TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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Thats right, if you consider a pair of heads a bolt-on, which I do.
Stock #155 Peanut roller camshaft(4* Retard & 1.6:1 full roller rockers)
Stock port 059 Vortecs from a 2002 Express Van (back-cut valves), milled .025" (9.75:1 compression using 3.8" bore, 0.016" rubber embossed steel shim head gasket)
Edelbrock Performer Carb intake (milled to mate with milled heads)
2.00" 454 TBI unit w/ 80# injectors @ 12 psi
GM 454 TBI-Q-Jet manifold adapter
Hooker headers into single 3" exhaust
Custom Prom tuning
255 RWHP @ 4,900
310 RWTQ @ 3,200
The torque curve starts with nearly 285 RWTQ at just 2,000 rpm, obtains 300 ft/lbs @ 2,400 and doesn't fall below 285 ft/lbs to 4,600 rpm. That is about as flat as it gets. In normal driving it grunts hard from just off-idle all the way to 5,000 rpm. When the transmission shifts at 5,000 rpm the engine is still pulling and pulls hard immediately after the upshift.
BTW, this is the same engine that I already had in my 1991 G20 Van, save for the Peanut roller camshaft. I pulled the Crane 266H10 out of it as it was not the torquiest cam.
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(shown with cast-iron exhaust manifolds and a Holley Projection TBI adapter
Fast355, you just keep coming up with aces. nice numbers
i picked up a 87 SS last week with no motor or trans, so im going to be doing the TBI/350 Vortec/ 4L60E/ 427 budget build pretty soon, just waiting to get the title before i start in on it. i'll probably be having some questions for you as i build it.
i think im going to use a cam similar to the LT4 but with a little more lift, i want to keep a nice smooth idle.
Fast, how does it sound? Does it still sound "tinny" with the stock cam? That was my biggest complaint when I had nearly every bolt on still running the stock cam.
Fast...I don't know how you do it...but I wish I did!!! I personally think you can make an engine that fits any car...truck...or van!!!!
I have that same cam in my Caprice...obviously I hate it...with stock 193's...its such a dog when compared to other 350 cam's....I did as many bolt on's as I could and that was just barely enough to wake it up...
I swear you build an engine every other week just because you can, not because you need it. Those are pretty good numbers for a 305. Was a can of paint not in the budget or do you just like rusty thermostat housings?
thats amazing that you got them kinda numbers out of that tiny *** camshaft. I figure no matter how much heads you threw at it you'd be lucky with 225 wheel horsepower quite. Once again you've proven the common nomenclature incorrect awesome tuning fast. nice work.
thats amazing that you got them kinda numbers out of that tiny *** camshaft. I figure no matter how much heads you threw at it you'd be lucky with 225 wheel horsepower quite. Once again you've proven the common nomenclature incorrect awesome tuning fast. nice work.
Well just like John Lingenfelter said: "The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power."
Just goes to show how good the 059 Vortec 305 heads actually are, even though everyone bashes them because of the 1.84 intake.
Does anybody know the GM part number for the 059 heads?
I have seen like 4 different castings of SBC vortec heads on ebay used. I don't know the differece between them, except that the 059's were for a 305.
However, looking at Summit and Jegs, I can only find ONE vortec new. That same set is on GMpartsdirect for like $10 more. If I could figure out the GM part numbers, I bet all the Vortec heads would be available new on GMPD.
__________________ -Adam
1990 Firebird Formula
Bone Stock 305TBI, T5 tranny, 62k Origional
UMI subframe Connectors
Does anybody know the GM part number for the 059 heads?
I have seen like 4 different castings of SBC vortec heads on ebay used. I don't know the differece between them, except that the 059's were for a 305.
However, looking at Summit and Jegs, I can only find ONE vortec new. That same set is on GMpartsdirect for like $10 more. If I could figure out the GM part numbers, I bet all the Vortec heads would be available new on GMPD.
I would look at EngineQuest CH305A heads, they are new, improved castings of the 059s.
They have a 58cc chamber and run 1.84/1.50" valves, with the same ports as the EQ 350 vortec heads which flow better than the stock Vortecs. They also have more material where it matters for porting.
I would look at EngineQuest CH305A heads, they are new, improved castings of the 059s.
They have a 58cc chamber and run 1.84/1.50" valves, with the same ports as the EQ 350 vortec heads which flow better than the stock Vortecs. They also have more material where it matters for porting.
Do they need to be milled down or should they be bolted just as they are? What head gasket would you recomend in combination to have the best compression?
Did u tune it using the stock ECM?
I have already installed a lt1 cam, is it possible hp - rpm range, will be to high for a streat lo3?
Sorry for all the questions but I would really like to find a stock looking combination for my lo3, that makes excellent power below 4500 rpm that doesent require machine work.
Me too, I am looking for a good daily driver LO3 top end, that I can paint black, and it will make good power, but at first apparance it will look like a completely stock motor. People wont know what hit them!
Those EngineQuest heads look nice, and I do believe the whole point of getting a 305 head is it comes with a smaller chamber, like 58cc, so that you shouldnt have to mill it down. I would just be hesitant to spend that much on heads that didnt even come with valves or anything.
The other problem, is, dont you need to modify the vortec heads to take the lift from the LT1 cam?
oh there is plenty more mild camshafts than the lt1 cam but, true it is tiny in my estimation. just under .450 lift at rockers. with insanely low durations.
anything over .460 lift at rockers i would be weary of. Some can get by with over
.480 but, you need to check it for clearence 4 sure.
anyways i'm going to be running a crane 2032 in my 305, it's just .452/.465 lift with 1.5s but, i'll be using 1.6s so i'm going to use .050 locks, and .050 spring shims just in case so i dont have to worry about it, know what i mean?
oh there is plenty more mild camshafts than the lt1 cam but, true it is tiny in my estimation. just under .450 lift at rockers. with insanely low durations.
anything over .460 lift at rockers i would be weary of. Some can get by with over
.480 but, you need to check it for clearence 4 sure.
Does this mean that an LT1 cam sould be fine paired with a set of vortec heads, with the factory springs and rockers on the vortecs?
Quote:
Originally Posted by flaming-ford
anyways i'm going to be running a crane 2032 in my 305, it's just .452/.465 lift with 1.5s but, i'll be using 1.6s so i'm going to use .050 locks, and .050 spring shims just in case so i dont have to worry about it, know what i mean?
something to be said for peice of mind for sure.
Ive never actually worked on a set of heads, so you are a little over my head there (no pun intended). I dont know what locks and shims are. I looked that cam up on summit, looks like a great choice for a mild top end. However, it costs and arm and a leg. From what I read, keeping a low LSA is the key to being able to tune the computer for the camshaft.
The other thing I was wondering about though, is maybe something off-brand like a Summit Racing cam or something. They have those things real cheep, and I am sure they have some milder ones like the LT1 or something, right?
__________________ -Adam
1990 Firebird Formula
Bone Stock 305TBI, T5 tranny, 62k Origional
UMI subframe Connectors
Does this mean that an LT1 cam sould be fine paired with a set of vortec heads, with the factory springs and rockers on the vortecs?
yes sir, as long as you are using a 1.5 ratio rocker arm it will be fine. (1.5 ratio is factory on all sbc's that i know of unless were talking aftermarket).
Ive never actually worked on a set of heads, so you are a little over my head there (no pun intended). I dont know what locks and shims are. I looked that cam up on summit, looks like a great choice for a mild top end. However, it costs and arm and a leg. From what I read, keeping a low LSA is the key to being able to tune the computer for the camshaft.
this is much more simple than it sounds. on a set of heads you of course have your springs set in first in the factory spring perches next to the rocker studs right? (thats the bowl like cut out in the head casting). Above that you have a retainer, which is a round disk shaped washer that sits over top of the spring (think of it as a spring hat). Then of course you have is called a valve lock. It does just what the name implys. A valve lock is wierd shaped tiny little peice of metal that fits in a groove cut at the top of the valve. when assembling you compress your spring with a spring compressor that fits over top of the spring hat (retainer), then you use the tiny little machined locks and put them in the groove found on the top of the valve while slowly uncompressing the spring until the spring pressure exerted is enough to get the machined locks stuck in place. It's as easy as that.
The other thing I was wondering about though, is maybe something off-brand like a Summit Racing cam or something. They have those things real cheep, and I am sure they have some milder ones like the LT1 or something, right?
of course you can get a cam design for pretty much any performance goal in mind. The most popular cams are used for a reason the lt1 cam can be had for 50$ or less all the time. The lt4 hot cam can be had cheap and it's fairly beastly for a mostly stock engine. The lt4 production camshaft is quite like the above lt1 camshaft but, is usually a little pricier as it is a bit rarer to find.
i'll have a lb9 5 speed camshaft for sale come spring time if interested (i'll let you have it for 25 bux if u want it).
if you want something a bit bigger than that pm me i can help you decide on what fits your application best.
Well, when I finally decide to go ahead with my project, I will keep that in mind. I think tho, if I am gonna do all the work to tear off the heads, and replace all this different stuff, and do a cam swap, I might as well get some beefy parts.
same power i made with my HSR bolt on L98. 254 at 5100 and 315 at 3200 or so. I ran 12.95 with that setup. Thats good for that peanut cam, those heads really helped.
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