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Old 05-11-2009, 07:21 AM
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Advise for stroking a 350-4-bolt main to a 383

Hi Guys,
Iv'e been reading alot of post on some other threads about getting 500+ hp out of a 350. I'm really wanting to get 500+ hp out of my 350 and before i stroke it. I want to get advise from the pro's cause im not rich so i dont want to spend money un-wisely.. So, here is what i have and what i have in mind to do...

Currently i have a 350 4-bolt main Gen-I engine 85' two-piece seal. I got the Edelbrock performer rpm top-end kit. 750cfm edelbrock carb. and a set of headers i dont have a clue who makes them. my dad gave them to me from his play days. I have hyd. flat tappet rockers and a dbl. roller timing chain

This is what i have in mind of doing... Forged balanced 383-stroker kit .30 over and since reading here porting the heads.roller rockers and a semi to noisy timing gear set (how do you guys feel about the timing gear set)

Thats what im needing guidance on.. So please point me into the right direction. Thanks Darrell

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Old 05-11-2009, 07:34 AM
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forgot to say what im doing with this powerhouse. lol

What i will be doing with this app. is street strip... a daily driver but hey... their are plenty of gas stations. lol and should i go to a tbi???
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Old 05-11-2009, 08:42 AM
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Quote:
Originally Posted by wild_man84
What i will be doing with this app. is street strip... a daily driver but hey... their are plenty of gas stations. lol and should i go to a tbi???

I would not suggest the tbi, they arnt that great for making power. Granted some people have done it, but i would stick with the carb. You can make good power and still have decent mpg. Again i know they make aftermarket tbi kits....but most are $$ just my 2 cents.
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Old 05-11-2009, 11:15 AM
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Hi,
I would use the chain, when you use gears everything going on with the crank (harmonics & stuff) is transferred to the valve train,
this is lessened with a chain & is further reduced buy using a belt drive, only they are cost prohibitive.
Rich
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Old 05-11-2009, 12:41 PM
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thanks for the reply guys.... iv'e been around it for a while but its now my turn to learn from experience. lol but with this great website im sure i can get it right the first time.. i have a nice looking engine when it gets finished i would love to show you guys to get your input.. i will help as much as i can but i wont post a reply unless i know for sure. wouldnt want to send someone off on a spin. so is what i have good enough for 500+ hp on pump gas...
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Old 05-11-2009, 12:44 PM
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Quote:
Originally Posted by wild_man84
thanks for the reply guys.... iv'e been around it for a while but its now my turn to learn from experience. lol but with this great website im sure i can get it right the first time.. i have a nice looking engine when it gets finished i would love to show you guys to get your input.. i will help as much as i can but i wont post a reply unless i know for sure. wouldnt want to send someone off on a spin. so is what i have good enough for 500+ hp on pump gas...

Does that top end kit come with a cam...if so what are the specs?
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Old 05-11-2009, 01:11 PM
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I think edelbrock dyno'd their RPM top end kit at 425hp (around there). so I would think your engine would be short of 500hp. But that could be fixed with a little 100hp shot of N02.

It would be easier to make 500hp is with a bigger engine. 383 is a step in the right direction, 406cid would be even better. For example: say your 350 makes 425hp with the top end kit, then that same kit on a 406 should make 490hp. This assumes the heads flow at least 245 cfm at the max lift of the cam.
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Old 05-11-2009, 01:17 PM
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edelbrock says 410hp with the top end kit (non-roller rpm) on a 350.
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Old 05-11-2009, 01:17 PM
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Quote:
Originally Posted by wild_man84
Hi Guys,
Iv'e been reading alot of post on some other threads about getting 500+ hp out of a 350. I'm really wanting to get 500+ hp out of my 350 and before i stroke it. I want to get advise from the pro's cause im not rich so i dont want to spend money un-wisely.. So, here is what i have and what i have in mind to do...

Currently i have a 350 4-bolt main Gen-I engine 85' two-piece seal. I got the Edelbrock performer rpm top-end kit. 750cfm edelbrock carb. and a set of headers i dont have a clue who makes them. my dad gave them to me from his play days. I have hyd. flat tappet rockers and a dbl. roller timing chain

This is what i have in mind of doing... Forged balanced 383-stroker kit .30 over and since reading here porting the heads.roller rockers and a semi to noisy timing gear set (how do you guys feel about the timing gear set)

Thats what im needing guidance on.. So please point me into the right direction. Thanks Darrell
It would be a good thing to consider ALL aspects of this build for 500+ ponies, the more you push the limit the more attention to detail is required. Without knowing anything else I would say that a 750 cfm carb is going to fall short of your goal.
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Old 05-11-2009, 01:31 PM
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Sorry about the spec's guys. here is what i know

Heads..
combustion chamber 64cc
intake runner 170cc
exhaust runner 65cc
valves 2.02/1.60
max valve lift .575
outside spring dia. 1.460
exhaust pot shape square

Cam...
hyd. flat tappet 1,500-6,500 rpm range
Basic Operating RPM Range: 1,500-6,500
Intake Duration at 050 inch Lift: 234
Exhaust Duration at 050 inch Lift: 244
Duration at 050 inch Lift: 234 int./244 exh.
Advertised Intake Duration: 308
Advertised Exhaust Duration: 318
Advertised Duration: 308 int./318 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.488 int./0.510 exh. lift
Lobe Separation (degrees): 112

thats my cam and heads pt# heads-edl-60999/cam is edl-7102

saying that what kind of fire do i need to lite this candle with.. blue streak? msd? mallory?
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Old 05-11-2009, 01:37 PM
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where to find the cfm of the heads

I dont know the answer to the question about what those heads flow at. right now they are the factory edelbrock heads. (with no port-n-polish) how can i find this info out... and how much does port-n-polish add to the cfm

thanks guys
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Old 05-11-2009, 01:44 PM
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here are some flow numbers.

http://www.purplesagetradingpost.com...fo/heads1.html

those RPM heads are limited to 465hp. so be happy with less hp on get another set of heads.
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Old 05-11-2009, 01:58 PM
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Quote:
Originally Posted by 454C10
here are some flow numbers.

http://www.purplesagetradingpost.com...fo/heads1.html

those RPM heads are limited to 465hp. so be happy with less hp on get another set of heads.
I would agree here, so far 450hp is more attainable.
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Old 05-11-2009, 03:01 PM
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I was reading another thread. and someone said that since he was going from a 350 to a 383 he would have to up the cam. i was just reading edelbrocks page and its saying not to go over the lift unless you change the springs. i am assuming its referring to its max lift. i want that big cam sound but i dont want a bark with no bite.
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Old 05-11-2009, 04:28 PM
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Go with a solid lifter cam and you might get your 500 goal. Hydraulic cams are for gurls! You need to get up over .550" lift to get the power you are looking for, but it could be done with those heads and a rippin' solid cam.
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