5.0 TBI question
11-21-2004, 06:12 PM
#1
5.0 TBI question its a Chevy 305 TBI & came w/ 170hp stock. im looking to add around 30-40hp. Do you think i can do it with the following parts: K&N, TB spacer, removal of egr-smog stuff, 160 stat, march pullies, Heddman full length hedders into custom 2 1/2in or 3in x-pipe with turn downs, Edelbrock Power package for TBI motors which is Edelbrock performer manifold & Edelbrock cam .420/.442 204/214 LSA unknown but guessing 114 and some dyno tuning.
11-21-2004, 07:00 PM
#2
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egr will not affect wot performance
i would suggest the afr 180 cc heads, a crane "2030" compucam, full length headers, 2-1/4 duals with x pipe, holley intake (wider powerband), 2 inch throttle body, and a 160 stat.
the march pulleys made no diff on my 355 tbi, the tbi spacers are limited on a thrid gen f-bod due to hood clearance.
ihave a ported and filled stock tbi truck intake with 2" jegs tbi adapter that runs as well at the track as a ported edelbrock perfomer 4 barrel w/ tbi->4 bbl adapter plate
with all these mods i would highly recomend tuning
i would suggest the afr 180 cc heads, a crane "2030" compucam, full length headers, 2-1/4 duals with x pipe, holley intake (wider powerband), 2 inch throttle body, and a 160 stat.
the march pulleys made no diff on my 355 tbi, the tbi spacers are limited on a thrid gen f-bod due to hood clearance.
ihave a ported and filled stock tbi truck intake with 2" jegs tbi adapter that runs as well at the track as a ported edelbrock perfomer 4 barrel w/ tbi->4 bbl adapter plate
with all these mods i would highly recomend tuning
11-24-2004, 08:16 PM
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my brother and i were talking about it today and desided if you are going the far just get a cheap 383 and swap to 195 afr heads and 2-1/2 exhaust.
everything else the same it works good in his tpi car. 13.8 @ 99 with 2.73 gears and no tuning!!
everything else the same it works good in his tpi car. 13.8 @ 99 with 2.73 gears and no tuning!!
11-25-2004, 08:20 PM
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I would definitely go with the exhaust and the spacer. The biggest hp limiting factor on the tbi engines are the heads they simply don't flow good. A set of vortec heads may be a good option. Stay away from castings 906 as it has a thicker exhaust seat. Just watch your valve guide to retainer clearance as well as coil bind on the springs. TPI specialties or Turbo city would be a good place to start on getting a chip suited to the cam you pick. Comp also has some good TBI cams(put one in my brothers 91). A good ported tb or the 2 inch version will help. Just noticed that you are in Enterprise, I'm over here in Opp. You go to any of the gatherings at Sonic or anything. I'm always up for meeting other car guys. Let me know if you run in to any troubles with your project or know of any car gatherings over that way. Later.
11-28-2004, 11:43 AM
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Originally Posted by 01tam6
I would definitely go with the exhaust and the spacer. The biggest hp limiting factor on the tbi engines are the heads they simply don't flow good. A set of vortec heads may be a good option. Stay away from castings 906 as it has a thicker exhaust seat. Just watch your valve guide to retainer clearance as well as coil bind on the springs. TPI specialties or Turbo city would be a good place to start on getting a chip suited to the cam you pick. Comp also has some good TBI cams(put one in my brothers 91). A good ported tb or the 2 inch version will help. Just noticed that you are in Enterprise, I'm over here in Opp. You go to any of the gatherings at Sonic or anything. I'm always up for meeting other car guys. Let me know if you run in to any troubles with your project or know of any car gatherings over that way. Later.
the vortec heads are a good choice just stay under .480 valve lift. not all 906 heads are bad only some, u just gotta know what they came off of, only the 3/4 or 1 ton trucks got the hardened seat iirc. o nad stay away from edelbrock cams they suck, if u do go with vortec heads u will need a special intake for them, gm makes one for the tbi as does edelbrock.
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11-28-2004, 03:19 PM
#8
[QUOTE=01tam6] Just noticed that you are in Enterprise, I'm over here in Opp. You go to any of the gatherings at Sonic.
Yeah i go up to the "hang out" costal car wash by sonic all the time but havent made it to a cruise-in at hots deli in a while. Actually havent been out for 6weeks due to my broken back. I was thinking either get some kintake/cam package to work w/ the tbi setup or just swapping over to a carb setup w/ intake & cam. Either way, im adding 1 5/8in hedders, ory, and 3in exhaust, gears, Spec clutch, short-throw as well as a crank pulley,custom TBI chip(if dont go w/ carb) and some kinda duel snorkel intake, TB spacer and k&n. I just want to get about 220-225hp at the flywheel and be very reliable. Would i need any fuel upgrades? I set a budget for $2000 so i might not have enough for heads. Which ones are 906 castings? I hear factory 305 H.O. heads are really good and could maybe get a set at a swap meet. Does anyone else besides holley( incase they dont make em anymore cuz i havent found any on the internet) sell better TBI throttle bodies or do you have to home port? Maybe im fighting an uphill
Yeah i go up to the "hang out" costal car wash by sonic all the time but havent made it to a cruise-in at hots deli in a while. Actually havent been out for 6weeks due to my broken back. I was thinking either get some kintake/cam package to work w/ the tbi setup or just swapping over to a carb setup w/ intake & cam. Either way, im adding 1 5/8in hedders, ory, and 3in exhaust, gears, Spec clutch, short-throw as well as a crank pulley,custom TBI chip(if dont go w/ carb) and some kinda duel snorkel intake, TB spacer and k&n. I just want to get about 220-225hp at the flywheel and be very reliable. Would i need any fuel upgrades? I set a budget for $2000 so i might not have enough for heads. Which ones are 906 castings? I hear factory 305 H.O. heads are really good and could maybe get a set at a swap meet. Does anyone else besides holley( incase they dont make em anymore cuz i havent found any on the internet) sell better TBI throttle bodies or do you have to home port? Maybe im fighting an uphill
11-28-2004, 09:00 PM
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My mistake fast98 thought all 906's had the different seat. 906 is the last 3 digits in the casting# on top of the head and 906 can also be found cast into the bottom of one of the intake ports. Go to turbocity.com for 454tb's or they have ported stockers and custom chips too. With the parts you have listed you will reach your goal easily.
11-28-2004, 09:37 PM
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Originally Posted by 01tam6
My mistake fast98 thought all 906's had the different seat. 906 is the last 3 digits in the casting# on top of the head and 906 can also be found cast into the bottom of one of the intake ports. Go to turbocity.com for 454tb's or they have ported stockers and custom chips too. With the parts you have listed you will reach your goal easily.
11-29-2004, 12:52 PM
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Originally Posted by Wicked_Hugger99
Would a set of factory 5.0L H.O. heads off of an 84 Z28 work well with the TBI setup and proper intake/cam?
12-02-2004, 01:59 PM
#16
Originally Posted by Wicked_Hugger99
If i dont do the cam/intake and just did all the bolt-ons i listed w/ a custom TBI chip, how much power do you think id gain over the stock 170hp rating? At least 200hp at the flywheel?
12-02-2004, 03:23 PM
#17
Cool 200hp is just fine for a daily driver and should be enough to handle some of the imports and a maybe even few stock GT mustangs from 87-98. im just gonna do that for now and then do the intake/cam or maybe swap to a carbbed 335stroker. How much would a 300hp 335stroker( carbbed) w/ good parts cost to build do you think?
12-02-2004, 09:57 PM
#18
Originally Posted by Wicked_Hugger99
Cool 200hp is just fine for a daily driver and should be enough to handle some of the imports and a maybe even few stock GT mustangs from 87-98. im just gonna do that for now and then do the intake/cam or maybe swap to a carbbed 335stroker. How much would a 300hp 335stroker( carbbed) w/ good parts cost to build do you think?
12-03-2004, 04:00 AM
#19
Originally Posted by LOnSLO
Scrap the 305 rebuild. Just move up to a ZZ series crate motor or something. It would be about the same price anyway, and make way more power.
12-03-2004, 04:37 AM
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I run the GM_TBI Yahoo group. I'm strongly going to suggest to just buy a cheap 350-400 shortblock.
Personally, I'll be putting a big block in my TBI 305 caprice.
Personally, I'll be putting a big block in my TBI 305 caprice.