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Old 03-21-2008, 08:24 PM
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327 Buildup

I have a 67' Camaro with the original 327. It's a .030 over block with a stock crank and rods. I'm about to rebuild it with the exception of the rotating assembly. I've chosen AFR 180cc heads with 65cc combustion chambers 2.02'' intake 1.6'' exhaust, 1.5:1 roller rockers, an Edelbrock Air Gap intake, a Comp Cams Magnum hydraulic flat tappet cam 236/236 @ .05'' duration and .49''/.49'' lift with 1.5:1 rockers LSA 110 degrees. I've used a compression calculator to estimate the compression at about 10.25:1 assuming a 0 deck height and flat top pistons. The camaro has a Saginaw 4-speed with a 10 bolt rear. I was hoping for something a little bit peaky that is still street-able. This is not a daily driver but it's not a track car either. I can't decide on a carb however. I'm thinking about a street avenger 670 (vacuum secondaries) or a 700 double pumper (mechanical secondaries). Any suggestions about carb size would be helpful. In fact, any feedback about this combination at all would be appreciated. Not many people are building 327's anymore and it's hard to find any information.

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Old 03-21-2008, 10:09 PM
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I would stay in the 600-650 cfm range with a vacuum secondary for the street.

In the back of mine mind I've always wanted to build a 327. I've got 3 blocks in the garage, but I keep building 400s...can't give up the inches.
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Old 03-22-2008, 12:55 PM
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i ran a 670 avenger on the last 327 i built it worked very well but the idle transfer and accelerator pump needed lots of tuning those carbs are not designed to run a camshaft with a lot of duration
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Old 03-22-2008, 07:41 PM
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I would most likely go with a 600 DP or a 650 DP Holley with the 4 speed. What kind of gears in the rear or did I miss that area?
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Old 03-22-2008, 09:03 PM
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Not sure which gears

I'm not sure how to tell what gears my rear end has. I looked at the differential and I couldn't find a casting number on it. Do I have to open it up and look at the gears to tell?
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Old 03-22-2008, 09:41 PM
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Gear ratio test

I tried the gear ratio test twice and I came up with 1 and 3/4 turn each time. I'm not sure if that is bad or good. It's definitely not a posi though.
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Old 03-22-2008, 09:45 PM
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You can also remove the diff cover, turn the ring gear until you see the numbers stamped. Example 41 11. 41 ring gear teeth, 11 Pinion gear teeth, divide them and you got your answer. 41 divided by 11 = 3.73:1
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Old 03-22-2008, 10:18 PM
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I found the casting number!

The casting number on the differential is Gm 10 on one side. The other says NF 3894859. I hope this helps.
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Old 03-23-2008, 06:10 AM
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Best way to do it is get the count stamped on the ring gear. The numbers will be visible when you take the cover off the rearend. Hope you have at least 3.42's would be nice to have 3.73's or 4.10's.
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Old 06-01-2008, 10:39 AM
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327 Update

I've pulled the engine and discovered a few things. It's a two bolt main as I assumed. It has the stock forged small journal crank and forged rods. It was already bored .040" oversize so I had it bored .060" over at the machine shop. The pistons are forged Speed-Pro with four valve reliefs. I've changed the compression ratio to 9.75:1 to be more pump gas friendly. I'm thinking about a solid cam instead of hydraulic to prevent valve float at higher rpm. The block has been cleaned, bored, honed, and had fresh cam bearings put in. The decks were milled to achieve the deck height I wanted. They also put new freeze plugs in for me. To achieve a bit more lift I'm going with 1.6:1 roller rockers. Everything else is the same except the carburetor choice. I went big with a Holley 750 double pumper. I read too many articles with engines smaller than mine that used these carbs and got great results. Anyhow, I still haven't pulled the cover off of my differential to find the gears but I will be doing that some time in the future.
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Old 06-01-2008, 12:16 PM
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Draw a stripe on driveshaft and tire -rotate tire and do math.....close enough
327's are very Ratty little motors-
with low gears and 11 to 1 you could use a 780 !
Have fun !
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