Hey everyone. I'm building a 350 shortblock. I have a double roller timing chain with a 3 way crankshaft sprocket. It's installed on the crank "straight up" in other words, the woodruff keys arent in the "A A A" or "R R R" slots. When I line up the dots with cam gear the #1 piston is only about 3/4 of the way up in the bore. Isnt it supposed to be ALL the way up ? Is that normal ? Thanx

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1991 Z28 6.0 TPI

360 4 bolt main block, TrickFlow 23 degree heads, CompCams CS270HR cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, 2500 stall, bullet proof 700R4, aluminum driveshaft...

 

That doesn't sound right at all.

The keyway itself is exactly aligned with the #1 & #2 crank throw. So the dot you should use will be exactly 45° "behind" the keyway. If you install the cam gear so that the dot is down (i.e. the 2 dots are together) you will be at the other instance of #1 TDC besides #1 firing, namely #6 firing.

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"So many Mustangs, so little time..."
ICON Motorsports

 

You must be using the wrong dot for the slot you've chosen. Bring the #1 piston all the way to the top of the cylinder. The dot you should use will be at the top.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

[This message has been edited by five7kid (edited October 08, 2001).]

 

??? Are you sure you're looking at #1 and not #2? Make sure you don't get confused looking at the engine backwards or something. Even if you were using A or R, that only advances or retards it something like 2 to 4 degrees. That wouldn't put the #1 piston that far down. If you're sure it's #1 you're looking at and that the cam dot is pointing down and the crank dot pointing up then something is seriously wrong. Check to make sure the crank key and gear are installed correctly. Then check all your parts, like the gears and the cam, to make sure you didn't get a wrong part.

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91 Z28
Come see The Vicious...

 

RB and five were right. Although before they responded I did get the idea to look at the old sproket and see where the dot is in relation to the woodruff keys. It turns out the sprocket that I'm currently using has two dots and I was on the wrong one. No biggie I just took the chain off and rotated the sprocket a little to aling with the other dot. Now everything is in order and #1 is ALL the way up like I thought it should be Thanx for all the advice.

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1991 Z28 6.0 TPI

360 4 bolt main block, TrickFlow 23 degree heads, CompCams CS270HR cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, 2500 stall, bullet proof 700R4, aluminum driveshaft...