Hey guys, I'm looking into get a new throttlebody for my 305 tpi. what is the biggest I can get for it. I see 52 and 58 mm. what are the advantages and disadvantages of either size?

 

you don't need one for a 305. But if you want one for looks I would recomend the Holley 52mm. I got one off this website called partsamerica.com for a pretty good price and they had one in stock this was 3 years ago tho.

 

Dont change it on the 305. Its not worth it.

 

You do not need a new throttle body unless your engine NEEDS the extra air (if you have put in a new intake, heads, cam, then your motor is demanding more air, in which case your stock throttle body is the bottleneck). If you put a throttle body on a motor that doesnt need it, you are just sucking in extra air that you can't even use.

The stock one flows fine for a stock/mild motor.

 

WHATS FUNNY IS EVERYONE THINKS THE BIGGER THE THROTTLE BODY THE BETTER A GOOD 52 MM..IS CAPABLE OF RUNNING A 383 WITH TPI..ALL TRICKED OUT..USING THE 58 ON THE SAME MOTOR THERE IS TINY DIFFERENCE..I TRIED BOTH THE 52 ACTUALLU PULLS HARDER IN THE LOW RANGE..IF U DONT BELEIVE IT THATS OK..

 

well with that info.. maybe you should look at the TB for your car. like i mean get one that fits your power. if you get a 58 mm and its to big it could actually hurt the air intake by suckin into much air not making it smoth etc... maybe some spec data would help etc.