374 Olds 350 stroker build

64nailhead

Goat Herder
Supporting Member
Dec 1, 2014
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Upstate NY
What are you expecting from this in terms of hp and tq improvements?

Can you get these heads to perform is my 1st question? I like the roller cam.
 
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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,108
113
Melville,Saskatchewan
I repeat Scat and Molnar just came out with DIRECT FIT connecting rods for the Oldsmobile 350. They bolt to any Oldsmobile 260 through 403 crankshaft. The 10cc dish Mahle piston fits these rods and all stock 350's. They have the new 1 mm ring packs. With 64 to 72 stock heads, mid 9 to 1 compression. If your customer has #8 heads with a virgin block in good shape, common on the 73 to 76 motors, CP has a hone to fit 4.065" hone to fit forged piston brought to the market by BTR. The Mahle pistons start with a hone to fit 4.065" oversize, no boring on a good block. Oversizes all the way up to a 4.155" bore. Pretty much all Olds 350 blocks up to 76 can go .100" oversize. Mark Remmel, Cutlassefi brought both these products to the market. His contact info is Fastone01@hotmail.com.
 

olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,108
113
Melville,Saskatchewan
What are you expecting from this in terms of hp and tq improvements?

Can you get these heads to perform is my 1st question? I like the roller cam.
It should be an easy 450/450. Cutlassefi flowed 7A heads with W31 valves, 2"/1.625" and a bowl hog cut. They were 210/170 for flow. Mine have 2.07/1.56 valves, so they might be 215/165 as is. No reason they won't flow 225/175 with some blending of the bowl hog cut into the port, tear dropping the guide bosses and removing the air bumps. Maxed out, any 64 to 76 Olds 350 head can match stock Edelbrock heads, about 270/190.
 

1320John$$$

G-Body Guru
Sep 18, 2019
844
93
Pennsylvania
I repeat Scat and Molnar just came out with DIRECT FIT connecting rods for the Oldsmobile 350. They bolt to any Oldsmobile 260 through 403 crankshaft. The 10cc dish Mahle piston fits these rods and all stock 350's. They have the new 1 mm ring packs. With 64 to 72 stock heads, mid 9 to 1 compression. If your customer has #8 heads with a virgin block in good shape, common on the 73 to 76 motors, CP has a hone to fit 4.065" hone to fit forged piston brought to the market by BTR. The Mahle pistons start with a hone to fit 4.065" oversize, no boring on a good block. Oversizes all the way up to a 4.155" bore. Pretty much all Olds 350 blocks up to 76 can go .100" oversize. Mark Remmel, Cutlassefi brought both these products to the market. His contact info is Fastone01@hotmail.com.
So what does this have to do with offset grinding to 330 crank to finish Chevy rod that’s what I wanna do that’s what I’m talking about not buying Oldsmobile parts I want to do what you’re doing the stroker350 motor
 

500/600

Royal Smart Person
Supporting Member
Nov 17, 2018
1,170
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West Virginia

olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,108
113
Melville,Saskatchewan
I'm curious to see how the gas block holds up. Didn't know about the Scat rods. I'd love to try them, but the next build is just a stocker 350 for Funzalo reasons.
I saw a boosted gas 350 block pushing 900 hp on the old ROP. Obviously, that is a grenade with the pin already pulled, it could go off at any minute😁. Bill Travato claims 650 hp. It even has thinner main than the BBO but way less rotating weight. I just want something reliable, can hit reasonable rpm and not boil over every 10 miles. A 403 isn't it for me but I bought parts for one and have a 403 block.
 
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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,108
113
Melville,Saskatchewan
So what does this have to do with offset grinding to 330 crank to finish Chevy rod that’s what I wanna do that’s what I’m talking about not buying Oldsmobile parts I want to do what you’re doing the stroker350 motor
Offset grind the crank for either the small journal sbc or Honda rod, a standard N crank can also be used, widen the rod journals the correct amount when the crank is ground. CP has a 1.3cc dish forged piston, 4.125" 1.550" compression height for a 374 ci Olds stroker with a sbc small journal 6" rod. I plan on using the icon 15.2cc dish piston in a 4.125" bore with a 1.561" compression height with a 6" Scat small journal rod for 9.5 to 1.
 

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