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I'm in the final stages...shout have her together and a sexy little audio sample for ya's within 2 weeks
Alright! Another completed hybrid!!!
My long block should be finished next week sometime, but I still have to purchase the cam and install it (along with the MegaSquirt). The cam is going to be nice and big with around .550" lift and 282* of adv duration.
Russell, I am still perplexed as to how you were able to use the stock 3400 pushrods when the height of the hyd flat and hyd rollers are two different lengths, and there is no adjustment with the roller fulcrum rockers on the later gen3 3x00's?
Well...See that's the thing. i was talking with a friend of mine and i got to thinking that the 3400 was only partially me because the car was stolen and taken to a mechanic by my parents/fiance (g/f at the time) who didnt think i could get the job done quick enough. they wanted the car out of their front yard. needless to say i only got partially done when i found out that the car was being worked on by a mechanic.
the pushrods i got to work originally were from a 1996 Gen III 3100 engine (yes. the 1996 was a gen 3) that i pulled out of a junkyard. now, yes - i had the engine running initially with 3100 parts, and a 3.4L bottom end, making it an almost 3400/3.4 hybrid. differences were head design and valve size as well as rocker ratio (the original gen 3 heads before 99 used stamped steel rockers that were non-adjustable as well.)
everything ran great. the car was given to the mechanic with the heads (again...not my doing) and was given back to me. i have no idea what the mechanic did and when i get a minute or two (planning my !@#$ wedding atm) i will go out and measure my pushrods to see how long they are.
as far as i know they are stock gm pushrods, but i won't know until i measure them. i dont remember saying i used stock "3400" pushrods, only that i had bought a set of pushrods that were for the gen iii heads from GM for the inital build.
Well...See that's the thing. i was talking with a friend of mine and i got to thinking that the 3400 was only partially me because the car was stolen and taken to a mechanic by my parents/fiance (g/f at the time) who didnt think i could get the job done quick enough. they wanted the car out of their front yard. needless to say i only got partially done when i found out that the car was being worked on by a mechanic.
the pushrods i got to work originally were from a 1996 Gen III 3100 engine (yes. the 1996 was a gen 3) that i pulled out of a junkyard. now, yes - i had the engine running initially with 3100 parts, and a 3.4L bottom end, making it an almost 3400/3.4 hybrid. differences were head design and valve size as well as rocker ratio (the original gen 3 heads before 99 used stamped steel rockers that were non-adjustable as well.)
everything ran great. the car was given to the mechanic with the heads (again...not my doing) and was given back to me. i have no idea what the mechanic did and when i get a minute or two (planning my !@#$ wedding atm) i will go out and measure my pushrods to see how long they are.
as far as i know they are stock gm pushrods, but i won't know until i measure them. i dont remember saying i used stock "3400" pushrods, only that i had bought a set of pushrods that were for the gen iii heads from GM for the inital build.
1995 and 1996 used stamped steel adjustable rockers, that's where I got my pushrods for my engine (not complete yet).
I haven't compared them to the length of the 96-up or the 00-up lengths yet.
I did measure the base circle of a flat tappet cam, and a GenIII roller cam - also the Gen1/GenIII lifters and found that there is about a .020" difference between them, from the center of the cam to the top of the lifters.
For people using pre-02 heads, they have a 10mm rocker stud tap, and the iron head rockers and stud will bolt right in place of the pedistal style rockers. Then using rockers from the 94-95 GenIII, they will be adjstable and should take care of the ~.020 difference in pushrod length (and still have the 1.6 ratio).
As an alternative, ARP makes 8mm and 10mm to 3/8's adapting studs - then 3/8's SBC rockers can be used.
Congrats on the wedding :D I'm married with 4 kids.
...For people using pre-02 heads, they have a 10mm rocker stud tap, and the iron head rockers and stud will bolt right in place of the pedistal style rockers. Then using rockers from the 94-95 GenIII, they will be adjstable and should take care of the ~.020 difference in pushrod length (and still have the 1.6 ratio)...
the stamped steel rockers are 1.5 arent they? the ones i had were...unless you do the following:
Originally posted by Forced_Firebird
As an alternative, ARP makes 8mm and 10mm to 3/8's adapting studs - then 3/8's SBC rockers can be used.
I don't see any reason to muck with the heads. I'm using heads from a 2000 GAGT (thats what the ebay listing said) that were simply slapped on the car (no cleaning or anything...they probably need it) -- and everything runs great. im using the pedestal-style rockers too.
Originally posted by Forced_Firebird
Congrats on the wedding :D I'm married with 4 kids.
thanks. no kids in future plans yet...
back to the pushrods, something i wanted to add but apparently didn't - is that when i picked the car up from the mechanic, there was no line items on the invoice for any extra parts that had to be ordered by the mechanic, nor was there any mention of it while the car was being worked on (the guy would only call me as per my direction)
as far as i know, the pushrods i used to get teh 3100/3.4 setup working are the same pushrods that are in there now...
I know what push rods they are...and believe it or not your ALL wrong the ONLY ONLY ONLY ONLY pushrods that work are 89-91 3.1 fwd pushrods...the lengths are 6.042 and 6.389, I didn't mess with my heads either..not necessary
I know what push rods they are...and believe it or not your ALL wrong the ONLY ONLY ONLY ONLY pushrods that work are 89-91 3.1 fwd pushrods...the lengths are 6.042 and 6.389, I didn't mess with my heads either..not necessary
They are actually a little short with the pedistal rockers. Did you check the pre-load on them?
They should work fine for years to come, but you are not taking the full advantage of the cam profile - much like the FWD guys using a re-ground roller cam and stock p-rods. It's been done, but is not optimal.
hey F_F -- i know that guy. we've been talking a lot. he actually MEASURED his pushrods so im pretty sure he got what he could use. hes using all the right parts too...i've made sure of that...
They are actually a little short with the pedistal rockers. Did you check the pre-load on them?
They should work fine for years to come, but you are not taking the full advantage of the cam profile - much like the FWD guys using a re-ground roller cam and stock p-rods. It's been done, but is not optimal.
no they ARE correct I checked the pre-load and made sure. I spent a lot of time investigating them and they work
What method did you use to check the preload? It should be ~.010"
Knowing GM, I'm almost positive that the Gen1 and II lifters are the same for simple parts interchange, but now you are adding the non-adjustable pedistal mount to the equation. Are you sure that the base-circle-of-cam to top-of-pushrod is the same on a GenII as a GenII hybrid? As long as the center of cam to the top of the pushrod hasn't changed in a GenIII, then this would be correct.
I need a couple more measurements from the stock GM parts and a judgement call will be made for my motor. Can't have anything go wrong - looking for 500+hp once the boost is back on.
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