cam-head-intake combo BBC
 

Will this camshaft compliment these heads,intake,carb for 509cid 9.5CR max 5500rpm: Canfield 310, Edelbrock Victor Jr Rect, Marine Demon 850 (any adjustments do you think for carb? )

Flows for Canfield
.100-72/74
.200-138/123
.300-204/176
.400-266/205
.500-318/237
.600-347/260
.700-353/273

Crane 139641
234/242 .610/.632 112

Any other recommendations, please give grind or part number. Thanks, Dave

I reacon its to big. Especially if you are using stock rod length. Also no go for wet pipes. Jas

i will be using wet exhaust.....too much overlap???

I have a similar parts in a 496. I contacted RMBUILDER on this site and had a custom cam ground for my application. Well worth the money, not the fasted turn around, but I can't wait to splash this in the water!

Yes that overlap looks to big. Remember those cams have been around for years. Technology has advanced:D

There are two thing missing from your combo.

AFR & RMBUILDER

The cam is way to much and was designed shortly after I was born.
Jeff

Well i already have all my parts for the shortblock and really dont want to sell anything but the camshaft and have one spec'd by RM Builder. The pistons are flattop with 4.5cc valve relief which means i need a cylinder head with 110cc chamber for the desired CR i want (9.4-9.6). Canfields offer their 310 head with a 110cc CNC chamber for the same price as their other versions. I can get a fully assembled pair with inconel and 110cc chamber for under $2000. I like AFR but if i went with them i would either have to (A) sell my new Lunati pistons which i got off ebay for $100 and buy new SRP with a dome for $550 or (B) get the AFR heads milled to 110cc which costs money too. Either way its about another $1000 for the new pistons and the difference in the price of the Canfields versus the AFRs. For now i'm on a budget and pick my pieces off of Ebay and other online sites as they come available and for cheap. Canfields have good flow numbers compared to most heads for their runner size (AFR better, yes). So it looks like the camshaft is old school and not up to par for the flow numbers posted for Canfield heads. So if anyone is interesed in a new Crane HR camshaft let me know. I'll use the money to get one custom ground for me by RM Builder. So the 509 will probably end up with Canfields, Victor Jr, 850 Demon, 9.5:1 CR and a custom cam by RMBuilder. i think it will pump out a decent 600+HP with good torque curve and idle. Any other ideas? thanks

It sounds like you are headed in the right direction. No mention about exhaust? What I ended up doing because I did not want to change pistons, I replaced my iron 118cc heads with 110cc heads which increased my ratio from 9:1 to 9:5 and larger 2.25 intake valves. That is when I called in RMBUILDER for the cam. This is it, no more changes after this.:D

If you can't swing the AFR heads right now, then you should at least have RMbuiler/Bob do the cam app for you.

The Canfield heads are a good choice. Their numbers are very close to the non cnc'd AFRs. The cam isn't bad but it has a little too much duration for a 5500 rpm redline and the exhaust duration is a bit long for such a good exhaust port. My cam in my AFR headed 540's is 236/240 and it's a little big for that application. Change the cam and you will have a killer engine.

I called Cometic today about a head gasket recommendation for my 509 build. they stated they could get thicknesses of .027, .030, .036, .040 He could not give me an actual recommendation for my particular build. Pro's/Con's etc of thin versus thick.

Dave,
Use the gasket that will give you a total stack as close to .040” piston to head as possible. Most OEM engines rate @ .020”- .025” in the hole from the factory. A .027” gasket will put you from .047”-.052”, acceptable but not ideal.

If you parallel deck the block to remove taper you also have the benefit of an improved gasket surface and more consistent cylinder volume. For example you deck to .015” with a .027” gasket your total stack is .042”, closer to ideal.

In the case where any combination of mechanical parameters renders your piston >.005” you will need to consider a gasket of .039” or greater.

These guidelines are for N/A engines.

Bob

I have a brand new Dart Big M. I guess without measuring the suface i wont know how much is going to be taken off at the machine shop, thus wont know what thickness gasket to buy until after that, correct? Is there any difference to using flattop pistons with a small chamber head (110cc) as opposed to using a dome piston and larger chamber head (119cc) if they both give the same compression ratio using the same manufacturer of cylinder head? One part of me wants to keep what i got (-4.5cc pistons) and go with 110cc head (which is harder to find but Canfield offers it without a surcharge) and the other half wants me to sell the pistons and buy dome top and go with AFR 119cc heads. Problem for me is price difference $$. Between the 110cc Canfields and my flattop pistons and the 119AFR and some dome pistons with both being around 9.5:1 CR is it really worth the extra money for what possible gains i would get. BTW, i'll probably use the Victor Jr Rect Port.

When I ordered mine, AFR had a 8 week backlog. Keep the Canfields, you'll never notice the difference.

The Canfield head on 502 to 540 CID engine works very well. That port actually CC's to about 300 cc so the heads have great velocity. The head was designed by Joe Petelle of HVH and does make good power.

I will have to agree with the others that have posted for a 502 that is going to see 5500 or so rpm that cam is a little big on duration but about right on lift, if the lift numbers were flipped.

[QUOTE=daveintexas;2055426]I have a brand new Dart Big M. I guess without measuring the suface i wont know how much is going to be taken off at the machine shop, thus wont know what thickness gasket to buy until after that, correct?

Tell them you want the piston down .010 -.012 in the hole and what parts you are using. Then get the .027 gaskets. Tightest quench possible is best for many reasons.

BT :cool: