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305 to 327, 91 camaro

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Old Mar 15, 2009 | 06:34 PM
  #1  
venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
305 to 327, 91 camaro

Ive got a late 60's 327 available to me, now i don't know awhole lot about these motors but can i put it into my 91 camaro? Can i use the TBI from the 305 that i got? Any info would be great.

Thanks
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Old Mar 15, 2009 | 06:48 PM
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From: Silverhill,Al
Car: 92 Camaro RS
Engine: 305 TBI
Transmission: T-5
Re: 305 to 327, 91 camaro

It should work, TBI could be tuned for a mild 327 but the TBI intake won't bolt on due to the center two intake bolts are different, biggest problem is I think early 327's did not have mounting holes in the cylinder heads, not sure about the later ones, so you would not be able to use the factory serpentine accessory belt drive. Oil dipstick is on the other side of the engine too. I would sell the 327 and buy a late 350, would be much easier.

Last edited by DartByU; Mar 15, 2009 at 06:52 PM.
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Old Mar 15, 2009 | 07:28 PM
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tony_cogliandro's Avatar
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From: sunny so cal.
Car: 1990
Engine: 305
Transmission: 700r4
Axle/Gears: stock
Re: 305 to 327, 91 camaro

a long while back someone told me that you could elongate the holes and bolt it together. like a dummy i thought he was talking about the head, who wants to screw with the head. today i was thinking about it, because i need some cheap heads to bolt my 90 tpi to and it finally dawned on me. he wasn't the fool, i was. he was not talking about the heads, he was talking about the intake manifold. take it to a shop and have them elongate the interior 4 holes on intake manifold, then it will fit at 90 degrees and you can use those to turn the hole into 90. it was so simple but i missed it completely.
i agree that he should use the modern 350 though.
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Old Mar 15, 2009 | 08:02 PM
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: 305 to 327, 91 camaro

327 heads don't have the hardened exhaust valve seats necessary for unleaded gas.
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Old Mar 15, 2009 | 10:12 PM
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327Chevy's Avatar
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Re: 305 to 327, 91 camaro

Most people do 350's. I'm doing a 327 and about to swap it into my 88 305 tbi. Don't let anyone give you a hard time on the 327 - it's a good engine. However you will be spending just as much if not more than doing the same type of work to a 350.

A few things I have learned.

1. As stated, heads of 60's vintage don't have the hardened exhaust seats. Also as stated, some don't have the front accessory mounting holes for the serpentine stuff. But if you are thinking of aftermarket or newer heads anyway, then no problem.

2. You will need a special flywheel to get the 2 piece rear main seal block (probably 168 tooth flywheel) to fit the 700r4 torque converter. One is currently on the way from summit to me. The bolt circle to mount the converter is different.

3. Depending on the year, there may be a vent draft tube connection at the block near the distributor tube. Cars now have pcv system instead of this "road breather. The block hole for the draft tube can be plugged with a freeze plug.
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Old Mar 15, 2009 | 11:01 PM
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venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
Re: 305 to 327, 91 camaro

awsome, great to hear, yea i don't plan on sticking with the heads that are on it. Cause i want to either do TBI or TPI
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Old Mar 15, 2009 | 11:42 PM
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327Chevy's Avatar
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Re: 305 to 327, 91 camaro

Just noticed you are in California. I don't know anything about the emission laws there except to be very afraid. The 327 or other old engine swaps might not make your state authorities very happy.

Suggest you look into it before proceeding.
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Old Mar 16, 2009 | 06:12 AM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You don't need to use a 168-tooth flexplate. '82-'85 3rd gen f-bodies used a 153-tooth 2-piece RMS flexplate.

With later heads, the 327 will look exactly like a '91 engine except for the dipstick. Doubt that will raise suspecion. Keep the cam reasonable and all of the emissions equipment with a proper EFI system, you won't have any problems.
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Old Mar 16, 2009 | 07:26 AM
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venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
Re: 305 to 327, 91 camaro

yea ill be moving back to washington state by the time i get the swap done.
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Old Mar 16, 2009 | 11:50 AM
  #10  
crytical point's Avatar
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From: Sanford, FL
Car: 92 RS Camaro
Engine: 305 TBI
Transmission: T5
Axle/Gears: 3.08
Re: 305 to 327, 91 camaro

OMG don't ruin the 327 with TBI heads!

Those things like to rev and TBI heads can't do that. good set of vortec heads and some mild porting will do you fine with a good after market intake and TBI adapter plate or one of the TBI manifolds.

Turbo 327 was one of my thoughts for my car but it would cast to much to build right, and thats an engine you wouldn't want to cut corners on.
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Old Mar 16, 2009 | 09:41 PM
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327Chevy's Avatar
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Re: 305 to 327, 91 camaro

five7kid, this is where I was told to use a 168 tooth flywheel and the reason I ordered one. (once I realized my original 1967 flywheel didn't have the right bolt circle for the torque converter)

https://www.thirdgen.org/forums/engi...ine-setup.html

Maybe that advice advice was for 1967 blocks only?

Venom204, what exact year is your 327?
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Old Mar 16, 2009 | 09:54 PM
  #12  
venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
Re: 305 to 327, 91 camaro

Not sure what year it is my father is getting the casting number for me
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Old Mar 17, 2009 | 08:58 PM
  #13  
venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
Re: 305 to 327, 91 camaro

Ok so i was looking up the block number and its "3970010" So it shows it as the 69-79 350 but also shows it as the 68 year 327. Can anyone shed some light on what it might be?
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Old Mar 17, 2009 | 11:00 PM
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five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
'68 & '69 327's used the large journal cranks, like the 350. The block could have been manufactured in '68. Or, it may actually be a 350. Only way to know is to check the crank.
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Old Mar 17, 2009 | 11:13 PM
  #15  
venom204's Avatar
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From: Sacramento, CA
Car: 91 Camaro RS
Engine: 305 TBI
Transmission: Auto
Axle/Gears: 2.73
Re: 305 to 327, 91 camaro

KK i dunno if it still has the crank my father in law is going to look for it, its in peices, he says the heads are there as for the pistons and the crank hes gotta look for it. Hes got an identical 350 that a guy let the water freeze in it and popped the freeze plugs but it also cracked the block need to the freeze plug
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