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Old 02-24-2013, 09:46 AM
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94 vortec in a 98 Z71

Have a rebuilt 94 5.7 to put in my 98..does anyone have a 94 timing cover to accept a crankshaft sensor and reciever or what is another way around this issue??

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Old 02-25-2013, 09:16 AM
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To use your 1994 TBI engine in the 98, you will need a 1996-2000 Vortec 305/350 front timing cover that holds the crank positions ensor, you will also need to instal the 4 x reluctor wheel from a 96-2000 Vortec L30/305 or L31/350.
because of the extra width the relcutor wheeel takes up you will need to use the Vortec 305/350 damper as its narrower, or machine down another damper.
Front timing cover part numbers
12523972, 12523973, 12558343, 12562818, 93800970
Dorman pn 635505 cost is $19.15.

GM crank position sensor $52
12562910, 12596851, 213946

STANDARD MOTOR PRODUCTS Part # PC123T $36.00

4x reluctor wheel
GM 10190917 $9.97

The plastic Vortec front timing cover has fewer bolt holes than teh 12 bolt TBI front timing cover, the bolt hoiles that are present do line up. You may need siliicone up some areas to prevent leaks.

peace
Hog
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Old 02-25-2013, 09:18 AM
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Quote:
Originally Posted by DavidW View Post
Have a rebuilt 94 5.7 to put in my 98..does anyone have a 94 timing cover to accept a crankshaft sensor and reciever or what is another way around this issue??
A 94 is not a Vortec, it is a Swirl Port with TBI (Throttle Body Injection). The 98 injection will not fit unless the 94 block has L31 Vortec heads on it.

The front timing cover from the 98 will fit the 94 with minor fiddling. The 94 crank must also have the 98 crank damper assembly which is carrying the needed tooth for the crank angle sensor in the 98 timing cover. The plastic timing cover may not close over the 94 timing set. The Vortecs use their own timing set for the roller cam which is narrower to fit behind the shallow plastic timing cover.

I'd mock this up using your old 98's timing cover and crank damper assembly before making commitments to the timing set.

Bogie
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Old 02-25-2013, 10:40 AM
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Hogg, bogie
thanks guys you all saved the day, i do have the vortec heads i had rebuilt from the 98 and all the timing parts....the sounds of these answers are that I can not use a double roller is this correct unfortunatly i have already installed it but it looks like i will be going back to get a single ... thanks a million guys
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Old 02-25-2013, 12:48 PM
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People have used double rollers under theh stock plastic front timing cover, but you have to fab up a spacer to space the reluctor away from the chain.



There is a timing set that was used for the LT4 Vette engine. It had a stock rev limit of 6412 rpm. I remember the 3 piece kit being cheaper than buying the 3 seperate component by quite a bit of money.

chain 14088783 $51.94 Chevrolet Performance 14088783 - SummitRacing.com
crank sprocket 14088784 $69.95 http://www.summitracing.com/parts/nal-14088784
cam sprocket 12552129 $37.95 Chevrolet Performance Camshaft Timing Sprockets 12552129 - SummitRacing.com


Or the whole kit for $57.95, instead of $159.84 bought seperately. These parts are also used on most of the GMPP crate engines, ZZ4, 330HO, ZZ430, ZZ385, ZZ383, HT383, HT383E etc etc. p/n
12371043
http://www.summitracing.com/parts/na...1043/overview/

Here is a pic of the kit.



peace
Hog

Last edited by Hogg; 02-25-2013 at 12:54 PM.
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