425 wheat

Hey guys,
I'm new here and love olds.I have a 65 425 :30 over ported a heads comp(230/230 280/280 490/490.elderblock. intake and 750 h
olly.with a 390 eaton posi...
I'm wondering what kinda time I should get. I have 10:5:1compression and need 2 redo my exhaust.should I go 3 " or. 2and a half.. ? It will need mostly street.. I do have 28/10 . Its. My first build and was wondering if I'm going n the right direction.?and if anyone knows about that cam.thanks

425 wheat

Hey guys,
I have a th 350 trans and wanted to know how to adjust my shift points.I put a 65 425 n and now it shi
fts @ 4 grand wide open .id like it to shift @ 5200 without puttin my hands on the shifter.it use to shift @ 5200 before the motor swap..anyhelp would b appreciated

2blu442

Welcome to the site! Sorry, I can't answer either of your questions, but this will bring it back to the top where hopefully someone else will see it and reply.
John

425 wheat

Thanks john..

SBORule

What cam is that a 268H ? If so, I knew a guy who ran one in a 455 in a 1984 Delta 98 and it ran high 12s low 13s. Don't know what rear gear ratio he was running but it did have slicks.

If you want to make your trans shift at a higher 5200 rpm's without shifting manually, you are going to have to play around with the Governor springs and weights.

I would just shift manually when you want it to shift at higher rpm's.

425 wheat

Sbo
Do u think the390 gear is good? The cam is comp hyd flat tappet magnum 280h..haven't had time 2 nail it yet...and thanks

425 wheat

I'm also wondering how many how much hp I have the builder says about475..would that b right?... the moter is rated 370 hp stock..a .30 bore polish and port on the intake and heads mild came and a 750 .if it does that I'm n heaven. 4 my 1 st build. Feedback guys...thanks..

cutlassefi

I didn't see what intake you had but I'd say the hp would be in the 425-440 range. Not enough cam to have much more hp unless you have REALLY good heads.

425 wheat

Cutlassefi ,
Thanks a bunch..the intake is a rpm and the heads are A # 383821. That's fair for a first build..? U guys r the best. What can would give me a tad more.? I'm n md and got a feel chevy and ford guys thinkin olds don't hold their own.lol

425 wheat

Is that cam ok? And or what would u recomend?, id b happy wit a 12:80 for a while..wish I was a member a while sonner.anyway hope its a good runner I know it pulls hard..just know et get.

SBORule

3.90 gear should be fine but try to run the tallest tire you can fit, like 295/60/15
or a 29.5 x 9 or 10" tire. You'll have to ask around what the tallest tire that will fit your car.

I don't know what the spec's are on the 280H but it should do the job considering a 268H could get you into the 12s.

425 wheat

Y thank u,my tiers r 275 60 15 street slick will upgrade..u the man thanks

425 wheat

And they r 10" w

NAS Backyard

Interesting info, I'm picking up 2 65 425's this weekend, a Starfire and a Jetstar 1 ,with autos. Considering a build with a 4 speed for my 61 Olds 88. Should run pretty good with what you have. That cam sounds about right.

425 wheat

Will update on how it runs with the 390's this and@ bruce love the " black momba"

425 wheat

I think u will b more than pleased with the 425, mine really pulls like a truck lol, should get get but the
summer. Olds is the way to go...

droptopron

425 Wheat, no disrespect to this forum but you should try to sign on to realoldspower.com and raise your questions there. You have some serious Olds racers there.
Also, take it easy on the short hand. You're not texting. If you want a clear answer ask a clear question.