374 Olds 350 stroker build

[olds307 and 403]

Took the 330 internally balanced crank out of the box. The rods fit looks good.

 

[Ugly1]

Nothing custom, off the shelf. New Scat rod, $425. For pistons, pins and rings around $650 for the Mahle 10cc dish piston in multiple oversizes. With early 350 heads, low to mid 9 to 1 compression.

You wouldn’t want to go up to 10.0-10.5 compression? Or you trying to stay with lower octane gas?

 

[64nailhead]

I'm confident you know this, but I thought it was worth mentioning, follow the break in process for whatever ring set you acquired.

After that I recommend finding out where the valves float lol 😉

 

[olds307 and 403]

You wouldn’t want to go up to 10.0-10.5 compression? Or you trying to stay with lower octane gas?

Yes, 91 is the best we can get here anyways. For me, around 400 hp and 450 ft/lbs of torque is enough. These new heads with same bottom end I am using and a roller cam with about 10 more degrees duration put out 450+ hp. I am basically running a roller cam copy of 1970 350 4 spd cam 216/217 vs 218/218 with more lift, .472/.472 vs .541/.541 and slightly tighter LSA 113 vs 112. I am building for the future. Our government is increasing the carbon tax on gas every year. Our gas is expensive enough right now. I should be able to run 87 easy with Edelbrock's head and their ultra modern chamber. I will be right at 9.5 to 1, if Edelbrock keeps the 68cc chamber. Cutlassefi suggested a slightly smaller chamber, talking 2cc and a smaller intake port opening to allow these heads to bolt on late 70's Trans Am. The heads tested had the BB0 port size, with doesn't allow the Performer manifold. Not sure how much a smaller port opening would affect the 265/195 flow numbers. The factory 350 ports were 170ish cc, the current Edelbrock are 177cc, so it shouldn't be much. I will be going with a max lean cruise with an AEM Wideband on the custom tune Qjet, I should easily see 20 mpg. Add in a 2350 stall upgraded 2004R with a 3.42 posi eventually to replace the 2.78 open, it will be a fun highway cruiser keeping up with mid range, modern muscle cars and actually make it to the next gas station.

 

[olds307 and 403]

I'm confident you know this, but I thought it was worth mentioning, follow the break in process for whatever ring set you acquired.

After that I recommend finding out where the valves float lol 😉

I will and it will get multiple, short oil changes before I really hammer on it.

 

[Ugly1]

Yes, 91 is the best we can get here anyways. For me, around 400 hp and 450 ft/lbs of torque is enough. These new heads with same bottom end I am using and a roller cam with about 10 more degrees duration put out 450+ hp. I am basically running a roller cam copy of 1970 350 4 spd cam 216/217 vs 218/218 with more lift, .472/.472 vs .541/.541 and slightly tighter LSA 113 vs 112. I am building for the future. Our government is increasing the carbon tax on gas every year. Our gas is expensive enough right now. I should be able to run 87 easy with Edelbrock's head and their ultra modern chamber. I will be right at 9.5 to 1, if Edelbrock keeps the 68cc chamber. Cutlassefi suggested a slightly smaller chamber, talking 2cc and a smaller intake port opening to allow these heads to bolt on late 70's Trans Am. The heads tested had the BB0 port size, with doesn't allow the Performer manifold. Not sure how much a smaller port opening would affect the 265/195 flow numbers. The factory 350 ports were 170ish cc, the current Edelbrock are 177cc, so it shouldn't be much. I will be going with a max lean cruise with an AEM Wideband on the custom tune Qjet, I should easily see 20 mpg. Add in a 2350 stall upgraded 2004R with a 3.42 posi eventually to replace the 2.78 open, it will be a fun highway cruiser keeping up with mid range, modern muscle cars and actually make it to the next gas station.

They have a video of a top engine rebuilder doing up a 350 Olds for a guy’s 350 Rally. They used the stock heads and tried stock intake vs. Edelbrock. Not a big difference but did end up using the Edelbrock intake. Ended getting 385/395 hp. W/roller setup. May be worth looking it up.
You must be up in Canada. Have a friend running into the same stuff in Nova Scotia.

 

[olds307 and 403]

Yes, Melville Saskatchewan Canada. Just preparing for the worst. At least 91 is still non Ethanol here. I saw that, it was the regular Performer intake. The RPM has bigger runners and is 2" taller than the Performer, it is a much better intake.

 

[Ugly1]

Yes, Melville Saskatchewan Canada. Just preparing for the worst. At least 91 is still non Ethanol here. I saw that, it was the regular Performer intake. The RPM has bigger runners and is 2" taller than the Performer, it is a much better intake.

In process of pulling a 1968 350 to put in storage stock 4bbl motor with #5 heads. If the Chevy 350 doesn’t make me happy I’m thinking of going with that and make it a 355cid.
You could always add a Centrifugal Supercharger Kit 😉

 

[olds307 and 403]

In process of pulling a 1968 350 to put in storage stock 4bbl motor with #5 heads. If the Chevy 350 doesn’t make me happy I’m thinking of going with that and make it a 355cid.

Between the Mahle DSS 10cc dish and DSS 12cc dish forged stock rod replacement pistons, you are covered for 4.065" to 4.155" oversizes between the two. Both will give low to mid 9's compression wiki the #5 heads.