olds 307 build

General engine tech -- Drag Racing to Circle Track

Moderator: Team

gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Sun Aug 09, 2020 12:56 pm offset grind is very basic last one i had done cost 100.00
Let me know where you can get .115” offset done and it widened for the chev rod for $100

I’ll send every crank I got there
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Sun Aug 09, 2020 12:47 pm 100mm is 3.820 i believe
You initially said 100mm over

100mm is 3.937” , not 3.82”
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Sun Aug 09, 2020 12:53 pm 3.5 stroke 2" journal 6.250 rod hyper pistons about 200.00 3/500$ for rods + basic crank work how strong does the block have to be for a 400 hp build
It needs to be strong enough to keep it together..400hp is more than enough to have the main caps move.

What crank are you offset grinding for it?
rocketracer380
Pro
Pro
Posts: 331
Joined: Fri Jun 20, 2014 8:41 am
Location:

Re: olds 307 build

Post by rocketracer380 »

It’s 100mm over stock 5.3 ls bore the place is called the crank shop upstate ny I narrowed the rods not wisened the journal
rocketracer380
Pro
Pro
Posts: 331
Joined: Fri Jun 20, 2014 8:41 am
Location:

Re: olds 307 build

Post by rocketracer380 »

A cast 350 crank
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

How does it run and how much power is it making?

Cast crank from which year?
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Fri Aug 14, 2020 5:49 pm It’s 100mm over stock 5.3 ls bore the place is called the crank shop upstate ny I narrowed the rods not wisened the journal
I’m 20 min from upstate New York...can you get me the number or address of the place?

I google it and can’t find anything on the crank shop .
rocketracer380
Pro
Pro
Posts: 331
Joined: Fri Jun 20, 2014 8:41 am
Location:

Re: olds 307 build

Post by rocketracer380 »

I went thru my machine shop he might be retired but I had storm crank in my Vernon do a diesel crank the same way traded him a 454 forged steel crank for offset grinding my diesel crank he charges 250/500 depending on how much he has to take off he quoted me a price of 500.00 to do a 425 to 455 stroke on a bbc journal offset grinding an olds 350 doesn’t require much more labor to do
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Mon Aug 17, 2020 9:22 am I went thru my machine shop he might be retired but I had storm crank in my Vernon do a diesel crank the same way traded him a 454 forged steel crank for offset grinding my diesel crank he charges 250/500 depending on how much he has to take off he quoted me a price of 500.00 to do a 425 to 455 stroke on a bbc journal offset grinding an olds 350 doesn’t require much more labor to do
Nice story about getting it stroked +.115” for $100 anyway.

your still telling stories. Doing the olds bb journal from 2.5” to a bbc 2.2” is more than twice the material being removed than doing the olds sb 2.125” to the max under 2” chev sj

Also still wondering how your gonna put the 330 heads on the 307....enlighten me on that one
rocketracer380
Pro
Pro
Posts: 331
Joined: Fri Jun 20, 2014 8:41 am
Location:

Re: olds 307 build

Post by rocketracer380 »

No story have no reason to tell stories that’s what I paid as far as the head I was hopin to do the 330 head swap I was unaware that the block will not except the early heads if not I will use the 5a heads With an 1.875 1.56 valve combo
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: olds 307 build

Post by gmrocket »

rocketracer380 wrote: Tue Aug 18, 2020 6:44 pm No story have no reason to tell stories that’s what I paid as far as the head I was hopin to do the 330 head swap I was unaware that the block will not except the early heads if not I will use the 5a heads With an 1.875 1.56 valve combo
The 330’s bore is .1385” over the 307 and because of that the chambers in all 330 heads overlap the 3.800” 307 bore quite a bit.

The 307 blocks deck has 4 huge water passages close to the cyl wall with very little sealing area for the gasket,, even on a 307 with no overbore, with 307 heads , they have about .080” area for the gaskets fire rings to seal.

I’ve blown out gaskets on moderate compression builds because of that...with the 330’s bigger chamber heads , that sealing area is reduced even more to the point it’s less than half..which won’t work at all

Your stuck using the 307 egg shaped head gasket only. Cosmetic will make a smaller bore gasket, 3.8” , but they will not change the fire ring embossed diameter..which is the same for all olds head gaskets they make..it crosses right over the water passage...won’t work.

There isn’t even enough area to use a copper gasket and wire ring for earlier heads on the 307
Post Reply