Engine rebuilt

[philip]

I guys

After 56 years and only 90 000 km , i have planed to rebuilt my 327 L30 engine.
It run well , but i have a lot of oil leaks and a greasy spark plug in cyl 8.
I m in France ,so i need to order in US and like tomake only one order.
I would like to know if it’s pissible to install 3/8 valve pushrod instead the 5/16 ?
I don’t know for the moment the size orginaly installed in my block , but i find 2 sizes.
So i think bigger is better but do they fit ?

Thanks for your help

Merry xmas and happy new year

Philippe

[Stingr69]

The bigger aftermarket pushrods will not fit without cylinder head machine work.  You would need to drill out the original obround pushrod holes to a larger diameter to accept the bigger diameter pushrod.  The rocker arm studs would all be pulled out then the tops of the bosses are cut down about 1/4" or so.  The rocker arm stud holes are then drilled and thread tapped for screw-in studs.  You would need to buy wider slot steel pushrod guide plates to match the new larger diameter pushrods as well.

You might be able to use a later design guided-tip rocker arm and avoid the extra rocker stud machine work and special guide plates but the pushrod holes still would need to be opened up. Those guided tip rocker arms are only for hydraulic cams because you cant get a feeler gauge in there to set the lash.

Bottom line - you probably want to stick to the smaller (stock) pushrod design  Keep it simple.

[tomstiel]

great advice

[philip]

Thanks
I check , theycare 5/16 so i will order the same if needed...

[philip]

Ok engine us out the bay and i start to rebuilt it.....
Seams to be only 90 000 km , very low carbon deposit at piston top.

[philip]

More pictures

[philip]

And some others

[Stingr69]

You need to read this link below.  Your intake manifold needs to be addressed.


https://www.corvetteforum.com/forums/c3-tech-performance/1978483-early-c3-q-jet-base-gasket-tech-info-the-hot-slot-intake-manifold-problem.html

[philip]

Don’t worry , i have blocked the exhaust gaz passage under the carb for several year.
Now i d7d the same for the entired manifold.
We don’t have low  outside temp here in france....

[philip]

Done

[David K]

Nice job! Can I get a close up pictures of the trim tags?

[philip]

Sure

[philip]

More

[x66 714]

Lose the Ford decal on the fan shroud. No 1st gen ever had one....Joe

[fsc66]

Agree with Joe a real pet peeve of mine those damn FORD only, orange caution decals are sold by loads of Chevrolet retailers as correct for Chevrolet. Constantly see them at high end car shows and continue to advise people, they are incorrect and a FORD only product

Paul