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Old 04-04-2013, 01:32 PM
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engine size 350 or 327?

i just bought a engine from a guy who claim it was off a 69 impala 305. the block number comes back as 307, 327 or 350. the front pad suffix code says FB which means 327. and the casting number for the cylinders says 307 or 350. could somebody help me find what engine this is?
block number: 3956618 M5
front pad: V0131FB
cylinder: 3986339






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Old 04-04-2013, 03:00 PM
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3956618 '68-'69 302, 327, 350
FB '69 327 with Powerglide, 235 hp, 2 bbl carb
339 '68-'79 307, 350....1.72"/1.50" valve sizes....76cc chambers. These heads will be fine for transporting grandma back and forth to Bingo, but won't work well in a performance setting.
With the large chambers, I would estimate your combination as it sits is about 8.0:1 static compression ratio, so don't make the mistake of sliding a hot rod cam into the motor to try and make horsepower. It won't work. You'll end up with an even worse weak-suck operation than you have now. Looking on the bright side, slide a Crane H-248-2 cam into the motor and you will have a nice little daily driver motor that will run on cat piss regular gas and produce excellent low rpm torque for those brisk stoplight getaways.

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Old 04-04-2013, 05:06 PM
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X2 with Tech.

.........or or buy a set of 6-6.25 rods and grab a set of smaller chamber heads, get the crank shot peened and the rotating assembly balanced and you have high a revving mouse.

In case you weren't aware, you can put in the longer rods with NO machining with the 327 crank - rod to stroke ratio is outstanding with the 3.25 stroke crank!

Comes down to what you're after.
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Old 04-04-2013, 05:16 PM
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I'm hoping just to use the car as a weekend car to cruise in nothing to crazy! Can I expect it to be a decent cruiser how it sits now
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Old 04-04-2013, 05:20 PM
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Originally Posted by coradjes View Post
i just bought a engine from a guy who claim it was off a 69 impala 305. the block number comes back as 307, 327 or 350. the front pad suffix code says FB which means 327. and the casting number for the cylinders says 307 or 350. could somebody help me find what engine this is?
block number: 3956618 M5
front pad: V0131FB
cylinder: 3986339





The important number in all this is the block casting number from the bellhousing flange, it is 3956618. Yikes, this is a heavy duty, 4 inch bore block used for high performance 302, 327, and 350 engines. Of the stamps on the front the important one is the V0131FB, this tells you the engine was assembled at Flint on January 31st, the FB says it is used to assemble a moderate output 327 of 235 horses with a two speed powerglide in 1969. It is not unusual to find heavy duty blocks in this era used to build grocery getters. Chevy was most dillegent in not using a stardard block for high performance or heavy duty use. But they often used HP/HD blocks in lower power or lower duty applications. A reason why Chevy small blocks seemed so bullet proof back in the late 50's, 60's into the early 70's as many, if not most, were built for uses well under their ultimate strength limit.

The heads are 3986339's which are an open chamber 74 cc head used on 307's and 350's of moderate power. These would be appropriate for this engine's assembly code but are the wrong year, this tells you at least the heads have been replaced.

This will be a 2 bolt main block as that's the way 327's came. A 302 or 350 built on this block could be 2 or 4 bolt mains. That aside; this is a good block to build on if it hasn't been previously molested. Unfortunatly, between all the over stamped ID's and the later heads, this engine's probably came through a major rebuilder's shop at some point in its life.

Bogie

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Old 04-04-2013, 05:31 PM
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I'm hoping just to use the car as a weekend car to cruise in nothing to crazy! Can I expect it to be a decent cruiser how it sits now
Yes, of course, just don't expect to win any grand prix's with it.
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Old 04-04-2013, 06:30 PM
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1972 350 truck engine
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Old 04-04-2013, 06:58 PM
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Yes, of course, just don't expect to win any grand prix's with it.
would a holley 4160 carb be good in it? what intake would you recommend for that holley and this engine?
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Old 04-04-2013, 08:34 PM
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would a holley 4160 carb be good in it? what intake would you recommend for that holley and this engine?
get a nice dual plane aluminum intake and the 4160. my first engine made 300hp to the wheels using these parts. it was a bored 60 over 350 with a moderate cam. the carb was 500cfm. brakes worked fine too.
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Old 04-04-2013, 11:48 PM
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Have you ever tried to work on a Holley ? Or are you looking for "WOW" factor ? 1st choice if you MUST have a square bore carb is an Edelbroch/AFB 600. Will last forever with no problems. definitely a Dual plane manifold. The best thing is what GM put on them, a Q-Jet. Those heads are small valve 2 barrel heads, better for Low End Torque, not high end horsepower.
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Old 04-05-2013, 12:00 AM
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Have you ever tried to work on a Holley ? Or are you looking for "WOW" factor ? 1st choice if you MUST have a square bore carb is an Edelbroch/AFB 600. Will last forever with no problems. definitely a Dual plane manifold. The best thing is what GM put on them, a Q-Jet. Those heads are small valve 2 barrel heads, better for Low End Torque, not high end horsepower.
I actually have a holley carb from a 305 that works great so I want to put that carb on this 327 just looking for a good intake to go along with it
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Old 04-05-2013, 01:41 AM
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I stand "Corrected". It IS a 1969 full size chevy 327 2 barrel engine with 1972(nov 10 1971) 307-350 small valve heads. I guess the Holley will be ok as long as it is a vacuum secondary. I agree, a short duration /higher lift cam
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Old 04-05-2013, 12:54 PM
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I actually have a holley carb from a 305 that works great so I want to put that carb on this 327 just looking for a good intake to go along with it
About the best street intake out there for a moderate street engine is the Edlebrock Performer series. If you intend to keep the cam and compression close to stock for this engine the standard Performer is a good choice that favors bottom end torque development but keeps a decent top end. Where you're pushing it a little say with the 300 horse 327 cam or a little hotter set up, then the Performer RPM is a good choice, it gives up a little bottom end torque for a lot of top end rush. If this is a street cruiser stay with the models that use the exhaust heat crossover as this keeps the fuel well vaporized at low street RPMs when the mixture flow within the intake is slow which allow the fuel to form droplets large enough to drop out of the flow. This messes up the mixture ratio while putting too much raw fuel into the engine that doesn’t get burnt instead washes the top end lube off the pistons, rings and cylinder walls substantially increasing wear of these parts. This is less of a concern with modern high swirl heads like the Vortecs as they induce a lot of in-cylinder agitation that these older heads just can't and don't. So the new designs of heads work much better with a cold intake of these air gap types than do old heads in terms of fuel efficiency and reduced internal wear from separated mixture.

I like the Holley for the average guy as it is easier to tune or should I say harder to miss-tune. It's quite a simple (but effective) design compared to the Edlebrock-Carter or the Q-Jet. All of them are good carbs but the Carter and Q-Jets have a number of subtlies that make them very easy to screw up if you don't understand them and come at them with near infinite patience.

Bogie
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