chevy 406

[ventura74]

Anyone else have any cam recommendations or anything in general

[RevTheory]

Anyone else have any cam recommendations or anything in general

Would you prefer to favor a n/a cam that's capable of taking the occasional nitrous shot or would you rather cam it in favor of nitrous?

[FuelieNova]

Seems like you haven't given the cam guys much to go on yet. IMO you need to wait until you have your heads back with numbers, know your final compression ratio, what rpm range you want to run in yada yada.
Otherwise there guessing
Tom

[427dart]

270+ .050 duration on a 406 for street? That is a bunch! I run high 10's at 132 with a weany 241/249 hyd. roller with a 3.50 gear in my 427W powered Mustang LX. It's no high powered race car but very street friendly especially below 3500 RPM which is where you are on a real street nowdays.
Guess "Street" has a very liberal meaning...anything goes!
Of course I'm 62 yrs. young and what I have is enough for me.

[ventura74]

Anyone else have any cam recommendations or anything in general

Would you prefer to favor a n/a cam that's capable of taking the occasional nitrous shot or would you rather cam it in favor of nitrous?

N/A cam for sure thanks.

[RevTheory]

Seems like you haven't given the cam guys much to go on yet. IMO you need to wait until you have your heads back with numbers, know your final compression ratio, what rpm range you want to run in yada yada.
Otherwise there guessing
Tom

Fo sho!

Head flow- full curve from low to high
Compression
Rocker ratio
Max rpm
Favor street vs nitrous
Behavior bias- as in "I'd really like 500 hp but I still have to fire it up at 4 AM and drive to work", as an example

Then you can get into the whole litany of car stuff: weight, launch rpm, current traction, bumpers painted vs chrome, visits to the concession stand in between heats, spring vs fall air in your tires, etc... lol

[ventura74]

Seems like you haven't given the cam guys much to go on yet. IMO you need to wait until you have your heads back with numbers, know your final compression ratio, what rpm range you want to run in yada yada.
Otherwise there guessing
Tom

Fo sho!

Head flow- full curve from low to high
Compression
Rocker ratio
Max rpm
Favor street vs nitrous
Behavior bias- as in "I'd really like 500 hp but I still have to fire it up at 4 AM and drive to work", as an example

Then you can get into the whole litany of car stuff: weight, launch rpm, current traction, bumpers painted vs chrome, visits to the concession stand in between heats, spring vs fall air in your tires, etc... lol

head flow I don't have actual #s yet they are RHS 235 compression comes out to 12.1, rocker will be 1.5 (current cam is .258in .268ex at .050 .640 lift) max rpm well probably around 7200 or so. Im not worried about how radical it is on the street I only drive it for fun and not more than 2000 miles a year. I would like to get up around 650HP that being said I don't mind giving up power for lobes easy on the valve train. Im only building this for me not a class or anything else just something Ive always wanted

[RevTheory]

I'm thinking along the lines of ~260/272 @ .050 on a 108 LSA. Sound about right?

Edit: You didn't mention your current LSA so I don't know if what I calculated changes much and I'm better off leaving the reliability of various lobes to the cam designers. I'm not sure if I helped you out at all, lol.

[ventura74]

Well I'm looking at a Lunati 271in 279ex at .050 .640 lift with 1.5's on a 106 how does this sound like I said just trying to get a ballpark figure any suggestions would be great

[farmengines]

You don't want that split, not going to like it. I have built many engines practically a clone of what you are putting together. I'm very familiar with the heads as well. My recommendation of 275in 279ex with a 106 lobe seperation is not a guess, that's definitely in the ballpark of what it's going to want. Hopefully you find a lobe with 195 or better duration @.200 for the intake. I don't think it would be a problem as long as you use good parts and stay on top of the spring pressure and valve lash. In case you don't already have a preferance I'd call PTC for the converter, just let them know what you have and they'll get you what you need.

[Eliminator540]

What is the deck height of your block and what length connecting rods?
If it's a 9.025" deck, and your using a 6.00" rod and 3.75" crank, isn't a 1.125" piston going to leave it 0.025" below the deck?

[RevTheory]

You don't want that split, not going to like it. ...

You sure could be right. I can't find any flow numbers below .400 and the exhaust/intake flow differential was over 70% at that point.

[ventura74]

What is the deck height of your block and what length connecting rods?
If it's a 9.025" deck, and your using a 6.00" rod and 3.75" crank, isn't a 1.125" piston going to leave it 0.025" below the deck?

I don't have the block back yet but probably around .020 .018 like others have said I'll probably use a .027 head gasket why do you ask?

[ventura74]

You don't want that split, not going to like it. I have built many engines practically a clone of what you are putting together. I'm very familiar with the heads as well. My recommendation of 275in 279ex with a 106 lobe seperation is not a guess, that's definitely in the ballpark of what it's going to want. Hopefully you find a lobe with 195 or better duration @.200 for the intake. I don't think it would be a problem as long as you use good parts and stay on top of the spring pressure and valve lash. In case you don't already have a preferance I'd call PTC for the converter, just let them know what you have and they'll get you what you need.

Why do you say that? Not questioning your knowledge just trying to learn myself

[Eliminator540]

What is the deck height of your block and what length connecting rods?
If it's a 9.025" deck, and your using a 6.00" rod and 3.75" crank, isn't a 1.125" piston going to leave it 0.025" below the deck?

I don't have the block back yet but probably around .020 .018 like others have said I'll probably use a .027 head gasket why do you ask?

I thought you meant they might or might not deck the block, which would have been 0.052" with a 0.027" gasket, if they didn't.