Vortec Roller Motor.

[racer1182]

My machinist gave me a early 90s 350 block that has everything for the roller cam setup so I think I\'m gonna build a good roller motor for the S10. I\'m hopin to get atleast 425 horse out of it but we will see what the budget allows. It will have swirl port heads and maybe a port and polish job with a air gap intake. Flat top pistons, also can you use 6in rods work in a 350? Might be able to get a good deal on a set. ANy help on parts that will help me achieve my hp goal would be greatly appreciated.



Greg

[Ryoung68]

You can use 6\" rods on a 350 but you will need new pistons with the raised pin location to keep the piston below the deck. http://www.s10v8.com/images/smilies/icon_razz.gif

[racer1182]

sweet thats what I needed to know.....6 inch rods are better anyway aren\'t they?

[Scotty_S-15]

I doubt if you\'d ever see a difference on a 350. GM would have used them if there was any advantage. http://www.s10v8.com/images/smilies/icon_wink.gif

[rudedogg]

there is a difference with a 6\"rod it makes more tq http://www.s10v8.com/images/smilies/icon_wink.gif

[Scotty_S-15]

On 2006-02-21 14:14, rudedogg wrote:

there is a difference with a 6\"rod it makes more tq http://www.s10v8.com/images/smilies/icon_wink.gif



How much more Torque? http://www.s10v8.com/images/smilies/icon_confused.gif I doubt if it would even be noticable on a dyno, much less in a vehicle. http://www.s10v8.com/images/smilies/icon_wink.gif



But that isn\'t to say you can\'t find a magazine article claiming huge gains.... http://www.s10v8.com/images/smilies/icon_razz.gif

[360SS-10]

425 horses out of a roller 350 won\'t be difficult to acheive, just pay a little attention to the bottom end before going nuts. One trick I was really impressed with was the number 4 and 7 cylinder swap, runs smoother and a little cooler believe it or not.

[riotpolice75]

id go with the swap cam. the problem with the stock cam is the firing order 1-8-4-3-6-5-7-2. with your standard wet manifold 5 hits the intake stroke and takes all the fuel away from 7 causing 7 to go lean. is it a 2 or 4 bolt block? have you puyt any thought into a rotating assembly or a compression ratio or heads, etc?







smith

[riotpolice75]

most importantly...do you have a budget?







smith

[racer1182]

yeah my engine builder cuts me a few deals and lately he has been given alot of deals. He has a set o swirl port heads that I\'m gonna redo with a mild prot and polish job and good valve springs. I haven\'t torn the bottom end apart yet but hopin to do that soon. will let you guys know soime casting numbers this weekend



Greg

[Marutek]

I saw this on swirl port heads <a href="http://www.sallee-chevrolet.com/Cylinder_Heads/350truckSPH.html" target="_blank" target="_new">http://www.sallee-chevrolet.com/Cylinder_Heads/350truckSPH.html</a>

I was going to use a set also till i looked in the port. I decided on a set of l31 vortec heads.

[racer1182]

he says they are swirl port but I\'m gonna look at the casting numbers when I go up to his shop

[riotpolice75]

youll have a hard time making 425 horse with swirl port heads man. go with the vortec heads. get pistons with between a 10 and 15CC dish and run them at a 0 deck clearance. then get head gaskets with about a .020 compressed thickness. that means your total quench is .020. that will all but eliminate detonation. a 15cc piston will put you at about 9.5 - 9.6:1 a 10cc piston will put you at about 10 - 10.1:1. well within pump gas territory. problem with the stock vortecs is you cant run above .470 lift with the stock studs and springs. so keep your eye out for a set thats drilled for screw in studs.







smith

[blue82s10]

Is it a carb set up?I am building late model hydraulic roller motor now.I am using a 510-533 232-236 cam.They say this is the best i can do with the factory roller lifters.I am using a good set of ported heads for this.I was told that i need better than a vortec head for this.Keep me posted on how your buildup goes.I am buying a 8.5 rear soon so i can put one of my motors in this truck.

[racer1182]

my engine builder is helping me with alot of the spec part of it but I\'m gonna keep my 7.5 rear til a shatter it..........been there for 2 1/2 years now and still going strong. I\'ll keep you guys updated.



Greg

[racer1182]

Well I got the block torn apart and it is actually in good shape considering is been sitting outside for a few years. I\'m gonna go ahead and go with the 4-7 swap cam. I\'ll keep you guys posted on progress



Greg

[rayL]

http://www.grapeaperacing.com/GrapeApeRacing/tech/connectingrods.pdf





this is a good link with information on the rod lengths and what the pros and cons of each are. Just go with whatever your engine builder recommends and you will be happy. Im with scotty, at 425hp i doubt you will NOTICE any hp or torque gains from the 6\" rod. The main advantages are longevity.

[coppergmc]

I agree with Scotty_S-15 on the rod length. You will not feel any difference in any way. Save your money for a better set of heads. Besides, to make 425hp, you will need a little extra cash for a converter. 425hp doesn\'t come without spinning the motor some so you better upgrade your bolts. I\'d at least run a hyper piston with moly rings. Skip the H bearings and exotic pieces. The vortec heads with a roller cam like the one from edelbrock with a matching air gap intake should put you close to where you want to be. If you have a little more money buy a set of Canfield 197 heads. They work great. Copper