I put together this spreadsheet for everyone's reference comparing square surface area across throttle body bores, cfm airflow capability, and what type of horsepower your particular throttle body should support. These numbers could be used for maf sizing and cfm (not hp for maf as that has alot to do with voltage of the meter as well). Hope all enjoy. Mathematical calculations were made and then I used a base throttle body that had been measured for actual flow and applied to other sizes to get approximate cfm and hp calculations. Chart is sized from smallest square surface area to largest.

 

Some good info , i should be good with the BBK 61 mm truck TB....

 

I think i have one small correction. The truck TB's should be twin 50's not 51's. Would only make a small diff. I will try and correct and repost those.

 

I thought the stock '87+ 5.0L Mustang TB was 60mm. I believe my '86 Lincoln LSC 5.0L H.O. (first year for SEFI) has a 59mm or something weird like that.............but I could be wrong.


Here's a calculator that I have used before...........not as "user friendly" as your chart, but still fun to play with!
http://www.revtronix.com/techinfo/ca...rottlebody.php

 

I think you are right...87 to 93 is 60mm, pre 86 is 58mm...and I think some of the non performance applications were as low as 55mm. '93 Cobra was 65 and all SN95's were 60mm. The purpose was really to compare sizes vs. airflow and hp...not so much vehicles. But I will make this correction on applications. I also think 5.8 trucks and Lightnings were twin 50's. I will repost with the changes and add the 58mm.

 

5.8 truck uses the same TB as the 5.0 truck and I'm pretty sure they're 52mm but I'll have to check that. Either way your chart clearly demonstrates how rediculously oversized these things are and also how completely unnecessary an even larger throttlebody is on one of these motors.
The 5.8 Lightning uses a totally different intake.. the GT40.. which has a single TB and I don't know what size the TB is but I'd be surprised if was more than 65mm.

 

According to this document...the 5.8 GT40 is single 65MM TB and 5.8's are the same as truck 5.0, twin 50mm.

 

Here are the latest revisions to applications and additional throttle bodies.

 

While the stock intakes could support theoretical horse power, I would like to see some dyno charts to know the rpm capabilities of the stock intakes.

 

This speaks to throttle bodies and not intakes, but a intake technical comparo would be a great addition to this analysis on throttle bodies. Who wants to take the lead...lol?