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  #16 (permalink)  
Old 01-31-2013, 11:39 AM
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350 build

It was run on a dyno and came back with 546 RWP. Not sure what the engine makes without drivetrain attached. It could possibly be making mid 600 at the crank, but never ran it out of the truck. We were aiming for 700 hp at the wheels but somehow fell short. We think its in the flow of the heads, but haven't addressed that issue...thought it was more important to get the traction issue resolved before adding additional power. LOL. I weigh in at 160, so that helps. LOL. Our initial goal was a low 9 second pass on a dual stage NOS of 150 and 250, But we're still a long way from that, especially with the traction issue. Have to take her to a full pro street rear end and fabricate some crossmember ties. Hoping to have that much done by spring, but moneys a bit tight.

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Old 01-31-2013, 11:42 AM
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350 build

Still trying to figure out why a 100 hp shot of NOS only netted a hp gain of 63 hp. We even tried a different plate and cleaning...with similar results. Any thought on that? Or is it just a bogus advertised number boosted up for sales?
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Old 01-31-2013, 11:44 AM
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350 build

Of course that was also measured at the rear wheels so I guess 100 hp at the crank is possible.
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Old 01-31-2013, 11:55 AM
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Got 166rwhp in my 95 acura integra with a 75 shot NOS to the 140hp 1.8L engine. Have not racked the bottle since 2000. You lose some in the drivetrain and size.
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Old 01-31-2013, 05:15 PM
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I built a 355 with similar intentions for my 81 El Camino. It has Summit Racing vortec heads, comp xe 276 with a speed demon 650. Runs amazing even though I have crappy hedman headers. As stated before, heads for g-body's are hard to find. The cam I used would most likely be a little to rough for you. I also have the RPM Performer intake. Forged rods and pistons with a thin head gasket gives me 9.8:1 compression. Good luck! Here's a video 81' El Camino 355 vortec - YouTube
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Old 01-31-2013, 06:53 PM
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if i go with the vortec assembled heads and xe262 i should not have to change anything on the heads Correct.

Thanks guys
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Old 01-31-2013, 06:59 PM
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The summit heads come assembled for flat tappet cams....all I did was get some Isky springs and set them to the correct height using the shims that came with the heads. While I had them apart I port matched them a little. Very easy as I have never done anything like this before! Then I got self aligning roller tip rockers. Couldn't be happier for the money. Also, summits vortec heads use standard length pushrods!
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Old 02-01-2013, 04:40 AM
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The vortec heads will require vortec rocker arms, vortec intake, and vortec valve covers. Not such a good deal after all that.

You should change the rear end ratio if you want more "power". 2.73's don't give the engine much mechanical advantage. Increasing the ratio to a 3.55 will feel like you installed a 454.

If you don't want to change the rear end then use a compcam 252H. Or a 255deh if you don't use headers.

Again, better to buy a complete 1996-2000 vortec 350 with a roller cam and vortec heads. You could get a complete engine (fan to flywheel) for 500 or 600 and drop it in as is. Much cheaper and quicker this way.
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Old 02-01-2013, 09:58 AM
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Put 4.10's in it. Now overdrive gear will actually be useful. (2.87:1 in OD)
Right now what you got is use less and not much fun.
The OD allows you to get very agressive on the gear ratio for hard acceleration.
No, 4.10's is not too much. Its just right for a El Camino with a high perf 350.

The "450" 305 heads are not the ones to use if doing the ported 305HO head on a 350 deal.
Lots of good ways to skin that cat but those aren't it.

TH-700R4 transmission Find your self a real deal high stall-lock up torque converter based on a smaller 245MM (9") converter core.
The ones made/modified from a stock 12" th700r4 converter size, are cheap but suck.
Big difference.

Last edited by F-BIRD'88; 02-01-2013 at 10:04 AM.
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Old 02-01-2013, 10:27 AM
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Just to toss it out there i appreciate all the advice.

I will be on the look out for some new gears and a limited slip.
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Old 02-01-2013, 10:46 AM
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Quote:
Originally Posted by El Rob View Post
Just to toss it out there i appreciate all the advice.

I will be on the look out for some new gears and a limited slip.
Limit slip..... avoid anything that is factory OEM stock . Even if its free.

Get a aftermarket Eaton Posi or a Auburn Posi for your Camino.
Either, works great.
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Old 02-01-2013, 10:48 AM
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Couldn't agree more about converter size. I cheaped out and get a 12" high stall and it built so much heat the trans cooked itself. I now have a PTC 3000 stall for after the rebuild is done. As far as buying a whole new engine...I got the vortec heads, vortec intake from amazon, and new rockers. I already had my block and wasn't about to REinvest in a new core for those simple reasons.
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  #28 (permalink)  
Old 04-17-2013, 07:49 PM
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help with cam pick. Howard roller retrofit. looking at http://www.summitracing.com/parts/hr...make/chevrolet. Summet vortec heads .520
Any advice.
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  #29 (permalink)  
Old 04-17-2013, 08:45 PM
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Quote:
Originally Posted by El Rob View Post
help with cam pick. Howard roller retrofit. looking at http://www.summitracing.com/parts/hr...make/chevrolet. Summet vortec heads .520
Any advice.
That cam should work great if your static compression ratio is somewhere between 8.75:1 and 10.00:1.
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Old 04-17-2013, 09:20 PM
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stock 12cc
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