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Thread: Needing tech help on restoring a 1974 Apollo Engine

  1. #1

    Needing tech help on restoring a 1974 Apollo Engine

    Team
    I have a 1974 Buick Apollo Hatchback with a V8 350 2 BBL Engine, that I am starting to restore. I first need to know how to change the 350 2 BBL to a 350 4BBL? I already have the 4BBL stock intake, now do I need to change the Cam, Heads, Piston.....Etc? My next question is the identifing label under the hood say,s BB 350CU IN 2BBL, GM401-2 and this Engine small block?
    Last edited by ralph witzell; 10-23-2015 at 08:04 AM. Reason: to get a better response

  2. #2
    Join Date
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    The engine is a small block. You don't have to change anything but the intake and carb to make it a "350-4". Unbolt your existing 2 barrel intake, clean the sides of the heads and the valley rails, install a new gasket and properly tighten down the 4 barrel intake and install the carb, modify the fuel line and go. Obviously you will need a 4 barrel air cleaner. It would be nice if you could come up with the quadra jet that came on the intake from the factory so that you wont have a lot of problems with the choke and throttle linkages. Job should be a piece of cake. Good luck.

  3. #3

    Apollo Engine

    Thank you for your help. Any tips on increaseing the horse power?

  4. #4
    The key to making big power on the 350 is the head porting! The stock cams SUCK as well so upgrade that for sure as well as the lifters, timing chain and gears. Take the heads off have them ported, but you will need a nice cam like a Lunati that makes power from 2000-5500 rpm. The stock intake is fine for idle to 5500 rpm but even with head porting the intake becomes the restriction over 5500. For the street this is fine, just build for this rpm range.

    This is however the reason I had Mark Burton (look for him in the vendors section on V8Buick.com) build me a custom single plane intake for me which will let the heads breath to 7500 rpm if all goes well.

    I used a 77 Buick 350 rated at about 160 hp and using forged pistons 8.3:1 compression, home ported heads, poston alum intake also ported, and ended up at 398 hp at 5600 rpms. I was going to turbo-charge that engine but have since upgraded everything and plan to make over 450 hp NA and boost the snot out of that with twin turbos and nitrous as well.

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