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Post Info TOPIC: 1987 305 5.0 TPI T/A take out build .


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RE: 1987 305 5.0 TPI T/A take out build .


I have found 350 short blocks for $100.00 - $250.00 but they have cylinder wear and really need to be bored out . So for a budget and to just see how well I can get a small cubes SB Chevy to run I am happy to give this engine a try . By rights it will run better and MPG better then the 1983 non-Roller 305 that's in My Truck does . And that non-roller 305 runs well could be passed as a 350 by a test driver and MPG's better then the Factory 5.7 TBI did even in it's younger years after a good tune up . Sure 283'3 and 307's are good Engines too . But the bore to stroke on the 305 if fitted better for a street Engine build . I still would Like to build a 1979-80 267ci SB Chevy but just as a test to see how good a SB Chevy could really do on a gallon of gas . And I would run that Engine in My truck .

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how much more power do you think a roller cam can add to this engine ?
as i did some looking and the L69 and LB9 is the same motor except for the roller cam(same specs) and 4bbl carb vs TPI
but i am just wondering about the roller cam part as the intakes are different that could change power output as well.

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Remember the TPI 5.0 H.O has different heads and a Litlle more compression ratio . The 4bbl L69 305 H.O has #416 or #601 Heads but did have the Larger 1.84" intake valves and 1.50"ex valves 58cc Chambers . But the #081 TPI Heads have higher flowing intake ports . So that's going to make some extra H.P . The H.P gains per engine if the camshaft profile is the same should be only due to less friction of the roller valve train . And you can tell by the next to none timing chain wear this roller set up has much Less drag to it . But to go out and break the bank to build a mild street Engine that must be a roller because some Engine builder says so due to his fear of breaking in a Flat tappet camshaft . Na run the Flat tappet if that's the block you have . I was hoping this was a 5.0 roller out a 5sp manual car . They used a Larger camshaft then the 5.7 TPI did . If I was going for max power and doing a full rebuild I would up this Factory roller Camshaft to around 460-470" 220 dur .050 at 110 L/C . See most 305's that guys try and pump up start out with 8.6.1 C/R but you can port match the intake ports on the #416 or #601 heads and run some better springs make another 25 H.P before you change out the Camshaft .



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Here are the two Large 2bbls that I was giving a second Look at . The one is a rare Holley off a BB Mopar . It take's the same size air cleaner base as the 60's AFB 4bbl's . The other Carb is speced out for an early 70's Rocket 350 Old's . The G.M 2bbl has Larger throttle Plates but then bottle necks down at the top . The Holley 2bbl is much Larger in the Main body both carbs have the same base plate mounting pattern . Just something to Look at and kick around some .

 



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hey if you are going to use a 2 bbl carb i have a nice 1inch aluminum spacer with pcv port i can send your way.
but i would use a small 4bbl.(u can get better MPG's with a Q-jet if you keep off the back bbl's)

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I noted a few places I usually rework on the street cars. This will really help on the flow. It doesn't have to be much. Just take off any restricking edges. Remember air flows around edges. So if you have an edge sticjking out, it has to devert.



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I know on them spread bores you can get good MPG staying out of the back bbl's . It's just Guy's really don't think how unevenly they can also be a WOT . Then the cylinders are not all feed equally with Giant rear barrels and tiny front ones . The Holley Spread bores are made more evenly then the Q-Jets . I think the model I am thinking of is the #4175 or even the 6210 D/P Spread bore both 650 CFM Spread bore Carbs . Holley knows they are good Street carbs and prices them high . I have a 575 Carter AFB off a 327 340 H.P and a 600 Edelbrock Performer I could use . I have had a few Chevy's with 350's with that Large 2bbl set up when I bought them . They did get good Mileage in Mid size cars about 15.5 MPG in the city 20 on the highway with a good tune up . When I changed one to a G.M Van intake iron no EGR and used the 1977 Van Q-Jet as jetted with a rebuild . I can't say it was better on Gas . I think I Lost some MPG on that swap that's one that comes to mind because I drove that car far to work every day .

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Yeah Denny .W that Holley Big 2bbl is Cool . I remember a guy had a Late 60's 318 Dodge Dart that had a 318 with headers . It ran high 16's not bad I guess . Well them 318's had really small 2bbl's and intakes . He only installed one of these Large Holley 2bbls and Mopar intake that I think came off a 360 . With that change alone that Dart made some 14.90 passes . It worked good . I rebuilt one in the Late 80's for an old Guy that had a 400 Mopar . I would for sure rebuild this one and Look at doing the Mods you show . The Roundy Round Guys remove the Full Choke plate set up and hog out the main body to bring there CFM just over 500 . My Friend had one of them hogged out G.M big 2bbls on his 1970 stock Camaro 350 255 H.P it only had Headers and a recuved ign . It pulled nice out the hole and mid range .

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This Look's Like the carb Kit for that Holley 2bbl $18.99 .

 Walker Products - Carburetor Kit

Part # 15485H

15485h.jpg



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I always lay the gaskets on the carb, and make sure all the holes line up nice. If they don't, I trim them until they match correctly.



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Good info on double checking them gaskets . I also Like to use a torch tip cleaner to clean out passages in the carb body .

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Here is that HEI that was delivered today . I have to say it Looks to be made as good as an Accel maybe even a step up . And the clearances Look good .

 

 

 

 



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wow, that does look nice. smile  Way to go. Good price to boot.



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yeah its the price i can't get over!

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Still have not picked up an Intake manifold . I did get most of the gaskets that I need and a Fuel Pump . I am giving this intake manifold and carb a second Look . I might clean it up and run it . It's an Edelbrock S.P.2-P with a 600 VS Holley . In the 80's Super Chevy Magazine did a Econo Performer build and used this intake on a 350 in a 1970 Monte Carlo . It ran good I always thought that intake was to small for that build but it might be just right for this smaller 305 with the stock Roller camshaft .

 

 



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That should work well with the 305. I don't see any problems at all using that one. smile



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I will give it a good cleaning up . I ordered some new intake manifold bolts and a fuel mounting Plate and push rod . I will also need to elongate the 4 center intake bolt holes to work with the 1987 and newer bolt angle on the 305 Heads . It's a nice intake just has small runners .

21n2iza.jpg



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do you still have the intake you took off the 305 you now have in your truck ??
that would be a good intake .probley better then that small one.

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I Trashed it them Aluminum Q-Jet manifolds are restrictive and have that EGR Valve too . The early Iron Q-Jet intakes and some Van and Truck intakes with out the EGR are good . And you can modify them to out flow a standard Edelbrock Performer . I am not so much into Q-Jet's Like when I was younger . Then I had one on about everything I drove . So I still would end up modifying that Iron Q-Jet intake and run an adapter plate for a AFB Type carb . I am sure I could find a nice non-EGR Intake off a van in a Junkyard out here .

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Well today I had some time to give that intake a bath . Then cut the front grass . It was another hot day . I used the suns power to heat that intake as I was Cleaning it .

 



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that eddy intake looks good !
but going back to the chevy aluminum intake i read on some camaro sites that they flowed just as good as the performer intake?
i never checked it out myself.

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If you plan to use a G.M Q-Jet intake . Look for and Iron 1971 and Later Non-EGR Type found on most trucks . The 1969-70 manifold has a heat rise that cooks the under side of the Q-Jet . That Aluminum L69 Intake is the same somg Intake used on the big car's to the corvette's of the 80's . It's not going to out flow the Less restrictive Non-EGR Type Manifolds . Better to have the extra weight then the cast Aluminum Smog Intake .

 

e5odfr.jpg



-- Edited by TANGO on Saturday 4th of August 2012 11:21:08 PM

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