327/350 swap 1966 c-20

[Dragsterjr]

Hey I'm new here and I need to know if someone can explain to me the steps of swapping a 350 into a truck with an original 327.what needs to change?will it just bolt in and use the stock wiring? Any help would be appriciated
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[redneck6]

welcome to the spot and it is a dead nuts swap . every thing should be same . only thing i can think may be diffrent is mounting boss on the block may be diffrent . but all in all could swap heads and all over to and just find a 350 short block may save ya some pennys .

[Dragsterjr]

Cool thank you for the advice
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[hugger6933]

Welcome to the site and that swap should be as easy as remove and replace It should all chage unless you use a 350 from 1986 or newer, it has a different flywheel bolt pattern but other than that you good to go

[markeb01]

Welcome to the forum. Post some pics when you have a chance.

[Captainfab]

They are both small block Chevy's, so most everything will interchange on the exterior of the engine. The one exception is the '86 and later engines as hugger6933 said. If it were me, I would swap the short water pump and all the front accessory drive onto the 350, but I would run the HEI if the 350 has one. This is assuming the 327 still has the short water pump as it should.

[63burban4x4]

I'm in the process of replacing a 283 with a 350. (I imagine that that your 327 will be basicly the same as the 283) I have the 2 motors side by side on engine stands. As cap'n says, good idea to use the pulleys, etc from the old on the new, (though from the pics here, most guys don't do that, lots of the trucks here seem to have the later stuff, alternator on the pass side,that's how my 350 was)
I'll start by saying my 283 was removed, complete from a 64 chevy full size car, so there could be diffs between it and the original truck setup that I'm not aware of...my 63 truck was originally a 283, though. What I have found so far was that I had to modify the lower PS bracket to clear the 350's larger harmonic balancer. Also, when I put it together, the bottom crankshaft pulleys were just ever so slightly out of line with the PS & alt pulleys, I suppose due to the harmonic balancer. I cut the center from another set of pulleys, making a flat plate, and spaced my 283 pulleys out from the harmonic balancer with it. Seems like now they line up well.
I also changed the 350's "ramhorn" exhaust manifolds to the early style, in order to keep the 64 alternator mounting the same, the 283 driver's side manifold has a mounting flange on the front of it. I was concerned that the 283 manifolds had smaller ports, but the guys here say they are the same (thanks, guys!) That's as far as I have gotten, but I think the front of the motor is set up well now. I'm planning to use a VintageAir A/C, so I don't know if all the pulley setups will remain the same or not....a bridge yet to cross!

Still to come, intake manifold. I'd like to use a quadrajet carb, but I need a manifold with the oil breather/filler neck, since I'm working on installing PCV valve and baffles in the stock 283 "script" valve covers. I've got my heart set on using those. (my 283 had a "road breather" at the back of the manifold) I'd rather have them with PCV hoses than another style of valve covers.
I hope to use the HEI from the 350, fingers crossed that it clears the firewall, seems like some guys have problems with that. I know I will NOT try to install the distributor with the motor in the truck.

[padresag]

Originally Posted by 63burban4x4

I'm in the process of replacing a 283 with a 350. (I imagine that that your 327 will be basicly the same as the 283) I have the 2 motors side by side on engine stands. As cap'n says, good idea to use the pulleys, etc from the old on the new, (though from the pics here, most guys don't do that, lots of the trucks here seem to have the later stuff, alternator on the pass side,that's how my 350 was)
I'll start by saying my 283 was removed, complete from a 64 chevy full size car, so there could be diffs between it and the original truck setup that I'm not aware of...my 63 truck was originally a 283, though. What I have found so far was that I had to modify the lower PS bracket to clear the 350's larger harmonic balancer. Also, when I put it together, the bottom crankshaft pulleys were just ever so slightly out of line with the PS & alt pulleys, I suppose due to the harmonic balancer. I cut the center from another set of pulleys, making a flat plate, and spaced my 283 pulleys out from the harmonic balancer with it. Seems like now they line up well.
I also changed the 350's "ramhorn" exhaust manifolds to the early style, in order to keep the 64 alternator mounting the same, the 283 driver's side manifold has a mounting flange on the front of it. I was concerned that the 283 manifolds had smaller ports, but the guys here say they are the same (thanks, guys!) That's as far as I have gotten, but I think the front of the motor is set up well now. I'm planning to use a VintageAir A/C, so I don't know if all the pulley setups will remain the same or not....a bridge yet to cross!

Still to come, intake manifold. I'd like to use a quadrajet carb, but I need a manifold with the oil breather/filler neck, since I'm working on installing PCV valve and baffles in the stock 283 "script" valve covers. I've got my heart set on using those. (my 283 had a "road breather" at the back of the manifold) I'd rather have them with PCV hoses than another style of valve covers.
I hope to use the HEI from the 350, fingers crossed that it clears the firewall, seems like some guys have problems with that. I know I will NOT try to install the distributor with the motor in the truck.

the main reason for using the 283 short w/pump and pulleys is for the relationship from fan to shroud. so that it sits in the same place, you can put the 283 crank pulley (harmonic balancer) 0n the 350 so that it will all line up.
you will find that the hei will go in easier with the cap off of it.
ron
I got my trim from Jamie thks

[63burban4x4]

I have everything lined up beautifully. Guess I just don't understand why the 350 has so much larger harmonic balancer compared to the 283, but I wasn't going to take a chance. The 283 balancer is TINY compared to the 350. This worked out fine, for me, though, thanks.