thoughts on 427 - Chevelle Tech
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  • 3 Post By Tom Mobley
 
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post #1 of 7 (permalink) Old Jul 2nd, 20, 9:36 AM Thread Starter
 
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thoughts on 427

Ok so I was at an auction this week and got a 427 tall deck for.........600$. It was all sealed up and painted. Quite a steal. Without complete disassemble I have kinda figured out what is inside of her. Bare in mind this is my first Chevy/Pontiac build (Chevy: motor 427, trans my6 4 speed od) (Pontiac: 1965 gto) grew up on Ford's blah

Intake manifold: stock 427t tall deck intake

Heads: #3931063 69-70 oval port heads. They appear to be stock. Can't tell if milled or compression gasket but exh valves are stock measurement. Random assortment of factory rockers.

Camshaft: I haven't pulled it out but I'm guessing factory I don't know. Though I have a stock l88 camshaft I could throw in it.
Pistons: from what I can see they are 30 over. They are stamped .030 over on underside and measured 4.28. they look to maybe be flattop deep quinch but cant say for certain

Rods: H beam style. Length is 6.8 maybe 6.5 but im lean more towards the 6.8. No branding that I can see. I measured them the best I could with a tape since I couldn't get anything in there more precise

Crankshaft: is 3556223

The rest is unknown.

So what should I do? How much horse/toque is this going to be? What size carb? What is my compression ratio and can I run it on pump? Do I need a special harmonic balancer for this motor? Is my new process my6 trany going to hold up? I was going to get the counter shaft bushed.
I don't I guess school me lol. Thanks in advance. I'm quite excited about getting this motor and at a a great price at that. The car 90% street...I have never drag raced but if I got the power for it I'd probably try it
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post #2 of 7 (permalink) Old Jul 2nd, 20, 9:57 AM
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Vince
 
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Re: thoughts on 427

welcome to the site;
tall deck blocks can be more difficult to fit under some hoods.
what are you planning on putting this engine into??
does it have aftermarket rods and car pistons or
does it have stock rods and 4-ring truck pistons???
truck pistons are real heavy,,,

68-Malibu 427bbc/t4oo/3.73-12bolt/pro charger f1-r
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post #3 of 7 (permalink) Old Jul 2nd, 20, 10:00 AM Thread Starter
 
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Quote:
Originally Posted by VinceS427bb View Post
welcome to the site;
tall deck blocks can be more difficult to fit under some hoods.
what are you planning on putting this engine into??
does it have aftermarket rods and car pistons or
does it have stock rods and 4-ring truck pistons???
truck pistons are real heavy,,,
Thanks I have always been here just never official lol
I'm putting it in a 1965 gto
It has aftermarket car pistons and rods.
I listed specs in first post thanks
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post #4 of 7 (permalink) Old Jul 2nd, 20, 10:06 AM
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Tom
 
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Re: thoughts on 427

You have a tall deck - stroke it for cubic inches! I like the 427 myself, but why waste a good base for a large cubic inch engine. If they are flattop pistons, your compression will be in the 8.5:1 area.
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post #5 of 7 (permalink) Old Jul 2nd, 20, 10:14 AM
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Re: thoughts on 427

Don't spend a dime on it and try to resell it. A complete waste of time and money.
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post #6 of 7 (permalink) Old Jul 2nd, 20, 10:24 AM
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Tom Terrific II
 
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Re: thoughts on 427

What Bonkerman said.. That is a money pit waiting to happen. Sounds good, is a PITA in real life.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #7 of 7 (permalink) Old Jul 2nd, 20, 10:38 AM
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Bob
 
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Re: thoughts on 427

nothing wrong with tall deck 427-hood scoops work perfectly well, best I can remember the stock intake is lower than L78 manifolds from that vintage Chevelle, before you make any decisions you need to CC the heads and pistons since you know the engine has been modified
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