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Jan 21st, 2020
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 What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Apr 2005
Posts: 376
OP
Shop Shark
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As the title says. Thanks for your help!!!
Marv.
Last edited by marvin ribbich; Wed Oct 28 2020 10:42 AM.
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Feb 2016
Posts: 440
Shop Shark
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Any Chevy V8 will bolt up, you need the correct bell housing to match the SM420, mine is the original 283 V8 and SM420, all of the Chevy V8's have the same bolt pattern for the trans/bell housing - even my 2000 K3500 6.5 diesel is the same.
Last edited by 78buckshot; Wed Oct 28 2020 11:59 AM.
1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Nov 2005
Posts: 5,825
Master Gabster
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Hy marvin ribbich, as 78buckshot has said it is more a matter of having the correct bellhousing to mate any engine to any transmission. In the mid fifties heavier trucks manufactured by Chevrolet and GMC could come equipped with Buick, Chevrolet, Oldsmobile and Pontiac V8 engines As the mounting bolt pattern of the SM420 transmission is shared by many transmissions I would think that there are many non GM engines that could have an SM420 transmission bolted up to them. Hope that helps.
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Jun 2011
Posts: 3,773
Shop Shark
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Also all GM inline 6 cyl. Engines. Some BOP bellhousings come with 420 bolt pattern.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Nov 2020
Posts: 4
Moderated
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Will a 1966 gmc k1000 v6 305e bell housing bolt up to a SBC. Try to convert my v6 to a 350. And add power steering
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Feb 2004
Posts: 21,577
Boltergeist
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No, the V6 bellhousing bolt pattern is different than the V8's. You might have one of the "SAE" style round bell housings on the 350, depending on which transmission you have. There are SAE bellhousings that fit the GM V8's which would adapt them to your transmission, however. Your checkbook is going to need some CPR- - - - -they're scarce and expensive!
Jerry
The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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Re: What V-8 Engines Mates Up To A SM420 Trans??????
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Joined: Nov 2020
Posts: 4
Moderated
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Thanks I have read various articles both ways saying yes and no. My v 6 bell housing is rounded and has the 11 inch clutch, and the transmission is the SM 420 manual 4 speed. Do you know what SAE bell housing I would need and if I can get that housing would the rest of the drive train bolt up, and can I use my original fly wheel
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