Two 427s

[Stefano]

The carb spacer can be worth 20hp +/-.

[KenMaisano]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Vortecpro</div><div class="ubbcode-body">
Thanks for the replies. Engine number 1. has been tested and made 575 HP @ 6500 RPM, very impressive when you consider the factory cam specs, I could see the vacuum coming in at 16 inches at idle. I ran the the engine to 6600 and was down 1 HP, I really like the way the 427 carries the power out, this is very important to me. Engine number 2. will be tested this week, I will post the results. Its interesting todays 236 headed flattop piston Super Stock 454 makes right at 720 HP, with the 049 headed version making 740. Ken, I would be interested in where your S/S 454 peaked?</div></div>

If my memory serves me right, I believe it was 6700 RPMs This was with a Comp 280 284 [email protected] 748 748 110 in@ 108 Lash IN..040 EX. .025

[69z28302]

I'd like to see the torque numbers on both engines.

[Vortecpro]

Here you go, not the best pull but a good average one. Engine 1.

[Mk IV Muscle]

Something tells me that engine 2 will have quite a bit more area under the curve... [img]<<GRAEMLIN_URL>>/smile.gif[/img]

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Vortecpro</div><div class="ubbcode-body">Engine 1.

Blue printed .060 over L72 427, 12.2 compression, 242/242 520/520 solid lifter cam, stamped LS-6 rocker arms, stock GM 840 rectangle port heads, 2.190/1.720 valves, factory 163 intake, 4 quart factory oil pan.

Engine 2.

.060 over 427 10.3 compression, 264/264 560/560 solid lifter cam, roller rockers, ported GM oval port 781 heads, 2.190/1.880 valves, Performer RPM air gap intake, 1 inch open spacer, Moroso oil pan.


Both engines will be tested with the same Holley carb, 2 inch headers with mufflers, which one will make more power?
__________________ </div></div>

Mark, you and I both know better. We have talked a few times and not sure if these guys realize WHO is posting!! Motor 2 has a very unfair advantage as it was out together by <span style="font-weight: bold">one of the BEST oval port engine builders in North America</span>. I just wish you were close and not over that &quot;imaginary&quot; line called A BOARDER.

What you should have done is post motor 1 against Wilson 496? That would have opened some eyes on these guys.

John (or you would know me as NPS NOVA on our &quot;other&quot; site, lol)

[VintageMusclecar]

I know who he is and what he's capable of. (That's why I picked engine #2)

Mark builds some impressive stuff. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Another bad-fast build

Like I told him over on the Chevelle forum--if I owned my own dyno, you'd likely never get me away from the damned thing.

[Vortecpro]

Thanks for the nice comments guys! I made a big mistake on this engine #2, I used a Icon 988 piston on this build and its a disaster, heavy, 1/16 3/16 ring pack, you need two men and a boy to turn the thing over, I really screwed up. I used that piston to get me right at 10.5 compression, I hope I don't let you down on this one, its really got me worried, I test it Friday, I will let you know then, wish me luck.

[Mk IV Muscle]

Just run a step test or tweak the vapor pressure a little! LOL.

[EZ Nova]

Mark get up. It's Friday already, go hit the dyno. lol

John