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Old 07-09-2013, 11:26 AM
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TBI-Vortec swap Q's.

Pretty sure my truck now has a couple burned valves cause it runs pretty bad. brakes feel weird so I think there is a vac issue/ valves.. It was run with no exhaust on the passanger side for a few weeks and I know that was hard on it, and then it was parked which should not have done anything but it runs worse now.

4 bolts ( all end bolts ) broke in the heads when the headers ( bolt up replacement shorty headers ) were put on when the exhaust was repaired ( stock exhaust except headers ). So heads really have to come off anyway tho the headers seal for now.

I'm considering getting a set of rebuilt 305 Vortec heads for $200 ea, The TBI- Vortec intake manifold and welding a bung into the header collector for the EGR. My issue, is the cheapest I can get the TBI-vortec intake is 10% discount off of $369 using Summit's price match against Jegs.. An Edelbrock performer Vortec or Summit version with a TBI adapter will work just fine, except the EGR. Is their any way to get EGR into the non EGR vortec manifold? I'm thinking an old Ford 4bbl EGR spacer that used an external EGR with a pipe to the exhaust manifold, then use the Ford EGR as the TBI is vac operated as the old Ford is. Will that work?

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Old 07-09-2013, 12:26 PM
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Quote:
Originally Posted by matt167 View Post
Pretty sure my truck now has a couple burned valves cause it runs pretty bad. brakes feel weird so I think there is a vac issue/ valves.. It was run with no exhaust on the passanger side for a few weeks and I know that was hard on it, and then it was parked which should not have done anything but it runs worse now.

4 bolts ( all end bolts ) broke in the heads when the headers ( bolt up replacement shorty headers ) were put on when the exhaust was repaired ( stock exhaust except headers ). So heads really have to come off anyway tho the headers seal for now.

I'm considering getting a set of rebuilt 305 Vortec heads for $200 ea, The TBI- Vortec intake manifold and welding a bung into the header collector for the EGR. My issue, is the cheapest I can get the TBI-vortec intake is 10% discount off of $369 using Summit's price match against Jegs.. An Edelbrock performer Vortec or Summit version with a TBI adapter will work just fine, except the EGR. Is their any way to get EGR into the non EGR vortec manifold? I'm thinking an old Ford 4bbl EGR spacer that used an external EGR with a pipe to the exhaust manifold, then use the Ford EGR as the TBI is vac operated as the old Ford is. Will that work?
Is this a Swirl Port TBI truck, last production year 1995, or a 1996 up so called Vortec with MPFI. Or a 96 big van with the Vortec engine and TBI?

These are all different as EGR valve which needs to be complatible with the operating system that controls it. The Ford EGR uses a different mounting foot print from the GMs and the GMs will be different with year and type of injection system.

Bogie
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Old 07-09-2013, 01:55 PM
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It's a 1995 K1500 with factory TBI and swirl port heads.. The EGR is vac controlled just like the old Ford. 1996 came with the electronic EGR, tho the ECU in my '95 can still know if the EGR is working or not.

The old Fords used an EGR carb adaptor/ riser which took EGR gases from the exh manifolds and routed them to the intake under the carb. Edelbrock makes new EGR adaptors tho I think I still have 1 off of my '75 460 I can use if it would work... The only way I know it will work is with the TBI- Vortec intake which GM engineered for the swap and it has exhaust gas plumbed from the exhaust manifold/ header to a pocket on the cylinder head where the stock '95 EGR can mount. I'm just considering, if I can use an EGR carb plate that I arleady have ( $59 if I needed a new 1 ) and a $25 EGR for an old Ford, I can save a ton by using a $160 intake instead of a $360 intake
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Old 07-09-2013, 02:31 PM
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These are the heads I was thinking of. Remanufactured Chevrolet GMC 5.0 Liter 305 Vortec OHV V8 Cylinder Head
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Old 07-09-2013, 04:20 PM
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Is your engine a 305 or 350?
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Old 07-09-2013, 04:22 PM
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305.. Other option I have been tossing around is a 4.8L Vortec swap. rough cost addition, it is close.
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Old 07-09-2013, 04:39 PM
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Those heads are not gonna be a whole lot better than what you already have.I realize you need heads,but,if you are doing this swap to increase power,idk that the costs will justify the gain considering a new intake & other costs associated with the swap.The 305 Vortec heads are not true fastburn heads like you find on the 350.Swapping to Vortec heads on a 350 can gain as much as 30 to 40 HP.You won't see those kinda gains on a 305 swap.If you are gonna do an engine swap,i'd either go 350 or 5.3 considering the work involved.With a 4.8 or 5.3 you will need everything including PCM,wiring harness,all sensors,etc.With a 350 swap,most of your current stuff can be used.
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Old 07-09-2013, 05:25 PM
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Concern with 5.3L is cost. They are at least +$2-300 for engines with higher miles. I can find clean 4.8's complete with wiring, accessories and airbox for $600, but it's $8-1,200 for a simmilar cond 5.3L. Also my truck is a 5spd NV3500 truck, which never came with the 5.3L but did on the 4.8L.. Also 285hp/ 290ft/lbs is still an upgrade over the 160hp/200ft/lb 305 that is in it.
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Old 07-09-2013, 06:16 PM
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The L30 vortec heads do not have the vortec-style combustion chamber, but they do have vortec-style tall and narrow ports and an open non-swirl style bowl. They are a vast improvement over any TBI head.
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Old 07-10-2013, 09:13 AM
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That's what I have heard about them.. I even tried to locate TBI heads and they are more expensive than the Vortec 305 heads. I could have my heads rebuilt for $20/valve, so $320+ tax but the only engine machine shop around is Napa and the machinist while very good has gotten very slow. Friend of mine who owns a shop and buys their parts every day waited 11 months for his 350 block.

What about using a 416 head with a Holley Projection ( TBI ) manifold for the '55-'86 intake bolt pattern?

Last edited by matt167; 07-10-2013 at 09:24 AM.
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Old 07-10-2013, 11:08 AM
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The 416's are better than the swirl port & won't need an intake upgrade.The L30's would be better.I didn't mean in the previous post that weren't any good.I just wanted to be sure you weren't confusing that swap with the 350 swap & expecting the same gains.Either way you go,you will need to have some tuning done to get the full potential.
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Old 07-10-2013, 12:08 PM
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I figure, if I have to pull heads to fix it, it would not hurt to try to get a little extra out of it.. Little reading and the 081 305 TPI heads are the same as the 416 heads just with the '97-'95 intake pattern so it will fit and work with what I have. This truck is a '95 K1500 5spd extended cab with a long bed. Not an easy truck to find, so I'd rather keep it going than replace it. Also when it's running well, I can get 20 MPG out of it

These heads look ok? Ready to Install 1987 1988 1989 1990 1991 1992 Chevy 305 Cyl Head Cast 081 | eBay. At that price, it's only slightly more than having my TBI heads reworked
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Old 07-10-2013, 12:43 PM
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IDK much about the 081.If he charges $38 shipping on ea head,that's gonna put you well over $400 on a set.
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Old 07-10-2013, 01:19 PM
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416 or 081 are said to be the same head, just the 081 was used '87-'93 and thus has the '87-'95 intake bolt pattern.. I know that it would be over $400/set but it would still most likely be comparable to having my heads redone at $320+ parts

Edit, found Allied Motor Parts selling 416's for $124/ ea and 081's for $149/ea. Shipped to my house would be $404 to my door for 081's.. ~$50 less for the 416's but I would need a different intake and valve covers.

Last edited by matt167; 07-10-2013 at 01:46 PM.
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Old 07-10-2013, 02:02 PM
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I guess it would still be cheaper goin that way instead of the Vortecs & havin to buy an intake.How many miles on the engine now & what shape is your bottom end.If excessively worn,you could have problems by putting a fresh top end on.If it's still in good condition,or,low miles,you should be OK.
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