will this cam be to big for my 305
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From: w. boylston mass
Car: 91 formula
Engine: 305
Transmission: t5
will this cam be to big for my 305
Originally posted by BADASS355CIZ28
hey guys i have a brand new solid roller cam for a sbc
260/258 duration .546 int .539 exh lift 109 lobe center
i will let this brand new cam go for $100.00 pm me or let me know if your interested. mongo
hey guys i have a brand new solid roller cam for a sbc
260/258 duration .546 int .539 exh lift 109 lobe center
i will let this brand new cam go for $100.00 pm me or let me know if your interested. mongo
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Joined: Jul 2003
Posts: 4,803
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From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
It may or may not be. Is that duration seat to seat or at .050" of tappet lift? Makes a big difference. But since its a solid roller i would not be suprised if its at .050" tappet. in which cse, yes thats WAY too big for your 305. ANd in the case that that is duration at .050", it will be stalling at at LEAST 3200-3500, if not more.
Either way, if you DO run it, which if what i said above is true, and it will be going against all that is logical, you will need new lifters. ones that look like these:

Those are solid roller lifters made by Isky.
The other big thing is you will need new springs and reatainers to fit them. Such as these:
Those are the Isky 9915 springs with matching Super 7 degree retainers. And no, you cannot be cheap and re use your old springs. The ramp rates of the solid roller are designed to be the most aggressive of any camshaft type. That aggressiveness will simply over-tax any spring that isnt up to par.
I would then recommend some high strength pushrods to withstand the force as well as all the other goodies. A solid roller valve train is probably the most expensive setup that you could run. For example, i ran a hydraulic roller for a while, then made the change to a solid roller. Despite all the parts that i had for the hydra roller, i still ended up getting a whole new valve train consisting of:

It wasnt a cheap setup. It costed more than a hydraulic roller setup. So, i guess, the moral of my story is this: Is the duration you listed at seat to seat? Or .050" of tappet lift? But since im assuming it is .050", it will be way to big for youre 305. Well it isnt way to big, it just wont have any streetability whatsoever considering as how its a top end cam designed to most LIKELY operate under circle track conditions
Either way, if you DO run it, which if what i said above is true, and it will be going against all that is logical, you will need new lifters. ones that look like these:
Those are solid roller lifters made by Isky.
The other big thing is you will need new springs and reatainers to fit them. Such as these:
Those are the Isky 9915 springs with matching Super 7 degree retainers. And no, you cannot be cheap and re use your old springs. The ramp rates of the solid roller are designed to be the most aggressive of any camshaft type. That aggressiveness will simply over-tax any spring that isnt up to par.
I would then recommend some high strength pushrods to withstand the force as well as all the other goodies. A solid roller valve train is probably the most expensive setup that you could run. For example, i ran a hydraulic roller for a while, then made the change to a solid roller. Despite all the parts that i had for the hydra roller, i still ended up getting a whole new valve train consisting of:
- Isky Camshaft
- Isky Lifters
- Hatfield Racing pushrods
- Isky rev kit
- Comp pro magnum rocker arms
- Isky 9915 springs
- Isky Retainers and locks to match the springs
- Cloyes billet timing set
- Comp polymer distributor gear
- and a bunch of little odds and ends
It wasnt a cheap setup. It costed more than a hydraulic roller setup. So, i guess, the moral of my story is this: Is the duration you listed at seat to seat? Or .050" of tappet lift? But since im assuming it is .050", it will be way to big for youre 305. Well it isnt way to big, it just wont have any streetability whatsoever considering as how its a top end cam designed to most LIKELY operate under circle track conditions
Last edited by Stekman; Apr 24, 2004 at 10:22 AM.
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