Big Block Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71-8.5 GiMiC · 12-15-2005, 08:55 PM

Just picked up a 454 out of a 86 one ton GMC. When the time comes I would like to swap the BB into my 71 350/350.
What will I need for the swap? Can the T350 tranny stay where it is? And will it handle the extra TQ.?

Thanks.
Don

ol yellow 72 · 12-15-2005, 09:03 PM

reguards to the 350 turbo behind the big block. i say go for it, i have a 454 h.o. in my 72 with a 350 turbo behind it and its great only bout 5000 miles on it so far but those have been hard miles, numerous burn outs, racing, hand shifting, all the abuse i could do becuase the rebuilder gave me a 6 month 6000 mile warrenty so i gave it hell since the rebuild. my suggestions for running the 350 turbo witht the big block is another tranny cooler and a nice firm shift kit, and give er hell

**kwmech** · 12-15-2005, 10:42 PM

You will need the big block mounts, when you use those it will push the trans back 1''

71-8.5 GiMiC · 12-15-2005, 10:48 PM

I should be alright then, I've got both the cooler and shift kit. Thanks 72.

Luvlegs · 12-16-2005, 10:11 AM

Sorry to hijack here for a second but Ol yellow 72, do you have any pics of yours? I'm doing a 454 into my 72 here shortly - have the I6 with 3 on tree - also have 400 tranny to go behind it.... lots of info here but yours sounds like exactly what I need to see. It's spec'd at 500hp and I've not quite finished building the engine - I was told to go with a trans pack ( like $40-60 more is all) not just a shift kit (by a racing buddy) - any pics/info would be cool. Thanks

wibilly · 12-16-2005, 10:16 AM

i used the trans go kit in my vette [about $70] and love it

12-15-2005, 08:55 PM	#1
71-8.5 GiMiC Registered User Join Date: Feb 2005 Location: B.C. Canada Posts: 9	Big Block Help Just picked up a 454 out of a 86 one ton GMC. When the time comes I would like to swap the BB into my 71 350/350. What will I need for the swap? Can the T350 tranny stay where it is? And will it handle the extra TQ.? Thanks. Don __________________ 71 GMC Longhorn 70 Chevelle 73 Triumph 750 Bonnevelle Don

12-15-2005, 09:03 PM	#2
ol yellow 72 Registered User Join Date: Aug 2005 Location: kentucky Posts: 211	Re: Big Block Help reguards to the 350 turbo behind the big block. i say go for it, i have a 454 h.o. in my 72 with a 350 turbo behind it and its great only bout 5000 miles on it so far but those have been hard miles, numerous burn outs, racing, hand shifting, all the abuse i could do becuase the rebuilder gave me a 6 month 6000 mile warrenty so i gave it hell since the rebuild. my suggestions for running the 350 turbo witht the big block is another tranny cooler and a nice firm shift kit, and give er hell

12-15-2005, 10:42 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,492	Re: Big Block Help You will need the big block mounts, when you use those it will push the trans back 1''

12-15-2005, 10:48 PM	#4
71-8.5 GiMiC Registered User Join Date: Feb 2005 Location: B.C. Canada Posts: 9	Re: Big Block Help I should be alright then, I've got both the cooler and shift kit. Thanks 72. __________________ 71 GMC Longhorn 70 Chevelle 73 Triumph 750 Bonnevelle Don

12-16-2005, 10:11 AM	#5
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: Big Block Help Sorry to hijack here for a second but Ol yellow 72, do you have any pics of yours? I'm doing a 454 into my 72 here shortly - have the I6 with 3 on tree - also have 400 tranny to go behind it.... lots of info here but yours sounds like exactly what I need to see. It's spec'd at 500hp and I've not quite finished building the engine - I was told to go with a trans pack ( like $40-60 more is all) not just a shift kit (by a racing buddy) - any pics/info would be cool. Thanks __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew!

12-16-2005, 10:16 AM	#6
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Big Block Help i used the trans go kit in my vette [about $70] and love it __________________ common sense isn't so common anymore



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