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  #16 (permalink)  
Old 03-01-2013, 03:15 PM
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you have the heads,choose one of the short blocks that you like.I still like the 420 for a truck

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Old 03-01-2013, 04:22 PM
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Quote:
Originally Posted by vinniekq2 View Post
you have the heads,choose one of the short blocks that you like.I still like the 420 for a truck
I have ordered the heads. I called last week and the heads will take another week or two to get here. I have alittle hesitation about canceling the order. That's why I wanted to hear other options about a short block. Thanks.
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Old 03-01-2013, 05:09 PM
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Just build a 383. They're popular for a reason. You can the the whole short block from jegs or summit.
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Old 03-01-2013, 05:28 PM
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Get a 1985-93 roller cam block(that way you can use less costly stock roller lifters). Buy a 383 Scat crank(3.75" stroke), an 18cc dish piston, 5.7 rods,(6.0 rods to get internal balance) 4.166 bore gasket .039" thick, and a zero deck, the 64cc heads would make for about 9.6:1 static comp. ratio. Use a Comp Cams XR264HR roller cam(1200-5200rpm) for a good throttle response and good torque off 650rpm idle and a Dynamic CR of 8.0:1(87 octane freindly)
Cam Quest software says w/750cfm carb and dual plane intake about 433HP and 485flbs. Quite a bit optomistic I believe.
A 12cc piston would raise the CR to 10.25:1(all other factors identicle). Can get finicky on pump gas, but manageable with alum. heads, good tuning, cold air intake and 91 octane. With a slightly larger cam to keep the DCR similar(8.28:1) Cam Quest software says with a XR276HR cam 456HP and 480 flbs. Again quite a bit optomistic I believe. The specs for the 276 cam state 1900-5600.
I admit both cams may be too mild for many, but it is a fairly heavy truck and that means its gonna need some torque down low to get going.JMHO
FWIW,
ssmonty

Last edited by ssmonty; 03-01-2013 at 05:34 PM.
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  #20 (permalink)  
Old 03-01-2013, 05:32 PM
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Or grab a 6.0 out of a 2001+ chevy, gmc or cadillac. Those motors are torque monsters.
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Old 03-01-2013, 07:13 PM
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Originally Posted by Mr. P-Body View Post
It's a GMC! Put a Pontiac in it so it "looks right" and will drag that small block backwards down the street... (:- I always liked those trucks. Wanted a '59 since high school, when a girl I was "chasing" had her dad's with a 370 and 4-speed "Hydro" in it. Stock as a rock, and a VERY strong runner.
In any case, build for torque and low-speed power, due to the weight.

Jim
I agree with Jim. If a 57 GMC were equiped with a V8, it would have been a Pontiac and all traditional Pontiac blocks are externally the same size. With torque down low, it would make an ideal cruzin' engine vs an engine that makes torque at a higher rpm.

Bill
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Old 03-01-2013, 07:29 PM
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Originally Posted by WDCreech View Post
I agree with Jim. If a 57 GMC were equiped with a V8, it would have been a Pontiac and all traditional Pontiac blocks are externally the same size. With torque down low, it would make an ideal cruzin' engine vs an engine that makes torque at a higher rpm.

Bill
The neighbor across the street has a 455 in an old pontiac. Its been setting for awhile. I know it has less than 50,000 miles on it. Pretty sure I could get it for a song and dance. I will have to go back tomorrow and see the car again. It belonged to the neighbor's mom. Another option.
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