Throttle body size

[wreck]

According to Wallace racing , I would need 320 hp to get to 120mph with a 2400lb car .

[Paul H]

Sounds about right and the 50's will flow about that so the question is what mph will your car do in the 1/4 on a good day ?

[wreck]

Again thats why I was looking for other answers , and will only know when I can run it either on a dyno or the track without a boot and air filters .
I doubt there would be two many air cooled street engines producing 340hp on pump unleaded , I need more comp for the cam but don't want to remove any more from the heads . It is what it is .

I read about the build on a Scandinavian racer building a type 4 drag engine . 2.8 lt I think over 60mm carbs . I think it was around 320 hp . A local drag racer had his car on a dyno recently . Pauter 3 lt with his own ITB's not sure on the size but would be over 50mm , very high compression ,roller cam on methanol . it made about 320hp at the wheels .

[Paul H]

You asked whether the throttles on your engine are too small based on a slight pressure drop . You need more information
either 1/4 mile mph with the engine properly tuned or some comparative dyno numbers with different size throttles
You can actually get an app on a phone that will tell you the 1/4 mile mph just find a straight bit of road

[wreck]

yup , totally agree with needing data from the track or dyno . and if it is because the intake is too small the hassle in boring out the throttle bodies to fit bigger plates and welding up manifolds to port out to suit the bigger throttle plates to gain only a little hp , It's not a race car after all . I was just wondering if some else had gone down this route before and worked out how much dropping from 100 to 96kpa at peak HP made on power if any .

I need to try without the boot and can't do that on the road . removing the belt is a pain because it is a serpentine with a rear engine brace to remove first .