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Old 08-03-2010, 06:53 PM
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Calling 347 experts

My winter project this year is going to be a 347 that I already purchased. I need some help with some information


1). I know the 347 will be held back with stock heads, and I have a seperate pair of ported stockers. I've read that there's not much benefit from the ported ones, but I'm not going to be building a horsepower monster, it's mainly just for a fun muscle cruiser I'd like to eventually work towards.

2) Will 24 pound injectors be sufficient for the 347 (assuming I use the ported heads)? How about the stock fuel pump?

3) If I do decide to get heads, it will be a gt40 variant to save money. Which one would best suit my application, and will I need bigger injectors than the 24s, and stock fuel pump?

4) The guy I bought the stroker kit and misc. parts from says there's a "flow tube" I can buy to fit in the MAF that he gave me that is calibrated for 36 lbs (or whatever is around that size).

5) I currently have an E303 with new pushrods and lifters. I also have the lunati #51014 cam. The specs for it are

•Advertised Duration (Int/Exh): 284/292
•Duration @ .050 (Int/Exh): 218/226
•Gross Valve Lift (Int/Exh): .500/.510
•LSA/ICL: 112/108
•Valve Lash (Int/Exh): Hyd/Hyd

The appear similar, a little different. I've been told I'll get more power out of the lunati cam, but I love the sound of the E303 and for my ultimate appearance of the car, would rather have the E303. Anyway, since the specs are so simliar, would I run into any problems using the same lifters and pushrods if I were to use the lunati?



Thanks for the help, I know a lot of my answers depend on each other.

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Old 08-10-2010, 11:59 PM
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1)347 love big heads, but a set of properly ports one will work some what, we ran a set of ported 1980 model head, totally junk and the car ran 12.40's

2)i always fan a carb, but i am in the injection scene to, i would run at least a set 30 pound injectors and upgrade the fuel pump to the 225 unit or 255

3)best cheap , stock heads are the gt40p heads

4) you maf must be calibrated to your injectors

5) depends if the cams are regular hydraulic or a hydro roller

I did a 347 in my stang and i will say , that by far they are some mean little **** power making motors, the love bigger heads like a set of arf 185 , i used a set of 200 intake runner on mine, in comparison stock e7 are 130 cc and the gt40p i think are 160 range, if you have the money spend it on some bigger heads, 302 parts makes 302 power
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Old 08-11-2010, 04:32 AM
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I like the GT40P heads. They are relatively inexpensive though they do require some 'playing' with as far as port matching plus are a pain to change plugs and need a good header design that to do that.

The E303 camshaft is a nice compromise camshaft which I'm currently running in my '31s 5.0. While I'm using the OEM roller lifters and push rods, am using the Crane 1.7 roller rockers as well as Crane valve springs that will accommodate the additional .030 lift (.498 w/1.6 vs .528 w/1.7). I don't recall their open/close specs. As far as sound - with the Flowmasters, a nice sound and a great sounding lumpy idle at ~600rpm. I really sounds like a lot more camshaft. Performance wise - so far, great, but I still don't have enough time or miles on the engine or car for an all out run

I have used Lunati camshafts, but before the became a Holley owned company. That was in a warm 351W. It was a very nice camshaft then - now, who knows.

Carb vs FI. I prefer a carb for what I'm doing right now for my ease of tuning. A FI system, if properly set up will perform as well or in most cases better, but it's the 'great unknown' for lots of folks.

Dave W
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