1986 305 intake replacement

Lyn Smith · 12-30-2017, 03:11 PM

Is there any trick to putting a 60s cast iron intake on a 1986 305 engine that has the stock heads?Just picked up a 86 305 less intake.thanks and Hope Everyone has a Great New Year.

BillK · 12-30-2017, 05:53 PM

86 was right about the time GM started changing the angle on the center 4 bolt holes to clear the Throttle body on the TBI engines. If those four holes are 90 degree to the head then your old manifold will bolt right on. If the four center holes are tilted slightly you can "modify" the four center bolt holes in the intake to get the bolts to fit. Edelbrock makes some angle spacers to help but I have done a couple without using them and it worked fine.

Lyn Smith · 12-30-2017, 06:07 PM

Thanks for the info Bill.Yes this engine had a TPI induction system on it,but it was removed before I purchased it.I want to put a1965 afb intake on it,with a edelbrock afb style carb.So I can just elongate the center holes and it should work?

BillK · 12-30-2017, 08:20 PM

Quote:

Originally Posted by Lyn Smith

Thanks for the info Bill.Yes this engine had a TPI induction system on it,but it was removed before I purchased it.I want to put a1965 afb intake on it,with a edelbrock afb style carb.So I can just elongate the center holes and it should work?

That should do it.

Buick6 · 01-04-2018, 06:09 PM

I thought they changed the center bolt holes around 1987? If you want one of the factory aluminum intakes (14101074), I have a nice one already cleaned up and ready to bolt on. It is for a quadrajet.

BillK · 01-05-2018, 08:39 AM

Quote:

Originally Posted by Buick6

I thought they changed the center bolt holes around 1987? If you want one of the factory aluminum intakes (14101074), I have a nice one already cleaned up and ready to bolt on. It is for a quadrajet.

There are a couple of mixed years. if the engine came with Throttle Body Injection it had the different angle center bolt holes but some 86 and maybe 87 Trucks still had Qjets and I dont think they had the different bolt angle.

Either way the older intakes will work with just a little modifying of the center bolt holes. It sounded like Lyn wanted to keep the old school look.

Ed Wright · 01-06-2018, 02:03 PM

1987 GM trucks had Throttle Body EFI, 1986 was the last year for carbs.

12-30-2017, 03:11 PM	#1
Lyn Smith VIP Member Join Date: Dec 2001 Location: Pontiac,il. Posts: 1,203 Likes: 284 Liked 977 Times in 196 Posts	1986 305 intake replacement Is there any trick to putting a 60s cast iron intake on a 1986 305 engine that has the stock heads?Just picked up a 86 305 less intake.thanks and Hope Everyone has a Great New Year.

12-30-2017, 05:53 PM	#2
BillK Member Join Date: Nov 2005 Location: Waldorf Md Posts: 230 Likes: 12 Liked 30 Times in 17 Posts	Re: 1986 305 intake replacement 86 was right about the time GM started changing the angle on the center 4 bolt holes to clear the Throttle body on the TBI engines. If those four holes are 90 degree to the head then your old manifold will bolt right on. If the four center holes are tilted slightly you can "modify" the four center bolt holes in the intake to get the bolts to fit. Edelbrock makes some angle spacers to help but I have done a couple without using them and it worked fine. __________________ Bill Koustenis

12-30-2017, 06:07 PM	#3
Lyn Smith VIP Member Join Date: Dec 2001 Location: Pontiac,il. Posts: 1,203 Likes: 284 Liked 977 Times in 196 Posts	Re: 1986 305 intake replacement Thanks for the info Bill.Yes this engine had a TPI induction system on it,but it was removed before I purchased it.I want to put a1965 afb intake on it,with a edelbrock afb style carb.So I can just elongate the center holes and it should work?

01-04-2018, 06:09 PM	#5
Buick6 Junior Member Join Date: Feb 2015 Location: Florence, SC Posts: 84 Likes: 16 Liked 16 Times in 7 Posts	Re: 1986 305 intake replacement I thought they changed the center bolt holes around 1987? If you want one of the factory aluminum intakes (14101074), I have a nice one already cleaned up and ready to bolt on. It is for a quadrajet.

01-06-2018, 02:03 PM	#7
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: 1986 305 intake replacement 1987 GM trucks had Throttle Body EFI, 1986 was the last year for carbs. __________________ Ed Wright 4156 SS/JA