stroker with standard bore???

jruppert · 11-26-2002, 09:18 PM

I have a question.. Is it possible to build a stroker using the standard bore size? The reason why I ask is because of the price it costs to get an engine bored and seasoned for building. Can I take a new block and use the stroker crank and instead of building a 347 you would have a 342? I know this may sound weird but I'm just looking at my options. Thanks

Coupe50h · 11-26-2002, 09:59 PM

That is correct, 342, i believe people do it all the time, a standard bore 331 would be 327 if im not mistaken.

id rather have standard bore also for the lighter pistons, usually a block undergoing a stroker kit needs fresh bores, unless it's a brand new block.

302 LX Eric · 11-27-2002, 08:54 AM

That's right. You can put a 3.25" stroke crank with stock 4.000 bore and get a 327 cu. in.

3.25 x 2^2 x Pi x 8 = 326.725636 or 327 cu. in.

The nice thing about boring to say .030" over is that you get a 'brand new hole' with a nice cross-hatch that promotes good sealing of the rings. Plus, you're probably going to be putting a new set of lightweight aluminum pistons in anyways. The only real 'drawback' would be that your thinning the clyinder walls. But, .030" is more than safe on a stock 302 block.

E

WADS56 · 11-27-2002, 08:59 AM

Also when using a big intake valve the .030 will help unshroud it. Then you will get the 5 extra cubes + better flowing intake charge.

bigred90gt · 11-27-2002, 10:58 AM

With a stroker, can you just change the crank, or do you have to change the rods and pistons to keep from putting the pistons through the heads? It's a dumb question, but I really have no idea.

Caymon

sn95gt19 · 11-27-2002, 11:22 AM

yeah you have to change to the longer rod, and crank, and pistons cause the pin bore in the piston has to be moved up to compensate for the longer throw of the crank and rods.

jruppert · 11-28-2002, 12:29 PM

At the moment I am looking at all my options. I can spend $500 on getting this block prepared or spend $400 on a new one. That is why I am curious.

11-26-2002, 09:18 PM	#1
jruppert Registered Member Join Date: Jul 2001 Location: Reed City Mi Posts: 106	stroker with standard bore??? I have a question.. Is it possible to build a stroker using the standard bore size? The reason why I ask is because of the price it costs to get an engine bored and seasoned for building. Can I take a new block and use the stroker crank and instead of building a 347 you would have a 342? I know this may sound weird but I'm just looking at my options. Thanks __________________ '94 GT, 347 stroker, AFR 185's, Trick Flow stage 2 Cam, Edelbrock upper and lower, 70mm Tbody, 77mm MAF, 24lb injectors, 255 lph pump, underdrive pulleys, 1 5/8 Motorsport Headers, king cobra clutch, tremec tko, 3.73 gears, flowmasters

11-26-2002, 09:59 PM	#2
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	That is correct, 342, i believe people do it all the time, a standard bore 331 would be 327 if im not mistaken. id rather have standard bore also for the lighter pistons, usually a block undergoing a stroker kit needs fresh bores, unless it's a brand new block. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-27-2002, 08:54 AM	#3
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	That's right. You can put a 3.25" stroke crank with stock 4.000 bore and get a 327 cu. in. 3.25 x 2^2 x Pi x 8 = 326.725636 or 327 cu. in. The nice thing about boring to say .030" over is that you get a 'brand new hole' with a nice cross-hatch that promotes good sealing of the rings. Plus, you're probably going to be putting a new set of lightweight aluminum pistons in anyways. The only real 'drawback' would be that your thinning the clyinder walls. But, .030" is more than safe on a stock 302 block. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

11-27-2002, 08:59 AM	#4
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	Also when using a big intake valve the .030 will help unshroud it. Then you will get the 5 extra cubes + better flowing intake charge. __________________ 79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor 93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe Ricer hater's club member #49

11-27-2002, 10:58 AM	#5
bigred90gt 2 Stangs in the Stable Join Date: Apr 2002 Location: Baytown, TX Posts: 1,209	With a stroker, can you just change the crank, or do you have to change the rods and pistons to keep from putting the pistons through the heads? It's a dumb question, but I really have no idea. Caymon __________________ '90 GT Under construction Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!! 04 F-150 STX 4.2L 5 spd Rice Haters Club Member #128

11-27-2002, 11:22 AM	#6
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	yeah you have to change to the longer rod, and crank, and pistons cause the pin bore in the piston has to be moved up to compensate for the longer throw of the crank and rods. __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

11-28-2002, 12:29 PM	#7
jruppert Registered Member Join Date: Jul 2001 Location: Reed City Mi Posts: 106	At the moment I am looking at all my options. I can spend $500 on getting this block prepared or spend $400 on a new one. That is why I am curious. __________________ '94 GT, 347 stroker, AFR 185's, Trick Flow stage 2 Cam, Edelbrock upper and lower, 70mm Tbody, 77mm MAF, 24lb injectors, 255 lph pump, underdrive pulleys, 1 5/8 Motorsport Headers, king cobra clutch, tremec tko, 3.73 gears, flowmasters

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