Gaspo's 99 trans am project

[DETROITMUSCLE]

What is a "big cam"?

[SS4Matt]

What is a "big cam"?

"3/4 Race Cam"
http://www.jegs.com/i/Crane+Cams/271/10018/10002/-1

[1BADAIR]

What is a "big cam"?

[nascarnate326]

Did you get the fire hawk wheels for the rear?

Looks like a fun car

[Gaspo]

Thunder TRak...230s over 650 lift 112lsa is what I was told? I'm new to the cam game. I have a full set of the firehawk wheels. They need refinishing. The car only came with the rear wheels so I took two with me to trailer the car back

[Gaspo]

Just picked up intake from mcalus. Thanks for the quick easy transaction! Always easy guy to get along with. I need the intake bolts now. Anyone? What are causes for a rocker arm to break?

[SS4Matt]

Just picked up intake from mcalus. Thanks for the quick easy transaction! Always easy guy to get along with. I need the intake bolts now. Anyone? What are causes for a rocker arm to break?

A Big Cam and Coil bind

[Gaspo]

A Big Cam and Coil bind

Coil bind? What's that? How do I prevent this from happening again?

[SS4Matt]

Coil bind? What's that? How do I prevent this from happening again?

is it an intake rocker i'm assuming?

[Gaspo]

is it an intake rocker i'm assuming?

I can't remember I'll check when I get home in an hour or two

[SS4Matt]

I'm assuming it's an intake rocker just because of the amount of lift/duration and really high ramp rate lobes that are on that "TRak" cam. when you have a cam like that, it's rather violent on the valve train. Coil bind is when the valve spring compresses as far as it can go and "Binds" usually it either brakes the spring, or whatever is the weakest part of your valve train. (bent pushrod, broken rocker, broken valve spring, collapsed lifter....)

What valve springs are on the car? I would hope a set of patriot extreme golds (or something similar) for that cam and some hardened pushrods at the very least

[Lucky SOB]

.650 lift? Not with anything near stock pistons....

[SS4Matt]

.650 lift? Not with anything near stock pistons....

Thunder Racing Custom Camshaft
"TRak" - 231/234 .640/.590 112 LSA 2400-6800 RPM Power Band. Excellent mid-range & high RPM power. 3200 stall, 3.42 gear, computer tuning required. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended. Comp 921 Valve Springs are highly recommended

[Gaspo]

I'll check what springs are on it. I thought it has stock pistons...

[Lucky SOB]

Thunder Racing Custom Camshaft
"TRak" - 231/234 .640/.590 112 LSA 2400-6800 RPM Power Band. Excellent mid-range & high RPM power. 3200 stall, 3.42 gear, computer tuning required. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended. Comp 921 Valve Springs are highly recommended

I've never seen anyone run over a .620 lift without fly-cutting the pistons for PTV clearance. School me if I'm missing something tho!

EDIT: Just did some reading and max lift occurs when the piston is half way between TDC and BDC.