[Richiehd]

Putting a motor together out of some stuff I have around the garage here. Going to go in a fairly light Jeep CJ just for around town and some off road. I have a nice 350 .030 over flatops. Looking for about a 9-1 C/R I have several sets of heads but they are early heads without bolt holes for modern accessories. What heads should I look for that will work. Not interested in Vortecs or aftermarket heads, just something with 195 intakes and proper chamber size. Anyone have a casting number ?

 

[vinniekq2]

what heads are in your possession?

 

[techinspector1]

Not interested in Vortecs or aftermarket heads, just something with 195 intakes and proper chamber size. Anyone have a casting number ?

Well, good luck on finding OEM heads with 195cc intake runners. That's too much volume for a street-runner 350 anyway, in my opinion.

 

[cdminter59]

You will want to find a 76cc chambered head made after 1973 so it will have hardened seats. The 195 is that intake valve size or intake runner size? Here is a list of 76cc chamber, 1.94 intake valve heads. Last 3 digits, 997,993,882,487, 493,598, and 441.

 

[454C10]

What kind of flat tops? send a photo or part number.

What is the deck height? The amount the piston is below the deck at tdc. (Typically 0.020" but and range between 0.000 and 0.030")

Stock gm sb heads are typically between 150cc-160cc. So you will need an aftermarket head to get 195cc.

Early sbc heads are typically 64cc chambers. What casing numbers on your heads?

195cc head on a 350 is not a setup for low rpm torque. Better off with 160cc ports.

Plan on using headers for max torque.

 

[Richiehd]

Yes we will be putting headers on. And valve size, 194, sorry for the confusion not runner size. This is strctly street, no drags or hotrodding. Kids first car, he wants it to sound mean! Budget build!!
I have a set of double humps, will check casting number

 

[vinniekq2]

double hump heads are fine.

 

[ap72]

If you just want a budget street oriented build use the short block and heads you have, pick up a 268h cam, a set of headers, an HEI ignition, and dual welded thrush mufflers. It'll have a moderate "hotrod" sound but be very street friendly, durable, and easy to build.

Since its street use the only other thing I may consider is converting to EFI, even throttle body injection will be an improvement over most carbs.


That combo is nothing new or hightech, but its reliable and cheap. The mufflers will give you the sound you're looking for, you may need to adjust the idle down to about 600rpm though.

 

[Richiehd]

Why not just have the holes drilled in the heads you have. It does not cost much and is even easy to do at home.

Humps will work just find in this case.

Thought I read somewhere, castings were too thin to drill. Besides, early heads, no hardened seats.

 

[OneMoreTime]

I do not think installing hardened seats in early heads was that big a deal if you need to do the heads anyway,,

Sam

 

[ap72]

Thought I read somewhere, castings were too thin to drill. Besides, early heads, no hardened seats.

If the seats are still in decent condition and not sunk too far you probably don't even need hardened seats, on a well tuned mild build non hardened seats have proven to last just fine- I wouldn't mess with that unless it needs it.

 

[454C10]

I have tapped double humps and the holes go all the way through the head and into the valve cover area so you must use RTV on t threads. On a mild street engine regular seats are OK.

 

[techinspector1]

Kids first car, he wants it to sound mean!

Build it 9.0:1-9.5:1 and use this cam....
12-600-4 - Thumpr

Thumpr cams have gotten a bad rap from a lot of fellows, but they work fine if you're more interested in lope than total performance.