I might be crazy

But i'm going to build up a 305, with a nice price tag.

I picked up a fully assembled, and running 305 for 50$, i didn't think it was much of a find untill i ran numbers.

The heads are the 14014416 cast heads, which have some potential. And pretty much they are the entire reason for this build, that and my bottom end is punched .30 over and stroked (340 displacement overall) .

With some minor work it could be a nice semi fuel effective motor, and still have some punch to it.

I was thinking having the heads fitted with bigger valves on the intake, (1.84 to 1.94) and just leaving the exhaust valves alone. Gasket match it to free up some flow, and depending on how much the shop charges, maybe some port/ bowl work.

Piston are going to remain the same in the motor, most of the bottom end will stay the same, a set of fresh bearings is about it. And a check over of the bottom end. Not that much can go wrong on this, its a well built bottom end and its low-revving.

The cam is a comp cams extreme energy, matching kit. Lift is .454 on each side. I forgot the duration i'll have to get the cam card out of my garage and look. I have a nice lunati cam to use but it would be a waste in this motor, it doesn't even make power till 3500 RPM, which would leave me a 2000RPM range for power, but this comp cams starts at 1700RPM, and makes decent power all the way up to 7700 RPM, which this motor will obviously never even come close too.

I've got a nice intake to use, holley aluminium, not sure of the model but it's not an emissions restricted intake, and it's got a divided plenum.

Carb is a slight issue, i do have a nice double pump mechanical secondary, but its a 780. Might be alittle to big for this motor? For a standard 305 i thin i'd be dumping to much, but it has been stroked so that helps.

As for the rest, i have headers to use but I'm considering exhaust manifold still. Depends on if i can get a good pair that won't bit my power compared to the headers i have.

And the ignition is simple, just a good old mallory super 85 series HEI, nothing too special but it'll more than do the job.

All said and done, it should run 250-300 HP and be a nice daily drive with some hot rod to it.

Well, the motors already been stroked and bored .030 over. So I'm not spending any money there, all of the parts I'm using i already have, except the manifolds, like i said if i can find a pair that offers close to same flow as the headers then I'll pick them up and get them powder-coated black and cleaned up.

About the 350 crank, i'm pretty sure if you put a 350 crank in a 305 you end up with a 305? this was a topic in another post of mine, because i was confused about a 305 being the same bore as a 350, just different stroke, and that was NOT the case, almost the exact opposite. I think the only difference in 305/350 cranks are casting numbers and they way they are balanced? and depend on the year wouldn't the rear main seal be different in the blocks?




Your right about the Q-jet carbs, but i don't have one. I do have the holley 780 ready to go, so thats why I'm using it.

Already got an above standard stall TC, 1200.

Yeah i figured as much, the motor is a 9.1 now, other than some head-gasket work, the compression is staying the same, because i'm not doing any thing further to this bottom end.

I've been doing ALLOT of reading about the 305's, mostly on hotrodders.com.

This thread is pretty useful, there's allot of information. http://www.hotrodders.com/forum/stroked ... 698-3.html

The overall goal of this build, is just making the best out of what I've got. Even if the motor pulled less than 250HP, tha'ts fine by me. I will be documenting everything about this build up, and I'll have dyno paper work to prove whatever the motor puts out.

After I'm done using it as a daily, because I'm building a nice 350 on the side, I'll end up selling it on here, considering a 305 came stock in most of our cars, I'm sure someone will be interested in a 305 with some punch and little bite on the fuel. 😀

I'll definitely keep everyone updated on this build, pat i never plan on letting or even trying to push this motor to 7000 RPM, that would be death internally, hell even 6200RPM is pushing it.I know its a low reving motor, and that's where I'm trying to make the most power. As for the 416 cast cylinder heads, the main point of building this motor is working with what I've got and budget cutting, if i can make this stroked 305 put some decent numbers to the wheels, then that means we all can! and considering almost ALL of our cars came with a 305, that's good news for us?

JBreu, I'm not 100% sure on my stall speed, i know its a standard TC for a 700R4, that's what the trans shop told me. But a 700R4 was used in a WIDE variety of applications, so my stall speed right now is kind've a mystery. Haven't drive the car in awhile either so i can't remember when it kicks in.


86Cutlass383SR, thanks for the info. that's a HUGE help, i didn't know that and I'll be making a call to comp cams and seeing whats up with the current cam i have, if all else fails I'll just have them help me pick a nice cost effective cam for this application. And I'll post up a copy of the cam card.

**edit** this is something that just came to mind, for a low revving motor making all its power in and 5200 RPM range, would i be able to make better power with a mechanical flat tap VS the hydraulic flat tap style cam the 305s came with? Because i have a cam from a 1967 L79 ( or L78 i forgot the code) 327, and the motor it came from was rated at 350HP at 5200, that's pretty decent, i know the 305 wouldn't come close to that, but I'm still wondering what the pros and cons are here.