3rdgen Fbody with 3500 heads

[SappySE107]

The fit around the guide is the problem. The 318 need to be shaved on the ID to fit the guide easier. The 2.2 seals are direct fit. I have no idea why you would want to run all exhaust seals though. I used intake and exhaust from the 2.2.

[ForcedFirebird]

What exactly is the advantage to using 2.2/318 seals? I measured the 2.2 Cavi seals against 3500 seals and they appear to protrude above the guide the same amount (~.15"). Am I missing something? Are the press-on seals just better then the insert type?

I also noticed the install height, do we need the shims? Is that just to give more seat pressure?

Sorry about the noobish questions, but I have searched for a solid answer and there is conflicting information.

[loner666]

Blew it because the valves were stying slightly open, or because another issue?

Everything is getting measured at final (*fingers crossed*), but if I know what to look for now, it will make it easier in the end. The 3.1 and 3.4 use the same lenght pushrod, and to my knowledge the cam to deck height hasn't changed from the 3.1 to the 3500, but I'll get back once I'm that far.

Just picked up the 3400 exhaust gaskets today, and while I was there, ordered a set of Cavi seals, and loner666 sold me a set of '02 3400 heads with LS6 springs on them with a bent valve and stripped rocker stud on each. Didn't think it was a good idea to try and use the seals after bent valves were pushed through them, lol. Also picked up a set of the 3400 metal LIM gaskets so I can re-build the heads and port them for someone

'03 not '02..lol..doesnt make much difference i know..glad you picked up seals..i hated those 318 seals at are on there..they leaked since they day i started the car

[Superdave]

He never clarified what happened.. and then he dissappeared.

[ForcedFirebird]

Yep, same length...


hmm, i know the 3400 top end on a 3.1 block with the flat tappet cam required custom pushrods to get the propper preload. There was one guy that swore the 3400 ones were "close enough" but iirc he blew the engine after a month of driving and went to a full gen3 after that.

I'd measure it either way, geometry is important..

Blew it because the valves were stying slightly open, or because another issue?

Everything is getting measured at final (*fingers crossed*), but if I know what to look for now, it will make it easier in the end. The 3.1 and 3.4 use the same lenght pushrod, and to my knowledge the cam to deck height hasn't changed from the 3.1 to the 3500, but I'll get back once I'm that far.

Just picked up the 3400 exhaust gaskets today, and while I was there, ordered a set of Cavi seals, and loner666 sold me a set of '02 3400 heads with LS6 springs on them with a bent valve and stripped rocker stud on each. Didn't think it was a good idea to try and use the seals after bent valves were pushed through them, lol. Also picked up a set of the 3400 metal LIM gaskets so I can re-build the heads and port them for someone

[Superdave]

are the 3400 pushrods the same length as 3500's? Russel used 3400 rods in his 3.4/3400 swap...

(post #150) http://forum.camarov6.com/showthread.php?t=64963&page=4

Yep, same length...


hmm, i know the 3400 top end on a 3.1 block with the flat tappet cam required custom pushrods to get the propper preload. There was one guy that swore the 3400 ones were "close enough" but iirc he blew the engine after a month of driving and went to a full gen3 after that.

I'd measure it either way, geometry is important..

[ForcedFirebird]

they are different height, you'll need custom pushrods.

If you feel like risking it, the measurements for the FWD "Hybrids" have been posted before but i guess it's best to measure with the propper tool.

are the 3400 pushrods the same length as 3500's? Russel used 3400 rods in his 3.4/3400 swap...

(post #150) http://forum.camarov6.com/showthread.php?t=64963&page=4

[IsaacHayes]

IIRC pushrod length didn't change only hardened ones for the early ones that used guides, but I could be wrong. No idea on the lifters. So the 1.7 rockers didn't work out? But you have different block than a 3400 so that might be different... Not sure of the stock cam in the rwd 3.4

[Superdave]

they are different height, you'll need custom pushrods.

If you feel like risking it, the measurements for the FWD "Hybrids" have been posted before but i guess it's best to measure with the propper tool.

[ForcedFirebird]

Are the flat hyd lifters in the 3.4 the same height as the hyd rollers in the 3500's? Now that I know I need to use the 3500 rockers and don't have adjustment, they have to be exact, correct? I have a set of pushrods from a 95 3400, and would be very happy to know they'll work. Rather not wait until final assy to get pushrod length.

[johnnymossville]

Cool, I just didn't know if I was doing something wrong. That should give you more N/A power. lol

[ForcedFirebird]

Forced, what figures did you use to calculate the CR to get 11.16:1? When I use the CR calculator here with the specs that they have for the 3.4 pistons and the 3500 heads (I have them as 32.4 cc chambers) I keep coming up with11.56:1. I like your figures (11.16:1) as this is a more streetable CR, and a little chamber smoothing would even lower figure a bit.

Did you use the .060" compressed height head gaskets with a 3.80" fire ring (gasket bore) for the 3500? Since I bought the gasket kit set, these are what I came up with. Also the chambers are getting modified a little bit, so I should be below 11:1 with the Camaro pistons.

EDIT: Your right! I must have entered something wrong. I came up with 11.5:1 this time.

[johnnymossville]

Forced, what figures did you use to calculate the CR to get 11.16:1? When I use the CR calculator here with the specs that they have for the 3.4 pistons and the 3500 heads (I have them as 32.4 cc chambers) I keep coming up with11.56:1. I like your figures (11.16:1) as this is a more streetable CR, and a little chamber smoothing would even lower figure a bit.

[ForcedFirebird]

Finally the short block is here! Cyl walls look good, and still have the factory x hatches. Refresh this puppy, and I should be ready to go (after some elbow grease and paint, of course).

I just can't believe how much more rust is on this block than the 3.1, but that's the difference between NY and FL . Thnaks Ninty4Three4 for the good hookup, this was less than buying an engine local - including delivery - and I know his car was running fine when it was removed.

[ForcedFirebird]

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

Yep , so isn't Sharkey.