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I figured with 10% drive train losses that my engine is making 345 horsepower to the flywheel which is 1 hp per cubic inch. I am no engine expert or anything and am happy with the motor as its really fun on the street. Just wondering if this is typical power output with this combo?

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Your compression ratio is a bit low. Why did you drop it to 9.5:1? With the aluminum Edlebrock heads, 10.5:1 should have been easy.

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Aha! That might explain it. The engine has the same pistons from decades ago and I'm just working with what I got. Pistons are TRW L2385's and compression might actually be 8.5 to 1 ? I think my heads are 63 cc's

Next 340 that I build will have higher compression and that Ritter aluminum block

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Your compression ratio is a bit low. Why did you drop it to 9.5:1? With the aluminum Edlebrock heads, 10.5:1 should have been easy.

For the CR you have, your power output is about as one would expect. Pretty conservative build from what I can tell. With just a bit more work, you could have been up closer to 400 HP and still very streetable.

Astrobuf

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With the gas out here running 91 octane and true measured 9.5 to 10.1 with a smaller cam is realistic.

Sure it would make more HP with higher compression but he might end up dialing the timing back doing a lot of street driving in traffic in a city with true pump 91 octane.

314 wheel dyno HP at 20% drivetrain loss with a stick is 392.5 flywheel HP. Pretty close to the 400 HP number.

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Your compression ratio is a bit low. Why did you drop it to 9.5:1? With the aluminum Edlebrock heads, 10.5:1 should have been easy.

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Aha! That might explain it. The engine has the same pistons from decades ago and I'm just working with what I got. Pistons are TRW L2385's and compression might actually be 8.5 to 1 ? I think my heads are 63 cc's

Next 340 that I build will have higher compression and that Ritter aluminum block

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Sounds about right for a 340 with what you have, are the heads ported or OOTB? One more thing, I thought you were going to do a Predator headed BB awhile back?

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The heads are untouched and are out of the box

I still have all my Predator stuff but I'm getting rid of it because I'm going road racing and its overkill
I want to do an all aluminum 340 with the Ritter aluminum block. If the aluminum small block came out years ago I would never have bought the Predator setup

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When I built my last 340 in 2007, I used KB-243 standard pistons and they were .029" above the deck.

Then I used the open chamber Edlebrock heads designed for the hi compression early motors. I CC the heads and had 10.4-1 compression and it runs fine on 91 octane fuel for close to 18K miles now.

IMO, I hate decking heads and blocks, I rarely have it done as it messes up your top end fit. Plus you can never put it back.

Use the right parts and don't cut the heads or block, imo.

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