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#1 |
Registered User
Join Date: Sep 2016
Location: Channahon, Illinois
Posts: 1
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1972 GMC 402 swap to 454 clutch arm
Doe someone make a conversion kit to mount the clutch arm to the block? The 402 block was drilled and tapped for the ball bracket and the 454 is not. Is there a kit to bolt on?
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#2 |
Registered User
Join Date: Jul 2011
Location: strausstown pa
Posts: 3,394
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Re: 1972 GMC 402 swap to 454 clutch arm
Bb's are usually drilled and tapped. But not allways huh.
My 400 sbc wasnt drilled either. i needed too use a small roloc too flatten out the bolt bosses since they were rough not flat and as casted. I used the oe ball bracket for locateing and center punching the holes. Then a mike too measure the depth of the holes in the other block. set my bit stop collar and slowly oiled and drilled them in 3 steps till i was at the correct depth&dia. Then Tap it out useing cutting oil.a bottoming tap works best. Slightly intimadating job but it went very easy. those bb ball stud brackets are a tough find if you need them.
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81 camaro 355 4/spd 342 posi my first love ![]() 67 swb step 454/4spd ott 373 posi 4/7 drop. 2000 s10 zr2 little blue truck that never gets stuck. '74 heald super bronc vt8. tecumseh powered moon rover. |
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#3 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: 1972 GMC 402 swap to 454 clutch arm
Yes, Skogin Dickey Parts Center makes a bracket that mounts it to the bellhousing bolts, but it's not perfect in terms of location. Other solutions (brackets) are available too.
If you can drill and tap the block, do that. Hard to do in the car but outside the car it's the way to do it.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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