434 18 degree heads..

[mike]

Did not know if you guys were interested but the 18 degree 434 that I had for sale on this board.. I got alot of help building it over the last few years(on this board).With tony(afr) flowing the heads and some help with assembly of the shortblock buy you guys.. dynoed at 808hp and 588tq..Well we put it in a car this weekend and with 4.88 gears and a powerglide trans and a 5000 covertor the car weight was 3265lbs. off the trailer went 6.01 @ 114mph were are hoping for it to go 5.90-5.85 @ 116 when done at this weight.. anyways thought I would let you guys know.. thanks forthe help.. Mike.

[JDW]

I think I remember that. Were those heads cnc'd by Ron's? Went around 350ish on the AFR bench?

[mike]

they were cnc by chapman.. the 14 degrees I had were cnc by rons.. the 18s were 350 cfm @700lift...

[JDW]

Thats right, I remember that. 808hp is pretty stout for 350cfm. What kind of compression, cam, and intake did you go with to hit those #'s. Thanks.

[mike]

compression was 15-1 the cam was .855intake .800exh 285-296@.050 with a113 LS.. the intake was a bowtie converted over to a dominator top...

[pro]

Who converted manifold to dominator top and how much it cost you.Thanks

[Mike]

Greg Davis.. He builds sheetmetal manifolds for john kassee and for The summit prostock car.. Cost a whole bunch(1200.00 for the conversion) but think it was probably worth 15-20 HP>> But now you can buy a edelbrock victor with a dom top 18 degree. Still need to port it but you would probably only have 800.00 with the price of the manifold much better that 1400.00 with the price of the manifold..

[pro]

What is GM part #??on int manifold you used on your motor.Thanks

[mike]

P/N 10185053 I will see If I have any pictures of it when it was finished.. It really was nice...Are you building a 18 degee motor???

[JDW]

Mike, did you happen to take a look at the Brodix 4500 intake before going with the converted GM intake.

[pro]

Mike thanks on info on manifold love to se pict of your manifold if you have.I am building 422-18* only i am afraid Edelbrock victor Glidden manifold is to big for my application i am not using nos.In Edelbrock catalog it states(Victor Glidden #2859 is for all out nitrous assisted drag race application it features int runner with a large cross section area of 3.2 sguare inches 5000 to 8500 rpm)

[Mike]

acutally I think that will work out fine.. Those motors need a really big intake to make big power.. If the glidden was out when I did mine. I would have bought it.. Oh. well.. I will try and find a pictue. for ya.. Mike.

[Jason G]

Mike,

At what RPM did the 808 HP occur?

I just dynoed my 18 degree 445 SBC (4.145 bore x 4.125" stroke - 9.325" deck block) and was A LOT surprised at how low of an RPM it peaked at.

672HP @ 6300 RPM / 616 lb-ft @ 5200-5500 RPM.

The two things that I know are holding it back considerably is the heads, which are extensively ported Brodix 18X's, and the cam. The heads go 351 cfm @ .700 lift on R-Ms SF600 bench, but they only have a 2.66 sq. in. CSA at the pushrod pinch. The cam is 282/286, .708/.708, 108 LSA. It needs more exhaust duration, more lift, and a wider LSA, but I'm a little limited by the valve length and P-V clearance right now.

[mike]

Made peak HP @7700rpm and peak tq@6300. I think you LC is a little tight.. maybe 112 or even 114 would pick up were peak was made alittle bit.. My head CSA were 2.71@ the pushrod pinch. They only flowed 350 @ 700 lift. And I think they were alittle small..

[Jason G]

Thanks Mike!

I've got another cam in the works that will have a wider LSA. It looks like I may have been having some valve control issues as well.

What valve springs and installed height are you running? I would assume 1.625" diameter?

Thanks,

Jason