355 TPI HP Estimate
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
355 TPI HP Estimate
What's up guys, I'm posting because I finally got a replacement for this beat up piece of s*** 305 that's in my 86 T/A, I've been looking for a 350 for about a year now and finally got one. Now im not trying make my car a racer or anything, just wanted to upgrade my 305 with something with a little more power. I have got my hands on a freshly rebuilt 350 and I was wondering could you guys give me a rough estimate of horsepower that I should be getting from my new motor. Ok here's the specs of the engine from the guy who rebuilt it. It's a 4 bolt main, It has #624 cly heads Bronze liners,milled 010 3 angle valve job 010 block,trw 4.030 pistons,hastings single moly rings,clevite bearings HV oil pump fel pro gaskets, Double roller timing chain,valves adjusted oil primed, and it has a 272/468 erson cam, and I plan on using the stock tpi intake that's on my 305(already have 350 knock sensor,22lb injecters, and 350 ecm ready for the swap) and its going to bolted up to my 700r4...... So could any one give me a rough estimate of h/p dat I should be getting with the specs that I provided (that's all I know about it, and that's the info dat was on the receipt that I was givin) sorry if I wrote anything down incorrectly I'm a engine novice.......
Also if I add some headers how much horsepower am I looking at??
So basically I wanna know could u guys give me a horsepower estimate without headers and with headers??
Also if I add some headers how much horsepower am I looking at??
So basically I wanna know could u guys give me a horsepower estimate without headers and with headers??
Last edited by dredre08; 11-14-2010 at 10:45 PM.
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Re: 355 TPI HP Estimate
Nothing you mention above changes performance except for cam and need more info on that
Heads are nothing special
http://www.chevelles.com/forums/show...91&postcount=4
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
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Re: 355 TPI HP Estimate
Vetteoz ,like I said I'm a engine novice, let me see if I can dig any more info on it but that's all I really know as of right now.... and not really looking for performance just something a little more powerful then that stock 305.
Last edited by dredre08; 11-14-2010 at 11:11 PM.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
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Re: 355 TPI HP Estimate
Vetteoz just read your link, Im almost crying in the inside... might be investing in some new heads later own down the road.
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Re: 355 TPI HP Estimate
Need to know duration @ 0.050 on cam; not advertised duration #
( 276 ) you posted
Should have a spec sheet from cam maker if new cam installed
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Ok I looked at cam specs, it says 224/224 as duration(not advertised) can't find anything on pistons as of yet
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Re: 355 TPI HP Estimate
What's up guys, I'm posting because I finally got a replacement for this beat up piece of s*** 305 that's in my 86 T/A, I've been looking for a 350 for about a year now and finally got one. Now im not trying make my car a racer or anything, just wanted to upgrade my 305 with something with a little more power. I have got my hands on a freshly rebuilt 350 and I was wondering could you guys give me a rough estimate of horsepower that I should be getting from my new motor. Ok here's the specs of the engine from the guy who rebuilt it. It's a 4 bolt main, It has #624 cly heads Bronze liners,milled 010 3 angle valve job 010 block,trw 4.030 pistons,hastings single moly rings,clevite bearings HV oil pump fel pro gaskets, Double roller timing chain,valves adjusted oil primed, and it has a 272/468 erson cam, and I plan on using the stock tpi intake that's on my 305(already have 350 knock sensor,22lb injecters, and 350 ecm ready for the swap) and its going to bolted up to my 700r4...... So could any one give me a rough estimate of h/p dat I should be getting with the specs that I provided (that's all I know about it, and that's the info dat was on the receipt that I was givin) sorry if I wrote anything down incorrectly I'm a engine novice.......
Also if I add some headers how much horsepower am I looking at??
So basically I wanna know could u guys give me a horsepower estimate without headers and with headers??
Also if I add some headers how much horsepower am I looking at??
So basically I wanna know could u guys give me a horsepower estimate without headers and with headers??
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Fast 355, So what do you suggest I do to improve this... what would be a good but not to expensive set of heads to replace these??
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
You basically have a 1985 Corvette L98 with a double roller chain and non computer friendly cam upgrade. 224 @ .050 is too much duration for a stock chipped, stock TPI runner, crappy flowing 624 head setup. I doubt it will have the power of your stock 305. The stock 85 L98 was something around 230 HP, put that in a F-car with a weaker computer program and more restrictive intake/exhaust piping and you will be down around 215-220 HP.
Fast 355, So what do you suggest I do to improve this... what would be a good but not to expensive set of heads to replace these??
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Re: 355 TPI HP Estimate
Whats the casting number on the heads on your 305? Some of them actually work quite well on a 350. If you have the #416 heads, like an original '86 should have, then those are a good choice for a 350.
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Re: 355 TPI HP Estimate
Vetteoz just read your link, Im almost crying in the inside... might be investing in some new heads later own down the road.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
You basically have a 1985 Corvette L98 with a double roller chain and non computer friendly cam upgrade. 224 @ .050 is too much duration for a stock chipped, stock TPI runner, crappy flowing 624 head setup. I doubt it will have the power of your stock 305. The stock 85 L98 was something around 230 HP, put that in a F-car with a weaker computer program and more restrictive intake/exhaust piping and you will be down around 215-220 HP.
See I told this guy I was only a 19 year engine novice and that I wasn't looking for a race car just something more powerful then my 305 something near 300 HP and I trusted this guy, and now it sounds like I got totally screwed..... so basically I'm nowhere near 300 h/p
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Do it. On a budget, try to find some regular iron L98 heads and just smooth out the ports alittle with a grinder. Smooth out the casting flaws. They can support a decent amount of power with alittle bit of work.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
http://www.jegs.com/i/GM%20Performan...0002/-1?CT=999
Last edited by dredre08; 11-15-2010 at 10:21 AM.
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Re: 355 TPI HP Estimate
Vortec heads need vortec TPI base. Stock runners/plenum will bolt to it but wont help power production since they will limit the air flow.
If its a flat top piston and 76cc head, then you would be at 9.1 to 1 compression. that aint bad for iron headed motor although you could probably go as high as 9.8-10.0 to 1 with that cam on good gas with good tuning.
If they flow as much as an Iron L98 head or close to it i can see you matching the power of an L98 and possibly exceeding it with the larger cam. Problem is cam may be too big for the intake system and give up alot of low end performance for little top end peak gain. Combined with a better TPI on top, it should pick up, but it needs a good tune.
It's a 4 bolt main, It has #624 cly heads Bronze liners,milled 010 3 angle valve job 010 block,trw 4.030 pistons,hastings single moly rings,clevite bearings HV oil pump fel pro gaskets, Double roller timing chain,valves adjusted oil primed, and it has a 272/468 erson cam, and I plan on using the stock tpi intake that's on my 305(already have 350 knock sensor,22lb injecters, and 350 ecm ready for the swap) and its going to bolted up to my 700r4..
If they flow as much as an Iron L98 head or close to it i can see you matching the power of an L98 and possibly exceeding it with the larger cam. Problem is cam may be too big for the intake system and give up alot of low end performance for little top end peak gain. Combined with a better TPI on top, it should pick up, but it needs a good tune.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
If its a flat top piston and 76cc head, then you would be at 9.1 to 1 compression. that aint bad for iron headed motor although you could probably go as high as 9.8-10.0 to 1 with that cam on good gas with good tuning.
If they flow as much as an Iron L98 head or close to it i can see you matching the power of an L98 and possibly exceeding it with the larger cam. Problem is cam may be too big for the intake system and give up alot of low end performance for little top end peak gain. Combined with a better TPI on top, it should pick up, but it needs a good tune.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
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Re: 355 TPI HP Estimate
Ok I found out what I have the head is 72 cc and its a flat top piston 4 valve relief.... now say I just get a whole new after market tpi system with these heads and piston and my cam wat could I expect
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Re: 355 TPI HP Estimate
I would hope with a tune it would be close to 325hp on motor or so. I mean a full bolt ons TPI car will dyno 250whp and run low low 13's in a 3450lb raceweight. A cam of that size should give it some more power although not all that much due to heads/intake rpm limitations. I would hope to see 275whp and possible high 12's but that may be abit optimistic. I know these cars respond well to 1.6 rockers on stock cams/stock heads, so abit more duration and lift with a tune should net 15whp IMO..atleast.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Well I was trying to keep that stock look but if I do that it. seems like ill just be in the same boat as I was with my 305 tpi and that we be like buying a motor for nothing.... so I guess I should go with the hsr plus it looks better and ill just store tpi away for a rainy day.....
so how much does a hsr cost, I seem to can't find a consistent price online..... and is dis a easy swap????l
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Do it. On a budget, try to find some regular iron L98 heads and just smooth out the ports alittle with a grinder. Smooth out the casting flaws. They can support a decent amount of power with alittle bit of work.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
And how much do they usually run because I can't seem to find one online
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Re: 355 TPI HP Estimate
New from Summit
http://www.summitracing.com/parts/WND-7540/
http://www.summitracing.com/parts/HLY-534-185/
+ some custom fuel lines and fittings for engine bay hookup
Always good ( better ) deals going in 3rd Gen parts
https://www.thirdgen.org/forums/engi...-ram-fast.html
I bought a bare HSR with fuel rails for $200 on there last month
A lot easier to work on than TPI intake
HSR swap how to and parts list
https://www.thirdgen.org/forums/alte...r-install.html
http://www.summitracing.com/parts/WND-7540/
http://www.summitracing.com/parts/HLY-534-185/
+ some custom fuel lines and fittings for engine bay hookup
Always good ( better ) deals going in 3rd Gen parts
https://www.thirdgen.org/forums/engi...-ram-fast.html
I bought a bare HSR with fuel rails for $200 on there last month
A lot easier to work on than TPI intake
HSR swap how to and parts list
https://www.thirdgen.org/forums/alte...r-install.html
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Ok I must say that I'm totally sold on the hsr..... I've done research on the hsr and it fits right in my budget , I also did research on my 624 heads and yea they are as crappy like all u say but that's all I got right now and plus the motor is completely assembled just waiting on a intake..... I have one last question, with the specs of my engine and adding the hsr what can I expect horsepower wise????
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
ok thanks for all your help guys, i deffiently am going to get this holley stealth ram, and all i need is the manifolds, throttle body, and fuel rails, and use my tpi wiring harness and all that right??? and do i use the 22lb injecters are will i need bigger because i was looking at the kit that comes with everything and it comes with 30lb injecters.
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Re: 355 TPI HP Estimate
22lb stockers will work fine unless they are clogged or leaking from being old. Stock TB will work fine, but it may hit the holley fuel rails...simple fix is to grind the bracket on the TB where it hits. You will know where when you install it all and see it. May not happen since you have an 86 TPI motor? Bracket/linkage was different on that year I believe compared to my 89 so you may not have a problem.
Some info on my swap.
https://www.thirdgen.org/forums/alte...ealth-ram.html
Some info on my swap.
https://www.thirdgen.org/forums/alte...ealth-ram.html
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Do it. On a budget, try to find some regular iron L98 heads and just smooth out the ports alittle with a grinder. Smooth out the casting flaws. They can support a decent amount of power with alittle bit of work.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
Even some of the 305 TPI based heads would give you some compression but the intake valve could be smaller so it will hurt flow alittle bit. A mild 350 may like the smaller valve however. A set of those can be found for free or up to 100-150 bucks. Do a clean up and replace valvesprings and you'll be ok for a mild build. Ported TPI or aftermarket TPI bolt ons will really wake it up with that sized cam. Tune it to match it should run ok.
Vortec heads are great bang for buck but you need vortec base to work with them. Thats another 450 bucks which is ridiculous if you ask me. You can go vortec HSR for almost 150 more and make tons more power...better suited to the cams rpm range.
So if I swap my crappy 624 heads for these vortec heads http://www.jegs.com/i/GM%20Performan...0002/-1?CT=999
Get the holly stealth ram vortec in combo with my cam (224/224 duration)
Flat top piston 4 valve relief
Throw some headers on
How close would I be to 300 h/p with this set up and what kinda of compression could I expect
Last edited by dredre08; 11-17-2010 at 10:51 AM.
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Re: 355 TPI HP Estimate
Can only be changed by changing cam (or using rockers with different ratio )
You stated above your cam has .468" lift so that is the lift you have now
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
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Re: 355 TPI HP Estimate
??
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Re: 355 TPI HP Estimate
You are fine. You just don't want to exceed the .475" lift. You are at .468" so you have a little wiggle room. When I put a cam in my Vortec 383HTE motor for my Tahoe I cheated a little and went with .480" lift. Working just fine with around 30,000 miles on it.
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Well thank everybody for there help...... just one last question could some one please give me a rough estimate of possible horsepower and compression with my future set up
Vortec heads (the ones in the link)
Flat top piston
Cam 224/224 duration
Holly stealth RAM intake
Headers
Vortec heads (the ones in the link)
Flat top piston
Cam 224/224 duration
Holly stealth RAM intake
Headers
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Hey guys kno this posting is kinda if old but with a set of 217 casting number heads be worth the time????
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
Engine: 305 TPI/350 TPI
Transmission: 700r4
Re: 355 TPI HP Estimate
Does anyone have a opinion on the 217 crate engine heads being used with my set up
#41
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Car: 1986 Trans Am/1988 Camaro Iroc-Z
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Re: 355 TPI HP Estimate
Any input on the 217 heads with my setup???? Please!!!! I need to know before I buy
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