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#1 |
Registered User
Join Date: Dec 2014
Location: portland oregon
Posts: 292
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1961 sm420 to zz4 crate motor
im looking to buy a zz4 crate motor for my truck and want to keep the sm420 trans, I know ill need to source a flywheel and clutch for that year of motor and possibly a starter as well, but what about pilot bearing or whatever else....has anyone here done a 1 piece rear engine and retained the sm420 trans??
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1961 c10 longbed - gone 1964 c10 swb |
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#2 |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: 1961 sm420 to zz4 crate motor
I think I have what you're looking for in my vast archive of semi-valuable parts stash. PM me
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#3 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 1961 sm420 to zz4 crate motor
Do they still sell the ZZ4? I know GM is up to a ZZ6 now.
I am assuming you are keeping the stock bellhousing? If so, you are stuck with the bellhousing mounted starter. Just get the high torque version. You'll need a 168 tooth flywheel for a one piece rear main seal small block. Then just a good quality 11" clutch. Nothing special for a pilot bearing, just a standard bronze pilot bushing
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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 |
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#4 |
Registered User
Join Date: Dec 2014
Location: portland oregon
Posts: 292
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Re: 1961 sm420 to zz4 crate motor
captain....no the zz4 isnt mass produced anymore...but since my 383 build kinda took the low road...ive decided to find another option....found a good zz4 locally with only 30k miles complete carb to pan for just over a grand...plans now are to upgrade the heads and cam and shoot for an honest 400hp
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1961 c10 longbed - gone 1964 c10 swb |
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#5 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 1961 sm420 to zz4 crate motor
That's a decent deal for $1K. I believe the new ZZ6 puts out 405hp? The shortblock is the same, just the better Fastburn heads and a bigger/better cam.
__________________
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 |
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