hey guys,I currently have a 400(.040 over)small block with 5.7 stock rods.for confirmation,what are the benefits of 5.7 rods over 5.56 aside from piston wall,and also do i have to radius the rods for rod/block/cam clearance?thanks in advance for replies.

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87 IROC WITH 409(.040 OVER400) MINIRAM,NOS(125HP)TRICK FLOW PORTED HEADS,C.C.CAM,FLOWTEK HEADERS,CUSTOM PROM,MODIFIED 700R TRANS,2400 B&M CONVERTER,3.73POSI REAREND.
LOOKING FOR THE 11 SEC. ZONE.

 

longer rods due two main things 1 it reduces the amount of abuse on the walls of the cylinder and 2 it levels out the tq curve some by allowing the piston to stay at tdc longer and changes your rod to stroke ratio as well.from what i know a perfect rod to stroke ratio on an acceleration engine would be 1.74 some of the other guys may shed some more light on the subject

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87 trans am 350,L98 aluminum heads,LT4 hot cam,slp runners,slp 1 5/8 headers,3in.y-pipe,edelbrock base,hi flo cat,air foil,afpr,as&m ported plenum,t-5 tranny w/centerforce clutch and a 3.27 9bolt(11.9in. brakes),ed wright's fastchip,relocated iat sensor,tb bypass,accel supercoil,hollowed maf,slp 3in. catback,a/c delete.
oh!no!i think my maf is going!!!!!!!!!!!!

14.10@97mph w/2.01 60'

slp catback is finally on!!!
fastchip prom is in.OH!MAN!
FLOWMASTER S.U.C.K.S

 

The only thing I had to do was notch the hell out of my block for cleanance near the oil pan rails. Some were worse than others.



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Dan
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87 IROC-Z, 5.7,auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, Accel .219 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon- DFI, Dart Iron Eagle 200cc heads, 406" money pit

1987 Camaro Z28 - 5.2tpi, auto, 3.73s, ram air, airfoil, ported plenum, !cat, !tbcoolant, !smog, !4th gear

1989 Pontiac 20th Anniversary Turbo Trans Am - 161,000 miles, !cat, 9" K&N - SOLD

 

I had a dyno test in an old hotrod mag, where Joe sherman used a 400 putting out around 600 horsepower. Swaping the stock 400 rods for the longer 350 type rods. The long rods showed slighlty more topend power. Somewhere around 10 horsepower cant remember the exact figure. It wasnt much The shorter rods made a little more lowend torque.

They do reduce side loading of the piston. How much this actually reduces wear I dont know.



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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

thanks guys, appreciate the info .

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87 IROC WITH 409(.040 OVER400) MINIRAM,NOS(125HP)TRICK FLOW PORTED HEADS,C.C.CAM,FLOWTEK HEADERS,CUSTOM PROM,MODIFIED 700R TRANS,2400 B&M CONVERTER,3.73POSI REAREND.
LOOKING FOR THE 11 SEC. ZONE.