Trailering Special? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GMC910 · 08-12-2011, 09:20 AM

My possible donor vehicle for my truck build is a late 70?'s suburban... Apparently its a "Trailering Special" with a 454. I need the 454 provided it's a 4 bolt block and I'm hoping it has a 12 bolt diff.. With the "Trailering Special" is it more likely that the 454 is a 4 bolt?
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cst70rocket · 08-12-2011, 03:37 PM

Just wondering why do you need a 4 bolt block? The 2 bolt big blocks will handle more than the majority of the free world will ever throw at them. 700 plus hp on 2 bolt, if you get closer to 800 go with splayed caps, which will start with a 2 bolt block anyway.

TJBrown · 08-12-2011, 04:20 PM

I ran a 2 bolt 30 over 4.250 stroke cranked production 454 block im my dragster for a year or so. I used to twist it to 8k. Held together like a champ. 7.90's in the quarter. Not sure of the HP rating as i never had it on a dyno.

406 Q-ship · 08-12-2011, 04:54 PM

2 bolt Big Block is more than strong for a regular truck.

69GMC910 · 08-12-2011, 05:05 PM

Want this engine to last. It'll be 600+ hp and my engine builder has his heart set on a 4 bolt for some reason...
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69GMC910 · 08-12-2011, 05:06 PM

Maybe it's cuz we r stroking it??
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cst70rocket · 08-12-2011, 05:42 PM

eh 2 bolt is fine at 600hp level for ever. If he's concerned about strength, put splayed caps on it. I've ran pretty wild 2 bolt big blocks on nitrous up at 800hp level and no problems.

ozark · 08-12-2011, 07:50 PM

Good luck on it being a 4 bolt main block. Most of all the 454's that came out of trucks originally(the ones I have gotten over the years anyway) have always been 2 bolt. Same with a steel crankshaft they have always been cast.

b454rat · 08-12-2011, 09:42 PM

All the 454s I've had came out of trucks, all were 2 bolt mains. One or two of them were in crew cab dually's, still 2 bolt.

If you just got to have a 4 bolt, then splay the caps, it's stronger than a factory 4 bolt. But I think it's overkill. I had a 500+ 468, spun to 7500 quite a bit, never a problem. Was even cast crank and small rods.

80SPORT · 08-13-2011, 12:29 AM

All the pickup 454s i have seen have 2 bolt mains;the early (73-74) units seem to have forged cranks ...later ones cast ...may have been when they switched to the peanut port head.

As a rule 4 bolt mains only came on square port hi perf car motors.

And on the tall deck medium duty motors

blakeduren · 08-13-2011, 12:46 AM

my 83 454 was a 4 bolt block.

08-12-2011, 09:20 AM	#1
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Trailering Special? My possible donor vehicle for my truck build is a late 70?'s suburban... Apparently its a "Trailering Special" with a 454. I need the 454 provided it's a 4 bolt block and I'm hoping it has a 12 bolt diff.. With the "Trailering Special" is it more likely that the 454 is a 4 bolt? Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph

08-12-2011, 03:37 PM	#2
cst70rocket Registered User Join Date: Sep 2005 Location: San Angelo or Eufaula Posts: 301	Re: Trailering Special? Just wondering why do you need a 4 bolt block? The 2 bolt big blocks will handle more than the majority of the free world will ever throw at them. 700 plus hp on 2 bolt, if you get closer to 800 go with splayed caps, which will start with a 2 bolt block anyway.

08-12-2011, 04:20 PM	#3
TJBrown Registered User Join Date: Jul 2011 Location: Shreveport La Posts: 73	Re: Trailering Special? I ran a 2 bolt 30 over 4.250 stroke cranked production 454 block im my dragster for a year or so. I used to twist it to 8k. Held together like a champ. 7.90's in the quarter. Not sure of the HP rating as i never had it on a dyno. __________________ 85 Silverado SWB

08-12-2011, 04:54 PM	#4
406 Q-ship Registered User Join Date: Oct 2010 Location: Largo Florida Posts: 632	Re: Trailering Special? 2 bolt Big Block is more than strong for a regular truck. __________________ Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."

08-12-2011, 05:05 PM	#5
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: Trailering Special? Want this engine to last. It'll be 600+ hp and my engine builder has his heart set on a 4 bolt for some reason... Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph

08-12-2011, 05:06 PM	#6
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: Trailering Special? Maybe it's cuz we r stroking it?? Posted via Mobile Device Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph

08-12-2011, 05:42 PM	#7
cst70rocket Registered User Join Date: Sep 2005 Location: San Angelo or Eufaula Posts: 301	Re: Trailering Special? eh 2 bolt is fine at 600hp level for ever. If he's concerned about strength, put splayed caps on it. I've ran pretty wild 2 bolt big blocks on nitrous up at 800hp level and no problems.

08-12-2011, 07:50 PM	#8
ozark Registered User Join Date: Jan 2008 Location: Eureka Springs AR Posts: 179	Re: Trailering Special? Good luck on it being a 4 bolt main block. Most of all the 454's that came out of trucks originally(the ones I have gotten over the years anyway) have always been 2 bolt. Same with a steel crankshaft they have always been cast. Last edited by ozark; 08-12-2011 at 09:51 PM.

08-12-2011, 09:42 PM	#9
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	Re: Trailering Special? All the 454s I've had came out of trucks, all were 2 bolt mains. One or two of them were in crew cab dually's, still 2 bolt. If you just got to have a 4 bolt, then splay the caps, it's stronger than a factory 4 bolt. But I think it's overkill. I had a 500+ 468, spun to 7500 quite a bit, never a problem. Was even cast crank and small rods. __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"

08-13-2011, 12:29 AM	#10
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: Trailering Special? All the pickup 454s i have seen have 2 bolt mains;the early (73-74) units seem to have forged cranks ...later ones cast ...may have been when they switched to the peanut port head. As a rule 4 bolt mains only came on square port hi perf car motors. And on the tall deck medium duty motors

08-13-2011, 12:46 AM	#11
blakeduren Registered User Join Date: Apr 2010 Location: Kansas City, MO Posts: 195	Re: Trailering Special? my 83 454 was a 4 bolt block.



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