Hey, I am looking for some pointers here. I am going to replace my 305 with a 327 and would like to keep the computer and TBI in tact. What will I need to do to make it work ?

 

from my understanding the 2 major problems are your accesoryies and the intake.Also that block has a 2piece main seal which your fly wheel or the flex plate will be different.Other than that,it is a drop in.Do a search and that willhelp you out alot.You also can go to the engine swap board for more help.

 

Thanks, Heres a little more info. I have #882 heads with acc. holes and I figured that I will use a holley TBI adapter plate on the intake. Will I have a problem with sensors etc. Also do you think I can use a Crane cams Blueprint camshaft 327/ 350 hp. I appreciate all the advise I can get!

 

I am not sure because some of the old blocks have the same places for senors and some don't.Some body might need to chime in on this since I am not that familar with the older blocks.But you will need to change the flex plate/flywheel beuse the the teeth I think,one is a 153 count and the other is a 158 count.The reason being that is a 2 piece seal and the newer are a 1 piece seal.You should be able to put the senors where thet are suposed to go,you might have to tap and thread where needed.Go to engine swap board and check out the stickeys.But this swap has been done with good results.

 

Tuning, tuning, tuning. If that is a copy of the old 327 350 HP cam, then it's pretty lumpy. There are better cams out there that will make the same power and have a smoother idle, check out comps extreme energy series. As for sensors, yeah they'll all work. As far as I know all blocks have the drain holes near the oil pan that the knock sensor screws into, and you can get adapters to put the coolant sensor in the heads no matter what size hole it's tapped to. Like I said you'll need to get proficient with prom tuning before diving into a project like this, best to start with your stock motor and get the hang of things before the new motor goes in. Mail order chips will be useless.

 

This swap is useless unless you can tune it properly...

 

Checkout our resident TBI tuning guru.......RBob's ride. A 1st gen FIrebird with a 327 running a Isky 280 HL cam.....224° @ .050, .465 lift, 108° LSA

Do a search on his name to get more info.......

DM

 

I run the L82 cam in my 305. It is 224/224*, .450/.461 lift(.480/.492 w/ 1.6:1 rockers), 114.5* lobe center, runs very well with tuned TBI.

 

So if I watch my cam size then I should be fine . Turn Key ? O will I still need to have the computer re- programmed. Just to tweek your brain what would need to be done to bypass all and just run carb. How much difference in fuel economy is there between carb and TBI . I really appreciate all of you guys input.

 

You will still need to have the ECM tuned to the engine, your dumping 200+ more HP into the ca....slapping on the EFI the way it sits and expecting it to perform like the old engine did wont work very well, you can pay a boat load of money to someone to tune it for ya or DIY and save.

Carb vs EFI, there are pros and cons to both carb is simplier but EFI once tuned wont require any more fiddling with unless you mod it more, especially if you change elevations. If ya run carb you'll need to do something to get fuel to the carb either monkey with the computer and allow it to pump fuel or go the mechanical route. the rest is pretty basic just toss out (ebay) the whole EFI system.

 

Flywheel - you can use the older 327 flywheel but will need a different starter (older starter to match older block) which will be bigger, weigh more. I have a 1969 350 block and did this - it works fine, just larger heavier starter (which ends up closer to headers if you install).

If you have a complete 327 block (327 heads, 327 crank - all 327 inside) then it may be worth while to see about selling it - complete 327's are hard to come by anymore depending on your area, and the old school rodders often pay top dollar for one so they can give there 1960's/1970's whatever a complete original restore with original powertrain. You may could get top dollar on a sell and have cash in hand for a nice 350 and extra left over for headers & other goodies - just a thought.

 

As for fuel milage, I gained 3 MPG on the highway, and 5 mpg around town. This was going from a carter 750 to a 454 TB.

Like mentioned earlier, you won't make it out of the driveway without DIY tuning. It just won't happen, learn how to burn chips or go carb.

 

Ok, So How much tuning is involved if I Keep the 327 as bone stock as possible ? How do I get started on DIY tuning ! What will I need ? Thanks for all of the input guys !