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Old 03-13-2006, 10:24 AM
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small base circle cam?

I was talking to a rep. at comp. cams,and he said with my 400 small block eng. and I am running a 6" rod I would have to run a small base circle cam.I just bought a roller crane with 508 intake,and 528" lift exhaust.I want to make 500 horses at a decent rpm.Some street use but I need the motor to make as much power to compete.I have another post in title how much power should this make.I listed it last night it has all the engine specs. anyone who has built a 400 with cam rec. please post,and let me know how yours did.
I was also told when I built my 383 I would have to run one,but I had know clearance problems. Thanks

Other post with engine specs(how much power will this make)

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Old 03-13-2006, 11:25 AM
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What style of connecting rods are you running? Usually that's the difference. i have built quite a few 383's and the stock style rods/rod bolts can cause an issue. The H-beam and profiled rods with cap screws usually clear a standard base circle.

Royce
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Old 03-13-2006, 11:25 AM
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cam

In the engines i build, i will fix ( clearance) the rods to fit a standard cam.... I perfer not to run any small base circle cams....


Keith
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Old 03-13-2006, 12:16 PM
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Quote:
Originally Posted by k-star
In the engines i build, i will fix ( clearance) the rods to fit a standard cam.... I perfer not to run any small base circle cams....


Keith
Why wouldn't you prefer a small base circle cam
crane makes a roller 296/304 degree which is a small base circle,and it has alot more lift 539/558" 2500-6500
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Old 03-13-2006, 12:33 PM
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cam

Because the small base circle cam will flex.... Not bad with the lighter spring pressure but on the bigger springs it is a problem... My cam grinder will not even grind me a small base circle cam...

Keith
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Old 03-13-2006, 01:11 PM
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Quote:
Originally Posted by k-star
Because the small base circle cam will flex.... Not bad with the lighter spring pressure but on the bigger springs it is a problem... My cam grinder will not even grind me a small base circle cam...

Keith
the springs i am running are 1.440" would these have to much pressure?
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Old 03-13-2006, 02:00 PM
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Quote:
Originally Posted by dboyett38666
the springs i am running are 1.440" would these have to much pressure?
I dunno about pressure but if they are to light for the lift of the cam and rpm your turning you will get valve float at higher rpms and possibly swallow a valve.
Match your springs to the cam you use.
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Old 03-13-2006, 04:14 PM
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Thanks I'll check right now
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Old 03-13-2006, 09:36 PM
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I run a 408 with 6" i-beam rods and got a small base circle camshaft XR282 done by Comp. I know my engine builder still had to do a little clearancing to ge the lobes to clear. I went with the 1.43 986 springs (132 lbs/open and 280 lbs/closed) and 7.3" pushrods that Comp recommended at first when I had S/R Torquers but when upgraded the heads to Sportsmans, I went with 1.6 rockers, the Crane 1.46 99893 springs (130 lbs/open and 402 lbs/closed) and 7.5" pushrods. With rollers, you need to run dual springs for the spring preesure needed to handle to ramp rates. Make sure the camshaft you get also has the cast-iron gear to eleiminate running a bronze gear on your distributor and you will also need a bronze-tipped fuel pump pushrod if running a mechanical fuel pump.
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