DUKSRULE
1/2 ton status
I have an 87 Blazer with a blown 305. Can I replace this with a 96-99 Vortec motor? Will the intake fit the vortec heads? Any other problems I will run into?
Thanks
Thanks
CK5
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Will a TBI intake fit a VORTEC motor?
- Thread starter DUKSRULE
- Start date
89GMCSuburban
1/2 ton status
It can, but you have to take the heads and intake to a machine shop and get the heads driller for the extra bolts the manifold you're using has. Probably be cheaper just to find a non-vortec engine.
That won't work. Vortec intake ports will not line up with standard intakes.
89GMCSuburban
1/2 ton status
Hmm, Maybe that's why GM stopped selling the vortec heads drilled for older intakes..........................
Well, last I checked the newest performance heads they came out with (AL Fastburns??) still have both "old" and the Vortec intake pattern, and I'm sure I've heard of a specific intake that has enough meat as cast to port to line up with the Vortec ports.
Of course, Vortec carbed intakes are cheap and so are adapters, as long as emissions aren't a concern.
Of course, Vortec carbed intakes are cheap and so are adapters, as long as emissions aren't a concern.
A guy here at work recently swapped in a Vortec longblock into his TBI truck. GMPP sells a specific intake for Vortec heads to TBI setup. The GM one was the only one he could find available at the time, but I'm not sure how hard he looked.
89GMCSuburban
1/2 ton status
True, true. Even Edelbrock has a carb intake for vortec heads
also what vortec motor first gen or new sec gen ? first was 96-99ish and second came in siverado bodys. two total diff motors.
neverendingproject
1/2 ton status
I used a marine vortec tbi intake. Bought it on ebay. It has 2 in throttle bores but you have to get a universal throttle bracket. I would also reccomend port matching any intake you get.
Also the marine intake doesnt have EGR
Also the marine intake doesnt have EGR
there are some great articles on this
you can get the intake here(cheapest one i found when i was looking a year ago: http://www.gmpartsoutlet.com/hiperformengine.htm
they also have this to say about the exhaust manifold (hopefully the donor vortec came with a set of manifold on it though and you can use those. "Technical Notes: To use EGR, the gasses must be plumbed from the exhaust manifold into the intake manifold. Many exhaust manifolds have drilled and tapped holes that can be used to fabricate a tube. An example is the 1996 and later pickup truck with RPO L31 350 engine, which uses exhaust manifold P/N 12557828, EGR pipe P/N 10220275, and fitting P/N 12552329. That combination will fit this manifold for late model pickup trucks. Vacuum controlled EGR valve P/N 17052693 can be used on some models"
you'll also need a melonized distributor gear
and likely some goodies from turbocity to get the tbi flowing more fuel for the increased volume of air flowing through the vortec heads.
that what i got.
you can get the intake here(cheapest one i found when i was looking a year ago: http://www.gmpartsoutlet.com/hiperformengine.htm
they also have this to say about the exhaust manifold (hopefully the donor vortec came with a set of manifold on it though and you can use those. "Technical Notes: To use EGR, the gasses must be plumbed from the exhaust manifold into the intake manifold. Many exhaust manifolds have drilled and tapped holes that can be used to fabricate a tube. An example is the 1996 and later pickup truck with RPO L31 350 engine, which uses exhaust manifold P/N 12557828, EGR pipe P/N 10220275, and fitting P/N 12552329. That combination will fit this manifold for late model pickup trucks. Vacuum controlled EGR valve P/N 17052693 can be used on some models"
you'll also need a melonized distributor gear
and likely some goodies from turbocity to get the tbi flowing more fuel for the increased volume of air flowing through the vortec heads.
that what i got.
thebigdaddyof2
1/2 ton status
KW, what is a melonized distributor gear and why do you need it?
Thanks for posing up that Vortec article.
During my research, it seems that no one can agree on the max safe cam lift
on the vortec head.
Your article states .470 with .060 clearance and this article states .420 with .030 clearance.
Who's correct?
Some other Vortec discussion:
http://coloradok5.com/forums/showthread.php?t=149441
Thanks for posing up that Vortec article.
During my research, it seems that no one can agree on the max safe cam lift
on the vortec head.
Your article states .470 with .060 clearance and this article states .420 with .030 clearance.
Who's correct?
Some other Vortec discussion:
http://coloradok5.com/forums/showthread.php?t=149441
