Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#3
12-21-2007, 06:26 AM
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Re: 427?
You should get a hold of Rick Bawcom...he's in Texas. He's pretty familiar with some high horsepower big blocks...
HIs name on this site is TXSS Click here for his info!
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Bruce Choose Life-Donate! 
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#4
12-21-2007, 05:00 PM
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Re: 427?
[ QUOTE ]
I'm thinking for about 1/2 the price you could build a bbc to stomp the fire out of that GMMP crate engine... [/ QUOTE ] You got it Rob...get a good use 454 block and just build a 427. I have had some experience with the GM crate engines...you can do much better yourself for a lot less. wilma 
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#6
12-22-2007, 11:29 PM
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Re: 427?
I took a 454 2 bolt main block, put a 6223/3.76 steel crank with 7/16 dimple rods and 427 Keith Black hypereutectic
pistons. Heads were 115cc 6272990 rectangular port with 3933163 intake and 4053/780 vacuum secondary Holley. Compression was 9.975 to 1. Ran on 93 octane and was about 520 HP...... Muncie M20 with 3:73 12 bolt. Tons of fun in my 1968 Nova. The best part about it was it would rev as fast as a small block which is an advantage over a 454 in my opinion. Plus I love rpm's.... 
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 1969 SS396 Post Sedan Delivered to Van-T Topeka KS MCACN Day2 Concourse Gold Award 1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners 1968 Schwinn Orange Krate 1969 Schwinn Pea Picker 1968 Schwinn 5-Speed 1970 Schwinn 3-Speed Deluxe 1972 Schwinn 10-Speed Continental 1973 Schwinn 5-Speed Suburban All Original Paint Bikes
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#7
12-23-2007, 01:45 AM
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Re: 427?
[ QUOTE ]
I took a 454 2 bolt main block, put a 6223/3.76 steel crank with 7/16 dimple rods and 427 Keith Black hypereutectic pistons. Heads were 115cc 6272990 rectangular port with 3933163 intake and 4053/780 vacuum secondary Holley. Compression was 9.975 to 1. Ran on 93 octane and was about 520 HP...... Muncie M20 with 3:73 12 bolt. Tons of fun in my 1968 Nova. The best part about it was it would rev as fast as a small block which is an advantage over a 454 in my opinion. Plus I love rpm's.... [/ QUOTE ] Did you have to use a block girdle or are they splayed mains?
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#8
12-23-2007, 06:37 AM
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Re: 427?
Did you have to use a block girdle or are they splayed mains?
[/ QUOTE ] This was a stock 39999289 block with 2 bolt mains. No modifications are needed to do this. All you are doing is de stroking the motor from a 454 to a 427 when you use a 3.76 396/427 crankshaft. 427 and 454 both have a 4.25 bore. But you have to use 427 pistons with a 3.76 crank. 454 pistons will not work with a 3.76 stroke crank. Just as 427 pistons will not work with a 454 4.00 stroke crankshaft. If you use a 427 piston that is .030 bigger and a 3.76 stroke it is a 433 cubic inch. I have a photo of the bottom end of the motor I built. Let me know if you want more pictures. Hope that helps. Kurt
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