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Old 08-15-2005, 06:12 AM
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Newbie Timming question

Hey guy,

I have a big question for you...Right now, I have the timming chain set at -4 degre, If I put the timming at +4, I want to know if it will be a big difference, I mean HP or torque or acceleration in quarter miles....

I have to say that my cam ask for a 10.5 CR and I have 9.45.....

There is my setup:
454 bored 0.60 (468 CI) Compression Ratio arount 9.45
Oval port Head (353049) Ported and polish Stage 3
Valve Job 3 angle 2.19-1.88 Manley Severy duty Valves
1.509 Dual Competition Valve Spring (matched to the cam)
Chrome moly Retainer and 10 degre lock (matched to valvetrain)
115 CC chamber (Original Head Shaved 65 thousand)
1.70 full Roller Crane Cam
305 H Hydrolic Radical Cam 575 lift Int/Ext. 305 duration Int/Ext 253 at .050
4.310 Speed Pro hypereuthetic Piston with 0.100 dome 1 valve relief
D.U.I mechanical Distributor
Spark Plug Wires, 409 Pro Race, 10.4 mm
6.135 - 5130 I beam Rod
Scat 4.00 Crank Nodular Iron
I beam 6.135 Rod
Everything Balanced and Blueprinted
39 Thousand Head Gasket with sleeve (fel-pro)
20 thousand Deck (around)
Weiand Team-G 7523 (2,500-7,900 RPM) Ported to Matched to the head (ported)
Mighy Demon 750 mechanical

Thanks in advance...


Chevy man forever!
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Old 08-15-2005, 08:12 AM
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adv will give you more torque down low and retarding it will give you more top end.i would put it where the cam manufactuer recommends putting it.if you have any problem because of your gears i would try changing it 2 degree's at a time til you get it where you want can get timing kits like the cloyes hex adjust that gives you i think about 12* of timing can also get the cloyes timing cover that has a removeable door in it to do the ajusting without taking anything apart.i have the hex adj. and they work pretty good.
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Old 08-15-2005, 08:14 AM
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I`d set it at zero. 4 degree advance + lowers the rpm band around 200 RPM, retarding raises the RPM band 200 rpm. so advance is for low end, retard is for high end.
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Old 08-15-2005, 10:23 AM
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Most CompCam's have +4 degrees already grounded into them. Straight up on the timing chain is most likely the best setup for a compcam.

It is normally a good think to advance a high performance cam if the cr is a little low.

Advancing the cam will increase cylinder pressure and will generate a little more low rpm torque at the expensive of a little high rpm power.

Advancing the cam could make the engine a little more prone to detonation.
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