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I have a 427 Motor that I have had for about 30 years.... never quite found something to use it in and so it just sits. Really don't know much about these motors except what I find on Google so thought I would ask some experts. The internet says it could be worth 12-20K but that's quite a wide field. I am attaching photos to see what guys here think. Thanks in advance for your help. Jack
Last edited by JackinIdaho; Jun 2, 2026 at 05:26 PM.
Reason: adding photos
looks like a 67 351 block which can be worth about $5000 depending on condition and 66 858 high performance heads worth about $2500 depending on condition. what is stamped on the engine pad in front of the right head?
Thanks for your reply The deck has been shaved. There is also one photo I left out that shows the number 3904351 so I am going to add that now as it may be significant.
Last edited by JackinIdaho; Jun 2, 2026 at 03:21 PM.
What’s the number on the intake? It has a port in the top of the water passage so that probably makes it a 68 or later. But it also appears to have a milled plenum divider that from the factory is associated with an L88. The part number will tell what it is.
the block value would possibly depend on if it’s a 2 bolt or 4 bolt block. And depending on what it’s current bore is and condition.
You should find a date code in the middle of the passenger side of the block. near the middle freeze plug. The attached pics show the date code from my '69 2-bolt 427.
The other place to take a pic, unless you've already had the pan off...is just above the oil filter pad on the drivers side. This will help identify if that block is
a 2-bolt main or 4-bolt main block. The pic shows a 66 #942 4-bolt block that came with the very large oil fitting that the 4-bolt blocks had for an oil cooler.
Mike T - Prescott AZ
It is a 4 bolt main. It was rebuilt about 20 years ago to standard, and was decked and shaved. . Will go take a picture of this number you are pointing out to add to my post. Thanks for helping out. I am not a mechanic by any means so it's hard to know which places to look for some of these numbers. The date code indicates 1967. I added a few more pictures.
Last edited by JackinIdaho; Jun 2, 2026 at 05:46 PM.
Thanks for helping out... I am not a mechanic by any means and know little to nothing about these motors. Can you post a photo of the area where you want numbers from ? Tx
It was told to me that it was probably an L88 engine. Just not sure where else to look to confirm or debunk that.
An L-88 isn't so much in the block as it's the same block as the other '67 427 engines. That this one has 4-bolt mains may indicate it was at least a 435hp engine - the 390/400 engines used the same blocks but were only drilled for 2-bolt mains. That's not to say a block that started out as a 2-bolt can't be drilled for the 4-bolt caps. This one doesn't appear to have the threaded external oil connections that indicate an original 435 or L-88 like Vet65te showed. Because the deck has been machined and no numbers are visible is a big minus to the L-88 claim.
It's the internals that make the L-88, so: Is there a stamped part number in the end of the camshaft? Can you pull a head to see what the piston domes look like - maybe a borescope pic in a spark plug hole? Any numbers on the rods? Are the lifters mechanical or hydraulic?
As mentioned....I don't see the oil cooler port...so maybe it was a 2 bolt block converted to 4 bolt? Nothing wrong with that at all from a performance standpoint.
The rods and crank appear to have been balanced....are those 7/16" or 3/8" bolts on them? Sorta look like 3/8" but hard to tell.
The heads have been heavily hogged out in the exhaust....maybe good..maybe bad. They are early closed chamber versions. They run well and make compression at the expense of airflow. Opens typically make more power....but a lot of factors weigh in on that. Are those aluminum retainers? Definitely old school if so and I'd change them before running it just in case.
A look at the pistons would help a lot too. How much dome is on them? A peak at the bottom side of them can often give clues also
The intake has been worked on and welded...so typically not worth too much. It's a great intake, but they don't cost much and are pretty easy to find.
Looks like a typical old school hot rod build looking at the small details. Probably a good strong engine...but not huge $$$ as anything super special or rare I don't think.
As mentioned....I don't see the oil cooler port...so maybe it was a 2 bolt block converted to 4 bolt? Nothing wrong with that at all from a performance standpoint.
…Looks like a typical old school hot rod build looking at the small details. Probably a good strong engine...but not huge $$$ as anything super special or rare I don't think.
I agree.
Originally Posted by JackinIdaho
It is a 4-bolt main
For the sake of value as a 427, it appears to originally be a 2-bolt main block that someone converted to 4-bolt mains. So think 390 or 400hp version, not 435 or an L88. Big value difference between a “factory” 4-bolt main block and a 2-bolt block (4-bolt conversion doesn’t add value in this case).
the value is in having a 1967 casting number…
heads are desireable, but probably $1000-$1500 for the pair as-is. Depends on the condition. Lots of porting etc. pretty much anyone buying is going to be looking for a street engine. If someone wants to race, a454 block is just as good without the premium price.
IMO, $4000-$6000 as it sits, assuming it looks good inside and it’s Standard as you say…. Looks clean and un-oily, so might need a hone/crank polish after sitting 20 years. Definitely inspected and reassembled.
intake, not much value with the weld AND the polishing. For a resto ( the premium value), polished is not desireable. Nicer intakes are easier to find.
all the money there is in the block, someone who wants a dated correct 351 block for their car. nothing on the motor appears to be matched to original. as already said it was a 2 bolt low hp block drilled for 4 bolt mains.
i hate to say the intake is worthless, but it has 2 huge strikes against in- smoothed and polished, and cracked/repaired.
the 858 heads- there are probably a dozen sets on ebay for sale for 1500+. guess what? those same heads have been for sale for years. also condition of heads do not appear to match the block- the bottom end looks "fresh"-ish the heads looks like they were just bolted on the motor.
id pull the heads and intake and list the long block for $4k. IMO they add no valve and are better off sold separately.
427 Motor I have
