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Old 07-02-2012, 08:05 PM
joelster joelster is offline
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Quote:
Originally Posted by my87Z View Post
his 92' already has the stronger 7.625" rear in it with the 28 spline axles instead of the 7.5" with the 26 spline axles. you are right about the TQ arm and the control arms. before i started drag racing my current set up i had a 355 putting out about 390-400hp, I upgraded to a 7.625 rearend from a 91' and I never had any issues with it.

think about this, how many LT1 and LS1 camaro's are out there with a set of headers and exhaust, reprogramed, with an aftermarket intake and just some other bolt on mods. these cars are making about 400hp and still using the same 7.625" rearend. dont get me wrong these rearends are week and will likely be the weakest link on the car with 400+hp/tq but i've seen plenty handle this kind of power without any problems.
Not sure where you get this 7.625" information, but both of my LT1 cars came with a 7.5". EVERY LS1 car came with a 7.5 as well. I'm guessing that you are thinking of the oddball Borg-Warner rear that came in a few 3rd gens. Either way both are weak. Possibly with street tires, they will last a long time, but NO WAY at the track or street with a decent drag radial or a sticky DOT tire. Not a chance in hell. My friend grenaded his 10-bolt with a bone-stock LT1 car with a t56 and a set of BFG drag radials.
Quote:
Originally Posted by my87Z View Post
its the 7.5" rearend with the 26 spline axles which is so much weaker. after saying all this, i must say that with my old set up on my 385, my 7.625" rear didn't last 3 weeks. but it was also putting out 490tq.
They usually snap the teeth off of the ring gear and/or pinion gear when they go. People put a TA Performance girdle on them hoping they will get some life but that is money down the drain.

Quote:
Originally Posted by my87Z View Post
I am someone who believes saving the money and doing it right the first time so i understand what you are telling him. I just dont think that is what he looking for. for many people 400hp in a street car is all they will ever care to have. based on the parts OP picked, i assumed that he was on a budget that is why i suggested the iron RHS 180 heads, and believe it or not they actually flow 258cfm @ .500", these numbers came from an independant shop that has flow tested hundreds of different heads on their SF600. most $1000-1250.00 alm heads are right in that range with them so how much would that extra $200-450.00 extra for the alm heads acutally benifit him. they are lighter, but if he's not racing then the extra 50lbs will never be seen nor felt. now for the heating aspect. the alm heads will be easier to cool, but as long as he has a decent electric fan he wont have any problems with the irons heads, on my previous motor set up i used Dart 200cc platinum iron heads and i never had any issues with keeping the motor under 190.
The cooling of the engine is a benefit but the main thing is the ability to up the compression ratio and not detonate. That is something that is FREE that cannot be ignored. Put an iron head on a 383 and run it at 11.5-1 and try to run pump gas. You will have to tune it pig rich and take timing out.

Quote:
Originally Posted by my87Z View Post
Yes, would a set of AFR 195's, Brodix IK200's, or Dart pro-1 200's along with a hyd roller cam be his best option for making more power, absolutley. with these he would likely make 50-75 more hp all day but he would also spend another $1500.00 doing it.

Sometimes you have to make recomendations based on what you believe the OP wants, not what you would want.
I could piece something together for not much more $$$ and make it much more enjoyable. IMHO vortec heads do not belong on anything over 355 cubes. They simply don't have the ability to feed it correctly. A 355 with a head flowing over 250 will crap all over a 383 on vortec heads. It would cost a lot less too being able to keep the rods, and crank and not needing as much machining. He's going to run a 650 dbl pumper which can support 450+hp, and an Edelbrock Performer RPM intake which can go well over 500hp, and then crutch the build with some tiny heads trying to feed 383 cubes.
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