Stroked 402? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hardesty454 · 04-04-2013, 04:25 PM

Hey y'all. I have a 71 402 mildly stock. Has an edelbrock rpm intake and edelbrock 1407 750cfm carb right now. Also long tube headers. Was wondering how would I stroke this mofo. Is there any real benefit for a 402?
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GCncsuHD · 04-04-2013, 04:30 PM

A 454 crank will put it 436ish IIRC, as far as benefit, I guess it depends on what you want from it stump pulling torque, or a higher RPM screamer. Of course this also depends on many other variables.

Hardesty454 · 04-04-2013, 04:32 PM

Besides the crank, what would need to be changed?
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67_C-30 · 04-04-2013, 09:13 PM

Quote:

Originally Posted by Hardesty454

Besides the crank, what would need to be changed?
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Pistons. Here is a 461 cu in 396 stroker build. Speed O motive used to offer a 434 cu in 396 stroker, but I don't know if they are still open.

http://www.carcraft.com/techarticles...d/viewall.html

turp mcspray · 04-04-2013, 09:22 PM

Since you already have the 402, I would do a cam upgrade, dial in the ignition, and call it a day. If you are going so far as to stroke it, I would find a 454 block and stroke it, instead. Now you will have 489/496 cubes, and there is no substitute for cubic inches!

SS Tim · 04-04-2013, 09:27 PM

If you are going to do anything just start with a 427/454 block and build from there. A stroker is going to need crank, pistons, rings, bearings and a camshaft anyway.

GASoline71 · 04-06-2013, 06:38 PM

Quote:

Originally Posted by turp mcspray

Since you already have the 402, I would do a cam upgrade, dial in the ignition, and call it a day. If you are going so far as to stroke it, I would find a 454 block and stroke it, instead. Now you will have 489/496 cubes, and there is no substitute for cubic inches!

Quote:

Originally Posted by SS Tim

If you are going to do anything just start with a 427/454 block and build from there. A stroker is going to need crank, pistons, rings, bearings and a camshaft anyway.

^^^ This.

Gary

**jocko** · 04-04-2013, 09:31 PM

concur - save the 402s!!! You might be surprised how much you'll like the 402 if you just add a cam/intake/carb. I like em stock but I understand the need for speed. Taint cheap though.

**yote1234** · 04-06-2013, 05:06 PM

Quote:

Originally Posted by jocko

concur - save the 402s!!! You might be surprised how much you'll like the 402 if you just add a cam/intake/carb. I like em stock but I understand the need for speed. Taint cheap though.

true.. my 402 screams! but then again i get excited easly! hehehe

Hardesty454 · 04-04-2013, 10:09 PM

I appreciate every input from y'all. I'm wanting to just do a fresh rebuild but add a little beef. Someone mentioned stroking it would be cool an I concurred. However, adding a cam to the existing setup will save me a lot of headache. If I were to add a cam to a stock setup (except the intake and carb I have) what cam would be recommended? While changing cam, what do you feel about changing lifters way same time. Stroke?
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**70CHEVYBB** · 04-04-2013, 11:39 PM

The fastest car I ever owend was a 396 in a chevelle turbo 350 with a vega stall converter and 373 gears. I raced alot and never lost once. I do have to say that I did build a 468 for the truck I am building now. I would keep the 402 add a forged crank 10to 1 big cam stainless valves and have some fun

04-04-2013, 04:25 PM	#1
Hardesty454 Registered User Join Date: Feb 2011 Location: Riverbank, Ca Posts: 1,006	Stroked 402? Hey y'all. I have a 71 402 mildly stock. Has an edelbrock rpm intake and edelbrock 1407 750cfm carb right now. Also long tube headers. Was wondering how would I stroke this mofo. Is there any real benefit for a 402? Posted via Mobile Device __________________ Rob 1971 c10 - ground up in progress Tripp's Speed Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=589750

04-04-2013, 04:30 PM	#2
GCncsuHD Charlie Daniels w/ a Tq Wrench Join Date: May 2009 Location: Statesville, NC Posts: 1,570	Re: Stroked 402? A 454 crank will put it 436ish IIRC, as far as benefit, I guess it depends on what you want from it stump pulling torque, or a higher RPM screamer. Of course this also depends on many other variables. __________________ ΜΟΛΩΝ ΛΑΒΕ 67 C10 Shortbed "Great Grandpa's Truck" I6 3 on the Tree 71k original miles 5.3 swap in the works 69 K5 Blazer-Family Beach Cruiser Project 78 K30 Dually Semi-Retired Fire Truck 350/SM465 35"s SOLD01 2500HD ECSB 6.0 4x4 5.13's 8" lift 38"s

04-04-2013, 04:32 PM	#3
Hardesty454 Registered User Join Date: Feb 2011 Location: Riverbank, Ca Posts: 1,006	Re: Stroked 402? Besides the crank, what would need to be changed? Posted via Mobile Device __________________ Rob 1971 c10 - ground up in progress Tripp's Speed Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=589750

04-04-2013, 09:22 PM	#5
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: Stroked 402? Since you already have the 402, I would do a cam upgrade, dial in the ignition, and call it a day. If you are going so far as to stroke it, I would find a 454 block and stroke it, instead. Now you will have 489/496 cubes, and there is no substitute for cubic inches! __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

04-04-2013, 09:27 PM	#6
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Stroked 402? If you are going to do anything just start with a 427/454 block and build from there. A stroker is going to need crank, pistons, rings, bearings and a camshaft anyway. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

04-04-2013, 09:31 PM	#8
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,954	Re: Stroked 402? concur - save the 402s!!! You might be surprised how much you'll like the 402 if you just add a cam/intake/carb. I like em stock but I understand the need for speed. Taint cheap though.

04-04-2013, 10:09 PM	#10
Hardesty454 Registered User Join Date: Feb 2011 Location: Riverbank, Ca Posts: 1,006	Re: Stroked 402? I appreciate every input from y'all. I'm wanting to just do a fresh rebuild but add a little beef. Someone mentioned stroking it would be cool an I concurred. However, adding a cam to the existing setup will save me a lot of headache. If I were to add a cam to a stock setup (except the intake and carb I have) what cam would be recommended? While changing cam, what do you feel about changing lifters way same time. Stroke? Posted via Mobile Device __________________ Rob 1971 c10 - ground up in progress Tripp's Speed Shop Build - http://67-72chevytrucks.com/vboard/s...d.php?t=589750

04-04-2013, 11:39 PM	#11
70CHEVYBB Senior Member Join Date: Feb 2012 Location: chillicothe, illinois Posts: 688	Re: Stroked 402? The fastest car I ever owend was a 396 in a chevelle turbo 350 with a vega stall converter and 373 gears. I raced alot and never lost once. I do have to say that I did build a 468 for the truck I am building now. I would keep the 402 add a forged crank 10to 1 big cam stainless valves and have some fun



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