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Author Topic:   434?
posted November 28, 2003 05:34 PM
OK, I might be dreamin'! I'd like to figure a way to build a big old stroker without breaking the bank. How would you go about building this kind of a motor on a budget?

posted November 28, 2003 06:14 PM
go to china buy all the parts, put them in a stock block with double humps, run it 50 laps and watch it blow up

rico 08
posted November 28, 2003 08:23 PM
Not easy to do on a budget,a 421 can be had for alot cheaper tho.I've heard of a 430 being built with a stock block but most use a dart block(there goes the budget).

posted November 28, 2003 09:47 PM
storm who advertises in all the magazines sells 434 pistons parts etc and cast piston shortblocks last I saw they were around 1900.

stock block

posted November 29, 2003 07:16 AM
So, a stock block can be used. You guys are gonna have to get me up to speed on the strokers. I thought the 421 was a stock bore 400 with a 4 inch stroke. Is it the 3 7/8 stroke? Why would that be more affordable to build?
Last night I found a roaoting assy. (434) using KB pistons. Does Speedpro make a piston for the strokers other than the 383?
I also read a post on 4m where Bill H. stated that a long stroke motor wouldn't be really desirable in a car with *" tires, due to the amount of torque vs. minimal traction.
Thanks for yur help guys.Oh, and, 2nd2none, obviously you missed my advertisement for a set of ruined 462 was titled "Chinese Junk" More of a satire than an ad. Had you read it you'd never have made the suggestion you did. But Thanks anyway. Way I got it figured that woulda been a cost of about $75 per lap.

posted November 29, 2003 08:30 AM
I remember that post.

and most everything has chinese stuff in it or on it. Its unavoidable these days. though I would like to support the usa.

I know that cast pistons were or are available, I dont think speed pro makes any.

a 421 is 3.875 4.155
a 434 is 4 4.155

I think with both youll be grinding into the pan rail enought that youll hit water. thats no biggie though, first time I ground my own stroker clearnace I hit the water jacket etc, and freaked. A machine shop sold me some marine stuff, that fills it right in. Ive used that stuff else where now and even tapped holes in it, its like cast iron when its dry.

I think you have to knock the pan around also.

the key would be to use stock appearing rods, they take less clearance than capscrew I beams or H beams..

I would call storm and talk to them, or midwest, Jr etc you know they all build them.

posted November 29, 2003 09:59 AM
i might be wrong, but i don't think you'll get 434 out of a stock block. the conrods will run into the camshaft. most of the aftermarket blocks have the camshaft mounted higher in the block for "stroker" clearance.
i'm pretty sure that 421 is about as big as you'll get in a stock block.
we built a 415 (stock block) for our late model and the rods are real close to the cam. had to grind the bottom of the cylinder walls and the pan rails (we actually set the block up on the mill and used a slot drill to machine the clearances). they are definitely a powerfull engine but i'm not sure that i would do it again. alot of work, 400 parts are more expensive (gaskets, pistons etc.) and they are a little harder to "hook up" BUT no doubt about it, they make serious power.
personally, i would build a 383 next time around.

posted November 29, 2003 10:51 AM
oops its speed o motive that sells 434 shortblocks.

626 869 0270

they are in california

posted November 29, 2003 01:08 PM
you can get more cam clearance by running a small base circle cam. also if you run capscrews you'll gain more there..but lose clearance on the pan rail. but you can grind the head of the capscrew to help that also.


posted November 30, 2003 06:49 PM
Whats breaking the bank.434 in a stock block isnt a big deal.If you run anything bigger than a 410 use displayed caps.I ran a 434 a couple of years ago.Real good contol engine.My engine builder sells a short block at a real good price.With 13/5 compression roller,stock Brodix track1 heads,Bowtie intake you will have around 600-630 hp and 550-580 tq.Call Scott at Sperry Engines 319-390-8636 you will be amazed how cheap you can build one for.

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