stage 1 cam and 1.7 rockers, pushrod length?

D347643 · Jan 26, 2004

exactly like the title says im gonna be running a stage 1 cam with 1.7 rockers and i was wondering if anyone knows what length pushrod ill need.

thanks,

Drew

bock · Jan 26, 2004

If you use your stock heads,you may use your stock push rods.

D347643 · Jan 26, 2004

twisted wedge heads. I have trick flow pushrods that work on a stock cam and 1.6 rockers.

bock · Jan 26, 2004

D347643 said:
twisted wedge heads. I have trick flow pushrods that work on a stock cam and 1.6 rockers.

You will have to do a bit of geometry....

to see if the push rod you have now are good, put some black marker on the tip of a valve. put the push rod in the hole,mount your rocker. turn the crank 2 or 3 turns, Then, take of the rockers and look at the tip of the valve.

If the mark done by the rocker is in center, you are ok with this push rod. if the mark is more on a side.... your are to long or to short.... use an adjustable push rod to find your correct lenth,by doing this thest until your mark is in center.

D347643 · Jan 26, 2004

ok thanks, ALSO i want to run 1.7 rockers with the stage 1, will i need the spring upgrade for the twisted wedge heads to make them the "street" version? also, whats some formulas on finding the lift on a stage 1 .499/.510 with 1.7 rockers?

thanks,

Drew

p.s would it be smart to run a rocker girdle with that kind of lift?

90mustangGT · Jan 26, 2004

.499 / 1.6 x 1.7 = lift with 1.7's is .530
.510 / 1.6 x 1.7 = lift with 1.7's is .541

D347643 · Jan 26, 2004

they say the twisted wedge springs are good to .550 stock so is that even worth taking the chance?

mike keirstead · Jan 26, 2004

D347643 said:
they say the twisted wedge springs are good to .550 stock so is that even worth taking the chance?

If the heads are off the car now and you have the money for a set of springs....why not be safe. You dont want to ruin an expensive set of heads just because you were trying to save a buck or two. Springs are relatively cheap. If you are running the 1.7 and your lift comes up to .541 and the springs are good to .550. That only .009 clearance. Most guys like to have .040-.060 of an inch clearance. If you were running 1.6 you would have .040 and that would be OK. But .009 is really close. You may get away with and you may NOT. I imagine some guys are running them same setup and will tell you that it is ok. BUT WILL THEY PAY FOR YOUR PARTS WHEN YOUR MOTOR GRENADES ITSELF. You could sell the old springs to make some of your money back.

It's up to you but if it were me. I would get a better set of springs or run 1.6 rockers.

To figure out lift of the cam with a certain rocker. Take your lift # with 1.6 and divide by 1.6. And then multiply the number you get by your new ratio.

.500 / 1.6 = .3125.........3125 X 1.7= .531

Matt90GT · Jan 26, 2004

D347643 said:
they say the twisted wedge springs are good to .550 stock so is that even worth taking the chance?

FYI from the TF website:

Valve Spring Upgrade Kit for OEM Small Ford Heads
This kit allows you to install a high performance cam of up to .542 in. lift on any 289-351W with OEM cast iron cylinder heads. The kit includes 16 each of 1.47 in. diameter valve springs with dampers (110 lbs. of seat pressure at 1.800 in. installed height), chromemoly retainers, valve seals, valve locks, spring shims, a spring height gauge, and instructions.

TFS-2500100 Valve spring upgrade kit for OEM heads, each

mike keirstead · Jan 26, 2004

Matt90GT said:
FYI from the TF website:

Valve Spring Upgrade Kit for OEM Small Ford Heads
This kit allows you to install a high performance cam of up to .542 in. lift on any 289-351W with OEM cast iron cylinder heads. The kit includes 16 each of 1.47 in. diameter valve springs with dampers (110 lbs. of seat pressure at 1.800 in. installed height), chromemoly retainers, valve seals, valve locks, spring shims, a spring height gauge, and instructions.

TFS-2500100 Valve spring upgrade kit for OEM heads, each

He is not running OEM heads. He has Twisted wedge.

D347643 · Jan 26, 2004

damn the stage 1 doesnt seem as appealing with only .499 lift haha ive heard it has a nice lope to it

D347643 · Jan 27, 2004

doesnt it?

bock · Jan 27, 2004

I run a f-303..... .512 lift , 226° duration.... have a nice lupala lupala....

stage 1 cam and 1.7 rockers, pushrod length?

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