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#1
03-05-2004, 11:13 PM
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Hello , I just bought a 71 T-37 with the 350 2 barrell carb , but the motor is froze and I have a chance to buy a 428 motor fairly cheap and I was wondering how much trouble itwould be to interchange these motors , like will I need a different tranny or motor mounts or what. I am trying to figure out what would be best , or if I just should rebuild the 350. If anybody has any suggestions or thoughts it would be greatly appreciated. I am new to this site for about the last 2 weeks and I really like it . Thanks, Jeff
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#2
03-05-2004, 11:13 PM
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Hello , I just bought a 71 T-37 with the 350 2 barrell carb , but the motor is froze and I have a chance to buy a 428 motor fairly cheap and I was wondering how much trouble itwould be to interchange these motors , like will I need a different tranny or motor mounts or what. I am trying to figure out what would be best , or if I just should rebuild the 350. If anybody has any suggestions or thoughts it would be greatly appreciated. I am new to this site for about the last 2 weeks and I really like it . Thanks, Jeff
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#3
03-05-2004, 11:18 PM
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The 428 will bolt right in using your current engine mounts, transmission, exhaust and accessories. There may be a bolt hole missing on the front of the cylinder heads for accessory mounting but this is not a big problem. Pontiac engines are all the same size externally (except the 265/301 economy engines).
 Forget about that 350, you now have a 428.  ------------------------------ My wife says I never listen to her, at least that's what I think she said.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#4
03-05-2004, 11:25 PM
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great ,thats what I was hoping to find out.Thanks for your reply , I'm sure I will be asking a lot more questions later on. I'm hoping to get started on this car in the next few weeks . Thanks again.
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#5
03-05-2004, 11:33 PM
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Yeah it is pretty straight forward, but if you can get the brackets and accessories along with the 428 it would help. That missing bolt hole on the head is where the 71 up alt. and ps pump pivot bolt goes into, 70 and older brackets and pulleys and ps pump would make the swap much easier.
 1970 GTO with 428 1985 Cutlass with 455 olds
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 1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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#6
03-05-2004, 11:35 PM
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Another detail: Be sure to use the timing cover, water pump and crank damper/balancer from the '71 350 on your 428 to make sure the accessories bolt up and line up properly.
428s were built only from '67 through '69 and there were several different timing covers, balancers and water pumps used during those years that won't match up with your '71 stuff.  ------------------------------ My wife says I never listen to her, at least that's what I think she said.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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