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Old 06-02-2008, 08:45 PM   #1
C.W.C.
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Default 66 Corvette 502/502

Hello, I Have A 66 Corvette With The Original 427/425 That Is Currently Undergoing A Frame Off Restoration. I Had The Engine Rebuilt And It Is Still The Standard Bore And The Pistons Are In Great Shape So I Re-used Them.
I Am Now Starting To Wonder If Perhaps I Should Install A 502/502 Instead Of Putting The Original 427 As With The Poor Octane Fuel I May Have A Problem With Detonation And Eventually Damage The Engine.
Has Anyone Personally Installed A 502 In Their Mid Year?
I Know That It Is Supposed To Be A Bolt In With The Exception The 502 Does Not Have A Fuel Pump. What Did You Do In Your Installation In Regards To Fuel Delivery?
Were There Any Other Installation Issues?
Thank You In Advance For Any Help.
C.w.c.
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Old 06-02-2008, 08:57 PM   #2
newcastlegreg
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Default thinking the same

I have a 67 and am thinking the same way you are. I have heard a couple things about the 502 recently. Apparently they are comming out with a new generation block for this motor. It will have a mech. fuel pump boss. Also it will have a machined clutch boss-I think that means tapped also. Two issues that were a problem. I have been told that if you order one now or soon it will come with this new block.
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Old 06-02-2008, 10:33 PM   #3
zbc51
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I personally installed a 502/502 with a tremec 5 speed 2 years ago in my 66 coupe. I made a detailed post about this 2 years ago. I thinkif you search my name in the old posts it will come up
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Old 06-02-2008, 10:49 PM   #4
67-427ci
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Default

Or you might take a look at the zz454/440hp GM Crate Engine. It is a perfect drop-in. It is machined for a mechanical fuel pump and has a threaded boss for the clutch cross shaft pivot ball. It is not as big a thumper as the 502, but it is no slouch when you get on it.
Roy
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Old 06-03-2008, 12:27 AM   #5
mikem350
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These blocks have the clutch pivot hole in the wrong place. You will need an adapter....search the archives. The rest is pretty much a bolt in!
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Old 06-12-2008, 02:49 PM   #6
LOTSARED
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Default Just replace the heads

My original 427 needed work this past winter. Like you I considered storing it and dropping in a crate motor. But after mulling it over I decided to just store the original heads instead.
An set of modern heads will allow your old motor to run happily on modern fuel. Depending which heads you go with, you can get your compression down to something reasonable... aluminum heads and 10:1 comp should be fine on 93 oct. At most, you may need new pistons also to achieve the desired comp ratio.
Here's where my head went... Whether you run your rebuilt 427, or a new crate motor, it's going to be 20 years before you need another rebuild. I knew that I didn't want to spend the next 20 years being the owner of a numbers matched, original engine Corvette, but driving a Corvette with a crate engine. There are lots of crate engine cars out there, and that's fine... nothing wrong with that at all. But if you own a matched set, don't you want to drive a matched set?
Just another option. I have zero regrets. When I open the hood and someone asks if it's the original engine... yup, it is. And hey... I don't have a 500 lb lump taking up space at home. Either way, enjoy!
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Old 06-12-2008, 05:08 PM   #7
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Default 502

i put a 502 in my 67(last 4 digits of the part number are 8778[460hp, 550ftlb]), the only thing you need to change is the oil pan, and have a electric fuel pump. other then that just make sure to measure the intake manifold you have so you don't have any hood clearance problems. you are going to need a adapter for the clutch i got mine from: http://www.sdparts.com/. and my engine came with a long water pump so i had go get a short one. if you need me to take any pic's to help you let me know.
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1967 Corvette Original Big Block convertible 4-speed, Vette Brake and Products "Big Daddy" suspension, slotted rotors, fender flares, harness bar, hooker side exhaust, GM Performance 502 HO, Holley 4150HP 830cfm, TKO 600 5-speed, 3.36 Rear Gears, 1969 Camaro Front Spoiler, American Racing Torque thrust 2 Grey center with knock-off center caps.
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Old 06-12-2008, 05:23 PM   #8
Stan's Customs
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Quote:
Originally Posted by LOTSARED View Post
My original 427 needed work this past winter. Like you I considered storing it and dropping in a crate motor. But after mulling it over I decided to just store the original heads instead.
An set of modern heads will allow your old motor to run happily on modern fuel. Depending which heads you go with, you can get your compression down to something reasonable... aluminum heads and 10:1 comp should be fine on 93 oct. At most, you may need new pistons also to achieve the desired comp ratio.
Here's where my head went... Whether you run your rebuilt 427, or a new crate motor, it's going to be 20 years before you need another rebuild. I knew that I didn't want to spend the next 20 years being the owner of a numbers matched, original engine Corvette, but driving a Corvette with a crate engine. There are lots of crate engine cars out there, and that's fine... nothing wrong with that at all. But if you own a matched set, don't you want to drive a matched set?
Just another option. I have zero regrets. When I open the hood and someone asks if it's the original engine... yup, it is. And hey... I don't have a 500 lb lump taking up space at home. Either way, enjoy!

..with LOTSARED.

You've already got a great engne. It won't cost much to lower the compression, just a head change. If you want to sell it as 100% original...just change the heads back. (plus you really won't like storing a complete engine...they are always in the way). Another thing is everything "fits" eaxctly they way it should..."everything"! Granted a crate motor isn't hard to do...just isn't an exact swap...

I personally wouldn't swap a 427 for any of the crate of the day big blocks...they are all great engines...but the numbers 427 struck fear into the hearts of many a street rodder back in the day....

...besides, anyone can buy a crate engine...getting an original 427 is another story all together.

My 2 cents..

Regards...Stan M.
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Old 06-12-2008, 06:25 PM   #9
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Default

I did mine a few yars back with a 502 and a Tremec also. Items required are posted above such as an electric fuel pump..(not a big Monster one) as you only need abot 7-9 pounds for the carb. The old version 502 does no have a boss for a mechanical. I'm told the new version GMPP ZZ502 now has a fuel pump Boss and a Clutch ball stud hole so the external bracket is not required
I trashed the crappy Holey for a Barry Grant...runs five times stronger and idols great.

For Headers go with Sanderson Block Huggers as they are made for the 502 Cyl head. Here's a shot of mine from Carlisle before the A/C install..

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Old 06-12-2008, 06:25 PM
 
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