[Stan Weiss]

Originally Posted by ericwoo

So here are the numbers. Oddly the cylinders on the passenger side were similar and the cylinders on the driver size were similar but the 2 heads were drastically different.

Driver side head

• # 1: 160 psi
• # 3: 165 psi
• # 5: 160 psi
• # 7: 163 psi

Passenger side head

• # 2: 192 psi
• # 4: 188 psi
• # 5: 190 psi
• # 8: 185 psi

I take it this a street engine and wants to run on pump gas. Looking at the Passenger side cranking compression numbers. Why would I want to advance the cam?

Stan

[Green Elephant]

Originally Posted by Stan Weiss

I take it this a street engine and wants to run on pump gas. Looking at the Passenger side cranking compression numbers. Why would I want to advance the cam?

Stan

Good question Stan, I was basing that off of a post by someone earlier who said that Cliff R almost always advances Crower cams. I didn’t intend that it would be mandatory, but I guess I could have been more clear on that.
Either way I would degree the cam instead of just lining up the timing marks.
I would assume that the cranking compression on that side is due to the 65cc chambers and the decks possibly being machined. Indeed, that is a bit high for a pump gas engine.
Depending on what was discovered, the 65cc heads can be machined by Kauffman to have a larger chamber, but that would all need to be planned out before re-assembly.

[NeighborsComplaint]

If it wasn’t factory built, I’d say compression rings installed upside down on the low compression side.

[srmmmm]

Originally Posted by NeighborsComplaint

If it wasn’t factory built, I’d say compression rings installed upside down on the low compression side.

Or one bank of cylinders didn't get their finish hone.

[Jay S]

It is great that the head is fixed, disappointing that KRE didn’t make that right. But it should at least have some tuning potential now. Look at fuel and timing timing first. As I said earlier, a holley 600vac out of the box is ok on a 300ish HP engine, or even a 250 hp completely stock 350 with an anemic stock cam and a 4bbl intake. A 600 vac is not friendly to tune compared to other Holley’s, it has a jet plate on the secondaries. Before you give up on the 350, try a better carb. A 400 with that carb will have problems making much power also. There is no mention of where timing is set at, but more timing won’t help much when the fuel curve is already very lean. You would have much better results switching the carb to a qjet or a Edelbrock 750 AVS2, or a tuned 750 double pumper.

[HWYSTR455]

By the time you buy jets & rods for a E AVS2, you're only like $80-$100 away from a Street Avenger. And that's only off by another $100 for an FiTech throttle body efi.

But you would need a tank and lines.


.

[chiphead]

Just use a conversion kit to convert the 4160 to a 4150 so you can jet the secondary side.. Go back to mid-range secondary vacuum spring. The 600 should give good signal and response on that 350. I'd bet the tuning is way off and the secondaries are opening too early, making the engine feel soft. A slightly too-small carb will be more responsive than a too large carb on the street. Install a wideband O2 sensor and report back.

My first Pontiac was a 350 in a '67 Lemans, they can run.