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#1
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80 GP 3.8 to Pontiac 400 conversion
Have someone I work with has a 1980 GP with a 3.8 and auto and is wanting to put in a Pontiac 400. Anyone have any experience with this conversion, that can pass on some info what will be needed to complete it. He just bought a 400, but not sure yet what year it might be. Thanks
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#2
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Get both sets of mounts from a 301 and as long as the 400 is a 70 up and it's a bolt in. I would upgrade to a Turbo 350 transmission as you don't have to change the driveshaft.
I did this conversion on my 85 Grand Prix.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
#3
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The only other minor thing I can think of not already covered is Battery placement, the Buick and Chevy powered G-Bodies mount the battery on the passenger side, as the Pontiac V8 has the starter on the other side the battery is usually mounted on the drivers Side. And Fuel Line size, the V6 Fuel line is usually a smaller Tube than the V8 Fuel line.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
#4
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Appreciate the feedback, I will pass it on. I gave him some miscellaneous parts he will need, as well as he got on a G body forum, as was able to have contact with a couple of members there, and will help him with some of the parts I did not have for him. He was not a Pontiac guy to start, but I think he is coming around. I applaud he is going the Pontiac motor route in instead putting a chevy in it.
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