mass air,injectores and throttle body???

[D's 91 stang gt]

Building a 347 and was wondering about the top end what size mass air injectors and throttle body would you guys suggest?? also what set of heads would you think work best afr's or eldelbrock??

 

[gcwh02]

depends on if its your street car or an all out drag car. But in the mind of a street/strip car. A set of afr 185's are an ideal 347 head. A custom cam, or you can go with some of the off the shelf comp cams are good or a TFS stage 2. Either a holley intake/TFS track/rpmII would work well. A 75mmTB, 255 lph fuel pump, 30 lb injectors, 80mm MAF. Your gonna need roller rockers, pushrods, and lifters with that too.

 

[bullitstang1313]

It all depends on what kind of power levels you want to go with and how it will be driven. Knowing the Head/Cam/Intake info will also play a huge role in what size injectors, MAF, and TB you will need.

 

[jrichker]

Injector HP ratings: divide flow rating by.5 and multiply the result by the number of injectors. This uses a 100% duty cycle. These ratings are for naturally aspirated engines.

Example:
19/.5 = 38, 38 x 8 = 304 HP
24/.5 = 48, 48 x 8 = 384 HP
30/.5 = 60, 60 x 8 = 480 HP

The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.

304 HP x .85 = 258 HP
385 HP x .85 = 326 HP
480 HP x .85 = 408 HP

Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.

See http://users.erols.com/srweiss/ to get the calculators used in these examples.