I know this is not a f-body topic but it would be nice to see one of these in a f-body... especially MY f-body!! I was looking through http://www.mortec.com under small block casting #'s and from there looked at 348-409 casting #'s and saw under it a 427! It was made in 1963 only and was for a Z-11. I have no idea what a Z-11 is? Does anyone else know? Anyways it has a 4.312 bore and 3.65 stroke. On a big block 427 the stroke is 3.750 I'm not sure of the bore so I know its not a big block. I e-mailed mortec and they told me is a rare hard to find block and heads and it was a dirrivitive from the 409 W or Y block I think W. Said it wasn't a SBC but its not a BBC either. But anyways this would be a sweet engine to have! Casting # is 3830814 and heads 3837731. I was just wondering if any of you guys have ever heard of this or the Z-11? Also if you have ever seen one or know where one is? Just thought I'd share this with you.

 

Don't know anything about that motor, but a BBC 427 is 4.251 bore x a 3.760 stroke.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft

www.koolmeister.com

 

maybe it was some NASCAR thing GM had to produce to have it raced.

 

There were 2 generations of big blocks in the early 60s, that were not released in production cars. One version IIRC was never produced at all, and the other was race-only as the other post refers to. The 348/409 is often referred to after the fact as the "Mark I" big block, and the 366/396/402/427/454 is the "Mark IV"; those other 2 motors are the other 2 Marks that are missing.

Those motors are extremely rare. There were very few made, they saw only limited use, and there are basically no parts out there for them. Other than as a museum piece, there is no practical use for them any more. They probably would bolt in though, as the 348/409 would (one of my cousins had a 409 in a 79 or so Firebird), so the mounts and bell housing and flywheel specs are probably the same.

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"So many Mustangs, so little time..."

 

RB hit it on the head. It was a big block, just not the more familiar Mark IV. Parts didn't interchange, and GM got out of racing for several years after the '63 season, leaving the guys with those 427's high & dry.

Teams with those cars cleaned up in races they finished.

For whatever reason, Mark III big blocks never saw the light of day. They called this 1963 big block the Mark II, and the 1965 big blocks (396, 427) Mark IV. Go figure.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

The biggest ever "small" block was bored to 4.185 in. with a 4.125 in. stroke for a 454 cu in displacement. but it comes with a high price tag, custom rod, piston, crankshaft, and decrease of block strength.
a good compromise is to buy the gm performance blcok and build a 400.

just my $0.02

dw

 

have you seen the article on kyle and stacy tuckers 69 camaro?? he had an efi sb427 in it. its a sweet car. was in last months (?) or the month before issue of hot rod. if you havent seen it, check it out.

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beau-t-ful yellow 85 iroc

 

By the way, just to complete the information on those a little more, the rare Z-11 option was the option code for Impalas that received those engines in the early sixties. I think it was also available in the Biscaynes, and maybe the Bel Airs, but I know the Impalas got that option for sure. It was kinda similar to the 69 ZL1 Camaros, basically a factory built race car. Also, the engine is considered a big block. It's the first generation big block that Chevrolet offered(the same family as 348,409). A lot of guys are only familiar with the second generation(396,402,427,454).

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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

[This message has been edited by Pat Hall (edited December 25, 2000).]