Possible new motor - Team Camaro Tech
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post #1 of 14 (permalink) Old Oct 20th, 16, 11:57 AM Thread Starter
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Possible new motor

I have someone that's offering me this rebuilt 502 for pretty short money. It was recently built by a machine shop out of a GM otc block. It dynos at 540 hp & 520 lbft so she's pretty healthy.
What I need to know is, can you guys tell from looking at the pics what gen it is and if I'd run into any problems swapping the goodies over from my 402 and would it mate to my M21 and 621 bellhousing ok?









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post #2 of 14 (permalink) Old Oct 20th, 16, 12:16 PM
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Re: Possible new motor

Mate - Yes.
Generation - don't have a clue - but an early one because of fuel pump rod?
Coat cylinder walls with oil.
Change cooling jacket plugs with drain petcocks.
Spray everything with WD40 until installed and running.
Use your water pump - one installed could be a reverse rotation.

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post #3 of 14 (permalink) Old Oct 20th, 16, 12:24 PM
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Re: Possible new motor

Sgt. Sir, I am seeing motors of two colors or unpainted, So I presume they are the same motor.
From the rear of the motor I see you will need your pilot bushing since you are running the M21. I see no issues running the 621 bellhousing if you have the 168 tooth flywheel and clutch to match.
In the front of one picture I see a balancer, So I again presume its a balanced motor , and you will use what flywheel you have.

i also see this motor is a stock style roller cam set up , so you are good here. Am I seeing the motor with heads on , having studs . If so , thats a plus. This bottom end picture tell me you have the large 7/16" rod bolts.
Any reason for the bleeding plug on the rear of the oil plug, back of motor?

That's all I can tell you from here, Sir. Thank you for your service.

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post #4 of 14 (permalink) Old Oct 20th, 16, 12:40 PM Thread Starter
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Re: Possible new motor

Thanks a lot Everett & Don. That's great news. Yes, the pictures are all of the same motor. Before and after being rebuilt. It's presently in the condition you see in the first picture. Complete, broken in and ready to rip. It's supposed to be BMF. I don't know if that means they built it, there are BMF parts in it or what. I still need to find out a little more.
I'll check out the water pump. It appears identical to the one I pulled off my 454 a few years ago and put on my 402 originally. I haven't got a clue about the bleeding plug. That was one of the first things I noticed too. I'll find out. Changing out the drain plugs for petcocks is a definite. The first time I pulled a set of heads without draining the block taught me that one.
Now here's the big question... Worth $2,500? Seems like a no brainer to me considering what engines are going for these days, but...

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post #5 of 14 (permalink) Old Oct 20th, 16, 06:20 PM
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Re: Possible new motor

Yes - worth it.

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post #6 of 14 (permalink) Old Oct 20th, 16, 06:24 PM
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Originally Posted by everett#2390 View Post
yes - worth it.
x2
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post #7 of 14 (permalink) Old Oct 21st, 16, 06:10 AM Thread Starter
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Re: Possible new motor

Thanks guys. That's what I figured. Seemed like a pretty good deal to me. Now to see if I can finalize a deal and get it in my 69.

'69 SS396 X66 L34 08D M21 BS
460ci Gen VI 9.75:1 AED 950 carb
241/249 @ .050" .625/.625 110 LSA

Semper Fi!

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post #8 of 14 (permalink) Old Oct 21st, 16, 06:22 AM
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Re: Possible new motor

YES, worth it. IF it is a 502, then it is most likely a newer Gen. 6 block. Originally, ALL 502 big blocks were cast WITHOUT the mechanical fuel pump boss. They only started adding them to the new 502 blocks a couple of years ago. A complete rebuilt 4 bolt main 502 big block , ready to run for $2500 is a heck of a good deal. I noticed it had flat top pistons in one of the pictures. The only thing I would check out is what compression ratio the motor is. 9-10:1 is a good ratio for a street engine. If it makes 540HP and 520 LB., then you are probably in the ball park. Either way, it's a good deal. I would grab it.

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post #9 of 14 (permalink) Old Oct 21st, 16, 07:01 AM
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Re: Possible new motor

All 502's are a Gen VI. They will accept older style heads like those cast iron ones I see in the photos only with a special head gasket that seals off the water passages that differ from older Mark IV engines. Since your photos show a fuel pump boss (blocked off with black painted plate), and a one piece rear main seal I know you have a Gen VI block.

The 502 has 8.2 cast into the side of the block in big numerals. If it says 7.4 you have a 454.

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post #10 of 14 (permalink) Old Oct 21st, 16, 08:09 AM Thread Starter
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Re: Possible new motor

Quote:
Originally Posted by Matt 69 View Post
YES, worth it. IF it is a 502, then it is most likely a newer Gen. 6 block. Originally, ALL 502 big blocks were cast WITHOUT the mechanical fuel pump boss. They only started adding them to the new 502 blocks a couple of years ago. A complete rebuilt 4 bolt main 502 big block , ready to run for $2500 is a heck of a good deal. I noticed it had flat top pistons in one of the pictures. The only thing I would check out is what compression ratio the motor is. 9-10:1 is a good ratio for a street engine. If it makes 540HP and 520 LB., then you are probably in the ball park. Either way, it's a good deal. I would grab it.
Thanks Matt. I was worried about the compression too. She's 10.5:1. Right where I want. I didn't want to go above that for a mostly street car.

Quote:
Originally Posted by Larger Dave View Post
All 502's are a Gen VI. They will accept older style heads like those cast iron ones I see in the photos only with a special head gasket that seals off the water passages that differ from older Mark IV engines. Since your photos show a fuel pump boss (blocked off with black painted plate), and a one piece rear main seal I know you have a Gen VI block.

The 502 has 8.2 cast into the side of the block in big numerals. If it says 7.4 you have a 454.

Big Dave
Thanks Dave. Awesome info. I'll check those things out when I see it tomorrow. Hopefully I'll be bringing it home...
I love that it'll have a ton of power and look basically stock. The average guy will have no clue that it isn't a 396/402...

'69 SS396 X66 L34 08D M21 BS
460ci Gen VI 9.75:1 AED 950 carb
241/249 @ .050" .625/.625 110 LSA

Semper Fi!

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post #11 of 14 (permalink) Old Oct 21st, 16, 09:36 AM
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Re: Possible new motor

Put OE stock valve covers on, paint intake Chebbie orange, mount a fuel pump without the pushrod, and stock air cleaner.
More Sleeper appearance.

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post #12 of 14 (permalink) Old Oct 21st, 16, 12:11 PM Thread Starter
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Re: Possible new motor

Quote:
Originally Posted by Everett#2390 View Post
Put OE stock valve covers on, paint intake Chebbie orange, mount a fuel pump without the pushrod, and stock air cleaner.
More Sleeper appearance.
I couldn't agree more, but I want to see if I can get my spare set of M/T valve covers to fit.
I just talked to the guy. I should be picking it up tonight after my sons football game. Now I'll need to set up my Holley 850. I'm glad I didn't get rid of it. I'll need to come up with a fuel pump set up too.

'69 SS396 X66 L34 08D M21 BS
460ci Gen VI 9.75:1 AED 950 carb
241/249 @ .050" .625/.625 110 LSA

Semper Fi!

"The galleries are full of critics. They play no ball, they fight no fights. They make no mistakes because they attempt nothing."
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post #13 of 14 (permalink) Old Oct 21st, 16, 04:01 PM
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Re: Possible new motor

Go out and buy the edelbrock mechanical pump, tear the sticker off of it on the way home and then scotch brite the entire pump, makes it look like a factory cast piece, no regulator needed, simple and has more than enough capacity to go in excess of 121mph in the quarter. I would put the 396/375 stickers on it and run a factory 163 winters intake.

I have one of my Holley 850 dp on eBay right now, I really do not need 4 carbs for one car! 3 yes, but 4 seems a little excessive.

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post #14 of 14 (permalink) Old Oct 21st, 16, 05:52 PM Thread Starter
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Originally Posted by 1971ls6 View Post
Go out and buy the edelbrock mechanical pump, tear the sticker off of it on the way home and then scotch brite the entire pump, makes it look like a factory cast piece, no regulator needed, simple and has more than enough capacity to go in excess of 121mph in the quarter. I would put the 396/375 stickers on it and run a factory 163 winters intake.

I have one of my Holley 850 dp on eBay right now, I really do not need 4 carbs for one car! 3 yes, but 4 seems a little excessive.
You can have to few, but never too many... I made the deal tonight. It's an 8.0 block, so 489 to start. Bored and stroked also. I'd love to go with a mechanical pump, but the roller cam doesn't have the pump concentric.
The part that looked like a vent above the rear main seal is just a fitting placed there to plug the oil pressure port temporarily.
This is a tall deck block, so I'm assuming even with a notched valve cover it would hit my stock brake booster.
I've read something about distributor issues. Should my stock dizzy fit?














Last edited by HawkX66; Oct 21st, 16 at 06:02 PM.
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