How much hp will your 305 small block have if you had a holley throttle body and edelbrock intake and extreme volocity air intake system and 327 heads and hooker headers?

Answer 1

you could put a blower on a 305 and a 350 with 10 to 1 compression w 2.02 valves and a stock quadrajet carb willhumiliate it sorry i went through 6000. wasted on my 1977 camaro lt w/ 305. the motor is nothing but a boat anchor. if you want to have real power order a crate 350 with a stroker kit the 305 just wont cut it i had heads cam pistons steel crank headers and a holley blower with nitrous if i got over 340 hp it was sad with all the goodies, and my friends stock 350/350 chevelle would burn me every time. so i gor so fed up i built a 427 and started running mid 10.s

To answer the question, your engine would probably not see much, if any, increase over stock hp. 305's had 58cc chamber heads with small valves. This kept the compression up, and improved the low speed air velocity for good low-end torque. The 327's had mostly 64 cc heads, which would lower your compression ratio, and bigger valves, which would improve high speed breathing at the expense of the previously mentioned low-end torque. Also, depending on the cam, you could have a problem with valve to block interference since a 305 piston is a lot smaller than a 327 piston.

305's don't respond to the same performance enhancements as a 350. You can increase the compression with better pistons, change to aftermarket heads and cam, and get the engine up over 300 hp, but the block just isn't made for any more than that.