4 Pattern cam
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,792
Likes: 429
From: Aarhus, Denmark
I had a 7200 rpm very streetable 355 ci for many years with an auto tranny. You have to remember that the original C-5 Z-06 had 405 hp and a 7000 red line.
I've since changed to bigger motors with altered firing orders and a 5 speed. Manual transmissions are very forgiving of more radical cams.
I looked long and hard at the 4 pattern cam, but when it came to having my solid roller with lobes out of the lobe profile pages and the request for an altered firing order the comp cam guys choked and then they even shipped me a custom billet cam without the agreed upon sleeved on dizzy gear. So I almost got a 4 pattern.
I would tend to go with something more than a 1800-5800 rpm grind with a 4 speed and I would ask about a 4-7 firing order swap. All you have to do is change the plug wire firing order on the cap
I've since changed to bigger motors with altered firing orders and a 5 speed. Manual transmissions are very forgiving of more radical cams.
I looked long and hard at the 4 pattern cam, but when it came to having my solid roller with lobes out of the lobe profile pages and the request for an altered firing order the comp cam guys choked and then they even shipped me a custom billet cam without the agreed upon sleeved on dizzy gear. So I almost got a 4 pattern.
I would tend to go with something more than a 1800-5800 rpm grind with a 4 speed and I would ask about a 4-7 firing order swap. All you have to do is change the plug wire firing order on the cap
And that is good, that is what I have in my SBC 427 :- )
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
If you were going to flow the top end as a unit, wouldn't you want grind a camshaft so that all cylinders received the same amount of fuel, in essence having an 8 pattern cam not counting the exhaust, i know it would be a lot of work and a pain, but if you were trying to squeeze the orange dry, having all cylinders perform at the same level would help and it would make sense toward reving higher given each cylinder produces the same exact amount of power and you wouldn't have part of the cylinders doing the spinning and the other half trying to catch up.I'm probably over thinking it.
Now for a guy that is running a class and it has engine limitations then yes it is money well spent. Most street guys won't spend $3000 for 8 to 12HP.....others will and have too.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
It has been my understanding different ports that are different in length give a broader powerband rather than making them all equal for example different length injector stacks way back;could change the powerband making it narrower or broader perhaps wording is wrong here.
Street vs track only 2 different goals.
Street vs track only 2 different goals.
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,792
Likes: 429
From: Aarhus, Denmark
For a street guy the above for the labor involved your looking at around $1000 to get the data then the cost of the camshaft which is around $1200 to $1500 for multi lobes on 1 stick.
Now for a guy that is running a class and it has engine limitations then yes it is money well spent. Most street guys won't spend $3000 for 8 to 12HP.....others will and have too.
Now for a guy that is running a class and it has engine limitations then yes it is money well spent. Most street guys won't spend $3000 for 8 to 12HP.....others will and have too.
And as I understand it, it works, especially in race cars, and it is very expensive.
It has been my understanding different ports that are different in length give a broader powerband rather than making them all equal for example different length injector stacks way back;could change the powerband making it narrower or broader perhaps wording is wrong here.
Street vs track only 2 different goals.
Street vs track only 2 different goals.
X 2 
Thx all
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
