Hi
This is Nic from Switzerland
i`m working on a 1964 - 330Cui Oldsmobile Engine for my 1964 Cutlass.
I got the block bored up to 350Cui, got fitting Flathead Pistons (Seald Power L-2320F / for Oldsmobile)
Aswell a Custom Camshaft (45degree, Dur@050 Int.224 Exh.236 / Lift Int.504 Exh.512) using "Regular Lifter" (Non Rollers)
Crankshaft redone with fitting Bearings etc. & everythings fits nice at the moment.

Now i found some Olds 7A Heads. I got those redone too like new out of the box, but here are the questions i have.

1. Question, will these Olds 7A Heads fit with my Flat Top Pistons?

For the 7A Heads i would like to use Harland Sharp Rockers "S4004 AMC/OLDS" 1.6-3/8 stud mount rockers with locking nuts, and Comp Cams 4542-16 5/16 to 3/8 pedestal
to stud conversion studs for an Olds, and Comp Cams 4842-8 pedestal to stud conversion guide plates for 5/16 (Std. diameter) push rods also made for an Olds.

2. Question, does anyone know the pushrod length for best / fitting valve train geometry with the these Harland Sharp Rockers?

Thanks for all your help
Nic

 

I cannot answer your questions but i am curious as to where you purchased that camshaft?

 

Custom Camshaft
https://www.bulletcams.com/Crankshafts/CrankInfo.html
or "dick miller racing" could help you too..

 

Buying pushrods is the final thing you do when the valve train is assembled you must measure. It is best to get just a little preload on the lifters, just enough to keep the rockers from tapping. If your rockers are adjustable then you have a little margin of error on pushrod length as you can fine tune the lifter preload.

 

Which "7A" heads? The 1972 heads with the 7A or the 1980s 307 heads with the 7A?

 

You need to CC the heads and measure how far the pistons sit from deck at TDC to figure out compression. You have a more aggressive camshaft, which will help but may be over 10 to 1 compression. I assume you plan on running Premium gas? What octane is your Premium gas there?

 

Oldsmobile 7a Heads

 

we have 95 Octane Unleaded or 98 Octane Unleaded fuel in switzerland (Europe), but for the goods of the old engine i added always "lead replacement additve" (Liqui Moly Lead Substitute)

 

Right okay. i have a adjustable checking pushrod to measure it somewhere, thanks! will try my best and hopefully find fitting ones.

 

The pictured heads should have hardened valve seats. Can someone confirm? The lead substitute won't be needed any longer.

Good luck!!!

 

All Olds heads from the 1971 model year on have hardened seats, but keep in mind that this is just local induction hardening of the cast iron and not a separate pressed-in seat. The first time you cut the seats, that hardened layer is removed.

 

Thanks Joe, I was unaware of that.

 

That’s RON, different standard than ours. You’ll need to run your 98.

 

Thank you, i tried Bullet cams a couple of weeks ago and they do not have any blanks. I will try Dick Miller.

 

Still, Question will these Olds 7A Heads (Valves) fit or squash with my Flat Top Pistons? Thanks for your feedbacks

 

Unless you have crazy lift on a tight LSA then don’t worry about valve reliefs.
And I have access to Olds cam cores, both for flat tappet and roller.

 

Thanks for your Updates!!
i will move on with the "Frankenstein" and let ya`ll know what gone happen. hahaha
Greetings
Nic