6066 (1960-1966) GMC Truck Club

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- Toro Flow Diesel Engines (https://6066gmcclub.com/forumdisplay.php?f=21)

- - D478 Toro Flow (https://6066gmcclub.com/showthread.php?t=51865)

GMCAUS

September 5th, 2025 02:25 AM

D478 Toro Flow

Hey all would anyone happen to know the specs of the Toro Flow D478 head bolts?

BobBray

September 6th, 2025 06:33 AM

Re: D478 Toro Flow

Quote:

Originally Posted by GMCAUS (Post 79016)

Hey all would anyone happen to know the specs of the Toro Flow D478 head bolts?

The torque is 125-135 ft. lbs.. There are 14 head bolts in each head, all are 9/16-12. 5 4-61/64" long (part #2448983), 6 1-55/64" long (part #2448973), and 3 3-61/64" long (part #2453406).

GMCAUS

September 6th, 2025 08:19 AM

Re: D478 Toro Flow

Quote:

Originally Posted by BobBray (Post 79017)

The torque is 125-135 ft. lbs.. There are 14 head bolts in each head, all are 9/16-12. 5 4-61/64" long (part #2448983), 6 1-55/64" long (part #2448973), and 3 3-61/64" long (part #2453406).

Thanks for your help mate. you do you know if the bolts are torque to yield or if they are reusable?

BobBray

September 7th, 2025 02:37 AM

Re: D478 Toro Flow

I believe they are reuseable.

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