75MM throttle body necessary for 351?
 

I was contemplating stepping up to the 75MM throttle body but wondered what sort of gains I could expect with it. I recall reading that 70's flow nearly 700 cfm, wouldn't that be enough for this fairly mild set-up I've got?

David

i have a 75mm on my 306 and it seems to like it ive got heads intake cam headers just about everything you can bolt on, so i would go with the larger one your car most likely flows more air than mine and mine likes the 75mm

I would Run 70MM if it is Not a Race only car the 75mm might be a bit to much. I know a few Guys that WOULD NEVER put more then 65mm on a 302/306 they Say there is not need at all for a 70mm less it is a Race only car. And I am sure that 75MM is a Bit of Over kill less you Have 430+ or so.

70mm is plenty for you.