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A couple of weeks ago I posted a question re my small block bogging down at high rpm. As usual some very good suggestions were given. I changed the float levels but it didn't seem to help much. That kind of ruled out my feeling that perhaps the fuel pump wasn't keeping up. I ordered a set of heavy duty points from NAPA and that really did the trick. I was surprised as the car ran so well under normal driving conditions I didn't think the points would be the problem. Apparently I was getting some float with the old set and there also was a small burn spot on the points that couldn't be seen until I pulled them. Lightly lubed the advance weights as well. The car runs much better now and I thank everyone for their suggestions.
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Re: Update - '64 365 hp Bogging Down
What was the part number of your points from NAPA?
I need to log this for my personal archive
Gary -
Re: Update - '64 365 hp Bogging Down
The NAPA part number for the points (hi-Perf) is CS7860. The condensor is RR175. Interestingly, the counter guy said he could tell from his computer they had never sold this particular set of points at any of their northwest Ohio stores since their computer system existed, which I assume was 20 years plus. They had only sold standard sets. Worth the extra few bucks just for pice of mind. The list price was $13.99.
DavidComment
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Re: Update - '64 365 hp Bogging Down
The distinguishing feature of these points is that they have higher breaker arm tension - 28-32 oz. versus 19-23 oz. for the standard sets, so I refer to them at "high breaker arm tension points". "Heavy duty" does not connote a useful differentiation from the standard 19-23 oz. set. I have CS786 as the NAPA part number, not CS7860 - the NAPA part number has always been confusing to me.
You can also buy these points under the Borg-Warner brand, A112HP, or Standard Ignition Bluestreak, DR-2371XP. The Delco D112P are long out of production.
This high breaker arm tension point set showed up about '65-'66 in some GM Muscle car engines, but were never OE on Corvettes or called out as retrofit for Corvettes even though mechanical lifter Corvette engines rev higher than any big block engine from other divisions.
I recommend them for all Corvette point ignition engines with redlines over 5500, which includes all mechanical lifter SBs.
On SHP engines it is also critical that the distributor be "blueprinted" - tight shaft bushings, shimmed up end play to two to seven thou, and a snug, wobble free breaker plate. I have no doubt that many engines have their original breaker plate which is probablly wobbly due to wear from the vacuum advance rotating it relative to distributor housing a zillion times.
Distributors are probably the most overlooked component of the engine, but a properly functioning distributor is critical to engine performance and economy. Most of them could use a good overhaul, which is a fairly simple task.
Distributor disassembly/assembly is easy (see the appropriate service manual for your car) and assuming the shaft bushings are okay, the parts to make it better than new - breaker plate, shaft shims, points, condenser, rotor, cap, grease, and upper shaft seal probably don't amount to much more than 30 bucks.
DukeComment
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Re: Update - '64 365 hp Bogging Down *NM*
Bill Clupper #618Comment
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