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Old 07-30-2012, 11:07 PM
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Upgraded heads what cam choice?

Hi, just swapped my camelhump heads for some aluminium 210cc heads
Been told the 210cc is too big for a 350, running a 280 magnum cam at
480/480 lift at moment, any suggestions on a new cam choice while I have
The motor stripped down? I'm using flat tops and 64cc chambers. Valve springs Are good to 550 lift(flat tappet)
Using a 5 speed T5 manual and car weighs 2600lbs
Thanks in advance

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Old 07-31-2012, 12:39 AM
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what else do you have for your engine? IE: intake,carb? size of headers.intended use,etc.210s might be the answer for you?
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Old 07-31-2012, 12:57 AM
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Hi, using a rpm intake, block hugger headers(limited space),600 vac Holley(got a 650 double pumper on the shelf)
Mainly using it on the strip!

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Old 07-31-2012, 02:05 AM
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There's nothing wrong with the cam you have now, as it will work fine with the combo you have. I tend to agree 210cc heads are a bit big for a 350, but as light weight of the car and going with the 650 carb are both your friends in this case.
One of the most important things on making it a success is what rear gears are you running as it will need some fairly steep gears.
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Old 07-31-2012, 07:06 AM
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the velocity of the bigger heads will be a lot lower.Your off idle and low RPM throttle response will be noticably slower.The flow of the heads will make your top end charge stronger.
You should have a camshaft to take advantage of the improved flow potential.If you are racing then 750 double pumper will also wake up the top end power. T-5 wont last very long if you use slicks.I assume you already have a scatter shield?
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Old 07-31-2012, 07:49 AM
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I dont have a scattershield! Shall I go for a 650dp or 750dp? With the camelhumps I had lots of bottom end,so with these 210cc heads it will be the opposite then? My rear gearing is 3.09:1 at moment but that is with 13" wheels so that should be ok?
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Old 07-31-2012, 07:59 AM
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Quote:
Originally Posted by dave350v8 View Post
I dont have a scattershield! Shall I go for a 650dp or 750dp? With the camelhumps I had lots of bottom end,so with these heads it will be the opposite then? My rear gearing is 3.09:1 at moment but that is with 13" wheels so that should be ok?
Your gearing if fine if you never shift past third. You can put a lot of work into the 650 and get good numbers, or just take the easy route and get a bigger carb. You won't notice any bottom end loss over the camel humps, the heads may be a hair big but its better to be a hair big than a hair too small (or WAY to small in the case of your camel humps). If you're really racing this car then id forget the hydraulic cam, get a custom made solid flat tappet and you'll do much better, even with moderate lift and lobe design.

FWIW those .550" springs aren't good at all so when you get a cam get matching springs too.
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Old 07-31-2012, 08:50 AM
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What are you playing with? 3.08s with 13" wheels and a T5 is pretty uncommon here in the states. A note on that T5; generally a softer clutch or a little wheelspin will keep that T5 alive longer. One good Pro Stock launch and the driveline shock will begin to shorten the T5s lifespan if not end it entirely. Changing your fluid more often will help to keep it alive to some degree.
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Old 07-31-2012, 09:12 AM
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Im using a world class t5 from a cosworth over here in the UK,made an adapter plate so it would bolt to my 10.5" bellhousing. I put the 350 into a capri(dont think you have them over there!) The cars fairly light(2600lbs)
I just hate four pot engines! The capri originally had a 2.8 v6.
I am modifying a 8.8 ford axle(373:1 lsd) at moment to fit onto my leaf springs,not many manual gearboxes for chevys over here. so the t5 will stay till it grenades!
If Im using a 3.09 axle at moment with 24" diameter tyres what would that equate to with your cars with 373:1 and tall tyres? similar?
My first gear is about 30mph,2nd 60mph,3rd 85mph, does that sound right or is that way off?
Im looking for quick times on the strip,my camelhumps ran high 14s(crap I know) hoping to get close to 12s with new heads!

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Old 07-31-2012, 11:14 AM
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Quote:
Originally Posted by dave350v8 View Post
Im using a world class t5 from a cosworth over here in the UK,made an adapter plate so it would bolt to my 10.5" bellhousing. I put the 350 into a capri(dont think you have them over there!) The cars fairly light(2600lbs)
I just hate four pot engines! The capri originally had a 2.8 v6.
I am modifying a 8.8 ford axle(373:1 lsd) at moment to fit onto my leaf springs,not many manual gearboxes for chevys over here. so the t5 will stay till it grenades!
If Im using a 3.09 axle at moment with 24" diameter tyres what would that equate to with your cars with 373:1 and tall tyres? similar?
My first gear is about 30mph,2nd 60mph,3rd 85mph, does that sound right or is that way off?
Im looking for quick times on the strip,my camelhumps ran high 14s(crap I know) hoping to get close to 12s with new heads!
14's for that light of a car is pretty bad. Are you putting all your power to the track? Has the engine been dyno tuned or extensively track tuned? Heads will help you make more power but you may have other issues.
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Old 07-31-2012, 11:51 AM
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yes I had other problems,no traction in first 2 gears,hydraulic throwout bearing was causing clutch slip as well,need to iron out those issues!
Thanks for your imput!
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Old 07-31-2012, 02:00 PM
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Quote:
Originally Posted by dave350v8 View Post
I dont have a scattershield! Shall I go for a 650dp or 750dp? With the camelhumps I had lots of bottom end,so with these 210cc heads it will be the opposite then? My rear gearing is 3.09:1 at moment but that is with 13" wheels so that should be ok?
For a "mainly strip" car.. I'd get a good ratio in the rear end. 3.08's in a strip car will be a pooch.
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Old 07-31-2012, 03:08 PM
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Why I recommend sticking with the 650 is to help velocity. The larger port causes a loss of velocity that the engine has to make up for in RPM's.
So the dual plane intake and a 650 carb would serve you fine. However what you mentioned is true that the loss of low end will be made up for in top end power. If you drive this car on the street you'll like it to have just enough low end velocity so it's not a total slug on the street. However if you plan to just race it then by all means stick a 750 on it. Also when big port heads are used being it helps high rpm power at the loss of low end is why steeper gears are recommended. If it were mine and It was race only I'd slap some 4.56's under it.
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Old 07-31-2012, 05:21 PM
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Why I recommend sticking with the 650 is to help velocity...

Why the obsession with choking engines?
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Old 07-31-2012, 06:21 PM
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AP. One day I hope you'll learn to see things with logic rather than full blown performance. Did you not read what I said? I said if he planned to drive it on the street he may need some velocity just to make it have better street manners. And I also said if it was strip only then by all means use the 750 as on the strip alone low end is not of importance.
On a final note I sure hope one day your books can catch up with my experience.
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