Identifying 3500 heads & block choices

[Lilchief]

OK couple of questions here. What is a easy way to identify 3500 heads, including casting numbers (non VVT). Second question. I have a choice of 2 blocks for my hybrid, 3.4 or 3400. Going to have custom pistons made so that will not be an issue. Also going to use a 7730 (?) ECM. This will be going into my 85 Fiero. I would also like to use my 88 oil pan and timing chain cover. What would be your decision between the two and your pros and cons?

[bszopi]

If you want to use the 88 pan, then you MUST use the 3.4 block. A steel pan will not bolt up to a 3x00 block.

[IsaacHayes]

The 3400 block has much better oiling system though and can run a roller cam...

[Lilchief]

I've done some more research and found I can use a 88 timing cover on an 3400 block but will have to use the aluminum oil pan. Would there be any issues with an 88 fiero cradle? How much advantage is a roller cam over a flat tappet cam hp wise using identical profiles. Next question is on the timing chain it self, can I use a Cloyles true double roller or is it something still in the making?

[IsaacHayes]

You can use the double roller for the iron head 3.4L block, but not on the 3400 unless you buy the WOT kit and machine the crank and timing cover to clear it (fwd tc).

There is a single roller in the works for the 3400 that won't require maching in any parts though.

Roller cam means less friction, less wear, etc.

[Joseph Upson]

I believe the ability to provide a more aggressive valve lift rate out weighs the reduced friction. You end up with more area under the curve for the same duration. Rollers don't lift the valve off the seat as fast as a flat tappet but they excel beyond the flat tappet after that.