3500 crank

[El_Diablo]

so correct me if im wrong because i prolly am

the crank can be offset ground down to the earlier engines size so you can now use the early SBC rods without much work and since the sbc rods come in the same shorter length as the earlier 3x00 rods then that should fix the length issue you would have with offset grinding and a stock 3500 length rod, correct? also, wouldn't the different length needed also change the effective stroke?

the 3.7 i remember though had a stock bore IIRC, maybe he was .020 over though?

[Monzsta]

The 3500 rod is 5.9", I coudn't find the rod length of a 3400 on Alldata or Mitchell. Chevy rods are stock length at 5.7", altho nearly any length can be ordered. The difference of .200" leaves the stock height 3400 piston about -.075" in the hole..

Lots of engines share the 92mm (3.62") bore, so it would only be a matter of searching to yeild a piston with the correct pin height to get zero deck.

With the 60 degree deck height of 8.818", minus the stroke divided by 2, minus the rod length, and you need a piston with around 1.333" pin height. The stock 3500 piston has a 1.263" pin height.
(8.818 -(3.56/2)-5.7=1.333)

[Monzsta]

Found the GAGT thread on 3.7's...

http://www.grandamgt.com/forum/showthread.php?t=61383

[sharkey]

in the case of building a stroker motor like this it isnt cheap, so why cheap out and use stock pistons, even if they are for something else???

another thing to keep in mind here is the idea rod ratio, wich is supposed to be 1.72. a 5.7" rod with a 3.56 stroke is 1.60, however the 5.9" rod puts you at 1.65, a little closer. in theory a 6.1" rod would be ideal, however that leaves you with a pin height of .989, the top of the pin bore would be .525" from the top of the piston.

just some numbers to think about

[Monzsta]

in the case of building a stroker motor like this it isnt cheap, so why cheap out and use stock pistons, even if they are for something else???

Ford 4.6 engines have a 92mm bore, and I'll bet a set of forged pistons for that would be lots cheaper then a custom set from Ross or JE. That was my line of thinking, not cheaping out.

[34blazer]

Ford 4.6 engines have a 92mm bore, and I'll bet a set of forged pistons for that would be lots cheaper then a custom set from Ross or JE. That was my line of thinking, not cheaping out.

do those use a pin that will work with the sbc rods?

[blkalero]

so correct me if im wrong because I prolly am

the crank can be offset ground down to the earlier engines size so you can now use the early SBC rods without much work and since the sbc rods come in the same shorter length as the earlier 3x00 rods then that should fix the length issue you would have with offset grinding and a stock 3500 length rod, correct? also, wouldn't the different length needed also change the effective stroke?

the 3.7 i remember though had a stock bore IIRC, maybe he was .020 over though?

I started the 3.7L strocker for my alero.. as of right now its not on my to do or finish list.
the engine is bored .020 over the rest was done with the crank.
they miscalculated how much we could go so we ended up welding the crank to get our longer stroke. this was only an option because the crank is foreged steel.

but we started with the jbody crank which I have found is a 3500 crank with part number removed and modified crank sensor wheel to work in the 3.1/3100/3400 engines
they sent it to me with the journals untouched so they had to be ground to take the sbc or 3400 rods. This is why i decided to offset grind and do a stroker. since the miscalculation was not on my part the only added expinse is a little more time to ballence. psitons were custom either way with no additional cost for different placement of the wristpin hole

[Superdave]

now you guys have me thinking...

3500 block bored .050 and .25 added to the stroke gives you 235 CID (up from 214) Which is 3.9 Liters

[sharkey]

yes it is. and a 3900 bored .060 over with a 3.560 stroke is 263 ci, or 4.3l. now that would be hillarious to have 4.3l badges on the side of a cavy and confuse the hel out of people when they look at the motor.

[ForcedFirebird]

yes it is. and a 3900 bored .060 over with a 3.560 stroke is 263 ci, or 4.3l. now that would be hillarious to have 4.3l badges on the side of a cavy and confuse the hel out of people when they look at the motor.

That would be the shizit, a 263ci 60*.

[El_Diablo]

so can anyone give me the measurements i need to make this work?

the idea is offset grind a 3500 crank .250 in a 3500 block (so 92mm bore?) with sbc rods but what would the rod length, stroke and displacement numbers be?

[Monzsta]

I started the 3.7L strocker for my alero.. as of right now its not on my to do or finish list.
the engine is bored .020 over the rest was done with the crank.
they miscalculated how much we could go so we ended up welding the crank to get our longer stroke. this was only an option because the crank is foreged steel.

but we started with the jbody crank which I have found is a 3500 crank with part number removed and modified crank sensor wheel to work in the 3.1/3100/3400 engines
they sent it to me with the journals untouched so they had to be ground to take the sbc or 3400 rods. This is why i decided to offset grind and do a stroker. since the miscalculation was not on my part the only added expinse is a little more time to ballence. psitons were custom either way with no additional cost for different placement of the wristpin hole

So let's have the gory details.. Where did the block get in the way, any other clearance issues, and what did the pistons cost? There's a 3900 on ebay right now for $1,200... might be time to go hunting..

[zofo61]

I would be interested in this option as well......but boosted

[zofo61]

Bump....keep this thread alive..............!!

[El_Diablo]

i really need those questions answered