throttle body change on stock motor. how big can i go??

[Foxfan88]

hey is it even worth it to grab a bigger TB for a stock motor??
Keep in mind, i am building a motor thats going to have heads and cam etc.... So if its not exactly great with my stocker, it will work well with the new motor.... so it wont be money wasted

So will a bigger TB create slower throttle response??

 

[jrichker]

Stock engine = 65 MM TB. Not much HP will be gained without a change to an improved intake manifold.

Stay away from the 70 MM and larger unless you are going to a stroker engine or Forced Induction.

 

[aleborjas]

i have a 306 with 185's, typhoon intake stage 2 ported, XE274HR cam, 1 5/8 lt's, 2 1/2 pipes and i alreay bought the 70TB is not instaled i have right now stock one, can my 70TB work on my engine or i am goin to lose power what can i do?

 

[IntenseBlue]

i have a 306 with 185's, typhoon intake stage 2 ported, XE274HR cam, 1 5/8 lt's, 2 1/2 pipes and i alreay bought the 70TB is not instaled i have right now stock one, can my 70TB work on my engine or i am goin to lose power what can i do?

70mm should be perfect for yours.

As for the original post, would a stock H/C engine benefit from a 65mm throttle body?

 

[aleborjas]

can i run 30pounds with my engine or stock ones?
i have stock ones and 30 pounds with 75mm maff
what should i run?

 

[IntenseBlue]

can i run 30pounds with my engine or stock ones?
i have stock ones and 30 pounds with 75mm maff
what should i run?

With AFR185s, I'd run 30s before I'd run 19s.

 

[Michael Yount]

The bottleneck to flow on the stock engine is the lower intake manifold. If you want to get some bang for you buck right now, go ahead and buy your intake and put it on. That will make a difference in peak power. Putting the larger t/b on won't make a significant difference since the bottleneck to flow is downstream of it. And a 65mm t/b is sufficient for just about any streetable naturally aspirated 302.