I have heard from many people that i will not be happy with the gains from shortie headers...im thinkin that any headers are better than the stock block ones that are on my truck (11998 silverado 5.7 350). i can get some brand new jba headers for 250 and i was wondering if should get those or wait and save more money to get some long tube headers... i also wanted to know what you guy's think of the thorley headers..

Thanks

 

Welcome.... Wait and save for the long tube headers. There are a few guys around here with the lt thorley headers.

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ok...do you think the thorleys are worth it or what type of other headers should i go with and how much will the run??

 

I don't have experience with thorlys. I do know of someone who just recently installed some gibson shorties on his 5.3 and was a bit dissapointed. Furthermore, a while back I read a thread where they dynoed a truck with shorty header and the difference was very minimal (4-5rwhp). Just save and go with long tube headers. I plan on getting some ASM's in future but there are other brands you choose from. Oh.. long tubes headers run from $500-750 depending on whichones you get.

File

 

i'm probably going witht the thorleys. but what is better, the true dual setup or single in setup?

 

With the older TBI motor, shorties will give you more of a gain than they will our trucks with the Gen III motor. Question yourself on how far you want to take this truck and then evaluate how much you want to spend.

 

well i plan on takin the truck pretty far... im glad i don't have a tbi though and do have a 5.7 vortec (98 silverado) which i think the headers are very similar to the tbi's...but i think im unsure what im gonna get but im leanin towards the thorleys...heres a list of current mods: 1998 chevy silverado.. 5.7 vortec 350
Hpp3, 160 thermostat, Tb spacer, airaid intake, 2 chamber flow master, 4/6 drop on boyd 18's 9.5 wide in rear 1.6 crane gold race roller rockers and upcoming mods are electric fans, slicks, headers, and a procharger (procharger to be ordered in about a week)

 

Your truck will still see better gain from shorties than ours. You should be able to find long tubes for your motor for under $500. If your planning on spending for a Procharger, definatly get the longtubes. Edlebrock and Thorley both make longtubes for under $450 and Jaradine makes a full set including a crossover (two piece longtube) for under $450 for your motor.

 

With a 5.7 you will have bigger selection of headers to choose from being a non-LS1 based motor.I would check around to see what was available in a longtube header.I think Edelbrock makes headers with wye-pipes for your application.Checkout headman and Blackjack headers to they may be cheaper.