1.7 rockers any that fit

[geldartb]

looks like it will be the 1.65 ones then. snd the 3800 ones dont fit already tried, when you tighten em down they open the valve a 1/4 inch.

[torq455]

someone should get an LS7 rocker and experiment with it to see if it could be moded to fit.

[geldartb]

ill get a couple gmparts they are like 20 a piece shipped.

[Joseph Upson]

LS7 rockers are completely wrong. The stem to pivot distance is incorrect. They wont even work on a Gen I or II small block Chevy. Plus if you notice any LS7 or L92 head uses an offset intake rocker in order for the pushrod to clear the massive intake port.

The offset intake rocker was acknowledged a couple of times, but if the end of the exhaust rocker doesn't line up with the valve stem head it doesn't matter that it can be bolted to the cylinder head. I'm not sure about the 07 3500 and 3900 which uses rockers that do not retrofit to the previous engines and look a lot like the LS7 rockers. The 3900 cylinder heads are designed after the LS1 heads so unless someone has tried it maybe they will work properly with them.

[torq455]

how about these? http://www.compperformancegroupstore..._Code=V6ROCKER

[ForcedFirebird]

LS7 rockers are completely wrong. The stem to pivot distance is incorrect. They wont even work on a Gen I or II small block Chevy. Plus if you notice any LS7 or L92 head uses an offset intake rocker in order for the pushrod to clear the massive intake port.

I'll have to measure later, but I compared a 3500 rockers to a set of 1.7 Ford roller tips, and they appear to have the same fulcrum to tip distance. Ford has always had a greater distance between the valve and rocker center. The problem would be converting the late heads to 3/8" studs, the earlier 3x00's had 10mm rocker mounting holes and Crane sells adapting studs to go to 3/8's threads that were made for the Gen1 to convert to SBC rockers. I will verify with a mic later and get back.

[geldartb]

what ford had the 1.7 rockers. maybe i can grab a few at the yard and do some experimenting.

thats how i found out the 3800 ones dont fit.

[ForcedFirebird]

what ford had the 1.7 rockers. maybe i can grab a few at the yard and do some experimenting.

thats how i found out the 3800 ones dont fit.

Ford came with 1.6 rockers. I bought these aftermarket, they are like going from 1.5 stock GM to 1.6, it's a common swap in Ford's (I have three Fords).

[Joseph Upson]

Has anyone looked into the efficacy of doing a rocker upgrade? I have a valvetrain book back home and I recall looking at a dyno run comparison posted in it that didn't show a significant enough amount of improvement to peak my interest and given that the engines come with a partial roller rocker it seems there is not that much more to gain by going full roller and a little more on ratio. For $350 I expect the kind of power improvement you would get for going from a stock exhaust to headers, or a cam and I don't see that kind of improvement coming from just a rocker change.

I would also be concerned about the additional load placed on the valvetrain, the 3900 and 07 3500 have 1.7:1 rockers on the short pedestal and part of that may be because of the additional leverage load on the rocker stud and may even call for stronger push rods since some of us are not able to stay out of the 7k rpm range.

[ForcedFirebird]

Everyone uses the term "full roller" when talking about the 3x00, I thought full rollers meant roller fulcrum and tip.

Joseph, I got these 4340 forged roller tips for a Ford (1.7) for $60 something.

geldartb, I just measured the Ford and 3500 rockers and the center of the fulcrum to tips are the same. The difference was filcrum to center of the pushrod. This means by getting the Crane adapting studs ($16 or so a pair, $96/set IIRC) and some 1.7 Ford roller tips (come with 3/8's nuts/pivot balls), they will work on the 3400 heads. Unfortunately GM changed the threaded hole in the latter years from 10mm to 8mm, and I don't think Crane offered them in 8mm.

Here's the set I bought...
http://cgi.ebay.com/ebaymotors/Ford-...spagenameZWD1V

^^^ They went up in price, I bought mine almost a year ago for $69 delivered

[ForcedFirebird]

Here's the studs I was referring to...
http://www.cranecams.com/index.php?s...&lvl=3&prt=114

[silvergtjrad]

http://www.lmperformance.com/6342/4.html

would those work? Not sure what length the theads need to be, but these have the 8mm base threads and 3/8 stud threads

[ForcedFirebird]

http://www.lmperformance.com/6342/4.html
would those work? Not sure what length the theads need to be, but these have the 8mm base threads and 3/8 stud threads

GOOD FIND! Now I just might have to get a set of those and will have 1.7 roller tips for my 3500 heads .

EDIT: Also those list with Comp for $96.48 LMP sells them less than the Comp online store by almos $30. You will have four extras, too.

[Joseph Upson]

Everyone uses the term "full roller" when talking about the 3x00, I thought full rollers meant roller fulcrum and tip.

Joseph, I got these 4340 forged roller tips for a Ford (1.7) for $60 something.

geldartb, I just measured the Ford and 3500 rockers and the center of the fulcrum to tips are the same. The difference was filcrum to center of the pushrod. This means by getting the Crane adapting studs ($16 or so a pair, $96/set IIRC) and some 1.7 Ford roller tips (come with 3/8's nuts/pivot balls), they will work on the 3400 heads. Unfortunately GM changed the threaded hole in the latter years from 10mm to 8mm, and I don't think Crane offered them in 8mm.

Here's the set I bought...
http://cgi.ebay.com/ebaymotors/Ford-...spagenameZWD1V

^^^ They went up in price, I bought mine almost a year ago for $69 delivered

That's what I mean when I say full roller; tip and fulcrum. What you are doing seems like a lot of work though, I think I would just try to get the extra lift from the cam. I'm still hoping the LS7 rockers will fit the 3900 heads properly as I'm still undecided on whether or not to bother the camshaft.

[ForcedFirebird]

Not a lot of work. Buy the studs and screw them in, I already have the 1.7 SBF roller tip rockers. As far as the cam, this means I can use a 262 (max you can get from a re-grind) for $59 from Delta for my 3.4 block (flat tappet).