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Old 08-31-2006, 06:03 PM
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454 questions

Hello all, first post here. hope this is as helpful as other forums i have been to. I have access to a 454 truck motor from the early 80's haven't run any numbers yet. Was wondering if i could slap some heads on it, a cam intake and carb, and get atleast 425 hp out of it. And will this hold up bracket racing? More or less i am wondering if i can produce that kind of reliable horsepower without getting into the lower end of the motor( the motor is real low mileage) thanks to anyone that can help!















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Old 08-31-2006, 06:18 PM
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Yes you should be able to make that kind of power no problem.It probably has the small peanut heads,but should have a forged crank and 4 bolt mains and maybe the 7/16 in bolt rods,I'm not sure on the rods,but even if they are the 3/8 variety a good set of rod bolts will hold up.Lots of heads to choose from,factory oval port's with the #'s ending in 049 would be a good starting point,the aftermarket also has a wide range.Cam selection is a matter of who you want to buy your cam from,each manufacturer can supply you with what you need.
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Old 08-31-2006, 06:39 PM
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what if its a 2 bolt main? still worth doing?
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Old 08-31-2006, 06:50 PM
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Yes a 2 bolt main block will be plenty strong for 425 HP,but for a little extra security you could put studs instead of bolts in.Any power adder add on's ( nitrous,blower,turbo)would probably require a four bolt main block,although you can buy 4 bolt main caps from the aftermarket,but they would need to be align honed.
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Old 08-31-2006, 11:21 PM
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Here are a couple of links you may be interested in.

Big power, small dollars

Oval Ports vs Rectangular Ports

Big-Block Bumpstick Blowout

Big Block Part Identification Numbers

Cylinder Head database


HTH,
Don
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Old 09-01-2006, 12:30 PM
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thanky you guys for the info. i found the numbers it's block casting number 14015445. and its a 1978 out of an ambulance. so any ideas of heads and cam specs to get a solid 425 hp. should i just stick with gm parts scrounge around and find em cheap?
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Old 09-01-2006, 12:41 PM
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781 bbc heads are 2nd in line after 049s for stock bbc head castings #s

a buddie built a 454 2 bolt block with steel crank and forged rods & pistons and arp fasteners & set of 66 impala 396 closed chamber heads 14.1CR it was balanced. it run a 11.11 at 111mph in the 1/4 best time was a 10.99 (car was a 64 chevelle 2dr wagon) was around 635hp (all motor) it went 3 or 4 seasons b4 he sold the car, (he has several 454 4 bolt mains he could of built, hes in the office of a good size salvage yard, so he has collected desirable chevy big & small block parts since early 80 he has 2 50x100 building full, some newer desirable parts he will sell out of his stash, but won's sell any older bbc parts, he only sells bbc parts if there late model) still has motor. its being used as a mock up for a 55 Chevy 4speed 2dr post car. said he might be broke enough when 55 is done he might run the 14.1cr 454 for a Saturday nite cruiser till he can build a streetable big block.

I Guess I'm saying don't be afraid of a 2bolt big block.














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Old 09-01-2006, 12:51 PM
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Quote:
Originally Posted by Lousdepot
thanky you guys for the info. i found the numbers it's block casting number 14015445. and its a 1978 out of an ambulance. so any ideas of heads and cam specs to get a solid 425 hp. should i just stick with gm parts scrounge around and find em cheap?
Ummm ... the link "Oval-ports vs Rectangular Ports" in my above post shows you almost exactly what you need to do. "Test 2" resulted in 419 HP, which is awfully close to your goal.

049 or 781 heads
Machine them to accept 2.19 / 1.88 valves
220 duration / 0.500 lift cam
Weiand Intake (RPM AIr Gap would be similar?)
850 CFM Holley
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Old 09-01-2006, 01:00 PM
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guys, what if i took the specs of the 454 ho crate motor the one with 425 hp and copy the heads cam inteke and carb specifications. will this work? actually sounds like a lot of options will work but i guess i am wondering what is best for reliable hp for the $$
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Old 09-01-2006, 01:02 PM
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I agree with the 049 or 781 heads, but what do you want this motor to do? Are you looking for more of a street/strip motor that will only see weekends and the strip or more of a daily driver or something inbetween? That will have alot to do with what you do for a cam and intake. Depending on what you do to the heads, if anything at all, and what you do for compression and the other components, you are looking at anywhere from ~400 hp to 600+ hp.

Adam
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Old 09-01-2006, 01:37 PM
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here's the deal i run a '52 henry j(race only) with a pontiac 400 (low horsepower) 240 hp to the ground running mid to high 12's. the pontiac is driving me crazy, i prefere the chevy. I have a 55 chevy street car with a ls6 in it and its just reliable horsepower for the past 15 yrs. I got access to the big chevy truck motor and turbo 400 for nothing. What i want to do is put heads cam intake and carb on the 454 drop that and the t400 into my henry j and go racing. i figure i can afford to do this now. other than that i will wait and spend the 6k and put a crate motor in it. I feel i can get the car in the mid 11's easy with a 425 hp big block and get long life out of it because i wont have to beat it to go fast. i am rambling but maybe you get my drift!
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Old 09-01-2006, 07:33 PM
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If what you are trying to say is that you want to use the rectangular heads off your LS-6 along with the high rise aluminum dual plane factory intake and carb I say go for it.Use as big a cam as will fit without hitting the pistons,preferably a solid roller.The limiting factor will be the factory intake manifold.I have a LS-6 crate motor in my 86 Monte Carlo SS and even with a big roller cam it doesent do much over 6000 RPM,and I have the LS-6 intake manifold on it.
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Old 09-01-2006, 10:34 PM
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No way the Ls6 is staying where it is, that motor runs too strong i will never mess with it. i am taking the 454 truck motor, putting heads on it, intake and carb and throwing it in the henry j and gonna run it. I wont even shift it higher than 5500 or 6k. just got to get it in the mid 11's which will be no problem as car with pontiac 400 weighs 2800lbs. i gotta try this motor because i can get it for no $ so with 1500 bucks in it i should be able to get 400 - 425 hp. hopefully!
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Old 09-02-2006, 10:29 AM
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Here is a motor to consider. The heads are ported a little, and it is a hyd roller cam, but this will give you an idea of what the 781 heads are capeable of.

468 9.5:1
cleaned up 781 heads with 2.19 1.88 valves
port matched and ported victor jr
242 248 @.050 .600 lift hyd roller cam

This motor made a max of 566 hp at 6100 RPM and 560 tq with heavy 25w50 oil on the dyno. With no porting and a hyd roller cam, you may loose ~75 hp, but you would still be at 450 pretty easily. Here is what I would recommend

your short block
781 or 049 head with 2.19 1.88 valves (and some clean up porting if you can afford it)
9.5-10:1
If you dont mind setting valves, I would recommend the XS282S (244 252 @.050 .590 .598 lift) or the xs274s (236 242 @.050 .568 .578 lift) I dont know how much room you have for piston to valve clearance, so the smaller one may be the way to go. With it only being a race motor though, I would go with the bigger one if you could. Either way, I would probably go wtih the performer RPM intake, you could go with a victor jr with the larger cam, but it would take some low end away. If you dont want to set the valves, I would go with the XE284H cam. If the heads were ported you could go bigger on the cams, but you would also need to increase compression. With any of these, I would run a ~3000 stall.

Adam
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Old 09-02-2006, 07:38 PM
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Alright now where do i find a good set of 049 or 781 heads? priced out the big heads that are on the 454 ho and the 502 crate motors and they are big $$ so looks like i am leaning towards the oval ports. i really appreciate the help and cant wait to see the results in the 1/4.
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