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Old 04-29-2003, 05:47   #1 (permalink)
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biggrin 351 build-up

At present I am in the process of building a 351 for my xb.

Engine specs to be done will include:

: : 302 conrods with ACL flat top pistons
: : Oil restrictor kit
: : 2V with 4V valves closed chamber heads [quench]
: : Edelbrock performer manifold
: : 650 Holley carby

I will be building the motor to run on premium unleaded and wondering what compressions people are using with premium fuels.

I will also be running a C4 box with a stally of around 3500rpm so would like some help on choosing a good cam.

Would like to hear of other peoples setups and power outputs, any help will be greatly appreciated.

Thanks
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Old 04-29-2003, 06:31   #2 (permalink)
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i was always told that you choose a converter to match your cam, for example if your cam works from 2500-5500 you would want a stall around the 2500 mark. On that theory you would need a pretty big cam like the crane h-238 but you are running a performer manifold which will kind of die at 5500rpm, and you will need well over 10.5 to 1, good luck!

I am running about 9.6:1 compression, speed pro stage 3 cam (2500-5500 i believe) redline street dominator 650 vac sec, 2v cc with 4v valves. Its not a wild setup but very driveable and fun!
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Old 04-29-2003, 07:11   #3 (permalink)
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Ahhh the Clevo, my favorate.....

Since you are using the 302 rods, (which BTW, is a very good move), it will rev very nicely.
My preference is to use a single plane manifold like a weiand or Holley street dominator, as the Performer dies at high revs.
The single plane gives little away to the Performer at low revs.
Block off the heat passage which travels through the manifold too.

I wouldn't go much bigger than a Camtech stage 3 with an auto and ask Camtech what stall converter they recomend, (3500rpm sounds rather high to me and will likely be a pig on the road).
I also prefer solid lifters to hydraulic.

10:1 CR should be fine and dandy, but you must use PULP or Optimax, etc.
With PULP fuels in mind you will need good exhaust valves and hardened exhaust seats.
Have bronze guides fitted too.

650 Holley is a good choice, but use a double pumper if you want decent top end power.

Fit a decent sump as they suffer badly from oil surge with the standard unit. I'd also fit a stronger oil pump drive and a decent roller chain.

Keep us posted.

Rick.
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Old 04-30-2003, 01:16   #4 (permalink)
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Thanks for the advice guys, really appreciate it I am pretty sure that the carby is a double pumper.

Also has anyone got an idea of power outputs on a setup similar to this.

Thanks
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Old 04-30-2003, 01:17   #5 (permalink)
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without knowing your cam there is no way we can even guess your output
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Old 04-30-2003, 01:30   #6 (permalink)
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Quote:
Originally posted by TKB Racing
Thanks for the advice guys, really appreciate it I am pretty sure that the carby is a double pumper.
Also has anyone got an idea of power outputs on a setup similar to this.
Thanks
With a stage 3 Camtech (or similar) anticipate somewhere between 220kw and 260kw, depending on CR, manifold and amount of headwork.

Rick.
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Old 04-30-2003, 02:16   #7 (permalink)
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With 3500 histall you require a min rear end ratio of 4.11 and a Crane F238 solid cam and lifters would suit the combo to a tea.

F238 rev's to around 6500 with headwork this can decrease or increase. F238 runs from 3000-6500.

Recommend compression ratio for the F238 and F246 is 10.5:1 or higher. Meaning you can't run on anything but 98ron fuels unless your in a situation where 98ron isn't available.

Next steup up requires 4.56/4.86 rearend ratio running an Crane F246 cam and histall around 4200-4500.

If you don't want to play with auto's? A manual may be in order?

In regards to the 650hp. With either of the above setups the mechanical fuel pump won't supply enough fuel and the 650dp may not either. The above setups require a 750dp which is ample for the F238 setup but only just enough for the F246 setup.

Brenden
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