phildownunder

I am building a 4V engine with 302 rods, the comp will be 11.2:1 with a Funnelweb 4v manifold, Pacemaker 4 into 1 headers 17/8" dia. It is going into an XW for Historic racing. Has any one got any ideas about a good cam? I will be limiting the revs to 7000RPM.

crochunter

crane 246

4Vman

If you're going into group Nc id consult a decent engine builder and get a special grind made to suit.
Off the shelf stuff is fine for recreational use but if you're going serious racing id get a custom grind made, the quality and consistancy will be better and more durable for constant high RPM use.

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LTD351V2

wade cams 180$ for a custom solid flat tappet cam, you can't beat that.

turbomania

yes a custom grind to suit your motor would be ideal but if you want something quick and easy off the shelf i would go with croc and say the 246 crane or maybe the 256 crane both can make good power, i can get a cheap price for cams if you want .

LTD351V2

whats the best prices around for a F246? Whats not easy about filling out a sheet and sending to them?????? talking a race car here and a custom cam for sub-200$ who wouldn't, you'd be silly not too.

turbomania

jeez people read too much into things on this forum , nothing hard about filling a sheet in .i simply meant if he wants it now he could just go and buy it off the shelf right now [crane 246 or 256 ] where as from my experience a custom cam can take up to a week or more , my last custom crow cam took a little over a week . and by the way did you know them cam sheets you all fill out hoping to get a custom cam most of the time they give you a cam that is allready in there catalouges and are on there shelfs and is not really a true custom cam anyway . and yes i know it is a race car he said as much .

phildownunder

Hi, I am currently running a 2V engine with 351 length rods and a Crane 246 grind, which I am very happy with.What I should have asked is, what if any difference in cam grind will I need to make, changing from a shorter to a longer rod, which changes the breathing characteristics of the engine a little.I am trying to extract every bit of horsepower I can.
Regards Phildownunder.

phildownunder

Has anyone had any experience with testing the two different rod lengths and the effect it has on breathing and what if any camshaft changes did you make to optimise the setup for maximum power, going from a 351 to a 302 length rod.It is to be used for circuit racing, with a rev limit of 7000RPM.I am looking for around 650HP@ 65000RPM
Engine specs.
comp 11.2:1
Heads 4v
Extractors Pacemaker 17/8" 4 into one
Manifold Funnelweb 4V
Rods 302c
Carb. 825 D.P.

russxr67

Phil,what makes you believe that using the 302 rod will give you more power.?
From what i have been told a 351 is actually better off using the standard length rod. I think a lot of the longer rod = more power theory is probably biased to suit the small block chev stuff when Smokey Yunick was around. However the clevo is different in the cyl head dept and i believe it is here in relation to exhaust flow that the longer rod theory has no value with stock strokes. In fact with the 4v heads you may be even worse off due to severe imbalance between the intake and the exhaust. The longer rods tend to be better on engines with poor intake ports,something the clevo does not suffer from.I,m no expert on the subject but someone who knows clevo,s like pro engines(formerly TOCA) might be of further assistance.