[mikes78]

Hi Guys, would like some HP/TQ estimates before I hit the dyno. Heres whats being built below. This is going to be a milder, lower rpm deal meant for street/strip fun in a heavy car with a big tire. What do you guys think?

511 BBC 4.25 stroke x 4.375 bore
Scat 4340 crank internal balance, probe srs 18cc dome pistons 1/16 ring pack
10.2 compression
OLD World Merlin Iron 320 rectangle port heads, 2.3 in x 1.9 ex valve
Brodix hv2000 intake
Pro-systems 1000hp 4150 carb
Custom solid roller, 232in x 245ex @.050, .638in x .618ex on a 107 LSA (Thanks Chris Straub!)

 

[afrohman]

680 hp 650 tq should be fun:hurray:

 

[NP 67]

737 hp 687 tq. Chris's nails these big block combo's

Good luck. It will be tunes of fun for sure.

 

[blasttime]

570 - 580 Hp. Good luck

 

[nastynate]

620hp 610ft lbs

 

[1968 hot rod]

620 corrected

 

[mikes78]

Thanks guys. Im not too sure these old heads perform good enough to show some of those bigger numbers like the newer afr or brodix stuff could, so I'm thinking if I see 575-600 I'd be a happy camper. Hope i'm wrong and it goes higher but I still think 575 would be a nice number for a low rpm deal. I hope the torque curve will be nice and flat too!

 

[CoolBlueGlow]

116 HP... at IDLE!

 

[supershift67]

585 hp. good luck

 

[mikes78]

Ok guys, any other guesses or revised estimates? Anyone want to pick peak tq and hp rpm? This is going on the dyno Wednesday morning and I will post results Wednesday night!

 

[72BBMonte]

Ok guys, any other guesses or revised estimates? Anyone want to pick peak tq and hp rpm? This is going on the dyno this Wednesday morning. I will post results Wednesday night!

588hp/613tq Just a guess

 

[mikes78]

Re: Another dyno guess post! 511 BBC ** RESULTS**

As promised, the results of the dyno session. Tried a 1" 4 hole and a open 1" spacer, you will see the on the top left of the sheet which one was which. AFR's were low 13's but didn't print on the sheets. Total timing was 36 degrees and jetting was 88/96. If anyone see's anything funny, let me know. Thanks for the estimates guys!

 

[cstraub]

Mike,
Thanks for everything. Just a note to the board, Mike's customer turns this engine in his drag car a max of 5500 rpm. I promised Mike max power around 5400 to 5600 rpm.

Almost 650HP all below 6000 rpm!

 

[blasttime]

Those Merlin heads work better than I thought.... congratulations now go Xerox some ETs

 

[mikes78]

Oh by the way, this thing idles @ 15" vacuum too! Thanks very much to Chris, Scott and Jordan. They helped me a TON! Customer cant wait to get this installed in his car for some street/strip action.

 

[540Hotrod]

Killer! Great job to the Team!

JIM

 

[69-CHVL]

Very nice build congrates guys.

 

[JBoggs]

I feel sorry for his tires. Lots of TQ down low.

 

[71454Chevelle]

Re: Another dyno guess post! 511 BBC ** RESULTS**

As promised, the results of the dyno session. Tried a 1" 4 hole and a open 1" spacer, you will see the on the top left of the sheet which one was which. AFR's were low 13's but didn't print on the sheets. Total timing was 36 degrees and jetting was 88/96. If anyone see's anything funny, let me know. Thanks for the estimates guys!

Mike,

Was the 4 hole spacer a tapered type or or a standard 4 hole with the same diameter all the way thru?