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Old 06-19-2012, 02:29 PM
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Originally Posted by txdude350
I knew this would come in handy. I started a word document with all my specs. It's a work in progress so bear with me.

GM Block Casting Number
1969-1979 || 350 ci. || 185 low power || 370 high power || 2 or 4 Bolt Main || car, truck, Vette

Suffix Code on Block Behind Alternator
TKB ||1976 || 350 || || VIN: L LS9 || HP: 165 || 4 BBLS || Applications: C-10 & 1500
TKB ||1979 || 350 || conv. cab, m/t || VIN: L LS9 || HP: 165 || 4 BBLS || Applications: C-30 & 3500

Heads Casting Number
58cc chambers, 1.84/1.50 valves @ stock
Has had 1.97 intake valves put it in

650 CFM Holley

Edelbrock Torquer 2 Intake

4:56 rear end posi (Had stock gears in it before I did a rear end swap)

Cam Specs

I do not know anything about the torque converter.
That cam should give excellent low end torque in a 350 SBC, and given the 4.56 gears, it ought to shred the tires at will- so something is definately wrong here!

What is the initial timing set at? You can do a little research on timing, here is a page that may help you get up to speed (ha) w/the effects of timing on the overall performance of the engine.

Bottom line is I'm thinking you may not have enough initial timing. This may be because the dynamic compression ratio has you up against a detonation problem; a quick fix for that is to use less initial timing- but that can have a very bad effect on performance.

You need to see where you are now; if it's low I would suggest you try around 16 degrees BTDC, but this may require you to limit the mechanical advance so the total timing (initial plus mechanical) doesn't exceed 36 degrees or so.

I'd also suggest along w/a compression and/or leakdown test that you put a vacuum gauge on the engine and see what the vacuum is at idle. Check for vacuum leaks if there's any chance you may have one. The engine should idle pretty smooth w/that cam, so if it's loping/missing at idle, there's a problem that may be ignition (or possible carb) related.
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