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#1 |
Registered User
![]() Join Date: Aug 2003
Location: canyon country, ca, USA
Posts: 336
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96-98 chevy/gmc trucks and 96-99 full size vans have the vortec engine. i have heard to get the 062 casting heads rather than the 906 castings because the 906s don't flow as well on the exhaust side. i know a guy that does cylinder head porting and said it's boloney.check out recyler.com for local deals. most of the intake gasket failures are related to overheating.
you probably already know a properly tuned q jet will perform like fuel injection; smooth and reliable with great economy. if you really plan on keeping the 350 trans, consider swapping out the gears in your rear to some numerically lower.
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#2 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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96+ Vortec 5.7 in my 71 Cheyenne
For various reasons (which I won't bother going in to), I need to convert my truck to squeeze as much fuel mileage out my truck as possible.
I am currently running a rebuilt (by me) 350 with vortec heads and L98 Vette cam grind and RPM performer intake and 750DP, and TH350. I've considered just putting in a OD tranny, but after much soul searching, I've decided to transplant with a 5.7 Vortec out of a 96+ chevy truck or sub. I've searched through pages and pages here and found a little info, but nothing really substantial. I have no problem with the conversion, it should be as close to bolt on as can be (done an LT1/T56 in my 240Z , as well as many other conversions). What I am looking for is info on any particular issues with engines that I should look for....reliability issues (I saw something about intake gaskets), any idiocincracies with the engine/tranny that I should be on the lookout for. Thanks, Tim
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#3 |
Registered User
Join Date: Feb 2001
Location: USA
Posts: 2,613
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If your replacement engine had orange antifreeze in it- replace all the gaskets that contacted that crap.
How much MPG increase do you expect to get ? |
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#4 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Right now I get about 10 with a tailwind....hoping for 15-18 on the freeway.
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#5 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
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I've head of 20+ with a newer model fuel injected engine (LS1 style) and a 4L60E transmission properly tuned.
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