Pump Gas 91 octane 385 SBC

[SpeierRacingHeads]

THIS IS FOR THE SOLE PURPOSE OF DISCUSSION! I don't build engines normally, just helping a local!

547@6700 and 495@4900

4.04 x 3.750
Molnar crank and rods
SRH v2.45BI heads (220cc)
Flow 275@.660 through carb manifold
Hurricane burr finished manifold
PBM/Erson -5cc pistons
10.70 compression (175 Cpsi)
Erson 253/260 soild roller
.660 both sides at retainer
106 ICL 110 LSA
KMotion 1150 springs
Belt driven accessories
Siebert 750 carburetor
Moroso 4 hole
1.750 headers, 32" long
91 Octane from Super Market
HEI distributor
37º of timing

[PRH]

Nice real world build.

But I def think it would have made another 10-15 with red plug wires.

Dart copy heads?

Btw, do you find those springs show noticeably more load than advertised?

[SpeierRacingHeads]

Nice real world build.

But I def think it would have made another 10-15 with red plug wires.

Dart copy heads?

Btw, do you find those springs show noticeably more load than advertised?

Yea, those wires... lol..

Yes, ProHeader straight plug with CNC program

Yes, lots more load. But I usually see a big drop after cycle. I'm going to pull one off and bench test it. These went in at 275@1.950 and 610@1.290. I will post that up also.

[PRH]

Years ago I used to use quite a few k-1100’s for the mild roller stuff.
They always tested really close to spec, and would hardly lose anything, even after quite a bit of use(if not being run into any serious float).
Then one day, I bought another set...... and nothing about them was the same.
They loads were way high, and they didn’t look the same at all(different color material, number of coils, etc)
I thought the may have been mislabeled 1150’s, but the open load was a little lite.

I bought them to replace a set from some heads I was freshening, and ended up not using them. The ootb loads were quite a bit higher than I wanted, and I wasn’t sure if they’d settle back to the spec quickly or not.
I put some Isky 9315’s on instead....... which are very close to what the “old” k-1100’s were.

[SpeierRacingHeads]

For even more discussion.

Jones cam program, and actual Erson that was in it. Also notice the performance box!

[SpeierRacingHeads]

Springs settled in at 250@1.950 and 605@1.290

[PRH]

That’s pretty close to spec.

In theory they would be 256@1.950/606@1.290.

Spec is 531lb/in, your observed is 537.8lb/in.

[SpeierRacingHeads]

91 octane

[F-BIRD'88]

Got to wonder how much more power this pump gas friendly street capable engine would make with a Tunnel Ram and 2x 750 carbs. And then how much more if then the cam was optimimized for best power with the tunnel ram. I suggest it will get to or very near 600bhp all while being pump gas friendly.
Nice build.

[econo racer]

Would it make more torque at a lower rpm with a 200-210 runner? Also how much power would it lose with smaller heads? Nice build

[GARY C]

Would it make more torque at a lower rpm with a 200-210 runner? Also how much power would it lose with smaller heads? Nice build

One could ask the same about the Jones cam program 108 vs the engines 110 but without testing the 10 "what if''s, no one will ever know. The combo clearly makes good power and if that is the power you are seeking he just put it on paper for you in a provable form.

[paulzig]

Would it make more torque at a lower rpm with a 200-210 runner? Also how much power would it lose with smaller heads? Nice build

Pull starts 4000 and its at 438LBS already as low as that, then peak is 495@4900 ....

I cant see you wanting it much lower than that...

[Orr89rocz]

If im not mistaken this deal made 600 with better fuel and more vacuum applied. Very stout streetable machine

[3V Performance]

Springs settled in at 250@1.950 and 605@1.290

Chad we really need to work on this.. LOL "Pump gas street engine" ugh

[SpeierRacingHeads]

Would it make more torque at a lower rpm with a 200-210 runner? Also how much power would it lose with smaller heads? Nice build

The engine already had these heads, and I had a program.

If it would have been a fresh build, I would have used my 205cc port.

I built a 4.155 x 3.500 drag engine with a set and it made great power on the same dyno.