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Old 05-11-2004, 10:46 PM
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a few 350 questions?

I am swapping a chevy 350 into my 1987 toyota supra. there is a kit to bolt it to my stock r154 tranny. i plan to have to stock 350 rods and crank shot peened, im going to be using arp rod bolts, main studs, speed pro hyper pistons 030 over., all new bearings and gaskets. and the rotating assembly will be balanced. i would like to be able to run higher rpms. what would i have to do to my heads and at what rpm should i stop? also what would be a good cam? any info? thanks

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Old 05-11-2004, 10:51 PM
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How much moola you want to spend? I would recommend getting a set of Edelbrock RPM heads together with the RPM camshaft and lifters. This combo WORKS! And the price is not bad at all for what you get. A light car like the Supra will just fly!
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Old 05-11-2004, 10:53 PM
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well ill probly only have around 700 to spend on heads but i dont want the vortecs? i know thats not much but any advice?
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Old 05-11-2004, 10:58 PM
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supras are not lightweights. but it would still be really fast and very cool.
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Old 05-11-2004, 11:02 PM
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yeah i know weighs around 3400 but i plan to take a little weight off. however nothing is gonna put a big dent in that weight. id like to run low 13s but i dont wanna go with anything outrageous.
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Old 05-12-2004, 03:39 AM
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So you say you DON'T want to go with Vortecs? Any particular reason? Other than needing a vortec style intake.
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Old 05-12-2004, 06:41 PM
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well a guy that i talked to at work told me they were not necessary for the amount of hp i want to make and he siad that it is hard to find valve covers to fit them or something like that. i want around 400 hp without nitrous.
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Old 05-12-2004, 07:54 PM
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if i want to make 400 hp with a chevy 350 could i do it with a 700cfm carb?
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Old 05-12-2004, 08:49 PM
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hard to find valve covers ? there arent as many choices, this is true, but there out there+ Proform makes an adapter so you can put traditional parimeter bolt valve covers on the Vortec heads.
as far as the carb goes 700 cfm is enough to support nearly 7000 RPMs on a 350. If your using the Performer RPM cam, its good to roughly 6500 RPMs, I think youd be better off with a 650 cfm carb with an open spacer, or a 670 Holley. John
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Old 05-13-2004, 03:26 AM
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Well I'm gonna asume that a supra is FWD.So first I'd find the final drive ratio in high gear(not OD).Example:in a rear wheel drive car with the car in high gear(1:1ratio,not OD)your rear gears would be your final drive ratio(say 3.73s)
Anyway you'll need to know this to help select a cam.Have a cam Co. help you select one.
Gears aside I'd say build a 350 with flat top pistons,balanced with either Vortecs or a set of some kinna 2.02s with 64cc chambers,a high rise duel plane intake,1 5/8 headers and size the carb depending on what cam you end up with.
I'm assuming the tranny is a stick right?If not you'll be limited in cam size by the converter's stall rateing,unless you have a tranny shop stall it for you.
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Old 05-13-2004, 05:07 AM
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Well in my experience it takes a hell of alot of work( exstensive porting, larger valves, screw in studs,etc.) to make most stock chevy heads (except for L98's, vortecs, etc.) to flow enough to create 400 HP. They will get close, but you have to use a larger cam than you would with a set of vortecs or aftermarket heads. The larger cam would also put your peak HP above the 6000 RPM mark, which would increase wear and tear on the rest of your engine. If it were me I would save myself the time and aggravation of trying to build the stock heads and just get the vortecs with the bigger springs. Then you would know that you have the right heads for the job. They are great heads for the money and you can use a cam with about a 230*@.050 duration and make your 400HP at or a little below 6000 RPMs
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Old 05-13-2004, 07:43 PM
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nope supra is rwd and i dont know what size the rear end is? but thanks for the info guys i guess im either gonna go with vortecs or maybe some world heads

anyone know a good set of headers for this swap?

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Old 05-13-2004, 11:02 PM
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Never heard of that type of swap but you could probably get some help on your header question here http://www.supraforums.com/forum/index.php?
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Old 05-14-2004, 09:59 AM
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yeah right those guys think that the only motors that should be in supras are supra motors because they are jus the best motors in the world. trust me im a member of that site and took alot of crap for bringing this subject up there.
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Old 05-17-2004, 06:53 AM
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what about the rear end? can it take all of the power of a 350?
or r you putting a new one in?
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