Cam timing big block 540 - Chevelle Tech
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post #1 of 12 (permalink) Old Aug 21st, 19, 5:08 AM Thread Starter
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Håkan
 
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Cam timing big block 540

I have a long time project. A 540 big block that i will be installing the cam and timing set on soon. So the cam card calls for a 108 icl, no advance. do you guys think that sounds right or should i install it advanced? I have a stock 572 timing set so I would have to use a ofset key.
Engine specs are. 4.5x4.25 540, brodix bb2 xtra heads, super victor intake, 10.75:1 comp, cam is 260/268 108 lsa, 714/714.
How much would I gain or loose with say four degree advance?
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post #2 of 12 (permalink) Old Aug 21st, 19, 7:30 AM
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Re: Cam timing big block 540

I wouldnt. 108 icl should work good there. There will be plenty of bottom end, more advance would just lower rpm range and build lower rpm power thats just not needed

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post #3 of 12 (permalink) Old Aug 21st, 19, 2:37 PM
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Re: Cam timing big block 540

Dial the cam in, and make sure it ends up at 108, you'll be good.

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post #4 of 12 (permalink) Old Aug 21st, 19, 5:22 PM
 
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Re: Cam timing big block 540

I'd put it in at 103 ICL. Would run it there. Then I would loosen intake lash .004" and tighten exahaust lash .004". Big improvement after that adjustment.

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post #5 of 12 (permalink) Old Aug 21st, 19, 9:46 PM
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Re: Cam timing big block 540

Quote:
Originally Posted by cstraub View Post
I'd put it in at 103 ICL. Would run it there. Then I would loosen intake lash .004" and tighten exahaust lash .004". Big improvement after that adjustment.
In an effort to learn, why?

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post #6 of 12 (permalink) Old Aug 21st, 19, 10:03 PM
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Re: Cam timing big block 540

If you don't take Chris's advise on advancing the cam you need to definitely do the lash change. Do a before/after test and you won't be sorry!

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post #7 of 12 (permalink) Old Aug 22nd, 19, 2:21 AM
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Re: Cam timing big block 540

Is that a test lash, or he can run it there with out seeing how it it does at 108, and the called for lash? He's in Sweden, a new cam may be pricey, and take awhile to show up. Not doubting, just checking.

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post #8 of 12 (permalink) Old Aug 22nd, 19, 6:25 PM Thread Starter
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Håkan
 
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Re: Cam timing big block 540

Yes I guess the intake/ exhaust split is a little bit small for the heads, So i will try the lash change.
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post #9 of 12 (permalink) Old Aug 23rd, 19, 12:20 AM
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Re: Cam timing big block 540

you'll need to check carefully on the valve to piston clearance after changing the cam timing.

have you already checked?

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post #10 of 12 (permalink) Old Aug 23rd, 19, 6:29 AM
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Re: Cam timing big block 540

Quote:
Originally Posted by berserker View Post
I have a long time project. A 540 big block that i will be installing the cam and timing set on soon. So the cam card calls for a 108 icl, no advance. do you guys think that sounds right or should i install it advanced? I have a stock 572 timing set so I would have to use a ofset key.
Engine specs are. 4.5x4.25 540, brodix bb2 xtra heads, super victor intake, 10.75:1 comp, cam is 260/268 108 lsa, 714/714.
How much would I gain or loose with say four degree advance?
If Chris recommends a different split why not just get a different cam ground and be done with it. For that matter you can have the one you already have reground, take a little off the intake side to shorten intake duration and add a few degrees on the exhaust side. Then you're not messing with playing with lash and staying right within the ramps where the lifters should run for durability.

PS I understand you're in Sweden so it's not as simple as just shipping something out via UPS, but if it's a long time project why risk having P/V clearance problems just to beat a couple extra weeks wait.

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post #11 of 12 (permalink) Old Aug 24th, 19, 4:36 AM Thread Starter
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Håkan
 
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Re: Cam timing big block 540

Right now I will not change or regrind the the cam becuse cams are expensivie especialy here in sweden, and I don't belivie it will be all that bad. What kind of hp and torque numbers do you think it will make?
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post #12 of 12 (permalink) Old Aug 24th, 19, 10:33 PM
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Re: Cam timing big block 540

Quote:
Originally Posted by berserker View Post
I have a long time project. A 540 big block that i will be installing the cam and timing set on soon. So the cam card calls for a 108 icl, no advance. do you guys think that sounds right or should i install it advanced? I have a stock 572 timing set so I would have to use a ofset key.
Engine specs are. 4.5x4.25 540, brodix bb2 xtra heads, super victor intake, 10.75:1 comp, cam is 260/268 108 lsa, 714/714.
How much would I gain or loose with say four degree advance?



The very first iteration of my 540 was very similar. 10.5 compression, out of the box Brodix 2Xtra's...but I had an older Team G intake (short one) with a 1050 Dominator...no spacer. My cam was a 262/273 on a 112 LSA. .731 lift. It made [email protected] 6400 or so. The Super Victor should help 20+ HP at least.

Those heads respond very well to some port work. The same basic engine made 870'[email protected] after becoming a 555" with another point of compression, ported heads, SV and a 268/272" cam. Still dyno'ing and racing on 93 octane pump gas.

All of this was with a belt driven water pump and no vacuum pump.


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