Wanting to put a 454 into a 67 GMC C30 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rs74** · 02-01-2013, 10:37 PM

I have a FI 454 TBI out of a 91 C30 square that I am thinking about putting into a 67 C30. My dilema is that I don't have a harness for it. I do have the computer though. I want to stick with the FI and am not sure who I might turn to for a wiring harness. Any ideas.

**rs74** · 02-01-2013, 11:09 PM

Just looking for a plug n play type of harness that will adapt from the 454 to the 67 harness. Also I am not sure how to approach the fuel pump issue. Since the tank is behind the seat is there a pump that will go into that tank. Do I need to look at mounting one on the frame somewhere or just taking the tank out and putting in another tank underneath with a pump in it.

PanelDeland · 02-01-2013, 11:42 PM

Should be able to get a harness thru one of the companies that specialize in these swaps or LS swaps(they did TBI before they did TPI).

**rs74** · 02-01-2013, 11:53 PM

Quote:

Originally Posted by PanelDeland

Should be able to get a harness thru one of the companies that specialize in these swaps or LS swaps(they did TBI before they did TPI).

Well I wondered. Is there a company that would be recommended over another.

eldogg · 02-02-2013, 12:39 AM

Painless, Howell, Street & Performance all do harness for a TBI swap. You will need a custom chip. The pump is easy you only need 15-16psi. Ive done it with a Holley blue pump with no external regulator.
If I was doing it I would put an intake and a carb on it. A good Q-jet with have more power and get better mileage than a TBI. Trust me on this I have a TBI dually. I would also put a small cam and some headers on it. It REALLY woke up mine.

**rs74** · 02-02-2013, 12:52 AM

Quote:

Originally Posted by eldogg

Painless, Howell, Street & Performance all do harness for a TBI swap. You will need a custom chip. The pump is easy you only need 15-16psi. Ive done it with a Holley blue pump with no external regulator.
If I was doing it I would put an intake and a carb on it. A good Q-jet with have more power and get better mileage than a TBI. Trust me on this I have a TBI dually. I would also put a small cam and some headers on it. It REALLY woke up mine.

Really? I would have thought the TBI would get better mileage. Although I am not sure that 454 and mileage should be used in the same sentence. When this was in the 91 C30 it was pretty peppy and didn't have any issue breaking the dual wheel loose when gouging the gas. This engine only has 67,000 on it from factory and am just wanting that will fire up and go.

My plans if everything goes my is to convert it over to a K30 using an 84 Dana60 and 14 bolt. Probably switch to an automatic as well. I don't mind the carbs but it seem like the older I get the less I want to mess with them. I guess I am getting spoiled with all the fuel injection stuff anymore. I would like to try and squeeze every mpg out of it I can though. If that is even possible. Not sure a 6.0 or 8.1L are in the budget as of now.

daves72C10D · 02-02-2013, 07:42 AM

Quote:

Originally Posted by rs74

Although I am not sure that 454 and mileage should be used in the same sentence.

Yea, that is a good statement right there. Good luck, sounds like it will be a good swap.

**rs74** · 02-02-2013, 08:44 PM

Can I use a good inline pump and mount on the frame and still use the factory tank. I am assuming there would be sufficient pull from the pump to get fuel out of the tank.

02-01-2013, 10:37 PM	#1
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Wanting to put a 454 into a 67 GMC C30 I have a FI 454 TBI out of a 91 C30 square that I am thinking about putting into a 67 C30. My dilema is that I don't have a harness for it. I do have the computer though. I want to stick with the FI and am not sure who I might turn to for a wiring harness. Any ideas.

02-01-2013, 11:09 PM	#2
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: Wanting to put a 454 into a 67 GMC C30 Just looking for a plug n play type of harness that will adapt from the 454 to the 67 harness. Also I am not sure how to approach the fuel pump issue. Since the tank is behind the seat is there a pump that will go into that tank. Do I need to look at mounting one on the frame somewhere or just taking the tank out and putting in another tank underneath with a pump in it.

02-01-2013, 11:42 PM	#3
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: Wanting to put a 454 into a 67 GMC C30 Should be able to get a harness thru one of the companies that specialize in these swaps or LS swaps(they did TBI before they did TPI). __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

02-02-2013, 12:39 AM	#5
eldogg Registered User Join Date: May 2007 Location: Mooresville NC/Gainesville GA Posts: 499	Re: Wanting to put a 454 into a 67 GMC C30 Painless, Howell, Street & Performance all do harness for a TBI swap. You will need a custom chip. The pump is easy you only need 15-16psi. Ive done it with a Holley blue pump with no external regulator. If I was doing it I would put an intake and a carb on it. A good Q-jet with have more power and get better mileage than a TBI. Trust me on this I have a TBI dually. I would also put a small cam and some headers on it. It REALLY woke up mine. __________________ Eric Evans Queen City Shop Truck http://67-72chevytrucks.com/vboard/s...34#post6139834 66 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=543110

02-02-2013, 08:44 PM	#8
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: Wanting to put a 454 into a 67 GMC C30 Can I use a good inline pump and mount on the frame and still use the factory tank. I am assuming there would be sufficient pull from the pump to get fuel out of the tank.

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