comp. Id put 2.05 valves in tho. Cam needs to be blower specific to combat blow thru frm all the positive pressure.Thats why extra fuel is needed to get the a/f correct as a lot of it goes out the exhaust.

I think we need a little more info. You said change to 72cc Dart pro 1's, but What are we changing from? 200cc heads are usually considered large for a 350, but with the blower you won't see the loss of bottom end like you would N/A. What max RPM are you shooting for?

Cams suggestions are tough, because it depends on what the onwer/driver likes, the use of the car, weight, tranny, gears, etc...

A cam that is perfect for me, might not be right for you or your combination.

I agree with Smoke too, might as well stick 2.05's in the heads, it doesn't cost any more.

Royce

LilSmoke,

I'm trying to understand your statement. Are you just trying to say that you'd rather have lower compression ratio, or are you saying that a Supercharged engine requires a larger combustion chamber?

High, this is deno. LilSmoke,camaroman, and Tech@BG. You all had had great inputs. I will go with the 2.05's .I was told that I should use 72cc chambers on the heads. The heads on the engine now are from a 1968 camaro, 302/327 202 intake /160 exaust. 60cc chamber.I know that I need a blower cam. I have a B&M turbo 400. Richmond 3:91's. I think I should get rid of the iron heads, and I think that they are part of my problem. Before I do all that I want to check for cam lobe wear. I will start with changing the carbs. I have the new Mighty Demon Blower Carburetors now. Hey LilSmoke, I just want to run this on the street, on pump gas. Would this lower my compression on 72cc's? Thanks guys deno----

With 60cc heads, you wouold need a fairly large dish to get blower friendly compression. Stepping up to the 72cc heds should really help matters a lot. Have you figured what your compression is right now? The larger chambers and aluminum will help keep you away from detonation. The new heads should also make a LOT more power.

Royce

Hey camaroman, I think it is a total ot 14and 1/2 to 1 with the blower.

The darts are good heads, but have you thought about AFR? They make a 74cc chamber 195cc runner head that would help you even more. The AFR's are usually around $150 more a set than the pro 1's, but they come fully CNC ported and will perform much better. Here are some prices for the two heads.


Dart pro 1 200: it looks like you will be spending around $1200 on a set of these.
http://www.jegs.com/webapp/wcs/stor...ategoryId=13735


AFR 195cc CNC ported $1325
http://www.jegs.com/webapp/wcs/stor...ategoryId=26569

Here you can compare the flow numbers of the dart 200cc heads and the AFR 190's. The 190's flow about the same as the 195's they just dont make the 190s any more. It looked like the 200 pro 1's and iron eagles flow about the same according to the dart website, so I think the iron eagle 200 numbers on the site below will give a good representation of the pro 1 200's. these heads were all flowed on the same bench under the exact same condtions. Keep in mind that the AFR heads have a 10cc smaller intake runner when comparing the flow. Also take a good look at the mid lift numbers, these say more than the peak. Look at the exhaust numbers also. On a supercharged motor a good exhaust port means alot more than a NA motor.


AFR 195cc heads: scroll down to the 190s
http://chevyhiperformance.com/techa...598/index5.html

Dart 200cc heads:
http://chevyhiperformance.com/techa...598/index6.html

Adam

Hey Adam, the AFR. heads look good. I would go with L98's though. I like the angle plugs. They don't get in your way of the headers. I installed Dart pro 1 heads on my 1961 vette. I had problems with the guide plates. the push-rods would not line up straight with the rockers. I had to buy adjustable guide plates, and grind them down to line everything up straight. Thanks for the info Adam, firestone. deno---