Smallblock (Chevrolet) Pistons

[Andreasu]

Hey, I'm trying to figure out which pistons I should use in my 307.



The bore is 3.875".

http://www.summitracing.com/parts/STL-H997CP/

Would these fit in a sbc? Having a hard time finding Hyp.alu. pistons to 307.

[TT302Z28]

1st. You need to know that a 307 is a small bore with a 327 crank. We have punched many of these to 4.00" bore over the years with lots to spare. your machine shop should be sonic testing cylinders before boring anyways so this is something that can be varified before boring.

2. If you bore this to 4.00" you now have a standard bore 327. This means you buy std bore 327 pistons and get a larger engine!

[Andreasu]

Can the 307 really be bore'd 0.125"? Ain't that like 3-4mm? If it's possible, I would go that way.

[CarPlayLB]

Why?
350 small blocks grow on trees. For what you'll spend in machine work and parts, you could have a 350.
If a 305 can go .125 over...why? The walls will be paper thin...and again..why? Get on Craigslist and find a cheap 350 core and call it a day! Bet you could find a complete longblock core for less than $300. If you are in love with the 305 heads, buy low compression pistons cause the 58cc chambers will squeeze it a bit.

[b-man]

350 Chevy blocks might grow on trees here in the USA, but not in Norway where Andreas lives if I'm not mistaken.

I looked back at a few of the posts made here by Andreas and found that out.

You should put your location in your profile so nobody has to guess, parts availability varies quite a bit around the globe.

[Andreasu]

Why?
350 small blocks grow on trees. For what you'll spend in machine work and parts, you could have a 350.
If a 305 can go .125 over...why? The walls will be paper thin...and again..why? Get on Craigslist and find a cheap 350 core and call it a day! Bet you could find a complete longblock core for less than $300. If you are in love with the 305 heads, buy low compression pistons cause the 58cc chambers will squeeze it a bit.

First, I never talked about using the 305 heads, I talked about to bore a 307 and put some 350 heads on it.

[Andreasu]

350 Chevy blocks might grow on trees here in the USA, but not in Norway where Andreas lives if I'm not mistaken.

I looked back at a few of the posts made here by Andreas and found that out.

You should put your location in your profile so nobody has to guess, parts availability varies quite a bit around the globe.

Well, 350 aren't to rare here, we got 2 actually, but one with rust/bad sylinder walls and one with some bad sounds coming from the crank (Running but not running good). I guess the second one is saveable, If it just some bad main bearings.

[CarPlayLB]

My bad Andreasu! I did not see the Norway address!

Can you make one good 350 outta both the bad ones?

[JEFFTATE]

Make a nice high revving 327 out of it !!
They're cool !!

[Andreasu]

My bad Andreasu! I did not see the Norway address!

Can you make one good 350 outta both the bad ones?

Well, I heard the 350 with bad main bearings run, so that one is saveable. But, I don't know if i'm going to use the 307 or 350, easy pick as it might appear, but a 0.30" bore'd 307 (311,4 ci) with some 350 heads seems like a fun challenge : )

[b-man]

I've heard of 307 blocks going to 4" bore before, after a sonic check you just might get lucky.

307 blocks with casting# 3970020 might be the best bet to go to a 4" bore according to this thread:

http://www.hotrodders.com/forum/chev...ns-124065.html