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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 87GMC2WD on April 27, 2010, 06:35:34 am

Title: 87 350 to a 400?
Post by: 87GMC2WD on April 27, 2010, 06:35:34 am

Hey everyone,
I blew up the 350 in my 87 r1500. Now my buddy has a small block 400 that hes gonna give to me, im not quite sure of the year or anything yet cause i havent gotten the numbers. But would i be able to use the stock throttle body on that 400? or could i just get an prom made for that motor. I already have the adapter for a edelbrock intake cause thats what i had on my original 350.
Thank you,
Kyle

Title: Re: 87 350 to a 400?
Post by: choptop on April 27, 2010, 06:41:56 am

I htink it will just drop right in. Longblock for longblock

Title: Re: 87 350 to a 400?
Post by: Captkaos on April 27, 2010, 09:53:47 am

It will swap in if you have all the parts (What heads do you have on it, as TBI heads weren't like the 400 heads?)  I would probably get a chip for it due to more cubes to optimize its performace, but it should/will work.

Title: Re: 87 350 to a 400?
Post by: 87GMC2WD on April 27, 2010, 12:06:45 pm

So the 400 heads and the TBI heads are the same? they are LO5's right?

Title: Re: 87 350 to a 400?
Post by: Captkaos on April 27, 2010, 02:37:49 pm

Typo..  The are not the same.

Title: Re: 87 350 to a 400?
Post by: choptop on April 27, 2010, 07:39:48 pm

shouldnt the TBI adapter he has work on the 400 intake tho???

Title: Re: 87 350 to a 400?
Post by: 87GMC2WD on April 27, 2010, 09:02:17 pm

ok, i thought they were different heads. i have an inake for both the TBI heads and the old style heads. and the adapter will work cause its the same intake for a 350 as a 400.
Now  i either have to rebuild the stock 350 or my buddys 400. Id rather go with the 400. I would like to make it a budget rebuild but would also like some performance.

Now i have heard that the TBI LO5 heads are not as free flowing on the exhaust side as the older heads. SO if i were to rebuild a set, which ones would i gain the most performance out of in your guys opinion? I will most likely be using the stock throttle body with an upgraded prom as opposed to a carb. I have been told that the best cam to use with a TBI is the summit 1102. Opinions?

Title: Re: 87 350 to a 400?
Post by: treestandjunkie on April 27, 2010, 10:46:07 pm

The tbi heads are very restricted. I am putting some vortec heads on my tbi but you have to get a new intake also.

Title: Re: 87 350 to a 400?
Post by: 87GMC2WD on April 28, 2010, 05:58:16 pm

vortec heads are the 96- up heads?

Title: Re: 87 350 to a 400?
Post by: Captkaos on April 29, 2010, 12:00:20 am

yes

Title: Re: 87 350 to a 400?
Post by: 87GMC2WD on April 29, 2010, 06:37:28 am

so im guessing they make an intake for that to fit a carb, then i use the adapter for the TBI. Are those vortec heads good enough stock to gain some performance? sorry for all the questions, first time doing all this.

Title: Re: 87 350 to a 400?
Post by: treestandjunkie on April 30, 2010, 11:26:40 pm

They are an excellent upgrade in my opinion. I would go ahead and put performance springs on them in case you decide to put a bigger cam in later. You are right about the intake.

Title: Re: 87 350 to a 400?
Post by: 87GMC2WD on May 03, 2010, 11:30:31 am

alright sounds good. ill try and find a pair and ill let you guys know how i make out