Rocker arm ratio

[Tom 400 CFI]

Does anyone know the stock RR for the 290-401 rockers? I'm going to try to run some small chevy roller rockers on a 401 I'm putting together for my J-20, and on my mockup, I am losing lift with the Chevy 1.5 roller vs. the stock rocker. Is the stock piece a 1.6 ratio? Also where can I get guide plates for this thing? it has the post '73 heads. Thanks.

------------------
'83 J-20...Saved it from the crusher!

[Ralph]

Do a web search for Michael Baxter's homepage. He's got a list of interchangeable engine parts. I think SB Ford rockers will work in an AMC V8, but I don't know about roller rockers. Summit lists aluminum Harland Sharpe roller rockers for AMC V8, pricey though.

------------------
J ust
E mpty
E very
P ocket

[Dave]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Tom 400 CFI:
Does anyone know the stock RR for the 290-401 rockers? I'm going to try to run some small chevy roller rockers on a 401 I'm putting together for my J-20, and on my mockup, I am losing lift with the Chevy 1.5 roller vs. the stock rocker. Is the stock piece a 1.6 ratio? Also where can I get guide plates for this thing? it has the post '73 heads. Thanks.

<HR></BLOCKQUOTE>

The stock ratio is 1.6. Aftermarket rocker arms for a small block chevy, chrysler 318 & 360, and Ford 221,289,302, & 351w, will fit if you use the 1.6 ratio, 3/8 screw in studs, guideplates, & hardened pushrods that are the correct length.
Try http://store.summitracing.com/ http://www.compcams.com/ http://www.cranecams.com/ they all make rockers for us.


I heard Isky adjustable guideplates would work, so i bought some, didnt like the way they fit, ended up getting some from american performance http://www.oldcarparts.com they were expensive about $90, but they were a perfect fit.

------------------
Dave
79 Wagoneer
Built 360
400 with p/t QT
Dana 44's w/3.73's
Ft.TrueTrac/RR. Locker
4" susp./ 3" body
33"x9.5" Buckshots
http://briefcase.yahoo.com/bc/fsj79w
"Gas, Grass or @ss - nobody rides for free"

[Gladi8r]

http://ourworld.compuserve.com/homepages/MBaxter/

------------------
DON

1988 GW mostly stock, &lt;---Wifey's truck (won't let me "fix it up")

1971 J-4000,Rhino Grille(to be installed)
360 CID 2v, 245 HP, 365 ft/lb
T-18A, Dana 20, PTO, DANA 44 (Front/Rear)
71 Gladiator Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld2&.src=bc)

78 GW (parts truck)
360 4v Th400
Dana 44 F/R
78 Wagoneer Pics (http://briefcase.yahoo.com/bc/gladi8r1971?d&.flabel=fld3&.src=bc)

[Tom 400 CFI]

Thanks for the replies. 1.6 eh? Well that's why I'm not getting all the lift from my 1.5 chevy rockers. Thanks for the links too, especially the american performance one.

------------------
'83 J-20...Saved it from the crusher!