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1995 heads #745581
February 23rd 2019 9:44 am
February 23rd 2019 9:44 am
Joined: Aug 2018
Posts: 83
Pennsylvania
D
Dw89xj Offline OP
journeyman
Dw89xj  Offline OP
journeyman
D
Joined: Aug 2018
Posts: 83
Pennsylvania
Is there any truth to the story that some of these 95 tbi vans slipped through with vortec heads? It seems a bit far fetched to me considering that they would change tooling for possibly a couple thousand or so custom tbi to vortec intakes? Or change tooling to drill and tap a few sets of heads out of thousands and thousands of the same casting. Any thoughts on this are welcome, if it is true I'd like to see proof though, not s rebuilt engine someone put vortec heads on but a real deal from the factory 1995 tbi with vortec heads.


98 Dodge shorty hitop mark iv
95 Chevy van 20 regency hitop conversion van
Re: 1995 heads [Re: Dw89xj] #745584
February 23rd 2019 10:27 am
February 23rd 2019 10:27 am
Joined: Sep 2005
Posts: 8,680
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,680
Georgia, USA
Never saw a '95 Vortec 5.7. Would be nice if they did since we own a late production '95 G20 conversion. But it's not Vortec.
Although some of the late '95 Chevy/GMC vans were sold as '96s. They were almost always G20/G30's and mostly aftermarket conversions and/or utility vehicles such as ambulances. It was not too uncommon to see a G30 extended being sold as a '96 because that's what the paperwork labeled it. Most of those were beat to death as work vehicles.


Last edited by CatFish; February 23rd 2019 10:35 am.


How come you never see a headline saying ‘Psychic Wins Lottery?


Re: 1995 heads [Re: Dw89xj] #745585
February 23rd 2019 10:28 am
February 23rd 2019 10:28 am
Joined: Mar 2011
Posts: 330
NY
J
jcd74 Online content
enthusiast
jcd74  Online Content
enthusiast
J
Joined: Mar 2011
Posts: 330
NY
It's not about GM doing extra machining to make them fit, it's about running out of old parts they no longer want to use. 95 was a transitional year like 83. Look at the born on date at the drivers door jam, was it made in 94 or late 95? There is no telling when they ran out of old engines, only they know that. If made in late 95 it may be possible. The vortec has 4 bolts a side, the earlier heads have 6. Look for the triple hump casting at the end of the heads (front- back).

Re: 1995 heads [Re: Dw89xj] #745614
February 24th 2019 11:33 am
February 24th 2019 11:33 am
Joined: Nov 2013
Posts: 3,169
Michigan
Dyno_Dave Offline
pooh-bah
Dyno_Dave  Offline
pooh-bah
Joined: Nov 2013
Posts: 3,169
Michigan
While I don't "know", my gut is no, not possible from the factory.

GM Powertrain is as interested as any business in wisely using up old stock, and minimizing scrap.

But yes, intakes are different. GM did not tool up and cast TBI injection intakes to Vortec heads prior to the introduction of Vortec heads. While it would later become a popular conversion, never happened in production. Even IF they had the intakes, and they ran out of swirl port heads (why would this happen?), they would not be able to sell the combo due to lack of emissions and MPG testing. The Govt. puts the modern manufacturer through all kinds of hell to get certification of these engine combinations for emissions. Then the potential change in MPG numbers, which are CLOSELY monitored for CAFE.

If you were asking me if this could happen in 1965, I'd day yes. And we see many items from the muscle car era that were not supposed to be, but did happen. But not by the '90s. [Linked Image]

Re: 1995 heads [Re: Dyno_Dave] #745620
February 24th 2019 6:09 pm
February 24th 2019 6:09 pm
Joined: Aug 2018
Posts: 83
Pennsylvania
D
Dw89xj Offline OP
journeyman
Dw89xj  Offline OP
journeyman
D
Joined: Aug 2018
Posts: 83
Pennsylvania
These are the thoughts I also had when being told this. But I didn't want to just blurt out "yeah right".


98 Dodge shorty hitop mark iv
95 Chevy van 20 regency hitop conversion van

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