Hi guys, im new here, someone recommended i ask around here, you guys might be able to help me.

im currently building a 350 engine for my 85 Iroc-Z. what im doing isnt anything major. one question i got is, im putting in a performance hydraulic cam and lifters. now on top of that im bolting on some Vortec heads, my question is will me using the stock pushrods be ok to use?

another question i have. with this 350, and a upgraded cam (Comp Energy 256), Votec heads, and vortec intake. will my stock T5 tranny be able to handle this power? im having doubts about this. is there anyway to beef it up?

I really appreciate any information you guys can give me.

Thanks
Mario

 

I would not put stock push rods in a stock motor, let alone anything intended to be "high performance" in any sense of the term.

The T-5 thing will depend on how you drive it. You can (or at least, I sure can) kill them easily with a stock 305. You can (or again, I can) also make them last behind a strong running 400. It's all in driver technique. The thing that kills them is shock loading: big clutch dumps into sticky tires, and speed shifting. Avoid those things and it will probably last a good while for you.

 

Welcome aboard.

The pushrod length will be the same as pre'-86 flat tappet hydraulic lifters. If you use guideplates, they should be of the hardened type. You probably won't use guideplates, though, unless you have the heads modified for screw-in studs, so you need to use self-aligning rockers (in case you didn't know that).

The T-5's days are probably limited. Check the tranny/drivetrain forum for more on that topic.

 

Hmmm i thought i could use the stock pushrods, anyways if it helps its a block from a late 80s GMC Vandura casting numbers indicate 87 and up.

 

Are you going to use flat-tapper lifters, or roller lifters? The pushrods are different lengths. The block may or may not be machined for rollers.

RB is suggesting getting new aftermarket parts. They aren't that expensive.

 

they are flat tappered lifters, they arent roller. i was told by a friend that the stock rods wont cause a problems, thanks for the help guys.

 

Stock what? Depends what engine they came out of.

With flat tappet lifters/cams, it's a good idea to replace the pushrods when changing cam/lifters/rockers. They develope a wear pattern with their mating parts, and putting them between the new parts can cause premature wear.