3rdgen Fbody with 3500 heads

[95crackedhead]

forced, what will you be doing for fuel tuning? megasquirt?

[ForcedFirebird]

a long duration cam will decrease the dynamic compression of the engine.

with 3500 heads on a 3.4l, 11.5:1 compression, it should be fine on premium with some good tuning.

According to the CR calculator here, 3500 heads and 3.4 pistons should get 11.16:1. Mine will be less because of removing a little material in the chambers.

[sharkey]

a long duration cam will decrease the dynamic compression of the engine.

with 3500 heads on a 3.4l, 11.5:1 compression, it should be fine on premium with some good tuning.

[ForcedFirebird]

i.e. a cam that has enough lift so that at lower rpms there would be less cylinder pressure?

The valve can stay open longer to allow some of the compression to escape.

[95crackedhead]

i.e. a cam that has enough lift so that at lower rpms there would be less cylinder pressure?

[ForcedFirebird]

why would running that higher 11.5:1 compression be inadvisable in a daily driver setup?

Possible detonation on pump gas would be the main reason. With the proper cam, the CR could come down to acceptable levels.

[95crackedhead]

why would running that higher 11.5:1 compression be inadvisable in a daily driver setup?

[ForcedFirebird]

The 3.4 has a reluctor wheel cast into the crank with a mounting location for the trigger in the block, and I'm going to hook it up to MegaSquirt.

If you mean you are planning on using the entire FWD engine, it's quite a bit more complicated than using a 3.4RWD block and 3400/3500 heads. 3500 heads will give you 11.16:1 compression (3500 gaskets) with the RWD pistons, but 3400 (FWD) pistons will work fine witrh either the 3400 or 3500 heads.

[sharkey]

that is a 3500 intake. to use aluminum heads you require DIS ignition.

[NArtissimus]

Hey I got a quesion for you. I'm looking at doing a 3.4 aluminum head (LA1 FWD) into my 88 Camaro, but I'm trying to figure out what to use for an intake. I can't use my cast head 2.8 intake because it won't match the heads, and I can't use the 3.4 intake because it won't allow space for my distributor. What are you using for a distributor with that intake? And what is that intake from? Maybe I can use the same setup in my project...
Thanks, Art

[loner666]

i have a whole set of those yellow LS6 springs if i ever get off my ass and finish removing them from the heads..PM me if you want them as i have no need for them

[ForcedFirebird]

I got too many rusty springs off ebay to consider it a good source. New in bags...with rust on them.

Thanks for the tip. What does GM charge (their parts direct catalog is still down)?

[SappySE107]

I got too many rusty springs off ebay to consider it a good source. New in bags...with rust on them.

[ForcedFirebird]

NICE! I didn't know it could be modified that way to clear the 3500 upper but that might be easier than grinding the head down (which does work too).

What springs are 65 new?

Thanks . The partner who actually owns the shop suggested I mill the heads, but I refused.

Yellow springs are all over the place for $65-$75.

EDIT: Click here

They are about $7 or less, each, everywhere I looked.

[SappySE107]

NICE! I didn't know it could be modified that way to clear the 3500 upper but that might be easier than grinding the head down (which does work too).

What springs are 65 new?