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Old 09-06-2004, 09:01 PM
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396/454

My 86 1 ton truck spun the no. eight rod bearing in a 454. While deciding whether to replace or rebuild, I found a 73 1 ton from the local classifieds and bought it for $900. Drove it home 75 miles, pulled it into the shop and promptly pulled the motor. The next day I pulled the 86 454 and while tearing it down I found nothing unusual other than the pick up screen was full of old silicone. No doubt the reason for the low oil pressure and spun rod bearing. The third day I pulled the 73 engine out and discovered a 396 not a 454 as the owner swore it was a original 454. Since the 454 has a spun bearing and a future life as a mud bogger I'm thinking of making the 396 homey in the 86 1 ton. Later tonight I discover the 454 has a two piece seal and 3993820 large chambered heads that have been remaned not so many miles ago. I'm guessing 25,000 or so. I also know the the 454 is external balanced and the block (14015445) was original to the 86 1 ton. Now what to do with the 396, that has a domed piston and 3917215 closed chambered, oval port heads with 101 cc chambers and three burnt and cracked valves? I am thinking of using the 454 heads an the 396 and having a compression ratio of near 11:1 I believe. I might be experimenting a little on this one to try and make it work. I'll have to use the 396 clutch and flywheel. Does any one know if the 454 heads will fit the 396 block and will the domed pistons clear the valves with a Comp cam 268H and .500 lift?

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Old 09-06-2004, 09:24 PM
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The 454 heads will fit...........
Hit the pistons ?? I do not know.

There is NO replacement for displacement ..

Fix the 454.............IMHO


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Old 09-06-2004, 09:25 PM
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I would sell the 396 and use the money to rebuild the 454.
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Old 09-06-2004, 10:33 PM
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Yes, the 454 heads will fit on the 396. However I don't think you'll wanna go that route. (Unless maybe you're gonna make this puppy blown?) I have a '72 402" that I bought off a guy a long time ago. It never really had the "balls" that I thought it should have. When I tore it down for the rebuild, I found that at some point, someone replaced the original heads with a set of open chamber 118cc 454 heads.

The other guys might be able to tell you what combo you wanna go with. I'm just sharing what I have experienced.

Rock on and God bless...

Seņor
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Old 09-07-2004, 12:53 AM
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i had a 396/375 in a 68' ss wide ratio 4 speed and very tall gears ss/rs camaro that i rebuilt and stuck a bigger cam in and i never had so much fun in my life.you have an opportunity to make one heck of a stroker motor.with those heads and 454 crank in the 396 with a .030" bore you'll have a 427.8.but a stroker 427.8.
you could destroke the 454 the same with the 396 crank and come up without boring,426.7.if you wanted,you could have some fun with that.
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Old 09-07-2004, 07:34 AM
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Sounds like a plan is in action. Looks like with the pop tops of the 396 and the open chambered head might not be the best for flame front travel I'm not really all the interested in making high amount's of power with this one. It's going to be our dirt car toter all winter and next summer. I'll play with the cam timming if the valves wont clear with a .500 lift. What's left with the 454 will probably get the 396 closed chambered heads, a pocket port and domed pistons for max compression to use in next years mud truck. Thanks to all.
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Old 09-07-2004, 09:30 PM
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Sounds like fun.
Just out of curiousity, how does the combo break down for pistons/rods/crank for a 396/427 crank in a 454?
Would you use the 454 pistons with the 396 or 454 rods
or would you have to go with an aftermarket piston to compensate for the loss of deck height to destroking?
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Old 09-07-2004, 11:32 PM
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Quote:
Originally posted by ratlover
Sounds like fun.
Just out of curiousity, how does the combo break down for pistons/rods/crank for a 396/427 crank in a 454?
Would you use the 454 pistons with the 396 or 454 rods
or would you have to go with an aftermarket piston to compensate for the loss of deck height to destroking?
a 396/427 crank in a 454 block makes a 427 so you would just use 427 pistons.

johnsongrass1, if you have 215 closed chamber heads on the 396 and the pistons are stock, it should be 10.25 to 1. you can run the 454 heads on the 396 but you lose about 1 point of compression. if you used 10.5 to 1 closed chamber 396 pistons and you used the 454 heads, you would have approx. 9.5-9.7 to 1. i have to agree that selling the 396 to fix the 454 would be the best thing to do. not only are 454 parts cheaper, you`ll have more torque. it should`nt cost too much if you just need to change out the crank and maybe the rods. that $900 you spent on the other truck would have been a good start.
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Old 09-08-2004, 07:36 AM
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The 396 parts cost a lot more than the same parts for a 454.

Troy
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Old 09-08-2004, 08:06 AM
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Thanks for the compression numbers. tonight I'm going to mock up everything, Clay it, CC the heads and do some figuring. The plan was to spend 900 on this older 1 ton, use the motor, And save whatever left over part's for either my half ton or my friends 3/4 ton. So by using the 396 block and 454 heads we still have a 454 block to use for a mud truck motor with alumium heads. The 396 with with a 218@.050/500 lift should net enough torque below 3000 to pull my race car. My half ton chevy short bed with a 305 pulls it all day long sometimes. We can also use the 396 heads after fixing the burnt valves for use with the 454 block with flat top piston and get a puller motor as well.

AHhhhhh The possibilities!!!
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