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Old 09-15-2011, 09:05 PM
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My first 454

Hello, new to the forum, I have a 76 GMC Sierra Camper special that came with a 454, but currently has a 350, I have decided to bring it back to its original state by putting a big block in it.

Now for the build, the motor is a 2 bolt main 75 454 with peanut port heads. It is in the machine shop on the waiting list right now. It will be going .30, hypertentic? pistons, and reconditioned rods.

I am going to have edelbrock carb, intake, and camshaft. Cam specs
Cam Style Hydraulic flat tappet
Basic Operating RPM Range Idle-5,500
Intake Duration at 050 inch Lift 218
Exhaust Duration at 050 inch Lift 228
Duration at 050 inch Lift 218 int./228 exh.
Advertised Intake Duration 292
Advertised Exhaust Duration 302
Advertised Duration 292 int./302 exh.

I am going to be staying around 8:1 compression or lower is possible. This is going to be mild street build. I was wonder what kind of power to expect with such a combo. Thanks guys if i was unclear in anyway let me know and ill try to clear things up...its late here haha

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Old 09-16-2011, 06:06 AM
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use a small dome and get 8.75:1 cr. It still will run on 87.

can use find a better set of heads? 781, 049, 820.

use headers if power is a big concern.

I would use a regular RPM intake (not air gap) and a holley 3310 (750 cfm).

should make around 400hp and 500ftlbs.

FYI, big blocks need to be setup tighter than a small block. use 0.0015" to 0.0020" bearing clearance on the mains and rods, and 0.0025 to 0.0035" on the rear main bearing. Otherwise, oil pressure will drop when warm at idle.

that cam needs more than a highway gear. What gear and tire diameter are you going to use?

Last edited by 454C10; 09-16-2011 at 06:23 AM.
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Old 09-18-2011, 10:35 AM
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Im sticking with the peanut ports, nothing wrong with them, i wont be buzzing past 4k anyway on any given day. I have 4:10 rear gear and plan on 31" tall tires.
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Old 09-19-2011, 07:09 AM
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your cam should be ok with that gear and tire combo.

but I would use a little dome to get the cr up to 8.75:1.
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Old 09-19-2011, 05:37 PM
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I'll bet you have a cast iron crank!!? ...So no need to do anything too radical. Roller bearing timing chain, high volume oil pump ...maybe a wind-age wiper in oil pan. Hardened seats under the exhaust valves, bronze inserts on valve guides, and new valve seals (not stock!). I'd go for headers definitely! 4:10 is pretty "tall" for the street (unless gas mileage is not an issue for you)! ...I'd "suggest" something around 3:73's. And shim your dist., ONLY thing that's on the border-line is whether you should go with new rod bolts? Stock bolts are alittle stretchy, but if you're not getting into high RPM you should be ok ...other wise I'd suggest ARP rod bolts. I've got this combo on my 454, no complaints! ...Good Luck!
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Old 09-19-2011, 06:55 PM
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I want as low compression as possible 8:1 is probably where i will sit. I have msd ignition system for it. I am going with new arp crank bolts, and head bolts, and rod bolts. Thanks for all the replies! I am a stickler for original stuff, it has everything orignal so trans and rear end are staying, I lucked out with the motor, looked great on the inside, damn near perfect...out of a 75 camper special scottsdale!
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Old 09-19-2011, 07:07 PM
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my 78 had a 454 in it it , replacing it with 327 now, got the old heads tho if ya interested i think they are 781 heads
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Old 09-20-2011, 06:07 AM
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4.11's with 31 inch tall tires is like a 3.55 gear with 27 inch tall tires.

yes, still a little tall for highway use. But good around town and for towing.
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