I dunno if yall remember..but I bought a 350 a while back and made it to a 383. I got a good offer for it and sold it. Now i went and bought another 350.

What do yall recommend that i do with a 2 bolt main 350. It needs to be machined,cleaned and the rest. I want to keep the 350 crankshaft. but not the factory one...one that will not flex. bore it .30" over. I think that would be a 355. anyways...how high RPM do yall think a 355 can handle? and HP also?

ALSO,what is a 377? litre?specs? are they common?any advantages over a 355 or 383?

Thanks in advance.

 

I think a 377 is a destroked 400 (not sure)

but I believe a 377 is 6177cc or 6.2L

I don't know of any benefits except saying it is a 377??

Hopefully someone else has more knowledge/experience with this situation.

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1989 Trans Am GTA

 

377s are made up with the leftover parts from all the 383s being built . The block is a 400 and the crank is a 350 with some type of spacer bearing to make up for the different main journal size of 350s and 400s. But, unless you really need some outragious rpm (7500+), a 377 is not really the best way togo.

Chevy hiperf had a dynotest of two identical motors. One was a 383 and the other a 377. The 383 had about 4ft/lbs more torque below the torque peak and the 377 had about 4 more hp above the peak of the 383. If you don't take advantage of the rpm advantage that you can get from a 377 (bc of the shorter stroke), there is no sense building one. Go with something that has more torque and that will last bc you won't have to spin it very high to get the car rolling. (like a 400)

[This message has been edited by jcb999 (edited October 18, 2001).]

 

You can also make a 377 by using a 400 crank in a 350, but don't bore it .030. It is about the same as a 383 just a smaller bore. The other 377 (400 block, 350 crank) makes for a high winding engine, much like the 302, or 327 SBC. Some guys around here use these in hobby stock racing, and have made them live to see 8500rpm. I have witnessed this.



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Joshua Johnston
1991 Z-28
350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust, Dynomax Bullet Mufflers, T&R Motorsports custom air intake, Bald tires