Another BBC install!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NF65Fleetside · 06-18-2010, 02:08 PM

Sup fellas, so my lil small block is really tired and slang'n oil from only god knows where. Still running ok but I know its time to give it a rest. Ive got a lead on a stock complete 454 for a really really good price and thinking of picking it up.
My question is will it work with my 3 on the tree? Im thinking there will be interference with the linkage possibly. Also I believe I will have to upgrade to an 11" pressure plate and disc setup too yah? Now I know most will reply that the 454 will eat up the trans, I dont plan on abusing it BUT this install will be fairly temporary, so possibly the trans will stay ok with light driving and short marriage with the big block.
I plan on rebuilding the small block to mild performance status and throwing it back into the truck and then going nuts with the 454 for a future project. The 454 is basically a runner to keep me on the road while the small block is being built. Whats you guys take on this and also can the match of the 3spd and 454 be do able?

**Captainfab** · 06-19-2010, 02:26 AM

I think the 3 speed will be ok behind that 454 for a while. I know guys that have abused saginaw 3 speeds behind HP big blocks and they held up surprisingly well. I think your issue may be with the clutch bellcrank and exhaust manifold or header interference. I think it is doable, but it may take some work to get it done and working. if this is to be just temporary, and the small block will be going back in, I would look for another running small block. It would be a much easier engine swap than converting to a big block IMHO.

NF65Fleetside · 06-19-2010, 02:53 AM

well im glad to hear the 3spd being able to handle the hp/trq....seems like the only issue might be the linkage. I have swapped a 454 into these trucks before and its a direct fitment if your not doing anything extra with the motor such as taller valve covers, huge primaries off headers, etc. As for just swapping in another sbc, well thats not too fun and plus im getting a 454 for the cost of a 350 so better payoff in the end for minor headache of fitment now if any.

06-18-2010, 02:08 PM	#1
NF65Fleetside Registered User Join Date: Feb 2007 Location: Los Angeles Posts: 674	Another BBC install!!! Sup fellas, so my lil small block is really tired and slang'n oil from only god knows where. Still running ok but I know its time to give it a rest. Ive got a lead on a stock complete 454 for a really really good price and thinking of picking it up. My question is will it work with my 3 on the tree? Im thinking there will be interference with the linkage possibly. Also I believe I will have to upgrade to an 11" pressure plate and disc setup too yah? Now I know most will reply that the 454 will eat up the trans, I dont plan on abusing it BUT this install will be fairly temporary, so possibly the trans will stay ok with light driving and short marriage with the big block. I plan on rebuilding the small block to mild performance status and throwing it back into the truck and then going nuts with the 454 for a future project. The 454 is basically a runner to keep me on the road while the small block is being built. Whats you guys take on this and also can the match of the 3spd and 454 be do able?

06-19-2010, 02:26 AM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Another BBC install!!! I think the 3 speed will be ok behind that 454 for a while. I know guys that have abused saginaw 3 speeds behind HP big blocks and they held up surprisingly well. I think your issue may be with the clutch bellcrank and exhaust manifold or header interference. I think it is doable, but it may take some work to get it done and working. if this is to be just temporary, and the small block will be going back in, I would look for another running small block. It would be a much easier engine swap than converting to a big block IMHO. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

06-19-2010, 02:53 AM	#3
NF65Fleetside Registered User Join Date: Feb 2007 Location: Los Angeles Posts: 674	Re: Another BBC install!!! well im glad to hear the 3spd being able to handle the hp/trq....seems like the only issue might be the linkage. I have swapped a 454 into these trucks before and its a direct fitment if your not doing anything extra with the motor such as taller valve covers, huge primaries off headers, etc. As for just swapping in another sbc, well thats not too fun and plus im getting a 454 for the cost of a 350 so better payoff in the end for minor headache of fitment now if any.

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