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Old 02-06-2012, 09:02 AM
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454 big block

hey i took a 454 out of a 85 suburban, and changed the heads to ones out off of a chevelle. went from peanut to oval ports! but it seems like i a missing on the initial get down. could this be due to the heads being taller from the chevelle then the original ones? if so do i need to change the rods or can i just to to a cam that is bigger to get full contact on the rods to open the valves all the way on the stroke?

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Old 02-06-2012, 09:11 AM
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what... heads taller?
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Old 02-06-2012, 10:49 AM
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Yes i think they are?
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Old 02-06-2012, 10:58 AM
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I have 454 peanuts
454 rec port, and dart pro1's

the ports are bigger on all but the peanut, but the heads themselves are not taller..
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Old 02-06-2012, 11:12 AM
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That era of the BBC are low compression slugs. You need to ditch the coffee can pistons to get the CR up and swap out for a better cam and intake. They can be made into a great engine, but it will take some work. Getting rid of the peanut port heads is a great start, but it's not enough. JMO
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Old 02-06-2012, 11:12 AM
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Any chance you have a BBC tall deck block? I've heard some BBC truck blocks might be, maybe only commercial vehicles, not sure, not a BB person. Does the intake sit squarely and flat on the heads with no gaps?

BTW, a "bigger" cam isn't going to fix it.
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Old 02-06-2012, 11:31 AM
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Quote:
Originally Posted by 68NovaSS
Any chance you have a BBC tall deck block? I've heard some BBC truck blocks might be, maybe only commercial vehicles, not sure, not a BB person. Does the intake sit squarely and flat on the heads with no gaps?

BTW, a "bigger" cam isn't going to fix it.
you're thinking 366/427(truck)/502
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Old 02-06-2012, 11:37 AM
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So what so u think can be causing the lack on the initial take off?
And any suggestions on a good cam to slap in there? The heads havw already been done!
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Old 02-06-2012, 09:30 PM
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Did you accurately set up the timing?
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