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Old 10-19-2004, 05:01   #1 (permalink)
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combo settled on

New combo for my wagon settled on,
351 cleveland stock bore 6"rod, flat top pistons moly rings, fully prepped 4ma crank, chamfered oil gallerys, stock oil pump, f248 solid cam & lifters, double row chain 2v heads with larger stainless ferrea valves isky springs, funnelweb manifold 780 vac sec holley came of a cobra jet big block, c10 shift kitted running a 3700 stall, b&m pro ratchet and 31 spline 3.7 geared 9 inch.
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Old 10-19-2004, 09:50   #2 (permalink)
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Re: combo settled on

Quote:
Originally Posted by azza
New combo for my wagon settled on,
351 cleveland stock bore 6"rod, flat top pistons moly rings, fully prepped 4ma crank, chamfered oil gallerys, stock oil pump, f248 solid cam & lifters, double row chain 2v heads with larger stainless ferrea valves isky springs, funnelweb manifold 780 vac sec holley came of a cobra jet big block, c10 shift kitted running a 3700 stall, b&m pro ratchet and 31 spline 3.7 geared 9 inch.
AZZA
For that camshaft, I'd sell/trade the 780 VS for an 750-800 CFM DP. You can probably sell the 780 to a US restorer and buy a brand new DP for the returns. I personally don't like VS carbs on a single plenum inlet with a fairly big (duration) solid lifter camshaft. It makes tuning the secondaries more trouble than it is worth, IMO. A DP will be easier to tune and make work right for your combination, I believe.

I would look at going +.010" on your bore as this will help unshroud your larger valves better. I would recommend forged pistons. I take it that you're talking about a 302C rod?

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Old 10-19-2004, 14:28   #3 (permalink)
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Re: combo settled on

How are you achieving the stock bore?
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Old 10-19-2004, 18:08   #4 (permalink)
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Re: combo settled on

with so many variables with engines my engine builder has been building clevelands for 30 years and achieved a 11.5 sec quarter through a bullnose toploader and aspirated and a 3.7 diff only difference to his engine was a bg 850 speed demon, secondly a well known mackay drag racer is using a stock bore 351 and 6 inch combo his times went from 11,s to 10,s with only a rod change (going to 6 inch) i was skeptical at first but i have seen this guy rev his own engine to 8500 rpm and the engine has been together for 8 years and has been re ringe once! sometimes people make the mistake of buying say 8 thousand dollars worth of parts and spending 200 bucks to assembe the engine when you can with the right knowledge and expertise some one old school can perform awesome engine building without having a speed catalogue worth of parts inside. just my thoughts, when i dyno the engine i will post the figures and when i run it at the drags at willowbank i will post the time slips not making any claims to times but i am expecting low 12 street trim
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Old 10-19-2004, 19:42   #5 (permalink)
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Re: combo settled on

Your low 12's are possible. I ran similar but 750dp/3500rpm stall and 4.11 gears. With a completely trashed auto I ran 12.95@105.96. That was using cast iron 2V heads (494hp flowed). Even with the auto slipping it still managed 227rwkw (close enough to 230). I'm not sure how you'll go with street tyres but you'll have fun anyway

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Old 10-20-2004, 00:52   #6 (permalink)
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Re: combo settled on

Good luck, i would go with the carb Davis suggested and change the diff gears to 4:11 as well.
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Old 10-20-2004, 01:11   #7 (permalink)
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Re: combo settled on

I had 3.5 gears for some years, but did go to 3.9. I think the 3.9 with my 14 inch wheels is nearly too low for street driving. I think if i had it over again, i would go 3.7:1, as these still pretty short with small wheels.
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Old 10-21-2004, 03:58   #8 (permalink)
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Re: combo settled on

Quote:
Originally Posted by azza
New combo for my wagon settled on,
351 cleveland stock bore 6"rod, flat top pistons moly rings, fully prepped 4ma crank, chamfered oil gallerys, stock oil pump, f248 solid cam & lifters, double row chain 2v heads with larger stainless ferrea valves isky springs, funnelweb manifold 780 vac sec holley came of a cobra jet big block, c10 shift kitted running a 3700 stall, b&m pro ratchet and 31 spline 3.7 geared 9 inch.
AZZA
No doubt people would have been on your case about oil restrictor kits. I've heard a lot of theory's about this. Some blame the sump mainly due to oil drain back under hard acceleration. Chevs don't get this , the pums at the back. One other alternative I've heard, which comes from jack Rousch is to reshape the oil pump gallery to reduce output pressure. Apparently George Wegener does this. How much it costs I'm not sure. Don't know if this helps at all. I do know a few people who have not worried about this oiling issue and both of them wrecked there bottom ends. From what I've managed to learn about clevos that combo should haul. Maybe low 12's with slicks??
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Old 10-21-2004, 04:13   #9 (permalink)
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Re: combo settled on

hi duke my engine assembler believes in using the stock oil pump which he modifies (his secret) he believes the hi volume pumps send to much oil up top and has a interesting theroy on rocker covers as well. from what his ute has run at willowbank which is mid 11 using same combo as mine but larger carb and he has a bullnose toploader and running 3.7 gears as my aim is to drive to the track which is around 1 hour from toowoomba i am sticking with 3.7 gears and a 3700 stall, guess only time will tell, i hope to run the week after the nationals in november which will be 13 november or i will take her down for a wednesday night meet.
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Old 10-21-2004, 16:36   #10 (permalink)
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Re: combo settled on

Quote:
Originally Posted by azza
New combo for my wagon settled on,
351 cleveland stock bore 6"rod, flat top pistons moly rings, fully prepped 4ma crank, chamfered oil gallerys, stock oil pump, f248 solid cam & lifters, double row chain 2v heads with larger stainless ferrea valves isky springs, funnelweb manifold 780 vac sec holley came of a cobra jet big block, c10 shift kitted running a 3700 stall, b&m pro ratchet and 31 spline 3.7 geared 9 inch.
AZZA
azza,

couple of suggestions maybe worth considering above.

I'm guessing you've found a very good standard block to be able to hone and reuse at standard without any gap/clearance issues?

The 302C rod I've found to have good results.

When you say stock oil pump, its not really stock if is remaking the insides. He obviously has had some experience there.

Have the heads had any work done? ie. porting, etc?

780 VS sounds like the only little bit of a downfall so far. As suggested above, I'd think a 750DP or even 800DP maybe would suit better, but thats only my opinion.

Whats size/type tyres you going to run? I personally like the 3.7 ratio but all depending on tyre size. Good all-rounder ratio.

Also, wouldn't a bit larger convertor work to your advantage more here? Just if you have drags in mind, I'd think a 4000+ convertor would suit more?

Anyways, sounds like a nice mildish engine that could produce some good numbers at the track. Good Luck!
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