Mdl442

I have a 1985 olds 442 with 200 r4, 373 rear end. starting rebuild on a 1968 olds 350, #5 heads,. Was a 2 barell motor. Was thinking of putting 10.25 pistons, leaving #5 alone except 3 angle valve and general clean up. Was wondering what would be best approach at making good street power. Should I bore it 30 over, put new springs etc on heads? Was going to have block gone over new berrings etc, what would be a good cam? Trying to keep compression around 9.5 . Any good advice would be helpful. I built a stout 10.1 307 but just not enough grunt any more. Thanks for any replies.

Mdl442

Hi my name is mark, I have a 1985 olds 442 with 200 r4, 373 rear.
I'm building a 1968 olds 350 with #5 heads, would like some info on building a good street motor.
Was thinking 10.25 pistons
Just cleaning heads 3 angle valve job.
Maybe a cam kit?
Would like to be around 9.5 comp
Any ideas?
Going g to have block cleaned new bearings etc.
Thanks for any input.

coppercutlass

By 10.25 pistons do you mean advertised ??? Im running a 355 olds i built with 10 to 1 compression on pump gas 93 with # 6 heads with just big valves , Lunati voodoo cam , th350 that i also built backed by 3.90 gears runs 12.4's in my 72 cutlass. Lots more to the combo but i dont want to flood the thread unless you have intrest in the combo im running. Its still a street car and has great street manners.

Mdl442

This is the first time trying to build a motor on my own.looking for a good reliable street motor that is faster than my 10.1 307.

Mdl442

Yes to advertise compression. I figured I won't be near that maybe 9.5 with some head milling

don71

Welcome to the site Mark. Have you spoke with a machine shop in your area yet? They will have some of the answers for you. Your budget will be an important topic in this discussion.

don71

Hi Mark. Since you've been around the block with your 307 that should be a good primer on what to do with the 350.

About boring, you will most likely need to bore it out. At .020 leaves you little piston choice, so .030 is logical. But what does the bore say? Will it clean up at .020?It needs to be measured. Like my other post too you, find a machine shop and share your goals with them..and your budget.

The valve spring pressures should match the cam you purchase. Make sure they jive together.

I won't give cam suggestions, thats like picking girlfriends.

Try to build the stoutest short block you can within your budget. If its done right, you can build even more on it later. Put the best piston you can in there.

coppercutlass

here is my combo


355 Olds in my 72 cutlass 3400 lbs with me in it.

10 to 1 compression speed pro flat tops
lunati voodoo cam 522/539 lift 233/241 duration @ .050 lift
Prw roller tip rocker (7) and one comp cams roller tip rocker
Pro gear timing chain
#6 heads done by rocket racing just bowl work 2.07 in. 1.63 ex.
full length headers ,x pipe
34 degrees of timing on 93 octane
edelbrock performer rpm intake
holley 3310 750 cfm carb box stock
proform hei dist

Th350 3000 stall 3.90 gears.

engine and trans built by me.

Runs 12.4's in the 1/4 mile and gets driven to the track and back. Its seems basic and its bare bones but it works.

coppercutlass

we all like videos. lol .