Cam Question

[Superdave]

Given the low redline on the engine I am sure you can get away with some stock lifters.

the cam is going in a '00 3400

[Syn]

Given the low redline on the engine I am sure you can get away with some stock lifters.

the cam is going in a '00 3400

so you have to use the gen II lifters correct?

[BillS]

so you have to use the gen II lifters correct?

Yup that would be the case.

BTW, I can't see that going to boost makes any difference. If the engine were a 7000 RPM screamer, you'd want to look at the best anti-pump up lifters. For the rather mundane 5500 - 6000 that most of the V-6s run, it isn't a big problem.

I'll let you know how the 272 works out - in my application (sub-2000 pound car) I am happy to give up some low end torque in the interest of keeping the MG diff in one piece. In a Fiero, or more so in a heavy Camaro, you'd want to hang onto that torque, I would think.

[TurboZ24]

Has anyone attempted too swap the Gen III block back too a flat tappet cam? Isn't the bearing section at the timing chain cover area different, due too the thrust plate on the 3rd Gen vs 2nd Gen?

Why would you use a Gen III block instead of a Gen II if you want too run a flat tappet cam?

[BillS]

Why would you use a Gen III block instead of a Gen II if you want too run a flat tappet cam?

Excellent question!

Plus on the Crane cam you lose the bump for the cam position sensor if you are running SFI (or at least I believe you do)

[geoffinbc]

Yes you do loose it. That cam will not operate the SFI. The cam however should work without any problems in the block. The Gen III block does have advantages over genII. Priority main oiling is a big one. There is also the cross bolts in the mains aswell which helps to stabalize the bottom end.

If it were me though I would not give up the roller cam. I would get a regrind. It would be cheeper and be more powerful.

[Superdave]

Yes you do loose it. That cam will not operate the SFI. The cam however should work without any problems in the block. The Gen III block does have advantages over genII. Priority main oiling is a big one. There is also the cross bolts in the mains aswell which helps to stabalize the bottom end.

If it were me though I would not give up the roller cam. I would get a regrind. It would be cheeper and be more powerful.

true... but after seeing how flimsy the stock cam is (since mine is in 2 pieces) i want something a little more solid.

the oiling is part of the reason i didn't build a hybrid, also i wanted the larger displacement and an overall newer block.

the flat tappet cam will work fine in the 3400 block, i'll need custom pushrods (probably the same size as the hybrid would use) and a cam button. I have a few of those laying around from some other projects tho...

[geoffinbc]

The cam aint flimsy. Your cam broke because it siezed in the bearings. You dont think a cast iron cam would do the same?

It was either the cam or the chain that was going to break.

[TurboZ24]

I know people talk about the 3 oil galleries and the cross bolted mains, but I've had no issues with my Gen II block.

As for a thrust button, you don't need one on a flat tappet cam, the lifters themselves keep the cam in position. You can add one if you really feel like it. Take a SBC needle bearing thrust button, machine it down some, get the locker plate for a SBC (it bolts right up too the 3.1 cam sprocket). That's what I run.

[Syn]

you guys got the correct pushrod length for the hybrids using the roller rockers?

[geoffinbc]

Get a length checker.

[bszopi]

If you get a new cam from CamMotion, it is a solid core instead of the hollow. And then you can get whatever specs you want for it.

[TheProfessor]

my 272 came directly from crane and included lifter
and yes you can use a 3rd gen block with a flat tappet cam and lifters
youll just need onger pushrods