[cdminter59]

I looked the pistons up on Summit Racings by the brand he gave. They list 3 with the -3.5 dome. All 3 the compression height is listed as 1.560 for the Speed Pro hypers.

[Caballerokid]

The edelbrock performer intake i have is a dual plane. Also i have seen dyno results of the very same engine with a performer and air gap. The curves were almost identical but tue air gap made more peak hp.

The crank is a stock 350 crank and i do have rebuilder pistons. I run 91 or 93 octane regularly and have ran 110 leaded initially until i was comfortable with the setup. The calculators i have used showed something like 10.2:1 static and 9.67:1 dynamic.

[Caballerokid]

The way i checked the quench was just a quick check since things were already together i used a dial indicator to get dead 0 and then used a straight edge and then roughly measured it.

[ap72]

Originally Posted by Caballerokid

The edelbrock performer intake i have is a dual plane. Also i have seen dyno results of the very same engine with a performer and air gap. The curves were almost identical but tue air gap made more peak hp.

The crank is a stock 350 crank and i do have rebuilder pistons. I run 91 or 93 octane regularly and have ran 110 leaded initially until i was comfortable with the setup. The calculators i have used showed something like 10.2:1 static and 9.67:1 dynamic.

you may have seen this or that comparison but the performer intake is not as good as the RPM. period. BUT your heads are easily your biggest restriction.

[Caballerokid]

I very much agree with you! Wjat do you think of the fast as cast trickflow heads i mentioned earlier? Would those be a good choice for this motor?

[Caballerokid]

Originally Posted by cdminter59

I looked the pistons up on Summit Racings by the brand he gave. They list 3 with the -3.5 dome. All 3 the compression height is listed as 1.560 for the Speed Pro hypers.

Here are the pistons I have Speed-Pro Hypereutectic Pistons ZH618CP60 - SummitRacing.com. They are 1.560.

[cdminter59]

Caballerokid, I use this website for informational purposes. CamQuest ? Select The Perfect Camshaft & Valve Train Components Checking cams with different heads,compression, carbs, etc. I found a cam similar to yours. It a Comp Cam 12-210-2, 1500-5500, .454/.454/ 218/218 LSA 110 ICL 106. When checking it on the dyno it made 310@4500 hp and 395@3500 Torque with low perf/stock ports & valves, dual plane intake-std flo, 600 cfm carb. I guessing your cam has about 295hp and 364 lbs Torque at the flywheel. Look on your dyno sheet to find out at what RPM you made the 250hp and 317 TQ. Changing heads to HP stock ports and valves, dual plane intake hi-flow, and 750 cfm carb, the increase is 368hp@5000 and 428 lbs Tq@ 4000. Pocket porting the heads increase it to 415hp@5000 and 442 lbs tq@ 4000. Now it might affect yours a little differently because of the 106 LSA and 102 ICL. If you was going to spend that kind of money get these: AFR 180cc SBC Eliminator Street Heads 0911 - SummitRacing.com or these: AFR 195cc SBC Eliminator Street Heads 1036 - SummitRacing.com or these: I would get these. Dart SHP Special High Performance Cylinder Heads 127222 - SummitRacing.com. Then dump that Crane cam and try one of these XE262H 12-238-2 or XE268H 12-242-2. Make sure to order the heads with the springs that will work with these two cams. I have been trying to warn you about your compression that it's too high even for aluminum heads with pump gas.

[Caballerokid]

Thats a really cool tool to get an idea of how the cams perform. My problem now is that i'm looking at a 2k tab to gain 100-150hp... that just doesnt seem good enough. For that kind of money I can get a turbo LS setup started and making 500 or more hp. Hmm...

[ap72]

Originally Posted by Caballerokid

Thats a really cool tool to get an idea of how the cams perform. My problem now is that i'm looking at a 2k tab to gain 100-150hp... that just doesnt seem good enough. For that kind of money I can get a turbo LS setup started and making 500 or more hp. Hmm...

yep. Although you could also just slap a turbo on what you have, it'll require special fuel thanks to those damn pistons but still capable of 500hp with the right turbo and tuning.

[Caballerokid]

I have thought about that but I'd have to tear the motor down completely so I can cut the rings for blown/turbo application. I'm worried about that to even put a turbo on it because of that. Would I even really need to worry if I ran 5-10lbs? I don't think I'd want any more than that with the compression where it is already... I'm just trying to rethink my plan on this right now. I feel stuck.

[ap72]

If you're going to go through the trouble of increasing the gap on your rings I'd swap in some flat top or dished pistons while you're there. A good set of used pistons would work if you're careful.

Then again you could just swap your cam into a used stock long block, which you can often find for a couple hundred bucks.

[cdminter59]

Yep! I never known anybody to build a small block for the street with dome pistons. They are for a race setup. To mill the dome would probably cost as much as another set of pistons if it could be done. Sometime the domes are hollow.

[454 Made in Flint]

Originally Posted by ap72

To solve this whole problem I'd just give up on peak power numbers (they're meaningless on the street) and focus on getting your midrange as high as possible. Build for where you drive, not for the dyno sheet that rides in the glovebox with you.

A wise man once said, "Horsepower sells cars, Torque wins races"

[cdminter59]

I would not spend anymore money on the engine except to tune. You have a 4 speed transmission, I would spend some money on a set of 3.42 or 3.55 ring and pinion gears. Take it to a drag strip during test and tune to get some time slips. Post the info back here. I sure some one will have some answers comparing the time slip info and the dyno info as for why your hp numbers seem low. How is you timing curve set up? How much engine vacuum do you have? Check all of this to make sure everything is right.

[ap72]

Originally Posted by 454 Made in Flint

A wise man once said, "Horsepower sells cars, Torque wins races"

um... that could be the dumbest man alive. Torque in itself has never done a damn thing.

Horsepower gets the groceries and wins the races- it's all the same even though the application is different.